LG Ref LRSPC2661xx Service Manual

2013-04-09

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REFRIGERATOR
SERVICE MANUAL
CAUTION
PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS BOOK
BEFORE SERVICING OR OPERATING THE REFRIGERATOR.

Ref. No.
GR-D267DTU

MODEL: LRSPC2661T

COLOR: TITANIUM

CONTENTS
WARNINGS AND PRECAUTIONS FOR SAFETY ................................................................................................................ 3
SPECIFICATIONS................................................................................................................................................................... 4
PARTS IDENTIFICATION ....................................................................................................................................................... 5
HOW TO INSTALL THE REFRIGERATOR ............................................................................................................................ 6
HOW TO ADJUST DOOR HEIGHT OF THE REFRIGERATOR .......................................................................................... 6
HOW TO INSTALL WATER PIPE......................................................................................................................................... 7
HOW TO CONTROL THE AMOUNT OF WATER SUPPLIED TO THE ICEMAKER ........................................................... 8
COOLING CYCLE AND REFRIGERANT............................................................................................................................. 10
FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS....................................................................................... 12
COMPRESSOR (RECIPROCATING TYPE) ...................................................................................................................... 12
OVER LOAD PROTECTOR ............................................................................................................................................... 12
POSITIVE TEMPERATURE COEFFICIENT (PTC)............................................................................................................ 12
SWITCH (DOOR, HOME BAR, DISPENSER) ................................................................................................................... 13
MOTOR .............................................................................................................................................................................. 14
SOLENOID ......................................................................................................................................................................... 14
HEATER ............................................................................................................................................................................. 15
VALVE................................................................................................................................................................................. 17
ICEMAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD........................................................... 18
MICOM FUNCTION .............................................................................................................................................................. 24
EXPLANATION FOR MICOM CIRCUIT .............................................................................................................................. 32
CIRCUIT ................................................................................................................................................................................ 52
PROBLEM DIAGNOSIS ....................................................................................................................................................... 53
PROBLEM SHOOTING...................................................................................................................................................... 53
FAULTS .............................................................................................................................................................................. 63
COOLING CYCLE HEAVY REPAIR ................................................................................................................................... 80
HOW TO DEAL WITH CLAIMS .......................................................................................................................................... 87
HOW TO DISASSEMBLE AND ASSEMBLE(REFRIGERATOR SECTION) ....................................................................... 92
DOOR................................................................................................................................................................................. 92
HANDLE ............................................................................................................................................................................. 93
DEODORIZER.................................................................................................................................................................... 93
SHROUD, GRILLE FAN ..................................................................................................................................................... 94
CONTROL BOX, R............................................................................................................................................................. 94
CASE PWB......................................................................................................................................................................... 94
ICEMAKER ASSEMBLY..................................................................................................................................................... 95
DISPENSER....................................................................................................................................................................... 96
WATER TANK AND WATER LINE...................................................................................................................................... 97
DIGITAL SECTION LAYOUT ................................................................................................................................................ 98
DIGITAL PARTS MANUAL................................................................................................................................................. 101
TROUBLESHOOTING FOR THE DIGITAL FUNCTION SECTION ................................................................................... 122
EXTERNAL EXTENSION PORT ........................................................................................................................................ 131
HOW TO DISASSEMBLE AND ASSEMBLE(DIGITAL SECTION) ................................................................................. 132
EXPLODED VIEW .............................................................................................................................................................. 136
DIGITAL SECTION COMPONENTS .................................................................................................................................. 144
REPLACEMENT PARTS LIST .......................................................................................................................................... 146

-2-

WARNINGS AND PRECAUTIONS FOR SAFETY
8. Do not fray, damage, machine, heavily bend, yank, or
twist the power cord.

Please observe the following safety precautions in order to
safely and properly use the refrigerator, to avoid hazards,
and prevent accidents during repair.

9. Check for evidence of moisture intrusion in the
electrical components. Replace the parts or mask them
with insulation tape if moisture intrusion is evident.

1. Avoid the risk of electric shock. Disconnect power cord
from wall outlet and wait for more than three minutes
before replacing PWB parts. Shut off the power
whenever replacing and repairing electric components.

10. Do not touch the Icemaker with hands or tools to
confirm the operation of geared motor.

2. When connecting power cord, make sure that the power
cord has been disconnected from the wall outlet for at
least five minutes.

11. Do not let the customer repair, disassemble, or
reconstruct the refrigerator for themselves. Servicing
carries the risk of electric shock, fire and other hazards.

3. Check for damage to the power cord and plug. If the
power cord or plug is damaged, it could cause a fire or
electric shock.

12. Do not store hazardous materials such as ether,
benzene, alcohol, chemicals, gas, or medicine in the
refrigerator.

4. The refrigerator should have its own individual electrical
outlet. Overloading any outlet can cause a fire.

13. Do not put flower vases, cups, cosmetics, chemicals,
etc., or container with fall of liquid on the top of the
refrigerator.

5. Please make sure the outlet is properly grounded,
particularly in a wet or damp area.

14. Do not put glass bottles full of liquid into the freezer.
The contents could freeze and break the glass bottles.

6. Use standard electrical components when replacing
parts.

15. When scrapping the refrigerator, please disconnect the
door gasket first, and scrap the refrigerator in a location
where no children have access.

7. Make sure water connection is correctly engaged.
Remove dust and foreign materials from the housing
and connecting parts.

-3-

SPECIFICATIONS
ITEMS

SPECIFICATIONS

DIMENSIONS

ITEMS

SPECIFICATIONS

960(W)X915(D)X1795(H) mm

FIRST DEFROST

5 - 6 Hours

(377/8X361/4X702/3 in.)

DEFROST CYCLE

13 - 15 Hours

NET WEIGHT

169kg (3721/2 lbs.)

DEFROSTING DEVICE

Heater, Sheath-AL

COOLING SYSTEM

Fan Cooling

Heater, Sheath-ML

TEMPERATURE CONTROL

Micom Control

Heater, Drain

DEFROSTING SYSTEM

Full Automatic

ANTI SWEAT HEATER

Dispenser Duct Door Heater

Heater Defrost

Dispenser Heater

INSULATION

Cyclo-Pentane

Frame LCD Heater

COMPRESSOR

PTC Starting Type

EVAPORATOR

Fin Tube Type

Damper Heater

CONDENSER

Wire Condenser

Tube Inject Heater

REFRIGERANT

R134a (210g) (67/8 oz.)

FREEZER LAMP

60W (1 EA)

LUBRICATING OIL

FREOL @15G (330 cc)

REFRIGERATOR LOWER LAMP

60W (1 EA)

DRIER

1Ø0.83

REFRIGERATOR UPPER LAMP

30W (2 EA)

CAPILLARY TUBE

MOLECULAR SIEVE XH-7

DISPENSER LAMP

15W (1 EA)

ANTI-FREEZING HEATER

Chilled Room Duct Heater

750 (299/16)
801 (319/16)
875 (341/2)
915 (361/4)
1407 (557/16)

1795 (7011/16)

1750 (6815/16)

1790 (701/2)

1072 (201/4)
960 (3713/16)

-4-

PARTS IDENTIFICATION
Reset Switch
Management Switch

Frame
Display

Screen ON/OFF Switch

Remote Control
Receiver

Cover PWB

Back
Handle

Camera
Mic
Dispenser
Lamp
Monitor
Ice & Water
Dispenser
Button

Control Box, R
Dairy Product Corner
Icemaker

Cover, Lamp-R(U)
Cantilever Shelf

Bank Ice
Wine Rack
Egg Box

Cover, Lamp -F

Snack Corner
Slide Out
Cantilever Shelf

Shelf F

Cover
Guide Bottle
Cover, Lamp-R(L)
Drawer

Fruit/Vegetable
Drawer
Vegetable/Chilled
Drawer

Supporter
Basket

Guide Bottle
Cover Lower

Supporter Basket

Adjust Screw
(Ieft)

Adjust Screw
(right)
Vegetable/Chilled Drawer
Convertible Switch
Optional Part

-5-

HOW TO INSTALL REFRIGERATOR
1. How to Adjust Door Height of Refrigerator
■ Make the refrigerator level first. (If the refrigerator is not installed on a level floor, the height of freezer and refrigerator
door may not be the same.)
1. If the height of freezer door is lower than the
refrigerator door:

Height
Difference

2. If the height of freezer door is higher than the
refrigerator door:

Height
Difference

1 Adjusting
Screw
2 Driver

Insert a driver into the groove of adjusting screw
and rotate driver in arrow direction (clockwise) until the
refrigerator becomes horizontal.

-6-

HOW TO INSTALL REFRIGERATOR
2. How to Install Water Pipe
■ Install Water Filter (Applicable to some models only)
■ Before Installing water filter
1. Before installing the filter, take out the top shelf of the
refrigerator after tilting it to the direction () and lifting it
to the direction () and move it to the lower part.
2. Remove the lamp cover by pressing the protrusion
under the cover and pulling the cover to the front.

Control box

Aligning with the guide line
and the fastening indication line

Control box

Aligning with the guide line
and the loosening indication line

■ After installing water filter
Reassemble the lamp cover and the top shelf of the
refrigerator. To place the top shelf of the refrigerator, raise
the front part of the shelf a bit so that the hook of the shelf
fits into the groove.
In order to clean the water filter system, drain water for
about 3 min.

■ Installing water filter
1. Initial installation of water filter
Remove the filter substitute cap by turning it
counterclockwise () by 90 degrees and pulling it down.

Note : Then open the door of the refrigerator and check for
water dripping on the shelf under the filter.

Note : Keep it for later use when you do not use the filter.
Remove the red cap from the filter and attach the
sticker. Insert the upper part of the filter () after
aligning with the guideline marked on the control box,
and fasten it by turning it clockwise by 90 degrees.
Note : Verify that the guideline and the fastening indication
line are aligned.
2. Replacement of water filter

Substitute
cap
Removal
of red cap
Adhesive
Sticker

While holding the lower part of the filter, turn it
counterclockwise () by 90 degrees and pull it down.
Note : Verify that the guideline and the loosening indication
line are aligned.

-7-

HOW TO INSTALL REFRIGERATOR
3. How to Control the Amount of Water Supplied to Icemaker.
3-1. Verify the amount of water supplied to the Icemaker.
1. Pull out the ice bin in the upper part of the freezer compartment.
Caution : • Do not put hands or tools into the chute to
confirm the operation of geared motor.
(Doing so may damage refrigerator or cause
injury to hands.)
• Check the operation of motor by its
operation noise.

2. Apply electricity after connecting water pipe.
1) Press test switch under the Icemaker for two seconds as shown below.
2) The bell rings(ding~dong), ice tray rotates, and water comes out from the Icemaker water tube.
3) The water shall be supplied two or three times into the tray. The amount of water supplied for each time is small.
Put a water container under the ice tray and press test switch.
4) When ice tray rotates, the water in it will spill. Collect the spilled water and throw it into the sink.
5) When ice tray has finished rotation, water comes out from the water tube. Confirm the amounts of water in the ice tray.
(Refer to fig. The optimum amount of water is 110cc[6.7in3])

Confirm the amount
of water

Icemaker

Test Switch
Too much
Optimum level
Too small

* It is acceptable if the adjusted level of water is a bit smaller than optimum level.

-8-

HOW TO INSTALL REFRIGERATOR
Caution : When adjusting the amount of water supplied,
adjust in small increments. Otherwise the water
may spill over.

3-2. Control the amount of water supplied to the
Icemaker.
Caution : • Unplug the power cord from the wall outlet and
wait for more than three minutes before
disconnecting PWB cover as 310V is applied in
the control panel.
1. Disconnect PWB cover from the upper part of the
refrigerator.
(+) Driver

Switch ON

Switch OFF

PWB(PCB) Assembly

3. When adjustment of control switch for the amount of
water supplied is complete, check the level of water in
the ice tray.

Confirm the amount
of water

2. Adjust the amount of water supplied by using the DIP
switch.
■ Water Supplying Time Control Option
SWITCH NO

Water Suppling

Switch1

Switch2

Switch3

Time

OFF

6 Sec.

OFF

4 Sec.

OFF

4.5 Sec.

OFF

5 Sec.

OFF

5.5 Sec.

OFF

7 Sec.

OFF

8 Sec.

9 Sec.

Optimum level

1) The water supplying time is set at five seconds when the
refrigerator is delivered.
2) The amount of water supplied depends on the setting
time and the local water pressure.
3) If the ice cubes are too small, increase the water
supplying time. This happens when too little water is
supplied to the tray. (eg: change 5 to 5.5 seconds)
4) If ice cubes stick together, decrease the water supplying
time. This happens when too much water is supplied
into the ice tray. (eg: change 5 to 4.5 seconds)

-9-

COOLING CYCLE AND REFRIGERANT
1. Cooling Cycle (Cooling Principles/Refrigerant Gas Circulation)
1-1. Principles of cooling cycle
Cooling is an operation by which the temperature of a unit is maintained below the ambient temperature. For the
cooling operation, there must be an insulated space, the refrigerant (R134a) to absorb heat in the space, and a
refrigerant circulation system including a compressor, condenser, evaporator, etc. to conduct phase transformation of
the refrigerant.

1-2. Refrigerant gas circulation
Compressor
Wire Condenser
Hot Line (Freezer Compartment)
Hot Line (Refrigerator Compartment)
Drier
Capillary Tube

Evaporator
Suction Pipe
Cooling Fan

3
7
8

5
6
1

1-3. Cool Air Circulation
Freezer Compartment

Refrigerator Compartment

- 10 -

COOLING CYCLE AND REFRIGERANT
2. Description of each component
NO.

NAME

FUNCTION

REFRIGERANT (IN AND OUTLET)

COMPRESSOR

Compresses refrigerant from low(0 kg/cm2) to
high pressure(8-12 kg/cm2)

LOW PRESSURE
GAS(0 kg/cm2)
TEMP(30°C[86°F])

→ HIGH PRESSURE
GAS(8-12 kg/cm2)
TEMP(80[176°F]120°C[248°F])

CONDENSER

Refrigerant transforms from high pressure gas
to high pressure liquid in condenser.
This phase transfromation dissipates heat.

HIGH PRESSURE
GAS(8-12 kg/cm2)
TEMP(80[176°F]120°C[248°F])

→ HIGH PRESSURE
LIQUID(8-12 kg/cm2)
TEMP(40[104°F]60°C[140°F])

DRIER

CAPILLARY
TUBE

EVAPORATOR

LOW PRESSURE
→ LOW PRESSURE
Refrigerant transforms from low pressure liquid
GAS(0 kg/cm2)
to low pressure gas. This phase change absorbs LIQUID(0 kg/cm2)
TEMP(-27°C[-17°F])
heat from the surrounding air and food. This
enables foods to freeze in the freezer and to
stay fresh in the refrigerator compartment.

SUCTION PIPE

Connects evaporator and compressor.

Drier absorbs moisture in the system.
(moisture absorption equipment)
Long and narrow tubes. Refrigerant pressure
drops rapidly as refrigerant passes through the
tube.

HIGH PRESSURE → LOW PRESSURE
LIQUID(8-12 kg/cm2)
LIQUID(10 kg/cm2)
TEMP(40[104°F]TEMP(-27°C[-17°F])
60°C[140°F])

→ LOW PRESSURE
LOW PRESSURE
GAS(0 kg/cm2)
GAS(0 kg/cm2)
TEMP(-27°C[-17°F])
TEMP(30°C[86°F])

NOTE : • The pressure of refrigerant changes from high to low at capillary tube outlet. The low pressure refrigerant rushes
into the evaporator inlet and makes noise.
• When low pressure liquid refrigerant evaporates in the evaporator, evaporation takes place in the entire
evaporator from inlet to outlet. When this occurs, noise may sometimes occur. Noise depends on the amount of
evaporation so that noise may or may not occur. This is not a problem.

3. Containing refrigerant and foaming agent
Refrigerant

Characteristics

ODP

GWP

Remarks

Cyclo-Pentane
(C5H10)

It does not contain chlorine which depletes ozone layer.
Its GWP is almost zero. Pollution-free foaming agent.

Foaming Agent

R134a
(HFC-134a)

It does not contain chlorine which depletes ozone layer.
Its GWP is also very low compared with that of R12
(GWP:15,300).

1200

Refrigerant

* ODP: Ozone Depletion Index(relative value based on CFC11 as 1.0)
GWP: Globe Warmth Index(relative value based on CO2 as 1.0)

- 11 -

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS
1. Compressor(Reciprocating Type)
Piston

Motor
Spring
Iubricant

The compressor consists of a piston and motor. The motor
pushes piston and piston which compresses refrigerant
gas to a high pressure. Lubricants are sealed in the
compressor to a accelerate cooling and lubricate
compressor. Low pressure refrigerant is distributed through
the entire compressor but high pressure refrigerant gathers
around outer cooling plate through the outlet pipe.
NOTE : • A replacement compressor for service is full of
nitrogen gas and sealed with rubber when it is
delivered. This is to protect oxidation and to prevent
the intrusion of moisture into the compressor. When
bushing seals are removed, nitrogen gas shall rush
out, producing noise. This is normal. If the nitrogen
gas was leaked out. the compressor may be
corroded and should not be used.
• Compressor should be protected from impact
during transportation or storage to prevent
eccentricity of motor axis.

2. Over Load Protector

NOTE : • Over load protector relay detects temperature
and current at the same time. It operates when
the temperature of compressor is high even there
is no current. It shall also operates when over
current flows even the temperature of
compressor is low. It is also possible that both
high temperature and over current shall operate
relays at the same time.(Current is more effective
than temperature.)
• Over load protector relay shall operate again if
the surface temperature and current of
compressor repeats a breach of the threshold
values even though the heater is cools down
after 3 or 5 minutes of downtime. Customer may
claim that the relays repeated on and off
operation as the temperature remained constant.
In this case, switch off the power and let the
compressor cool down fully. If the relay
malfunctions after this, replace it with a new one.

3. Positive Temperature Coefficient (PTC)
Starter is connected to auxiliary winding in series and
accelerates compressor starting. It is located on outer case
of compressor with relays. Previously, the starter was a
contact point type. but it is now generally a PTC element
type. PTC stands for positive temperature coefficient and it
has a starting value of resistance(e.g. 22 Ω). It is an
element whose resistance becomes infinitive when current
flows. The starting principles of a single-phase induction
motor and simple alternating current circuit must be fully
understood in order to understand the roles of starter. The
circuit is shown below.

Over load protector relay protects motor by breaking
circuits when temperature rises and excess current flows in
the compressor. It consists of bimetal element and heater.
Bimetal element defroms when temperature rises and
heater emits heat when over current flows. This relay is
mounted on the outer surface of compressor and senses
temperature of compressor. This relay is connected to the
compressor motor in series. When operating contact point
of bimetal comes off from fixed contacting point, over load
protector relay breaks circuit. When the temperature of
compressor lowers and the heater cools, the operating
contact points move back to the fixed contact point and the
compressor works again after 3 or 5 minutes.

P.T.C

AC
CS

- 12 -

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS
4. Switch(Door, Dispenser)
1. Function
1) Door switches in freezer and refrigerator compartments turns on and off the lamps when the freezer and refrigerator
doors are opened and closed. They also switch the fans in the freezer compartment on and off at the same time.
2) Home bar switch turns on and off the lamp in the refrigerator compartment when home bar is open and close.
3) Dispenser switch turns the dispenser lamp on and off when dispensing ice/water.

2. Operation Principles and Characteristics
Classification

Door Switch

Shapes

Dispenser Switch

4
3
2
1

Circuits

Operation
Principles
/Charact
-eristics

- The switch points make contact depending on
wheather one of the doors is opened or closed.
These control the lamps in the refrigerator and
the freezer compartments.

- The dispenser bushing button is pressed by the
switch lever. This turns on the dispenser lamp.

3. Troubleshooting
Troubles (Parts)
Bad Contact

Symptoms

Check

Measures

Lamp is not on when door is
open. (door switch)

Operate switch button three or
four times and verify that the
lamp is on and off. See if lamp is
burnt out. If lamp is O.K, then
remove switch and measure the
resistance between terminals.
(Door Switch: 1-2, 3-4.)

Replace switch if the resistance
between terminals is not zero.

1. Dispenser lamp is not on
when bushing button is
pressed.

Operate switch button three and
four times and confirm the lamp,
ice and water dispenser work. It
they do not work, then remove
switch and measure the
resistance between terminals.
(COM-NO)

Replace switch if the resistance
between terminals is zero.

2. Ice and water are not
dispensed.

- 13 -

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS
5. Motor

6. Solenoid.

1. Freezer/Cooling Motor Used mainly for
Freezer/Cooling motor

1. Structure of Solenoid

Shaft

Stator

Two types of solenoids are used for refrigerator depending
on the applications such as solenoids for ice cube and ice
dispenser. The solenoid is composed of an armature,
stator and a main body which supports stator and pulls the
armature when electricity is applied.

2. Operation Principles
When electricity is applied to the coil, magnetic field forms
around the coil. The armature in the magnetic field moves
toward the stator and ice dispenses. When electricity is
removed, the armature moves back to its original position
(rated stroke distance) by the spring force and stops
moving.

Connector
■ Detail of connector

Front(SHAFT Projective direction)

Stator

Stator
Coil

GND(-)

Coil

15Vdc(+)
Armature

EMF

Armature

2) Gear Box Application Type
Gear box is used for moving and crushing ice which is
stored in the ice bin. Gear box is connected at the output
axis of shaded motor. Gear box changes high RPM of
motor to low RPM but high power by gear box. This power
can move and crush ice.

CAUTIONS : • Do not operate solenoid for more than two
minutes. It may be overheat.
• Solenoid is not for continuous use but
discontinuous use as it operates when
customer dispenses ice.

Stator
Gear Box

Shaft
Bobbin

- 14 -

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS
3. Troubleshooting
Symptom

Faults(parts)

Check

Crushed ice comes out when 1. Connector is missed.
ice cube is selected.

1. Check connection parts.

Measures
1. Join connector.

2. Solenoid for ice cube is cut. 2. Check resistance between 2. Replace parts.
terminals. The resistance is
infinite when it is cut.

Ice does not dispense but

1. Connector is disconnected. 1. Check connecting part.

1. Join connector.

jams on the door path

2. Solenoid for dispenser is

2. Replace parts.

when ice is selected.

2. Check the resistance

cut.

between terminals.
Resistance is infinite
when it is cut.

7. Heater
1. Summary
Heaters are used to remove dew and frost on the evaporator and ice and dew on the parts of refrigerator.
* SXS Refrigerator Defrost System
It is MICOM controlled automatic defrost system.
Heater turns on when the set time in MICOM has elapsed and off when the defrost sensor senses the defrost is complete.

2. Types of heater and their roles
Classification

Application

Functions

Resistance Remarks

Heater, Sheath-AL

Evaporator Upper Part

Evaporator Defrost

240W

Heater, Sheath-ML

Evaporator Lower Part

Evaporator Defrost

260W

It melts and discharges the ice dropped
Heater, Plate

Drain Lower Part

from the evaporator through drain pipe

45W

during defrost.
Heater, Plate

Chilled Room Duct

Prevent icing from the chilled room duct.

Heater, Plate

Damper

Prevent icing from damper

Heater, Plate

Dispenser(Freezer door)

Remove dew from dispenser

Heater, Sheet

Dispenser(Freezer door)

Remove dew from duct door.

Heater, Cord

Frame LCD

Prevent icing from Home Bar.

2.7W

Heater, Plate

Tube Inject

Prevent icing Tube Inject

3.5W

- 15 -

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS
3. Faults Symptom (Products): faulty heater
1) Heater, Sheath-ML/AL
Problem

Symptom

Checks

1. Heater, Sheath heating

Poor Defrost

1. The resistance is infinity when it is

wire is cut, corroded, or

measured at both connector ends

connecting wire is cut.

with a tester.
2. Visually check for a faulty defrost

2. Evaporator is not close

with eyes.

enough to Heater,

Measures
1. Replace parts. (Reconnect if
wire is disconnected.)
2. Move evaporator closer to
Heater, Sheath-AL.
3. Correctly insert connector.

3. The resistance fluctuates very much

Sheath-AL.

when the resistance is measured at

3. Poor terminal contact.

both ends with a tester.
4. Moisture intrudes into

Short circuit

4. When the resistance between both

the pipe through the

connector ends is measured with a

crack as Heater,

tester, the resistance is zero or

Sheath-AL Pipe, and/or

beyond the allowance of marked

Silicon Cap are dented.

value. (allowance: marked value±7%)

4. Replace parts.

2) Heater Plate (Drain)
Problem
1. Heating wire is cut or
corroded.

Symptom

Checks

Poor defrost

1. The resistance is infinity when the
resistance is measured at both
connector ends with a tester.
2. The resistance fluctuates very
much when the resistance is
measured at both connector ends
with a tester.

1. Replace parts. (Reconnect if
wire is cut)

3. When the resistance between both
connector ends is measured with a
tester, the resistance is zero or
beyond the allowance of marked
value. (allowance: marked
value±7%)

3. Replace parts.

2. Poor terminal contact.

3. Moisture intrudes as
the heating wire is
damaged by a sharp fin
of evaporator.

Short circuit

- 16 -

Measures

2. Correctly reinsert the connector.

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS
3) Other Heaters
Problem
1. Heating wire is
cut or corroded.
2. Poor terminal

Corresponding
Heater

Symptom

Heater Plate

The temperature of chilled

(Chilled drawer

drawer is high.

duct)

(icing on duct)

Checks

Measures

1. The resistance is infinite when the

1. Replace parts.

resistance is measured at both

(Reconnect if the wire

connector ends with a tester.

contact.

is cut)

2. The resistance significantly very much

2. Correctly insert

when the resistance is measured at both

connector.

connector ends with a tester.
Heater Plate

Incorrect refrigerator

(damper)

compartment temperature.
(icing on the duct)

Heater Plate

Dew forms around the

(dispenser)

dispenser

Sheath Heater

Dew forms around duct door. 1. The resistance is infinite when it is

(duct door)

1. Remove connector from freezer hinge
and measure the resistance of heater.

measured at both connector
ends with a tester.

Cord Heater

Dew forms around

(Frame LCD)

Frame LCD.

1. Remove connector from R hinge and
measure the resistance of heater.

8. Valve
1. Nomenclature of each part
Solenoid Coil
Spring
Plunger
Packing
Holder
Flow Control

Flow Washer

Inlet

2. Operation Principles
1) While Opening
When power is on and the inlet water pressure reaches
at a certain value, the plunger (3) moves up by solenoid
coil. The water passes through porous hole and then
center holes of the holder and flows to the outlet. Flow
control (6) and flow washer (7) are included in order to
maintain a constant flow rate and pressure (1.0 ~
8.0 kgf/cm2) in A line (water supplied to icemaker).

1
4

2) While Closing
The water stops flowing to outlet as packing seals (4)
the hole of holder (5) by spring when power is off.

6
7

5
B Outlet

- 17 -

ICEMAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD
1. Working Principles
1-1. Icemaker Working Principles
Power Input

Initial Control

• Level Icemaker Cube Mould for Initial Control
after power is applied.

Ice Making Control

• Wait until the water in the cube mould is frozen
after Icemaker starts operation.

Ice Ejection Control

• Detect if ice bin is full of ice by rotating ice ejection
motor in normal and reverse direction and eject ice into
the ice bin if ice bin is not full.

Water Supply Control

• Conduct Ice Making Control after supplying water into the Icemaker
cube mould by operating water valve.

Test Control

• This is for refrigerator assembly line and service. When ice making test switch is pressed,
it operates in the following steps: initial ice ejection water supply control steps.

1-2. Dispenser Working Principles
1. This function is available in Model GR-D267 where water and ice are available without opening freezer compartment door.
2. Crushed Ice is automatically selected when power is initially applied or reapplied after power cut.
3. When dispenser selection switch is continuously pressed, light is on in the following sequence:
Water → Cube Ice → Crushed Ice.
4. Lamp is on when dispenser bushing button is pressed and vice versa.
5. When dispenser crushed ice bushing button is pressed, dispenser solenoid and geared motor work so that crushed ice
can be dispensed if there is ice in the ice bin.
6. When dispenser cube ice bushing button is pressed, dispenser solenoid, cube ice solenoid and geared motor work so
that cubed ice can be dispensed if there is ice in the ice bin.
7. When dispenser water bushing button is pressed, water valve opens and water is supplied if water valve is properly
installed on the right side of the machine room.
8. Ice and water are not available when freezer door is open.

- 18 -

ICEMAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD
2. Function of Icemaker
2-1. Initial Control Function
1. When power is initially applied or reapplied after power loss, the Icemaker cube mould level is detected after completion
of MICOM initialization. The detecting lever moves up and down.
2. The level of Icemaker cube mould is determined by output signal, high and low signal, of Hall IC. The cube mould is
leveled by rotating ice ejection motor in normal or reverse direction. The High/Low Hall signal is be applied to MICOM Pin
No. 42.
3. If there is no change in signals one minute after the geared motor starts to operate, it stops Icemaker operation and
checks the signal every hour. It reinitializes the Icemaker when the feedback signals becomes normal.
4. It datermines that the initialization is completed when it senses the Icemaker cube mould is horizontal.
5. Ice ejection conducts for 1 cycle whether ice or not ice is in the ice bin when power is initially applied.

2-2. Water Supply Control Function
1. This function supplies water into the Icemaker cube mould by operating the water valve when ice ejection control is
completed and Icemaker mould is level.
2. The quantity of water supplied is determined by DIP switches and water pressure.

DIP SWITCH SETTING
SWITCH 1
SWITCH 2
SWITCH 3

WATER SUPPLY TIME

OFF

6.5 Sec.

OFF

5.5 Sec.

OFF

6 Sec.

OFF

7 Sec.

OFF

7.5 Sec.

OFF

8 Sec.

OFF

9 Sec.

10 Sec.

REMARKS

* The quantity of water supplied
depends on DIP switch setting
conditions and water pressure as it is
a direct tap water connection type.
(the water supplied is generally 80 cc
to 120 cc)
* DIP switches are on the main PWB.

3. The refrigerator actively detects the DIP switch seting so that interrupting power is not necessary to change the supply
preset. If the DIP switches are changed while water is being supplied, the changes will take effect until the supply cycle is
complets.
4. When water supply signal is applied to water and ice valves at the same time during water supply, water is supplied to
water valve. If water supply signal is applied to ice valve during water supply, water is supplied to both water and ice
valves.

2-3. Ice Making Control Function
1. Ice making control is carried out from the completion of water supply to the completion of ice making in the cube mould.
Ice making sensor detects the temperature of cube mould and completes ice making. (ice making sensor is fixed below
Icemaker cube mould)
2. Ice making control starts after completion of water supply control or initial control.
3. Ice making is determined to be completed when ice making sensor temperature reaches at -8°C[18°F] 100 minutes after
water is supplied to Icemaker cube mould.
4. It is judged that ice making is completed when Icemaker sensor temperature reaches below -12°C[10°F] after 20 minutes
in condition 3.

- 19 -

ICEMAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD
2-4. Ice Ejection Control Function
1. This function ejects the ice from the Icemaker cube mould after ice making is completed.
2. If Hall IC signal is on within 3.6 seconds after ice ejection motor rotates in normal direction, it does not proceed with ice
ejection. but waits. If the ice bin is full, ice ejection motor rotates in normal direction in every hour to check the condition of
ice bin. If the ice bin is not full, the water supply control starts after completion of ice ejection control. If the ice bin is full,
ice ejection motor rotates in reverse direction and stops ice making.
3. If ice bin is not full, ice ejection starts. The cube mould tilts to the maximum and ice is separated from the mould as ice
checking lever raises.
4. Ice ejection motor stops for 1 second if Hall IC signal changes from OFF (low) to ON (high) after 3.6 seconds when ice
ejection motor has rotated in normal direction. If there is no change in Hall IC signals within 1 minute after ice ejection
motor operates, ice ejection motor stops as ice ejection motor or Hall IC is out of order.
5. If ice ejection motor or Hall IC is abnormal, ice ejection motor rotates in normal direction to perform its reinitialization. It
resets the Icemaker if the ice ejection motor or Hall IC is normal.
6. The mould stops for 1 second at maximum tilted conditions.
7. The mould returns to a leveled position as ice ejection motor rotates in reverse direction.
8. When the mould is level, the cycle starts to repeat:
Water Supply → Ice Making → Ice Ejection → Mould Returns to Horizontal
Maximum tilting
point
Bank is
not full
HALL IC
OUTPUT
SIGNALS
Bank is
full
HALL IC
OUTPUT
SIGNALS
ICE CHECKING LEVEL 30°
ICE CHECKING
AXIS
Lock

Ice making
Ice Checking
(Original point)
2±1 sec

Ice Ejection

9±3 sec

Horizontal
Conditions

8±3 sec

- 20 -

Lock

Level Retrun
Conditions

ICEMAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD
2-5 Test Function
1. This function forces operation during operation servicing and cleaning. The test switch is mounted under the automatic
Icemaker. The test function starts when the test switch is pressed for more than 0.5 second.
2. Test button does not work during ice ejection and water supply. It works when the tray is in the horizontal conditions. If the
mould is full of ice during test function operation, ice ejection control and water supply control will not work.
3. When the test switch is pressed for more than 0.5 second in the horizontal condition, ice ejection starts irrespect of the
mould conditions. Water will splash if test switch is pressed before the water in the mould freezes. Water shall be supplied
while the mould returns to the horizontal conditions after ice ejection. Problems involving ice ejection, returning to the
horizontal conditions, and water supply can be checked via the test switch. When test function performs normally, a
buzzer sounds and the water supply function begins. Check it for repair if buzzer does not sound.
4. When water supply function is completed, the cycle continues as follows: Ice making → Ice ejection → Returning to
horizontal conditions → Water supply
5. Remove ice from the Icemaker cube mould and press test switch. When Icemaker cube mould is full of ice as ice ejection
and water supply controls do not operate.

2-6. Other functions relating to freezer compartment door opening
1. When freezer door is open, ice dispenser stops in order to reduce noise and ice drop.
2. When freezer door is open during ice ejection and cube mould returning to horizontal condition, ice ejection and cube
mould level return proceed.
3. When freezer door is open, geared motor and cube ice solenoid immediately stop and duct door solenoid stops after 5
seconds.
4. Water dispenser stops in order to prevent water spilling when freezer door is open.
5. Test function operates normally regardless of refrigearator compartment door opening.

- 21 -

ICEMAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD
3. Icemaker Troubleshooting
* Troubleshooting: it is possible to check the dispenser by pressing freezer and refrigerator temperature control buttons
for more than 1 second. (Icemaker is normal if all leds are on): refer to trouble diagnposis function in
MICOM section.

Is DC Power (5V and 12V)
output normal?

Failed DC Power

Change main PWB

• Check DC power (5V, 12V).

Yes

Is cube ice LCD off during
troubleshooting check?

Yes

Failed Icemaker unit test switch

Replace Icemaker Unit

Replace Main PWB

Replace Icemaker Unit

• Are both ends (5,6) of CON9
test switch open?
• Defects between test switch
and board (Pin No. 38 of IC1).
• Are both ends (3,4) of CON9
ice maker stop switch short?

Yes

Is water suppy normal
after Ice ejection and level return
by ice ejection motor?

Failed Icemaker Unit
• Is the resistance of both ends
(9,10) of ice ejection motor of
CON9 between 18 and 22Ω?
• Is ice ejection motor drive circuit
(IC11 and peripheral circuits)
normal?
• Defects between Hall IC and
Board (Pin No. 42 of IC1).
• Confirm ice ejection and level
return when pressing
test switch.

Are ice
ejection and level return
normal when test switch is
pressed for more than 0.5 second?
Does the bell
sound once?

Replace Ice making
Sensor

• Check the resistance of
both ends (1,2) of icemaking
sensor of CON9.
• Defects between icemaking
sensor and board
(Pin No. 60 of IC1)

Is Crushed Ice LCD off during
troubleshooting check?

Failed icemaking sensor

Poor water supply
• Is power applied to water
supply valve?
• Does the water supply
valve work normally?
• Is the water supply line
normally connected?

Normal

- 22 -

Replace water
supply valve

ICEMAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD
4. Icemaker circuit part

The Icemaker circuit above applies to the GR-D267 and consists of the Icemaker unit part installed in the freezing section
and the Icemaker drive part of the main PWB.
Water supply to the Icemaker container is accomplished by opening the valve via a solenoid relay for a duration set by the
DIP switches. When water supply time elapsed, water supply automatically stops. This circuit exists for implementing
functions such as ice removal, ice-full detection, horizontal balancing and sense of ice-making temperature sensing for the
Icemaker container. Ice-making temperature sensing is same as in the temperature sense circuit part of the main PWB,
refer to it.
Test switch input detection of the Icemaker is same as in the door switch input detection circuit of the main PWB.
1. This function is used in operation test, service execution and cleaning, etc. And is performed if pressing the test switch
installed at the automatic Icemaker itself for more than 0.5 seconds.
2. The test switch operates when the ice-maker is in the horizontal position. Test function is not available during the water
supply operation. Ice removal control and water supply controls are not performed if ice-full is detected during the
operation of test function.
3. If pressing the test switch for 0.5 second or more in the horizontal status, ice removal operation is immediately performed
regardless of the generation conditions of ice in the ice-making tray. Therefore, exercise caution as water may overflow
when operating test function before the water has frozen. The water supply function operates with the horizontal
balancing operation after ice removal operation. Therefore, you can check any problem of ice removal operation,
horizontal operation and water supply. In this case, if test check returns normal feedback, a bell sound rings and water
supply control is performed. No ringing of the bell sound means failure and repair service must be performed.
4. When water supply is completed, operation continues in the normal cycle of ice making, ice removal, returning to
horizontal status, and water supply.

- 23 -

MICOM FUNCTION
1. Monitor Panel

FILTER RESET
PUSH 3 SEC.

WATER
TEMP
ON

CUBED

TEMP

FILTER STATUS

6
5
4
3
2
1

OFF

CRUSHED
L

ROOM TEMP
LOCK

UNLOCK

2. Description of Function
2-1. Funnction of Temperature Selection
Division

Setting
temperature

Temperature
Control
Freezer Control
Refrigeration
Control

Power Initially On

1st Press

2st Press

3th Press

4th Press

Medium

Medium Max

Max

Min

Medium Min

-19 °C [-2 °F]

-22 °C [-7 °F]

-23 °C [-9 °F]

-15 °C [5 °F]

-17 °C [1 °F]

3 °C [37 °F]

2 °C [35 °F]

0°C [32 °F]

6 °C [43 °F]

4 °C [39 °F]

* The temperature can vary ±3 °C depending on the load condition.

❉ Whenever pressing button, setting cycles in the order of (Medium) ➝ (Medium Max) ➝ (Max) ➝ (Min) ➝
(Medium Min).
• The actual inner temperature varies depending on the food status, as the indicated setting temperature is a target
temperature, not the actual temperature within refrigerator.
• Refrigeration appears to be weak at first use. Please adjust temperature as shown after using refrigerator for minimum
of 2 to 3 days.

- 24 -

MICOM FUNCTION
2-2. LCD Back Light Control
1. In order to easily view display status on the LCD, LCD Back Light turns on for a minute in application of initial power, for a
minute with button use, and for a minute after closing the door.
2. If pressing any display button once with the backlight turned off, buzzer rings and button function is not performed but
only backlight is turned on (If pressing the first button with the back light turned off, only back light ON function is
performed).
3. When pressing the special freezing button and the freezing temperature adjustment button for more than a second, the
back light is turns on and all the graphics of LCD are turned on. If releasing the button, the LCD graphic returns to in the
previous state and the back light turns off (check LCD graphic and back light ON/OFF status).

2-3. Outside temperature display function
1. The temperature sensor at the left U of refrigerator senses ambient temperature and displays that temperature in the left
side of Outside temperature text on the LCD display.
2. Ambient temperature is displayed up to -9°C[16°F] ~ 49°C[120°F] and displayed as Lo for less than -10°C[14°F] and as
HI for more than 50°C[122°F]. If the ambient temperature sensor fails, Er is displayed.
3. Since display temperature of ambient temperature is temperature sensed by the ambient sensor in the hinge U of the
freezing compartment, it may differ from the ambient temperature display of other household electrical appliances.

2-4. Lock function (display button lock)
1. When power is first applied, only the Release text is turned on in the lock/release status indicator at the right side of the
LCD display.
2. If desiring to lock the display status, press the lock/release button once, Release text is turns off at the right side of lock
graphic of LCD and Lock text is turned on indicating locked status.
3. The only buzzer sound rings and function is not performed even if pressing display button other than lock/release key
when in the lock status.
4. If desiring to release the lock status, press the lock/release button once, Lock text turns off at the right side of lock
graphic of LCD and Release text turns on in dicating locked release status.

2-5. Filter status display function
1. Remaining filter replacement period is displayed as in the below figure. Each line in dicates the number of months before
the next filter replacement.
FILTER RESET
PUSH 3 SEC.
2. The graphic/text indicator
appears if in the LCD if 6 months of filter use have passed.
3. Reset the filter status by pressing the filter replace button for more than 3 seconds to after replacing filters when 6 months
of filter use have transpired or merely if desiring to reset the filter display status.
Classification

In initial
use

1 Month
use

2 Months
use

3 Months
use

4 Months
use

5 Months
use

6 Months
use
FILTER RESET
PUSH 3 SEC.

FILTER STATUS

Filter Status
Display

6
5
4
3
2
1

FILTER STATUS
6
5
4
3
2
1

FILTER STATUS

6
5
4
3
2
1

FILTER STATUS
6
5
4
3
2
1

2-6. Automatic Icemaker
• The automatic Icemaker can automatically make 8 pieces of ice at a time up to 10 times a day, These quentities may vary
according to various conditions in cluding how many times the refrigerator door opens and closes.
• Ice making stops when the ice storage bin is full.
• If you don’t want to use automatic Icemaker, switch the Icemaker OFF.
If you want to use automatic Icemaker later, switch it ON.
NOTE : It is normal that a noise is produced when ice made is dropped into the ice storage bin.

- 25 -

MICOM FUNCTION
2-7. When Icemaker does not operate smoothly
Ice is frozen together
• When ice is frozen together, take the lumps out of the ice storage bin, break them into small pieces, and then place them
into the ice storage bin again.
• When the Icemaker produces ice too small or frozen ice, the amount of water supplied to the Icemaker needs to adjusted.
Contact the service center.
✻ If ice is not used frequently, it may freeze together.
Power failure
• Ice may drop into the freezer compartment. Take the ice storage bin out and discard all the ice. Then dry it and place it
back in its position. After the machine is powered again, crushed ice will be automatically selected.
The unit is newly installed
• It takes about 12 hours for a newly installed refrigerator to make ice in the freezer compartment.

2-8. Super freezer
Please select this function for prompt freezing.
• On or Off cycles whenever pressing SUPER FRZ button.
• The graphic indicator remains in the On status after flickering 4 times when selecting Special Refrigeration On.
• Super freezer function automatically turns off after a fixed time passes.

2-9. Lock
This button prevents use of a different button.
• At initial Power on, the control panel is unlocked.
• Lock or Release cycles whenever pressing the LOCK CONTROL.
• Pressing another button while the panel is locked will yield no results.

2-10. Super freezing
1. Super freezing is a function to improve cooling speed of the freezing chamber by consecutively operating compressors
and freezing room fan. Pressing the super freezing button toggles the Super Freezer feature on and off when the feature
turns on the
graphic remains on after blinking once.
2. Super freezing is cycles in order of Selection/ Release (Turn On / Turn Off) whenever pressing the selection button.
3. Super freezing is released if power failure occurs and the re frigerator then returns to the original status.
4. Temperature setting is not changed even if selecting the super freezing option is selected.
5. A change of the temperature setting of the freezing chamber or the cold storage chamber is permitted with super freezing
selected. The change is processed while Super Freeze is active.
6. The cold storage chamber operates in the state currently set with super freezing selected and processed.
7. Note that the super freezing, the super freezing function deactivates after continuously operating compressor and the
freezing room fan for a certain amount of time.
8. If frost removal starting time occurs during super freezing, super freezing operation executes only for the remaining time
after completion of frost removal when the super freezing operation time passes 90 minutes. If passing 90 minutes, super
freezing operation is carried out only for 2 hours after completion of frost removal.
9. If pressing the super freezing button during frost removal, the super freezing LCD indicator turns on but if pressing the
super freezing, compressor operates only after the remaining defrost time has passed.
10. If selecting super freezing within 7 minutes (delay for 7 minutes of compressor) after the compressor stops, compressor
operates after the remaining time has passed.
11. The freezing room fan motor operates at high RPM during operation of super freezing.

- 26 -

MICOM FUNCTION
2-11. Control of variable speed freezing room fan
1. To increase cooling speed and load response speed, the MICOM sets freezing room fan motor at the high speed of RPM
or the standard RPM.
2. Only at the application of initial power, or special freezing operation, or load response operation does the MICOM direct
speed of RPM. The MICOM directs the standard RPM in other general operations.
3. If opening doors of freezing / cold storage chamber or home bar while fan motor in the freezing chamber operates, the
freezing chamber fan motor operates normally. (If operating in the high speed of RPM, it switches to the standard RPM).
However, if opening doors of freezing chamber or home bar, the freezing room fan motor stops.
4. As for monitoring of BLDC fan motor error in the freezing chamber, MICOM immediately stops the fan motor when
sensing that the BLDC fan motor is locked or pooly operating if there would be position signal for more than 65 seconds
at the BLDC motor. In such cases, the MICOM in dicutes a failure (refer to failure diagnosis function table) on the LCD
display and attempts arestant of the cycle in 30 minutes. If normal operation is detected, failure status is released and
refrigerator resets to the initial status (reset).

2-12. Control of cooling chamber fan motor
1. The cooling chamber fan motor performs ON/OFF control by linking with the COMP.
2. It operates at the single RPM without varying RPM.
3. Failure sensing method is same as freezing fan motor (refer to failure diagnosis function table for failure display).

2-13. Door opening alarm
1. Buzzer generates alarm sound if doors are not closed even when more than a minute consecutively has passed with
doors of freezing / cold storage chamber or home bar opened.
2. Buzzer rings three times in the interval of 0.5 seconds after the first one-minute has passed after doors are opened and
then repeats three times of On/Off alarm in the cycle of every 30 seconds.
3. If the doors of freezing/cold storage chamber or home bar are closed during door open alarm, alarm is immediately
deactivated.

Doors of
freezing/cold
storage Closing Opening Closing
chamber or
home bar

Opening

Closing
3 Times 3 Times 3 Times 3 Times

BUZZER
Within
a minute

A minute

30
30
30
seconds seconds seconds

2-14. Ringing of button selection buzzer
1. If pressing the front display button, a bell sound rings.

2-15. Ringing of forced operation, forced frost removal buzzer
1. If you press the test button on the Main PCB, a tone sounds.
2. In selecting forced operation, alarm Sound is repeated and completed in the cycle of On for 0.2 second and Off for 1.8
second three times.
3. In selecting forced frost removal, alarm sound is repeated and completed in the cycle of On for 0.2 second , Off for 0.2
second, On for 0.2 second and Off for 1.4 second three times.

- 27 -

MICOM FUNCTION
2-16. Frost removal function
1. Frost removal is performed every 7 to 7.5 hours of accumulated compressor operation time.
2. After providing initial power (or after power failure), frost removal starts whenever total operation time of compressor
becomes 4 to 4.5 hours.
3. Frost removal is completed if temperature of the frost removal sensor becomes more than 5°C[41°F] after starting frost
removal. Poor frost removal is not displaced if it does not arrive at 5°C[41°F] even if two hours have passed after starting
frost removal.
4. No removal is done if frost removal sensor fails (snapping or short-circuit).

2-17. Electric Equipment Progressive Operation
Compressor, defrost heater, freezer fan, cooling fan, electromagnetic single motor damper, etc. start in the following
sequence in order to prevent noise and parts damage when power is first applied and when testing is complete.
Function

When electricity is first applied

When the
temperature of
defrost sensor is
above 45°C[113°F]
(when purchased
or moved to
another house)
When the
temperature of
defrost sensor is
below 45°C[113°F]
(during power loss
and servicing)

Load Starting Sequence

1/2

POWER sec
ON

COMP

1/4
1/4
FAN
sec (High Speed) sec

DAMPER
HEATER
ON

TEST MODE

Test Mode 2
(Forced Defrost)

1/4 HOME
MOTOR sec
BAR
DAMPER
HEATER
ON
ON

If there is an error in
the process, startup
does not work.
■ Load starting
sequence when
freezer and
refrigerator doors
are closed.

1/2
10
1/4
5
HOME
HOME
POWER sec DEFROST sec DEFROST sec
sec
BAR
BAR
HEATER
HEATER
HEATER
HEATER
ON
ON
OFF
ON
OFF

1/4 VEGETABLE 5 VEGETABLE 1/4
sec HEATER sec HEATER sec

Test Mode 1
(Forced Starting)

Remarks

DAMPER
HEATER
OFF

TEST
S/W
(Press
Once)

OTHER
LOAD
OFF

TEST
S/W
(Press
Twice)

COMP
OFF

COMP

20
sec

1/4
sec

COMP

FAN

1/4
sec

FAN
(High Speed)
ON

FAN

1/4
1/4
sec DEFROST sec

OFF

- 28 -

HEATER
ON

MOTOR
DAMPER
ON

If switch is once
more pressed or the
temperature of
defrost sensor is
above +5°C[41°F] in
test mode 2, it
returns to test mode
and starts initial
drive. (compressor
will start after seven
minutes)

MICOM FUNCTION
2-18. Failure Diagnosis Function
1. Failure diagnosis function is a function to facilitate servicing when improper operation of the product occurs.
2. The user will notice a failure when pressing one of the function buttons yields no consequent effect beyond the audible
Ding.
3. If the improper operation ceases while a failure is displayed, the MICOM resets the display to a normal state.
4. A failure code is indicated on the LCD displays refrigerator and freezer temperature readouts temperature for the freezing
room and the display part of setting temperature for the cold storage room of LCD, which are placed at the display part of
a refrigerator. All the LCD graphics other than a failure code are turned off.

WATER

TEMP
CUBED

TEMP

FILTER STATUS

6
5
4
3
2
1

OFF

CRUSHED
L

ROOM TEMP

UNLOCK

● : Normal Operation
Product operation status in failure

Failure code display part
No.

Item

Setting
Setting
Symptoms of failure
temperature temperature for
for freezing cold storage
Snapping or short-circuit of
Er
FS
Failure of freezer
freezer sensor
sensor

Compressor

Freezer
Fan

ON for 15minutes Standard
OFF for 15minutes
RPM

M/C room
Fan

Defrost
Heater

Stepping
motor damper

●

Snapping or short-circuit of
refrigerator sensor 1

●

Standard
RPM

●

Open for 10munutes,
closing for 15 minutes

Snapping or short-circuit of
refrigerator sensor 2

●

Standard
RPM

●

Snapping or short-circuit of frost
removal sensor

●

Standard
RPM

●

No frost
removal

●

Snapping of frost removal heater
or temperature fuse, pull-out of
connector (indicated minimum 4
hours after failure occurs)

●

Standard
RPM

●

Failure of BLDC FAN
at freezing section

●

OFF (check every
30 minutes)

●

Failure of BLDC FAN
at machine section

Poor motor, connection of wires
to fan. Contact of structures to
Fan. Snapping or short-circuit of
L/wire (if there is no fan motor
signal for more than 60 seconds
in operation of fan motor

●

Standard OFF (check
every 30 minutes)
RPM

●

Failure of
Communication

Connection between main PCB
and display PCB. Snapping or
short-circuit of L/wire.
Transmission between main PCB
and display PCB. Poor TR and
receiving part.

●

Standard
RPM

●

Abnormal
electronic single
motor Damper

Faulty damper motor. Lead wire of
damper lead switch in out or shortcircuited. Interference of foreign
materials in damper baffle or EPS.

●

Check
operation
every hour

Failure of
Outside Sensor

Setting temperature
display (Note 1)

Snapping or short-circuit of outside
temperature perceiving sensor

●

Failure of ice
removal sensor

Setting temperature
display (Note 2)

Snapping or short-circuit of icemaking sensor

●

Failure of
Icemaker unit

Setting temperature
display (Note 2)

Poor motor or Hall IC within ice-maker
unit. Snapping or short-circuit of
L/Wire. Poor main PCB drive circuit.

●

Failure of refrigerator
sensor 1

Failure of refrigerator
sensor 2

Failure of frost
removal sensor

Poor of frost
removal

Setting temperature
display (Note 2)

✽ In display of the failure mode, all LCDs of setting temperature for freezing/ setting temperature and for cold storage are
turned off (excluding Note1 and Note2).

- 29 -

MICOM FUNCTION
Note1) In failure of outside sensor, the temperature setting for freezing/ cold storage displays normally and indicated Er is
indicated on the outside temperature display part (normally displayed except for the outside temperature display
part).
Note2) Improper operation of R2 sensor, Icemaker-sensor and Icemaker kit are displayed in LCD check, but not indicated
on the failure display part. To check these items, press freezing temperature adjustment button and special freezing
button for a second or more.
Cold storage sensor 2
(middle partition)

Normal : (C) Part LCD graphic- ON
Abnormal: Only (C) Part LCD graphic-OFF

Icemaker sensor

Normal: (D) Part LCD graphic-ON
Abnormal: Only (D) Part LCD graphic-ON

Icemaker Unit

Normal: (E) Part LCD graphic-ON
Abnormal : Only (E) Part LCD graphic-ON

Other LCD graphics - ON

2-19. Test Function
1. The purpose of the test function is to check function of the PWB and product and to search for the failed part when the
product is in a failure status.
2. Test button is located on the main PCB of refrigerator (test switch), and the test mode will finish after a maximum of 2
hours irrespective of test mode and then is before restting to the normal operation.
3. Function adjustment buttons do not function during test mode but only warning sound rings.
4. Upon test mode completion, always pull the power cord out and then plug-in it again to reset to normal operation.
5. If misoperations contents such as sensor failure are found during performance of test mode, release the test mode and
note the failure code.
6. If pressing the test button is pressed during a failure code display, test mode will not be activated.
Mode

Manipulation

Content

Test 1

Press TEST switch once

1. Continuous operation of compressor
2. Continuous operation of freezing chamber
fan (high speed RPM) and M/C chamber fan
3. Frost removal heater OFF
4. Full opening status (baffle opened) status of
electronic step motor damper
5. All display LCD graphics - ON.

Test 2

Press TEST switch once at
TEST1 condition

1. Compressor OFF
2. Freezing chamber fan and M/C chamber
fans are turned off.
3. Frost removal heater ON
4. Full closing status (baffle closed) status of
electronic step motor damper
5. All display LCD graphics - OFF
( (A) Medium status. (B) Medium status.
Only LCD is turned on)

Normal
condition

Press TEST switch once at
TEST2 condition

Return to the initial status.

- 30 -

Remarks
Freezing room fan is
turned off in door open.

Compressor is operates
after 7 minutes.

MICOM FUNCTION
✻ LCD check function: If simultaneously pressing special freezing button and cold temperature adjustment button for a
second, a back light is turns on and all display LCD graphics turn on. On releasing the button, the
LCD graphic displays the previous status, and the back light is turns off (LCD graphic and back light
ON/OFF check).

FILTER RESET
PUSH 3 SEC.

WATER
TEMP
ON

CUBED

TEMP

FILTER STATUS

H
M

OFF

CRUSHED
L

6
5
4
3
2
1

ROOM TEMP
LOCK

UNLOCK

H
M
L

2-20. Function of built-in ice dispenser and water dispenser built-in
1. This function allows dispensing of ice and water to come outside without opening door.
2. If pressing the dispenser switch (bushing button) after selecting ice (cubed or crushed) or water, ice or water equivalent to
each come out accordingly. However, the duct doors are opened by an electrical solenoid valve (Duct Door Solenoid) if
when pressing the dispenser switch for ICE selection. After pressing the dispenser press switch and releasing it, the duct
door closes after it is opened for 5 seconds.
3. Dispensing ice and water stops if freezing chamber door is opened.
4. If there is no Off signal even when 3 minutes have passed while pressing the dispenser press switch after selecting ice
(cubed or crushed) or water, geared motor and solenoid (Cube, Water) is automatically turned off. However, the solenoid
(duct door) stops 5 seconds after Off (to prevent short-circuiting of a coil due to overheating of solenoid).
5. Dispenser Lamp On/Off function
Lamp on the dispenser part is turned on when pressing the dispenser press switch after selecting ice (cubed or crushed)
or water. The lamp turns off after releasing the dispenser switch.
6. Selection function of crushed ice / water / cubed ice
1) This is function allows selection of crushed ice water, cubed ice function depending on user’s selection. Display and
selection is changed by pressing the dispenser selection button.
2) At initial Power On, crushed ice is automatically selected.
3) In selecting crushed ice, geared motor operates so that crushed ice can be supplied outside by pressing the dispenser
switch when ice is formed in the ice storage container (Ice Bin).
4) In selecting crushed ice, geared motor is operates so that cube ice can be supplied outside if pressing the dispenser
switch when ice is present in the ice storage container (Ice Bin).
7. Water dispenser function
1) LCD is displays water selection if user chooses water via the selection control.
2) Water dispenser function is a type directly connected to a water pipe. The water solenoid valve built-in at the right side
of the Cooling chamber opens to supply water when the dispenser switch is pressed.

- 31 -

EXPLANATION FOR MICOM CIRCUIT
1. Explanation of PWB circuit
1-1. Power circuit
Power circuit consists of SMPS (SWITCHING MODE POWER SUPPLY) power. The SMPS consist of the rectifying part
(BD1, CE1) converting AC voltage to DC voltage, the switching part (IC2) switching the converted DC voltage, transformer
transferring energy of the primary side of the switching terminal to the secondary side and the feedback part (IC3, IC4)
transferring control information to the primary side.
Caution : Since high voltage (DC310V) is maintained at the power terminal, please take a measurements after more than 3
minutes have passed after removing power cords in the abnormal operating conditions.
Voltages of specific test locations are shown:

Part
Voltage

VA1
230 Vac

CE1
310 Vdc

CE2
16 Vdc

- 32 -

CE3
12 Vdc

CE4
15.5 Vdc

CE5
5 Vdc

EXPLANATION FOR MICOM CIRCUIT
1-2. Oscillation circuit
The oscillation circuit is a circuit with the purpose of generating basic time for clock occurrence for synchronization and time
calculation related to information transmission/reception of internal circuitry in IC1 (MICOM). The OSC1 must always use
rated parts since If SPEC is changed, time calculated at the IC1 may be changed, and internal operations may cease
entirely.

1-3. Reset circuit
The reset circuit is a circuit allowing various parts such as RAM inside of MICOM (IC1) to initialize and the whole of function
to start from the initial status, when initial power is input or when power is reapplied again to MICOM following a
spontaneous power loss. A LOW DC level is applied to the reset terminal of MICOM in the beginning of power supply for a
constant time (10ms).
Reset terminal during general operation is 5V (No MICOM operation occurs in failure of RESET IC).

- 33 -

EXPLANATION FOR MICOM CIRCUIT
1-4. Load/dispenser operation, door opening circuit
1. Load driving circuit
✽ Even if opening the door of freezing chamber or cold storage chamber during operation of fan motor at the freezing
chamber, this circuit does not stop and operates at the standard RPM. In addition, if doors of freezing chamber or cold
storage chamber, the fan motor normally operates at the RPM previously operated.
✽ (A), (B), (C) and (D) of door switch for the freezing chamber or freezer room are connected to the door open sensing
circuit in parallel toward both ends of switch to signal which door is open at MICOM.
✽ Since a door switch of the home bar is connected to door switch (C), (D) of the cold storage chamber. The circuit senses
door opening if either door is opened.
✽ The fan motor will immediately stop if opening doors of the freezing chamber or cold storage chamber during TEST mode
and it immediately restarts upon closing them.

Type of Load

Compressor

Frost
Removal
Heater

Measuring part (IC6)

No.16

No.15

Status

AC
Converting
Relay
No.14

Refrigerator
LAMP
No.13

Within 1 V

OFF

12 V

Def-HEATER

F-Door
S/W

S/W

- 34 -

Damper
Heater
Control Box
Heater

Pipe Heater

No.14 (IC7) No.15 (IC7)

No.11 (IC7)

AC
Motor
Damper

EXPLANATION FOR MICOM CIRCUIT
2. Dispenser operation circuit

1) Check load driving status

Type of Load

Measuring part
Status

GEARED
MOTOR

SOLENOID
CUBE

IC6-13

IC6-12

WATER VALVE
ICE

WATER

IC6-11

IC6-10

Within 1 V

OFF

12 V

SOLENOID
DISPENSER

HOME BAR
HEATER

SOLENOID
PILOT

IC7-12

IC7-10

IC7-16

2) Lever S/W sensing circuit
Measuring part

IC1(Micom) (No. 16)

Lever SWITCH
On(Press)

(60 Hz)

0V
OFF

- 35 -

EXPLANATION FOR MICOM CIRCUIT
3. Door opening sensing circuit

Measuring part
IC1 (MICOM) No. 47, 46 Pin
Door of Freezing/Cold Storage Room
Closing

5 V ( A - B , C - D . SWITCH at both ends are at Off status)

Opening

5 V ( A - B , C - D . SWITCH at both ends are at On status)

Since door switch sensing switch (A), (B) is a separate switch even if the door switch of the freezing room normally
operates, they may fail to sense door opening in the failure of switch at both ends of (A) and (B) or in failure of the L/wire.
Lamp in the cold storage chamber does not turn on if the MICOM of the cold storage chamber fails to sense the door open
switch (C), (D) or the home bar switch.

- 36 -

EXPLANATION FOR MICOM CIRCUIT
1-5. Temperature sensing circuit

F
The above circuits are circuits attached to freezing chamber sensor and cold storage room sensors for adjusting
temperature settings in the freezing chamber, and cold storage chamber, ice-maker sensor for sensing water temperature in
ice-making, or and to an evaporator for sensing temperature of frost removal operations. Short or open status checking of
every temperature sensor is as follows:
SENSOR

CHECK POINT

Freezing sensor

POINT A Voltage

Frost removal sensor

POINT B Voltage

Cold storage sensor 1

POINT C Voltage

Cold storage sensor 2

POINT D Voltage

Icemaking sensor

POINT E Voltage

Room temperature sensor

POINT F Voltage

- 37 -

NORMAL(-30 °C ~ 50 °C)
(-22 °F ~ 122 °F)

SHORTED

OPEN

0.5 V~4.5 V

EXPLANATION FOR MICOM CIRCUIT
1-6. Switch entry circuit
The following circuits are entry circuits for sensing signal form test Switch, and the electronic single motor damper reed
Switch for examining the refrigerator.

1-7. Option designation circuit (model separation function)

The above circuits are used for designating separation by model as option and notifying the MICOM. Designation of option
by model and the application standards are as follows:
u These circuits are accurately pre-adjusted in shipment from factory and so you must not alter the option.
Separation

Connection Status

Application Standard

Connected

Export model

CUT

Domestic model

OP1

- 38 -

EXPLANATION FOR MICOM CIRCUIT
1-8. Fan motor driving circuit (freezing chamber, M/C chamber)
1. This circuit performs function to make standby power ‘0’ by cutting off power supplied to ICs inside of the fan motor when
the fan motor is OFF.
2. This circuit performs a temporary change of speed for the fan motor and applies DC voltage ranging between 7.5V an
16V to the motor.
3. This circuit futher functions to stop the fan motor further by cutting off power applied to the fan motor as it senses the fan
motor’s RPM.
a , d part

b part

e part

c , f part

Motor OFF

2V or less

Motor ON

2 ~ 3V

12 ~ 14V

8 ~ 16V

a
e

CE7

- 39 -

EXPLANATION FOR MICOM CIRCUIT
1-9. Temperature compensation and temperature compensation circuit
1. Temperature compensation at freezing chamber, cold storage chamber

Temperature compensation at
Cold storage chamber
Temperature compensation at Freezing chamber

Freezing chamber

Cold storage chamber

Resistance value
(RCF1)

Temperature
compensation

Resistance value
(RCR1)

Temperature
compensation

Remarks

180 kΩ

+5 °C [+9°F]

180 kΩ

+2.5 °C [+4.5°F]

Warmer

56 kΩ

+4 °C [+7.2°F]

56 kΩ

+2.0 °C [+3.6°F]

compensation

33 kΩ

+3 °C [+5.4°F]

33 kΩ

+1.5 °C [+2.7°F]

18 kΩ

+2 °C [+3.6°F]

18 kΩ

+1.0 °C [+1.8°F]

12 kΩ

+1 °C [+1.8°F]

12 kΩ

+0.5 °C [+0.9°F]

10 kΩ

0 °C [0°F]

10 kΩ

0 °C [0°F]

8.2 kΩ

-1 °C [-1.8°F]

8.2 kΩ

-0.5 °C [-0.9°F]

5.6 kΩ

-2 °C [-3.6°F]

5.6 kΩ

-1.0 °C [-1.8°F]

3.3 kΩ

-3 °C [-5.4°F]

3.3 kΩ

-1.5 °C [-2.7°F]

2 kΩ

-4 °C [-7.2°F]

2 kΩ

-2.0 °C [3.6°F]

Cooler

470 Ω

-5 °C [-9°F]

470 Ω

-2.5 °C [-4.5°F]

compensation

Reference temperature

u Temperature compensation table by adjustment value (difference value against current temperature)
Ex) If changing compensation resistance at a cold storage room (RCR1) from 10 kΩ (current resistance) to 18 kΩ
(modified resistance), temperature at the cold storage will increase by +1°C [+1.8°F].

- 40 -

EXPLANATION FOR MICOM CIRCUIT
u Temperature compensation table at the cold storage room is as follows:
Modification
resistance
470 Ω
Current
resistance

2 kΩ

3.3 kΩ

5.6 kΩ

8.2 kΩ

10 kΩ

12 kΩ

18 kΩ

33 kΩ

56 kΩ

180 kΩ

470Ω

0.5 °C
1 °C
1.5 °C
2 °C 2.5 °C
3 °C
3.5 °C
4 °C
4.5 °C
[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F] [6.3 °F] [7.2 °F] [8.1 °F]
change
Up
Up
Up
Up
Up
Up
Up
Up
Up

2 kΩ

0.5 °C
No
0.5 °C
1 °C
1.5 °C 2 °C
2.5 °C
3 °C
3.5 °C
4 °C
4.5 °C
[0.9 °F]
[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F] [6.3 °F] [7.2 °F] [8.1 °F]
Down change
Up
Up
Up
Up
Up
Up
Up
Up
Up

1 °C
0.5 °C
No
3.3 kΩ [1.8 °F] [0.9 °F]
Down
Down
change
1.5 °C
1 °C
0.5 °C
5.6 kΩ [2.7 °F] [1.8 °F] [0.9 °F]
Down
Down
Down

0.5 °C
1 °C 1.5 °C
2 °C
2.5 °C
3 °C
3.5 °C
4 °C
[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F] [6.3 °F] [7.2 °F]
Up
Up
Up
Up
Up
Up
Up
Up
No

0.5 °C 1 °C
1.5 °C
2 °C
2.5 °C
3 °C
3.5 °C
[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F] [6.3 °F]
Up
Up
Up
Up
Up
Up
Up

change

2 °C
1.5 °C
1 °C
0.5 °
8.2 kΩ [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]
Down
Down
Down
Drop
Cold storage
chamber
10 kΩ
(RCR1)

5 °C
[9 °F]
Up

0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
3 °C
[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F]
change
Up
Up
Up
Up
Up
Up

2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
[4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]
[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F]
Down
Down
Down
Down
Down change
Up
Up
Up
Up
Up

12 kΩ

3 °C
2.5 °C
2 °C
1.5 °C
1 °C 0.5 °C
[5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]
Down
Down
Down
Down
Down
Down

18 kΩ

3.5 °C
3 °C
2.5 °C
2 °C
1.5 °C 1 °C
0.5 °C
No
0.5 °C
1 °C
1.5 °C
[6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]
[0.9 °F] [1.8 °F] [2.7 °F]
Down
Down
Down
Down
Down
Down
Down
change
Up
Up
Up

33 kΩ

4 °C
3.5 °C
3 °C
2.5 °C
2 °C 1.5 °C
1 °C
0.5 °C
[7.2 °F] [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]
Down
Down
Down
Down
Down
Down
Down
Down

56 kΩ

4.5 °C
4 °C
3.5 °C
3 °C
2.5 °C 2 °C
1.5 °C
1 °C
0.5 °C
[8.1 °F] [7.2 °F] [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]
Down
Down
Down
Down
Down
Down
Down
Down
Down

180 kΩ

5 °C
[9 °F]
Down

0.5 °C
1 °C
1.5 °C
2 °C
[0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F]
change
Up
Up
Up
Up

0.5 °C
1 °C
[0.9 °F] [1.8 °F]
change
Up
Up
No

0.5 °C
[0.9 °F]
change
Up

4.5 °C
4 °C
3.5 °C
3 °C 2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
[8.1 °F] [7.2 °F] [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]
Down
Down
Down
Down
Down
Down
Down
Down
Down

No
change

u Temperature compensation at the freezing chamber is also performed in the same manner as cold storage chamber.
Temperature compensation value is twice that of the cold storage chamber.
u This circuit determines the necessary level of temperature compensation for the MICOM to control temperature of each
chamber.

- 41 -

EXPLANATION FOR MICOM CIRCUIT
2. Compensation circuit for weak-cold, over-cold in freezing chamber

Thermal compensation by Jumper CUT

Compensation
for weak-cold
JCR3
JCR4

JCR1

+1 °C [+1.8 °F]

JCR2

+1 °C [+1.8 °F]

JCR3

-1 °C [-1.8 °F]

JCR4

-1 °C [-1.8 °F]

Compensation
for over-cold
JCR1
JCR2

+2 °C [+3.6 °F]
-2 °C [-3.6 °F]

Temperature compensation value
in cold storage chamber

Remarks

0 °C [32 °F] (In shipment from factory)
CUT

-1 °C [-1.8 °F]
CUT

+1 °C [+1.8 °F]
CUT

CUT

-2 °C [-3.6 °F]
CUT

CUT
CUT

CUT

+2 °C [+3.6 °F]
0 °C [0 °F]

CUT
CUT

CUT

+1 °C [+1.8 °F]

0 °C [0 °F]
0 °C [0 °F]

CUT

0 °C [0 °F]

CUT

-1 °C [-1.8 °F]

CUT

+1 °C [+1.8 °F]

CUT

0 °C [0 °F]

u The above option circuit allows compensation for temperature in the cold storage chamber by simply by cutting service
jumpers.

- 42 -

EXPLANATION FOR MICOM CIRCUIT
1-10. Communication circuit and connection L/Wire between main PCB and display PCB
The following circuit is a communication circuit used for exchanging the necessary information between main MICOM of
main PCB and LCD dedicated MICOM for LCD control of display PCB.
Transmission/receipt L/Wire is necessary display PCB for driving the display PCB is required.
Poor communication occurs if a continuous information exchange fail to continue for more than 30 seconds between main
MICOM of main PCB and LCD dedicated MICOM for LCD control of display PCB.

Main PCB

L/Wire FD/H(4-wires)

Display PCB

DC 12V
Main MICOM

LCD dedicated MICOM

GND

Transmission (error status)

12Vdc

Reception

Transmission

GND
Transmission

Reception

- 43 -

PCB ASSEMBLY DISPLAY

Reception (notch status)

EXPLANATION FOR MICOM CIRCUIT
2. Sensor resistance characteristics table
Cold storage sensor 1, 2.

Measuring Temperature (°C / °F)

Freezing Sensor

-20 °C [-4 °F]

22.3 kΩ

-15 °C [-5.0 °F]

16.9 kΩ

60 kΩ

-15 °C [-5.0 °F]

13.0 kΩ

47.3 kΩ

-5 °C [23.0 °F]

10.1 kΩ

38.4 kΩ

Frost removal sensor, Outside sensor
77 kΩ

0 °C [32 °F]

7.8 kΩ

30 kΩ

+5 °C [41 °F]

6.2 kΩ

24.1 kΩ

+10 °C [50 °F]

4.9 kΩ

19.5 kΩ

+15 °C [59 °F]

3.9 kΩ

15.9 kΩ

+20 °C [68 °F]

3.1 kΩ

13 kΩ

+25 °C [77 °F]

2.5 kΩ

11 kΩ

+30 °C [86 °F]

2.0 kΩ

8.9 kΩ

+40 °C [104 °F]

1.4 kΩ

6.2 kΩ

+50 °C [122 °F]

0.8 kΩ

4.3 kΩ

u Resistance value tolerance of sensor is ±5%.
u In measuring resistance value allowance of sensor, perform measurement after leaving the sensor for more than 3
minutes at the measuring temperature (delay is required due to sense speed relation relationship).
u Since an analog tester has a large measuring temperature, measuring with a digital tester is strongly recommended.
u Resistance of the cold storage sensor 1 and 2 shall be measured with a digital tester after separating CON8 of the PWB
ASSEMBLY and the MAIN part.
u Resistance of the freezing sensor shall be measured with a digital tester after separating CON7 of the PWB ASSEMBLY
and the MAIN part.

- 44 -

EXPLANATION FOR MICOM CIRCUIT
3. PWB parts diagram and list
3-1. PWB Assembly, main part diagram

- 45 -

EXPLANATION FOR MICOM CIRCUIT
3-2. Parts list

- 46 -

EXPLANATION FOR MICOM CIRCUIT

WATER SUPPLY S/W

- 47 -

EXPLANATION FOR MICOM CIRCUIT
3-3. DISPLAY ASSEMBLY part diagram

- 48 -

EXPLANATION FOR MICOM CIRCUIT
3-4. DISPLAY circuit diagram

- 49 -

EXPLANATION FOR MICOM CIRCUIT
4. PWB circuit diagram - PWB circuit diagram may vary a little bit depending on actual condition.

PWB ASSEMBLY, MAIN

- 50 -

4
2
3
1

- 51 -

PCB ASSEMBLY, DISPLAY

EXPLANATION FOR MICOM CIRCUIT

CIRCUIT
THE CIRCUIT DRAWINGS

- 52 -

PROBLEM DIAGNOSIS
1. Trouble Shooting
CLAIMS.
1. Faulty start

CAUSES AND CHECK POINTS.

HOW TO CHECK
* Measuring instrument :
Multi tester

1) No power on outlet.
2) No power on cord.
Bad connection between adapter and outlet. (faulty adapter)
The Inner diameter of adapter.
The distance between holes.
The distance between terminals.
The thickness of terminal.
Bad connection between plug and adapter (faulty plug).
The distance between pins.
Pin outer diameter.
3) Shorted start circuit.
No power on Disconnected copper wire.
power cord.

Power cord is disconnected.
Faulty soldering.

Internal electrical short.
Loose contact.
- Large distance between
male terminal.
- Thin female terminal.

Faulty terminal contact.

■ Check the voltage.
If the voltage is within ±85%
of the rated voltage, it is OK.
■ Check the terminal
movement.

■ Check both terminals of
power cord.
Power conducts : OK.
No power conducts : NG

Terminal disconnected.
Bad sleeve assembly.
Disconnected. - Weak connection.
- Short inserted cord length.
- Worn out tool blade.
No electric
power on
thermostat.

Thermostat is off.- Gas leaks completely. Sensor breakage.
Sealed part leak.
Bellows leak.
Faulty terminal connection.

OLP is off.

Capacity of OLP is small.
Characteristics of OLP are out of spec.
Bad connection.

■ Check both thermostat
terminals.
Power conducts : OK.
If not : NG.
■ Check both terminals of OLP.
If power conducts : OK.
If not : NG.

Power is
Inner Ni-Cr wire blows out.
disconnected. Bad internal connection.
Faulty terminal caulking (Cu wire is cut).
Bad soldering.

No electric power on compressor. - Faulty compressor.
Faulty PTC.

Power does not conduct. - Damage.
Bad characteristics. - Initial resistance is high.
Bad connection with Too loose.
compressor.
Assembly is not possible.
Bad terminal connection.

4) During defrost.

Start automatic defrost.
Cycle was set at defrost when the refrigerator
was produced.

- 53 -

■ Check the resistance of both
terminals.
At normal temperature 6 :
OK.
If disconnected : ∞.

PROBLEM DIAGNOSIS
CLAIMS.
2. No cooling.

CAUSES AND CHECK POINTS.
2) Refrigeration system is clogged.
Moisture
clogged.

Residual moisture
in the evaporator.

Air Blowing.

Not performed.
Too short.
Impossible moisture
confirmation.
Low air pressure.

Leave it in the air.
Caps are missed.

No electric
power on
thermostat.

HOW TO CHECK
■ Check the clogged
evaporator by heating (as
soon as the cracking sound
begins, the evaporator starts
freezing)

During rest time.
After work.

Residual moisture.

Not dried in the compressor.
Elapsed more than 6 months after drying
Caps are missing.
No pressure when it is open.

Insufficient drier
capacity.

Dry drier - Drier temperature.
Leave it in the air.

Check on package
condition.
Good storage after
finishing.

Residual moisture
in pipes.

Caps are missed.

During transportation.
During work.

Air blowing. Not performed.
Performed.
Too short time.
Low air pressure.
Less dry air.
Moisture penetration - Leave it in the air. - Moisture penetration.
into the refrigeration oil.
■ The evaporator does not cool
from the beginnig (no evidece
of moisture attached).
The evaporator is the same
as before even heat is
applied.

Short pipe insert.
Weld joint
clogged.

Pipe gaps.

Too large.
Damaged pipes.

Too much solder.
The capillary tube inserted too far.
Drier cloggeing.

Capillary tube melts. - Over heat.
Clogged with foreign materials.

Desiccant powder.
Weld oxides.
Drier angle.

Reduced cross section by cutting. - Squeezed.

Foreign material clogging.

Compressor cap is disconnected.
Foreign materials are in the pipe.

- 54 -

PROBLEM DIAGNOSIS
CLAIMS.
3. Refrigeration
is weak.

CAUSES AND CHECK POINTS.
1) Refrigerant Partly leaked.

Weld joint leak.
Parts leak.

2) Poor defrosting capacity.
Drain path (pipe) clogged.

HOW TO CHECK

■ Check visually.
Inject P/U into drain hose.

Foreign materials
penetration.

Inject through the
hole.
Seal with drain.

P/U lump input.
Screw input.
Other foreign materials
input.

Drain cap is not disconnected.
Defrost heater does not
generate heat.

Parts
disconnected.

- 55 -

Defrost
thermostat

Thermostat is cut.
- Bad caulking
connection.
- Base material
(Ammonia).
Terminal is corroded.
- Water penetration
Bad terminal contact.

Plate
heater

Wire is cut.
- Heating wire.
- Contact point
between heating
and electric wire.
Dent by fin evaporator.
Poor terminal contacts.

Cord
heater

Wire is cut.
- Lead wire.
- Heating wire.
- Contact point
between heating and
electric wire.
Heating wire is corroded
- Water penetration.
Bad terminal connection.

Melting
fuse

The fuse blows out.
Paraffin melted
- Welding flame.
Bad terminal contact.

■ Check terminal
Conduction: OK.
No conduction: NG.
If wire is not cut, refer to
resistance.
P=Power
V=Voltage
R=Resistance
V2
P= —
R
V2
R= —
P

PROBLEM DIAGNOSIS
CLAIMS.
3. Refrigeration
is weak.

CAUSES AND CHECK POINTS.
Residual
frost.

Weak heat from heater.

HOW TO CHECK

Sheath Heater - rated.
Heater plate - rated.
Heater cord-L - rated.

Bad heater assembly. Heater plate

No contact to drain.
Loosened stopper cord.

Heater cord-L Not contact to the
evaporator pipe.
Location of assembly
(top and middle).
Too short defrosting time.

Defrost Sensor.
- Faulty characteristics.
Seat-D(missing, location. thickness).

Structural fault.

Gasket gap.
Air inflow through the fan motor.
Bad insulation of case door.

No automatic defrosting.
Defrost does not return.

3) Cooling air leak.
Bad gasket adhestion

Door sag.

Gap.
Bad attachment.
Contraction.

Bad adhesion.
Weak binding force at hinge.

4) No cooling air circulation.
Faulty fan motor.

Fan motor.

Door switch.

Self locked.
Wire is cut.
Bad terminal contact.
Contact distance.
Button pressure.
Melted contact.
Contact.
Refrigerator and freezer switch reversed.
Button is not pressed. Poor door
attachment.
Door liner
(dimension).
Contraction inner
liner.
Misalignment.
Bad terminal
connection.
P/U liquid leak.
Faults.

- 56 -

■ Check the fan motor
conduction: OK.
No conduction: NG.

PROBLEM DIAGNOSIS
CLAIMS.
3. Refrigeration
is weak.

CAUSES AND CHECK POINTS.

HOW TO CHECK

4) No cooling air circulation.
Faulty fan motor.

Fan is
constrained.

Fan shroud contact. - Clearance.
Damping evaporator contact.
Accumulated residual frost.

Small cooling air
discharge.

Insufficient
motor RPM

Fan overload. - Fan misuse.
Bad low termperature RPM characteristics.
Rated power misuse.
Low voltage.

Faulty fan.

Shorud.

Fan misuse.
Bad shape.
Loose connection. - Not tightly connected.
Insert depth.
Bent.

Ice and foreign materials on rotating parts.

5) Compressor capacity.

Rating misuse.
Small capacity.
Low valtage.

6) Refrigerant
too much or too little.

Malfunction of charging cylinder.
Wrong setting of refrigerant.
Insufficient compressor. - Faulty compressor.

7) Continuous operation
- No contact of temperature controller. - Foreign materials.

8) Damper opens continuously.
Foreign materials
P/U liquid dump.
jammed.
EPS water sediment.
Screw.
Failed sensor. - Position of sensor.
Characteristics
Bad characteristics of its own temperatue.
of damper.
Parts misuse.
Charge of temperature - Impact.
characteristics.
9) Food storing place. - Near the outlet of cooling air.

- 57 -

■ Check visually after
disassembly.

PROBLEM DIAGNOSIS
CLAIMS.
4. Warm
refrigerator
compartment
temperature.

CAUSES AND CHECK POINTS.
1) Clogged cooling path.
P/U liquid leak.
Foreign materials. –– P/U dump liquid.
2) Food storate.

5. No automatic
operation.
(Faulty
contacts.)

Store hot food.
Store too much at once.
Door open.
Packages block air flow.

1) Faulty temperature sensor in freezer compartment.
Faulty contact.
Faulty temperature characteristics.
2) Refrigeration load is too much.

3) Poor insulation.
4) Unit is hot.

Food.

Too much food.
Hot food.
Frequent opening and closing.
Cool air leak.
Poor door close. – Partly opened.

High ambient temperature.
Space is not sufficiently ventilated.

5) Refrigerant leak.
6) Inadequate amount of refrigerant.
7) Weak compressor discharging power.

Different rating.
Small capacity.

8) Fan does not work.
9) Button is positioned at strong.

6. Condensation
and ice
formation.

HOW TO CHECK

1) Ice in freeezer compartment.
External air inflow. –– Bushing motor assembly direction (reverse).
Door opens
Weak door closing power.
but not closes.
Stopper malfunction.
Door sag.
Food hinders door closing.

Gap around gasket. –– Contraction, distortion, loose, door twisted, corner not
fully inserted.
Food vapor. –– Storing hot food. –– Unsealed food.
2) Condensation in the refrigerator compartment.
Insufficient closing.
Door opens
but doesn’t close.
Door sag.
Food hinders door closing.
Gasket gap.
3) Condensation on liner foam.
Cool air leak
Not fully filled.
and transmitted.

Toop table part.
Out plate R/L part.
Flange gap. –– Not sealed.
Gasket gap.

- 58 -

■ Inspect parts measurements
and check visually.

PROBLEM DIAGNOSIS
CLAIMS.
6. Condensation
and ice
formation.

CAUSES AND CHECK POINTS.

HOW TO CHECK

4) Dew on door.
Dew on the duct door. - Duct door heater is cut.
Dew on the dispense
Recess Heater is cut.
recess.
Duct door is open. / Foreign material clogging.
Dew on the
door surface.

Dew on the
gasket surface.

Not fully filled.

Surface.
Corner.
P/U liquid contraction.

Liquid shortage.
Liquid leak.

Bad wing adhesion.

Wing sag(lower part).
Door liner shape mismatch.
Corner.
Too much notch.
Broken.
Home Bar heater is cut.

5) Water on the floor.
Condensation in the refrigerator compartment.
Defrosted water overflows.
Clogged discharging hose.
Discharging hose
Evaporation tray located at wrong place.
location.
Tray drip.
Damaged.
Breaks, holes.
Small Capacity.
Position of drain.

7. Sounds

1) Compressor compartment operating sounds.
Compressor sound
Sound from machine itself.
Sound from vibration.
Restrainer.
Bushing
Too hard.
seat.
Distorted.
Aged.
Burnt.
Stopper. Bad Stopper Not fit
assembly.
(inner
diameter
of stopper).
Tilted.
Not inserted.
Compressor base not connected.
Bad welding compressor stand fallen.
Foreign materials in the compressor
compartment.
OLP sound.
Chattering sound.
Capacitor noise.
Insulation paper vibration.
Pipe contacts each other. – Narrow interval.
Pipe sound.
No vibration damper. Damping Bushing-Q.
Damping Bushing-S.
Capillary tube unattached.

- 59 -

PROBLEM DIAGNOSIS
CLAIMS.
7. Sounds

CAUSES AND CHECK POINTS.
1) Compressor compartment operating sounds.
Transformer sound.
Its own fault. –– Core gap.
Bad connection. –– Correct screw connection.
Drip tray vibration sound. Bad assembly.
Distortion.
Foreign materials inside.
Back cover machine sound.
Condenser drain sound.

Bad connection.
Partly damaged.
Not connected.
Bad pipe caulking.

2) Freezer compartment sounds.
Fan motor sound.
Normal operating sound.
Vibration sound.
Aged bushing seat.
Bad torque for assembling motor
bracket.
Sounds from fan
contact.

Fan guide contact.
Shroud burr contact.
Damping evaporator contact.
Residual frost contact.
Damaged heater cord.
Narrow evaporator interval.

Unbalance fan sounds.

Unbalance.

Surface machining conditions.
Fan distortion.
Misshappen.
Burr.

Ice on the fan. –– Air intake (opposite to motor
bushing assembly.)

Motor shaft
contact sounds.
Resonance.
Evaporator noise.

Supporter disorted.
Tilted during motor assembly.

Evaporator pipe contact. –– No damping evaporator.
Sound from refrigerant. –– Stainless steel pipe shape in
accumulator.
Sound from fin evaporator and pipe during expansion
and contraction.

3) Bowls and bottles make contact on top shelf.
4) Refrigerator roof contact.
5) Refrigerator side contact.
6) Insufficient lubricants on door hinge.

- 60 -

HOW TO CHECK

PROBLEM DIAGNOSIS
CLAIMS.
8. Faulty lamp
(freezer and
refrigerator
compartment).

CAUSES AND CHECK POINTS.
1) Lamp problem.
2) Bad lamp assembly.
3) Bad lamp socket.
Disconnection.
Short.

HOW TO CHECK

Filament blows out.
Glass is broken.
Not inserted.
Loosened by vibration.
Bad soldering.
Bad rivet contact.
Water penetration.

Low water
level in tray.

Bad elasticity of contact.
Bad contact (corrosion).
4) Door switch.
Defective
Refrigerator and freezer switch is reversed.
Travel distance.
Bad connection.
Bad terminal contact.
P/U liquid leak.

9. Faulty internal
voltage (short).

1) Lead wire is damaged.
Wire damage when assembling PTC Cover.
Outlet burr in the bottom plate.
Pressed by cord heater. lead wire, evaporator pipe.
2) Exposed terminal.
Compressor Compartment terminal. - Touching other
components.
Freezer compartment terminal. - Touching evaporator pipe.
3) Faulty parts.
Transformer.
Coil contacts cover.
Welded terminal parts contact cover.
Compressor.
Bad coil insulation.
Plate heater.
Melting fuse.
Sealing is broken.
Moisture penetration.
Cord heater.
Pipe damaged.
Moisture penetration.
Bad sealing.
Sheath heater.

- 61 -

■ Connect conduction and
non-conduction parts and
check with tester.
Conduction: NG.
Resistance∞: OK.

PROBLEM DIAGNOSIS
CLAIMS.
10. Structure,
appearance
and others.

CAUSES AND CHECK POINTS.
1) Door foam.
Sag.

Bolt is loosened during
Transportation.
Not tightly fastened.
Screw worn out .
Adhesion surface.

Hinge loose

Weak gasket
adhesion.
Fixed tape.

Poorly applied.

Noise during
operation.

Hinge interference.

Malfunction.

Not closed Interference between door liner and inner liner.
Refrigerator
Stopper worn out.
compartment is
Bad freezer compartment door
opened when freezer
assembly.
compartment is
No stopper.
closed (faulty stopper).

2) Odor.
Temperature of
refrigerator
compartment.

High.

Bigger door foam.
Hinge-Pin tilted-Poor flatness.
No washer.
No grease or not enough
quantity.

Faulty damper control.
Button is set at weak.
Door is open (interference by
food).

Deodorizer.

No deodorizer.
Poor capacity.

Food Storage.

Seal condition.
Store special odorous food.
Long term storage.

Others.

Odors from chemical procucts.

- 62 -

HOW TO CHECK

2-1. Power
Problems

Causes

Checks

Measures

No power on

- Power cord cut.

- Check the voltage with tester.

- Reattach the components.

outlet.

- Faulty connector insertion.

- Check visually.

- Reattach the connecting parts.

- Faulty connection between plug

- Check visually.

- Reconnect the connecting parts.

- Check the fuse with tester

- Find and remove the cause of

Remarks

and adapter.
Fuse blows out. - Short circuit by wrong connection.
- Low voltage products are
connected to high voltage.
- Short circuit caused by insects.
- Electricity leakage.
- High voltage.

or visually.
- Check the input voltage with tester

- Replace with rated

problem(ex. short, high voltage,

fuse after confirm

low voltage).

its specification.

(between power cord and products). - Replace with rated fuse.
■ If fuse blows out

- Check the resistance of power cord
with tester (if it is 0Ω, it is shorted).

frequently, locate

- Short circuit of components

the cause and remedy.

- 63 -

(tracking due to moisture and dust
penetration).

2-2. Compressor
Problems
Compressor

Causes
- Faulty PTC.

does not

Checks
- Check the resistance.
Value:∞ is defective.

operate.

Measures
- If resistance is infinite, replace it
with new one.
- If it is not infinite, it is normal.
- Check other parts.

- Compressor is frozen.

- If compressor assembly parts are

- During forced operation:

normal(capacitor, PTC, OLP),

- Operates: Check other parts.

apply power directly to the

- No operation: Replace the frozen

compressor to force operation.
Auxiliary winding

compressor with new one, weld,
evacuate, and recharge refrigerant.

Main winding
Power

OLP

It starts as soon as it is
contacted.

• Refer to weld repair procedures.

Remarks

PROBLEM DIAGNOSIS

2. Faults

Problems

Causes

Checks

High

Poor cool air circulation due to faulty - Lock –– Check resistance with a

temperature

fan motor.

Measures

Remarks

- Replace fan motor.

tester.

in the freezer

0Ω: short.

compartment.

∞Ω: cut.

- Reconnect and reinsert.

- Rotate rotor manually and check
rotation.
- Wire is cut.
- Bad terminal contact: Check
terminal visually.

- Maintain clearance and remove ice
(Repair and/or replace shroud if fan

- Fan constraint. – Fan shroud
contact: Confirm

is constrained by shroud
deformation).

visually.
– Fan icing:

- 64 -

Confirm visually.
Faulty fan motor due to faulty door
switch operation.

- Iced button (faulty) operation:
Press button to check

- Determine icing cause and repair.
- Replace door switch.

- Faulty button pressure and contact:
Press button to check operation.
- Door cannot press door switch
button: Check visually.

- Door sag: fix door.
- Door liner bent:replace door or
attach sheets.

Bad heating conditions in
compressor compartment.

- Check the clearance between the
refrigerator and wall (50 mm in
minimum).
- Check dust on the grill in
compressor compartment.

- Keep clearance between
refrigerator and walls (minimum
50mm).
- Remove dust and contaminants
from grill for easy heat transfer.

- Check dust on the coils condenser. - Remove the dust with vacuum
cleaner from the coils condenser
while the refrigerator is off.

- The fan may be
broken if cleaning
is performed while the
refrigerator is on.

PROBLEM DIAGNOSIS

2-3. Temperature

Problems
High

Causes
Refrigerant leak.

temperature

Checks

Measures

Check sequence

Weld the leaking part, recharge the

1. Check the welded parts of the

refrigerant.

in the freezer

drier inlet and outlet and drier

compartment.

auxiliary in the compressor

Remarks
Drier must be replaced.

compartment (high pressure side).
2. Check the end of compressor
sealing pipe (low pressure side).
3. Check silver soldered parts.
(Cu + Fe / Fe + Fe).
4. Check bending area of wire
condenser pipe in compressor
compartment (cracks can
happen during bending).

- 65 -

5. Check other parts (compressor
compartment and evaporators in
freezer compartment).
Shortage of refrigerant.

Check frost formation on the surface - Locate the leaking area, repair,
of evaporator in the freezer
compartment.
- If the frost forms evenly on the
surface, it is OK.
- If it does not, evaporator is not
good.

evacuate, and recharge the
refrigerant.
- If not leaking, remove the
remaining refrigerant, and recharge
new refrigerant.

Drier must be replaced.

PROBLEM DIAGNOSIS

2-4. Cooling

High

Causes
Cycle pipe is clogged.

temperature in

Checks
Check sequence.
1. Check temperature of condenser

the freezer

manually.

compartment.

Measures
- Heat up compressor discharging

Direr must be replaced.

weld joints by contact, disconnect
the pipes, and check for clogging.

If it is warm, it is OK.

Remove the cause of clogging,

If it is not, compressor discharging

weld, evacuate, and recharge

joints might be clogged.

the refrigerant.

2. Manually check whether hot line

Remarks

- If it's warm, it's OK. If it's not,

pipe is warm.

condenser discharging line weld

If it is warm, it's OK.

joints might be clogged.

If it is not, condenser outlet weld

Disconnect with torch, remove the

joints might be clogged.

causes, evacuate, and recharge
and seal refrigerant.

- 66 -

Leak at loop pipe weld joint

Check sequence.

Replace the compressor, weld,

(discharge) in compressor.

1. Manually check whether

evacuate, and recharge refrigerant.

condenser is warm.
If it is warm or hot, it is OK.
If it is cool, proceed with
repair.

Faulty cooling fan in the compressor
compartment.

Check sequence.

- Replace if motor does not operate.

1. Check cooling fan operation.

- If fan is disconnected, check for fan

2. Check that cooling fan is
disconnected from the motor.

damage and reassemble it.
■ Refer to fan motor disassembly
and assembly sequence.

Drier must be replaced.

PROBLEM DIAGNOSIS

Problems

Problems
No defrosting.

Causes
Heater does not generate heat as
the heating wire is cut or the circuit
is shorted.
1) Heating wire is damaged when
inserting into the evaporator.

Checks
1. Check the resistance of heater.
0Ω: Short. ∞Ω: Cut.
Tens to thousands Ω: OK.

3) Heating wire at lead wire contacts

0Ω: Short. ∞Ω: Cut.

Sucking duct and discharging hole
are clogged:
1. Impurities.
2. Ice.

Heating wire is short or wire is cut.

Seal the lead wire with
insulation tape and heat

explanations.

repair.

Tens to thousands Ω: Short.
1. Confirm foreign materials. In case 1) Push out impurities by inserting
of ice, insert the copper line

copper wire.(Turn off for more

through the hole to check.

than 3 hours and pour in hot water

2. Put hot water into the drain
(check drains outside).

if frost is severe.)
2) Put in hot water to melt down frost.
3) Check the water outlet.

- 67 -

4) Push the heater plate to sucking
duct manually and assemble the
disconnected parts.
Gap between Suction duct and

1. Check in the Suction duct.

Heater plate Ice in the gap.

1) Turn off the power, confirm
presence of impurities and ice in
the gap, and supply hot water until
the ice in the gap melts down.
2) Push the Heater plate to drain
bottom with hand and assemble
the disconnected parts.

Wrong heater rating (or wrong

1. Check heater label.

Faults: replace.

assembly).

2. Confirm the capacity after

- How to replace: Refer to main parts.

substituting the resistance value
into the formula.
V2 (V: Rated voltage of user country)
P= ––
R (R: Resistance of tester[Ω])
Compare P and level capacity.
Tolerance: ±7%

contraction tube if the cut
lead wire is accessible to

housing terminal and heater
surface.

Remarks

• Parts replacement: Refer to parts

2. Check the resistance between

2) Lead wire of heater is cut.
is cut.

Measures

PROBLEM DIAGNOSIS

2-5. Defrosting failure

No defrosting

Causes
Melting fuse blows out.

Checks
- Check melting fuse with tester. -

1) Lead wire is cut.

If 0Ω: OK.

2) Bad soldering.

If ∞Ω: wire is cut.

Ice in the Suction duct.

1. Check the inner duct with mirror.

1) Icing by foreign materials in the

Measures
Faullty parts: parts replacement.
- Check wire color when measuring
resistance with a tester.
1) Turn power off.
2) Raise the front side(door side),

duct.

support the front side legs, and let

2) Icing by cool air inflow through

the ice melt naturally. (If power is

the gap of heater plate.

on, melt the frost by forced

3) Icing by the gap of heater plate.

defrosting.)
2. Check by inserting soft copper

3) Reassemble the heater plate.

wire into the duct (soft and thin
copper not to damage heating wire).
Bad cool air inflow and discharge,

1. Turn on power, open or close the

1) Check the faulty connector of

- 68 -

and bad defrosting due to faulty

door, check that motor fan

housing and reassemble

contact and insertion (bad connector

operates (If it operates, motor fan

incorrectly assembled parts.

insertion into housing of heater,

is OK).

melting, fuse and motor fan).

2. Disconnect parts in the refrigerator
compartment, check the connection
around the housing visually,
defrost, and confirm heat generation
on the heater. Do not put hands on
the sheath heater.
3. Check the parts which have faults
described in 1, 2 (mechanical
model: disconnect thermostat
from the assembly).

2) If the parts are very damaged,
remove the parts and replace it
with a new one.

Remarks

PROBLEM DIAGNOSIS

Problems

Causes

Checks

Icing in the

1) Bad circulation of cool air.

- Verify the food is stored properly

refrigerator

- Clogged intake port in the

(see it discharge and intake port

compartment.

refrigerator compartment.

- Damper icing.

- Seal is not good.

- Pipe icing.

- Too much food is stored and

- Discharging
pipe icing.

blocks the discharge port.
- Bad defrosting.

are blocked).
- Check icing on the surface of
baffle and cool air path (pipe) after
dissembling the container box.
- Check icing at intake ports of

Measures
- Be acquainted with proper use.

Remarks
- Check the defrost

- Seal on connecting parts.

related parts if problem

- Check the damper and replace

is caused by faulty

it if it has defects.

defrosting.

- Check defrost. (After forced
defrosting, check ice in the
evaporator and pipes.)

freezer and refrigerator
compartment.
2) Faulty door or refrigerator
compartment.

- Check gasket attachment.
- Check door assembly conditions.

- Faulty gasket.

- Correct the gasket attachment
conditions or replace as necessary.
- Door assembly and replacement.

- Replacement should
be done when gasket
cannot be repaired.

- Faulty assembly.
3) Overcooling in the refrigerator

- 69 -

compartment.
- Faulty damper in the refrigerator
compartment.

- See if refrigerator compartment

- Replace faulty parts.

is overcooling (when button
pressed on weak).
- Check for faulty parts.

- Faulty MICOM (faulty sensor)
4) Bad defrosting
- Heater wire is cut.
- Defective defrost sensor.
- Defrosing cycle.

- Check frost on the evaporator
after dissembling shroud and fan
grille.

- Check parts related to defrosting.
- Check defrosting. (Check ice on the
evaporator and pipe.)

- Check for ice on intake port of

- Moisture does not
on the evaporator but
is sucked into the
refrigerator, being

freezer and refrigerator

condenses and ices,

compartments.

with coolain circulation,
and suppressing
sublimation.

5) Customers are not familiar with
this machine.
- Door is left open.
- High temperature, high moisture,
and high load.

- Check food interfering with door
closing.
- Check ice on the ceilings.

- Acquaint customers with how to
use.

PROBLEM DIAGNOSIS

2-6. Icing

Causes

Ice in the freezer 1) Bad cool air circulation.
compartment.
- Surface of fan
grille.

- Intake port is clogged in the freezer
compartment.
- Discharging port is clogged.

- Wall of freezer - Too much food is stored.
compartment.

- Bad defrosting.

- Cool air

Checks
- Check food storage conditions
visually.(Check clogging at intake
and discharge ports of cool air.)
- Check food occupation ratio in

Measures
- Be acquainted with how to use.
- Check defrost (Check for ice on the

Remarks
- Check the parts related
to defrosting if the

evaporator and pipes after forced

problem is caused by

defrosting).

the faulty defrosting.

volume(Less than 75%).
- Check frost on the evaporator after
dissembling shroud and fan grille.

discharging port.

- Check for icing at intake port of

- Basket(rack)

refrigerator compartment.

area.
- Food surface. 2) Bad freezer compartment door
- Icing in the
shute.

- Faulty gasket

- Check gasket attachment
conditions.

- Correct the gasket attachement
conditions and replace it.

- 70 -

- Faulty assembly

- Check door assembly conditions.

- Door assembly and replacement.

3) Over freezing in the freezer

- Refrigerator operation pulls down.

-Replace defective parts.

compartment.
- Faulty MICOM.

(Check if it is operates
intermittently)
- The Temperature of freezer
compartment is satisfactory, but
over freezing occurs in the
refrigerator compartment even
though the notch is set at weak.

4) Bad defrosting.
- Heater wire is cut.
- Faulty defrost sensor.
- Defrosting cycle
5) User is not familiar with how to
operate.
- Door remains opened.
- High moisture food water is stored.

- Check frost on the evaporator after - Check parts related to defrosting.
dissembling shroud and grille.

- Check defrosting. Check ice on the

- See if ice is the intake port in the

evaporator and pipes after forced

refrigerator compartment.
- See if food holds doors are open.
- See if ice on the ice tray.

defrosting.
- Be acquainted with how to use.

- Replace gasket when it
cannot be repaired.

PROBLEM DIAGNOSIS

Problems

Problems
Hiss sound

Causes
1. Loud sound of compressor
operation.

Checks
1.1 Check the leveling of the
refrigerator.
1.2 Check the bushing seat
conditions (sagging and aging).

Measures
1) Maintain horizontal level.
2) Replace bushing and seat if they
are sagged and aged.
3) Tuch the piping at various
place along is route. Install a
dampe at the point where your
tuch reduces the noise.

2. Pipes resonate sound which is
comes from the compressor.

2.1 Check the leveling of pipes
connected to the compressor
and their interference.
2.2 Check bushing inserting
conditions in pipes.

4) Avoid pipe interference.
5) Replace defective fan and fan
motor.
6) Adjust fan to be in the center of
the fan guide.

2.3 Touch pipes with hands or screw 7) Leave a clearance between

- 71 -

- driver (check for change of
sound).

interfering parts and seal gaps in
the structures.
8) Reassemble the parts which

3. Fan operation sound in the freezer 3.1 Check fan insertion depth and
compartment.

see if there is blade damage.
3.2 Check for interference with
structures.
3.3 Check fan motor.
3.4 Check fan motor bushing
insertion and aging conditions.

4. Fan operation sound in the
compressor compartment.

4.1 Same as fan confirmation in the
refrigerator.
4.2 Check drip tray leg insertion.
4.3 Check the screw fastening
conditions at condenser and
drip tray.

make produce sound.
9) Make a clearance if evaporator
pipes and suction pipe contact
freezer shroud.

Remarks

PROBLEM DIAGNOSIS

2-7. Sound

Causes

Vibration sound. 1. Vibration of shelves and foods in
(Clunk)

the refrigerator.
2. Pipe interference and capillary
tube touching in the compressor.
compartment.
3. Compressor stopper vibration.
4. Moving wheel vibration.
5. Other structure and parts
vibration.

Checks
1-1. Remove and replace the
shelves in the refrigerator
1-2. Check light food and container
on the shelves.
2-1. Touch pipes in the compressore
compartment with hands.
2-2 See if capillary tube touches
cover back.
3-1 Check for compressor stopper
vibration.
4-1 Check for vibration of front and
rear moving wheels.

Measures
1) Reassemble the vibrating parts
and insert foam or cushion where
vibration is severe.
2) Leave a clearance where parts
would otherwise interfere with
each other.
3) Reduce vibration with bushing
and restrainer if it is severe.
(especially, in compressor and
pipes).
4) Replace compressor stopper if it
vibtates severely.

5-1 Touch other structures and parts.

- 72 -

Irregular sound. 1. It is caused by heat expansion
(Click).

and contraction of evaporator,

1-1 Check time and place of sound
sources.

1) Explain the principles of refrigeration
and that the temperature difference

shelves, and pipes in the

between operation and defrosting

refrigerator.

can produce sounds.
2) If evaporator pipe contacts with other
structures, leave a clearance between
them (freezer shroud or inner case).

Remarks

PROBLEM DIAGNOSIS

Problems

Causes

Checks

Whining Sound It happens when refrigerant expands - Check the sound of refrigerant at the
(almost the same at the end of capillary tube.
as animals crying

initial installation.
- Check the sound when the refrigerator

sound).

starts operation after forced defrosting.
- Check the restrainer attachment
conditions on the evaporator and
capillary tube weld joints.

Measures
- Check the restrainer attached on the
evaporator and capillary tube weld
joints and attach another restrainer.
- If sound is continuous and servere, insert
capillary tube again (depth 15±3mm)
- Fasten the capillary tube to suction
pipes or detach in the compressor
compartment.
- Explain the principles of the freezing
cycle.

Water boiling or
flowing sound.

This happens when refrigerant passes
orifice in accumulator’s internal pipes

- 73 -

due to the pressure difference between
condenser and evaporator.

- Check for the sound when compressor
is turns on.
- Check for the sound when compressor
is turns off.

- Explain the principles of freezing cycles
and refrigerant flowing phenomenon by
internal pressure difference.
- If sound is servere, wrap the
accumulator with foam and restrainer.

Sound of whistle

When door closes, the internal pressure

when door

of the refrigerator decreases sharply

closes.

below atomosphere and sucks air into
the refrigerator, making the whistle
sound.

- Check the sound by opening and
closing the refrigerator or freezer doors.

- Broaden the cap of discharge hose for
defrosting in the compressor
compartment.
- Seal the gap with sealant between out
and inner cases of hinge in the door.

Remarks

PROBLEM DIAGNOSIS

Problems

Problems
Food Odor.

Causes
Food (garlic, kimchi, etc)

Checks
- Check to see if food is not
wrapped.
- See if the shelves or inner wall
are stained with food juice.
- Check the food in the adhesive
wraps.

Measures
- Dry deodorizer in the bright well
ventilated place.
- Store the food in the closed
container instead of vinyl wraps.
- Clean the refrigerator and set the
cooling to strong.

- Check food for spoilage.
Plastic Odor.

Odors of mixed food and plastic
odors.

- See if wet food is wrapped with
plastic bowl or bag.
- Certain odors are common in new
refrigerator.

- 74 -

Odor from the
deodorizer.

Odor from the old deodorizer.

- Check the deodorizer odors.

- Clean the refrigerator.
- Persuade customers not to use
plastic bag or wraps with wet food
or odorous foods.
- Dry the deodorizer with dryer and
then in a birght and well
ventilated place.
- Remove and replace the
deodorants.

Remarks

PROBLEM DIAGNOSIS

2-8. Odor

Problems

Symptom

Causes

Checks

Measures

Remarks

Bad PCB

All display

Bad connection

Bad connector

Visual check on connector

Reattach

electric power.

LCDS are off.

between Main PCB

connection from main

connection.

connector.

and display circuit.

PCB to display PCB.

Defective PCB

PCB transformer

Check resistance of PCB

Replace PCB

Applicable to

transformer

winding is cut.

trans input and output

transformer or PCB.

model without

PCB transformer

terminals with a tester.

temperature fuse

(If resistance is infinity,

is burnt out.

trans winding is cut).

DefectivePCB electric

Defective regulator IC

Check voltage at input/output

circuit parts.

(7812, 7805).

terminals.

dispenser.

Replace regulator.

Refer to electric
circuit in circuit
explanation.

- 75 -

PCB electric terminal

Check fuse in PCB electric

fuse is burnt out.

terminal with a tester.

STR Parts are

Check if STR No. 2 and 3 pins

damaged.

are cut when power is off.

Replace PCB fuse.
Replace parts.

Applicable to
model with
dispenser.

Abnormal

Bad connection

Lead Wire connecting

Check Lead Wire terminals

Reconnect Lead

display LCD

between Main PCB

main PCB and display

connecting Main PCB and

Wire and directly

operation

and display circuit.

PCB is cut or connector

display PCB with a tester.

connect defective

Defective LCD
module.

terminal connection is

contact terminal to

bad.

Lead Wire.

Defective LCD.

Check if all LCDs are on when

Replace display

Refer to display

Main PCB Test switch is

PCB.

circuit in circuit

pressed (or when both freezer
key and power freezer key are
pressed at the same time for
more than one second.)

explanation.

PROBLEM DIAGNOSIS

2-9. Micom

Bad cooling.

Symptom

Causes

Checks

Measures

Freezer

Compressor does

Compressor Lead Wire

Check compressor Lead Wire

Reconnect Lead

temperature is

not start.

is cut.

with a tester.

Wire.

Defective compressor

Measure voltage at PCB CON5

Replace relay RY1

(3&9) after pressing main PCB

and RY14 or PCB.

high.

drive relay.

Remarks

Refer to load
driving circuit in

test switch once. It is OK if

circuit

voltage is normal.

explanation.

Defective freezer

Defective Freezer

Check resistance of freezer

Replace freezer

Refer to

sensor.

sensor parts.

sensor with a tester.

sensor.

resistance
characteristics
table of sensor in
circuit

- 76 -

Freezer sensor is

Confirm the color of sensor in

Repair main PCB

substituted for other

circuits (main PCB sensor

sensor housing

sensor.

housing).

Defective freezer fan

Fan motor lead wire

Check fan motor lead wire

Reconnect lead

motor.

is cut.

with a tester.

wire.

• Defective door switch

Measure the voltage between

• Replace door

(freezer, refrigerator,

PCB power blue line and fan

switch (freezer,

drive circuits in

home bar).

motor after pressing test switch

refrigerator and

circuit

• Defective fan motor.

of Main PCB. If the voltage is

home bar).

explanation.

• Defective fan motor

normal, it is OK.

drive relay.

explanation.

Refer to load

• Replace fan motor.
• Replace relay RY5
& RY6 or PCB.

Faulty defrost.

Refer to faulty defrost items in problem diagnosis

Refer to problem

functions.

diagnosis
function.

PROBLEM DIAGNOSIS

Problems

Bad cooling

Symptom
Wrong

Causes
Defective AC Damper. Check AC damper

Checks

Measures

Using a tester, see if AC

Reconnect lead
wire.

Refrigerator

motor and reed switch

damper motor and reed switch

temperature.

and lead wire are cut.

lead wire are cut with a tester.

Check AC damper

Refer to AC damper in parts

Replace AC damper

part.

repair guide.

or refrigerator control

Remarks

box ASSEMBLY.
Check AC damper

Refer to AC damper in parts

Replace relay or

Motor drive relay in

repair guide.

PCB.

Refer to single
motor damper
drive circuits
in circuit
explanation.

- 77 -

Foreign materials in AC

Check AC damper baffle

Remove foreign

damper baffles

visually.

materials.

Ice formation on AC

Check if AC damper Heater

Replace AC damper

damper baffles

wire is cut with a tester.

or refrigerator control
Box ASSEMBLY.

Defective refrigerator

Check the resistance of

sensor

sensor parts.

refrigerator sensor with a tester. sensor.

Replace refrigerator

Refer to sensor
resistance
characteristic
table in circuit
explanation.

Refrigerator sensor is

Visually inspect the sensor

Repair main PCB

substituted for other

color in the circuit. (main PCB

sensor housing.

sensor.

sensor housing.)

Defective refrigerator

Visually if refrigerator sensor

Reposition the

sensor assembly

is not fixed at cover sensor but

refrigerator sensor.

condition.

inner case visually.

PROBLEM DIAGNOSIS

Problems

Bad defrost.

Symptom
Defrost is not

Causes
Defrost lead wire is cut.

working.
Defective defrost drive relay.

Defective defrost sensor parts.

Checks

Measures

Remarks

Using a tester, check if defrost lead

Reconnect Lead

wire is cut with a tester.

Wire.

Check the voltage of CON5 (1 and 7)

Replace relay (RY 7

Refer to load

with a tester after pressing main

and RY 14) or PCB.

driving conditions

PCB test switch twice.

check in circuit

If the voltage is normal then relay is OK.

explanation.

Check the resistance of defrost sensor

Replace defrost

Refer to sensor

with a tester.

sensor.

resistance
characteristic
table of circuit
explanation.

- 78 -

Defective

Buzzer

Defective connecting lead wire from

Check lead wire related to door

buzzer

continuously

main PCB to door switch.

switch with a tester.

rings or door

Defective door switch parts.

Refer to door switch in parts repair

opening alarm

Repair lead wire.
Replace door switch.

guide.

does not work.
Defective

Buzzer does

Key input wire is cut or bad connector

Check input wire with a tester.

Reconnect lead

display button

not ring and

terminal contact in main PCB and

wire and replace or

circuit in circuit

key does not

display PCB connecting lead wire.

directly connect bad

explanation.

function when

contact terminal to

pressed.

lead wire.

Key is continuously depressed due to

Disassemble frame display and confirm

Adjust or replace

structural interference.

visually.

interfering
structures.

Refer to display

PROBLEM DIAGNOSIS

Problems

Symptom

Causes
Trouble mode indication.

Checks
Check problem diagnosis function.

Measures
Remedy faults

Remarks

Defective

Buzzer rings

display button.

but key does

Refer to mode
indication in

function when

function

button is

explanations.

pressed.
Bad water/ice

Buzzer

Defective connecting lead wire from

Check lead wire associated with door

dispenser.

continuously

main PCB to door switch.

switch.

rings or door

Defective freezer compartment door

Refer to door switch in parts repair

Replace Freezer

open alarm

switch parts.

guide.

compartment door

does not work.

Repair lead wire.

switch.

- 79 -

Ice and water

Defective connecting lead wire from

Check Lead Wire associated with lever

do not

Main PCB to lever switch.

switch with a tester.

dispensed.

Defective lever switch parts

Refer to door switch in parts repair guide. Replace lever switch.

Defective photo coupler IC parts.

Check voltage change at photo coupler

Replace photo

output terminals when lever switch

coupler IC or PCB.

Repair lead wire.

pressed. It is OK if voltage change is
from 0V - 5V.
Defective relay associated with ice

Check relay (RY9, RY11, RY12)

Replace defective

dispense (geared motor, cube and

with a tester.

relay.

Check resistance of parts with a tester.

Replace defective

dispenser solenoid).
Defective parts associated with ice
dispenser (geared motor, cube and

parts.

dispenser solenoid).
Defective relay associated with water

Check relay (RY10) with a tester

dispenser.
Defective parts associated with water
dispenser.

Replace defective
relay.

Check resistance of parts with a tester.

Check model
with dispenser.

Replace defective
parts.

PROBLEM DIAGNOSIS

Problems

PROBLEM DIAGNOSIS
3. Cooling Cycle Heavy Repair
3-1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant
NO.

Items

1 Pipe and piping
system opening
time.

2 Welding.

Unit
Min.

Standards

Purposes

Pipe: within 1 hour.
Comp: within 10
minutes.
Drier: within 20
minutes.

Nitrogen Weld under Nitrogen
Pressure. atmosphere
(N2 pressure: 0.1~0.2
kg/cm2)

3 N2 sealed parts.

4 Refrigeration Evacuation
Cycle.
time

Confirm
N2 leak.

Confirm air leaking
sounds when
removing bushing
cap.
Sound:usable
No sound: not usable

Remarks

To protect
from
Moisture
Intrusion.

The opening time should be reduced to a half
of the standards during rain and rainy seasons
(the intrusion of water into the pipe is
dangerous).

To protect
from oxide
scale
formation.

- Refit to repair note in each part.
- R134a refrigerant is more susceptible to
leaks than R12 and requires more care
during welding.
- Do not apply force to pipes before and after
welding to protect pipe from cracking.

To protect
from
moisture
penetration.

- In case of evaporator parts, if there is no
make noise when removing bushing cap blow
dry air or N2 gas for more than 1 min before
using the parts.

Min.

More than 40 minutes.

Vacuum
degree

Torr

Below 0.03(ref)

Note: Only applicable to models equipped with
reverse flow protect plate.

Vacuum

High and low Pressure
sides are evacuated at
the same time for
models above 200L

Vaccum efficiency can be improved by
operating compressor during evacuation.

Vacuum
piping

Use R134a exclusive
manifold.

To protect
mixing of
mineral and
ester oils.

Use R134a exclusive.

To protect R12
Refrigerant
mixing.

Pipe
coupler
Outlet
(Socket)

R134a exclusive.

The bushing pipes for R12 refrigerant will melt
when they are used for R134a refrigerant
causes of leak.

R134a exclusive

Plug
5 Refrigerant
weighing.

To remove
moisture.

Use R134a
exclusively.
Weighing allowance:
±5g
Note:Winter: -5g
Summer: +5g

Do not mix
with R12
refrigerant.

6 Drier replacement.

- Use R134a exclusively
for R134a refrigerator
- Use R12 exclusively for
R12 refrigerator
- Replace drier whenever
repairing refrigerator
cycle piping.

To remove
the
moisture
from pipe.

7 Leak check.

- Do not use soapy
water for check. It
may be sucked into
the pipe by.

Detect
refrigerant
leak area.

- Do not weigh the refrigerant in too hot or too
cold an area.(25°C [77°F] is adequate.)
- Use copper charging canister
Socket: 2SV Plug: 2PV R134a
Note: Do not burn O-ring (bushing) during
welding.

- Check oil leak at refrigerant leak area.
Use electronic leak detector if oil leak is not
found.
- The electronic leak detector is very sensitive to
halogen gas in the air. It also can detect
R141b in urethane. Please practice, therefore,
many times before use.

NOTE) Please contact Songso company on +82-53-554-2067 if you have inquiry on heavy repair special facility.

- 80 -

PROBLEM DIAGNOSIS
3-2. Summary Of Heavy Repair
Process

Contents

Tools

Problem
diagnosis
Remove refrigerant
Residuals

- Cut charging pipe ends and discharge refrigerant from
drier and compressor.
- Use R134a oil and refrigerant for compressor and drier

Parts
replacement
and welding

Filter, side cutters

Pipe Cutter, Gas welder, N2 gas

- Confirm N2 sealing and packing conditions before use.
Use good one for welding and assembly.
- Weld under nitrogen gas atmosphere.(N2 gas pressure:
0.1-0.2kg/cm2).
- Repair in a clean and dry place.
- Evacuate for more than forty minutes after connecting
manifold gauge hose and vacuum pump to high (drier)

Vacuum

Vacuum pump R134a
exclusively, Manifold gauge.

and low (compressor refrigerant discharging parts)
pressure sides.
- Evacuation Speed:113liters/minute.

Refrigerant
charging and
charging
inlet welding

- Weigh and control the allowance of R134a chargine
canister in a vacuum conditions to be ±5 g with

canister (mass cylinder),

electronic scales andcharge through compressor inlet

refrigerant R134a manifold gauge,

(Charge while compressor operates).

electronic scales, punching

- Weld carefully after pinching off the inlet pipe.

off flier, gas welding machine

- Check for leakage at weld joints.

Electronic Leak Detector,

Minute leak: Use electronic leak detector

Check
refrigerant leak
and cooling
capacity

R134a exclusive chargine

Driver(Ruler).

Big leak: Check visually.
Note:Do not use soapy water for check.
- Check cooling capacity
➀ Check radiator manually to see if warm.
➁ Check hot line pipe manually to see if warm.
➂ Check frost formation on the whole surface of the
evaporator.

Compressor
compartment
and tools
arrangement

- Remove flux from the silver weld joints with soft brush
or wet rag. Flux may be the cause of corrosion and
leaks.
- Clean R134a exclusive tools and store them in a clean
tool box or in their place.

Transportation
and
installation

- Installation should be conducted in accordance with the
standard installation procedure. Leave space of more
than 5 cm from the wall for compressor compartment
cooling fan mounted model.

- 81 -

Copper brush, Rag, Tool box

PROBLEM DIAGNOSIS
3-3. Precautions During Heavy Repair
Items

Precautions

1. Use of tools.

1) Use special parts and tools for R134a.

2. Removal of retained

1) Remove retained refrigerant more than 5 minutes after turning off a refrigerator.

refrigerant.

(If not, oil will leak inside.)
2) Remove retained refrigerant by cutting first high pressure side (drier part) with a nipper and
then cut low pressure side. (If the order is not observed, oil leak will occur.)
Evaporator

Compressor
Drier
2

Low pressure side

Condenser
1 High pressure side

3. Replacement of drier.

1) Be sure to replace drier with R134a only when repairing pipes and injecting refrigerant.

4. Nitrogen blowing

1) Weld under nitrogen atmosphere in order to prevent oxidation inside a pipe.

welding.
5. Others.

(Nitrogen pressure : 0.1~0.2 kg/cm2.)
1) Nitrogen or refrigerant R134a only should be used when cleaning and sealing inside
of cycle pipes inside and sealing.
2) Check leakage with an electronic leakage tester.
3) Be sure to use a pipe cutter when cutting pipes.
4) Be careful not to let the water let intrude into the inside of the refrigerant cycle path.

- 82 -

PROBLEM DIAGNOSIS
3-4. Practical Work For Heavy Repair
Items

Precautions

1. Removal of residual

Evaporator
Low pressure side

refrigerant.
Compressor

Drier

Suction
Refrigent
Intake

Release Condenser

High pressure side

NOTE:
Observe the sequence for
removal of refrigerant.
(Otherwise, compressor oil
may leak.)

1) Remove residual refrigerant more than 5 minutes later after turning off the refrigerator.
(Otherwise, compressor oil may leak inside.)
2) Remove retained refrigerant slowly by cutting first high pressure side (drier part) with a
nipper followed by cutting the low pressure side.
2. Nitrogen blowing
Evaporator

welding.

Drier

Refrigent
Intake

Condenser

High pressure side

NOTE:
Welding without nitrogen
blowing produces oxidized
scales inside a pipe, which
affect on performance and
reliability of a product.

When replacing a drier:
Weld and parts by blowing nitrogen(0.1~0.2kg/cm2) to high pressure side after
assembling a drier.
When replacing a compressor:
Weld and parts by blowing nitrogen to the low pressure side.
Note) For other parts, nitrogen blowing is not necessary because not all welding is performed
for a long enough time to produce oxidation scales.
3. Replacement of drier.
* Unit : mm

12 Filter

NOTE:
Be sure to check the
inserted length of capillary
tube when it is inserted. (If
too much is inserted, the
capillary tube is blocked by
a filter.)

Inserting a capillary tube
Measure distance with a ruler and put a mark(12+3/-0)on the capillary tube. Insert tube to the
mark and weld it

- 83 -

PROBLEM DIAGNOSIS
Items

Precautions
Evaporator

4.Vacuum degassing.

Suction pipe
Compressor
Drier

Condenser
3
2

Low
pressure

High
pressure

Blue
Yellow
Red

NOTE:
- If power is applied
during vacuum
degassing, vacuum
degassing shall be
more effective.

Vaccum
Pump
Pipe Connection
Connect a red hose to the high pressure side and a blue hose to the
low pressure side.
Vacuum Sequence
Open valves and and evacuate for 40 minutes. Close valve .

- Operate compressor
while charging
refrigerant. (It is
easier and more
certain to do like
this.)

5.Refrigerant charging.
Charging sequence
1) Check the amount of refrigerant supplied to each model after completing vacuum
degassing.
2) Evacuate bombe with a vacuum pump.
3) Measure the amount of refrigerant charged.
- Measure the weight of an evacuated charging canister with an electronic scale.
- Charge refrigerant into a charging canister and measure the weight. Calculate the weight
of refrigerant charged into the bombe by subtracting the weight of the evacuated bombe.
Indicates the weight of
an evacuated bombe
R134a

NOTE:
- Be sure to charge
the refrigerant at
around 25°C [77°F].
- Be sure to keep -5g
in the winer and
+5g in summer

Calculation of amount of refrigerant charged
the amount of refrigerant charged= a weight after charging a weight before charging (the weight of an evacuated cylinder)

- 84 -

PROBLEM DIAGNOSIS
Items

Precautions
Evaporator

Compressor
Drier
Condenser
Bombe
4) Refrigerant Charging
Charge refrigerant while operating a compressor as shown above.
5) Pinch a charging pipe with a pinch-off plier after completion of charging.
6) Braze the end of a pinched charging pipe with copper brazer and perform a gas leakage
test on the welded parts.
6. Gas-leakage test

* Take for leaks on the welded or suspicious area with an electronic leakage tester.

7. Pipe arrangement

Verify that each pipe is placed in its

in each cycle

original location before closing a cover
after completion of work. Particularly

Bushing

check the size of Joint Drain Pipe

3-5. Standard Regulations For Heavy Repair
1) Observe the safety precautions for gas handling.
2) Use JIG (or wet towel) in order to prevent electric wires from burning during welding. (In order to prevent insulation
damage and consequent accidents.)
3) The inner case shall will melt and the insulation material (polyurethane) shall be damaged if care is not taken during
welding of inner case parts.
4) The copper piping wil oxidize from overheating if care is not taken during welding.
5) Do not allow aluminum and copper pipes to touch. (In order to prevent corrosion.)
+3
6) Observe that the inserted length of a capillary tube into a drier should be 12 -0 mm.

Drier
Molecular Pipe

Molecular
Sieves

12 - mm
0

7) Make sure that the inner diameter is not be distorted while cutting a capillary tube.
8) Be sure that a suction pipe and a filling tube are not be substituted for each other during welding. ( High efficiency
pump.)

- 85 -

PROBLEM DIAGNOSIS
3-6. Brazing Reference Drawings

PIPE ASSEMBLY, HOT LINE
(Freezer)

PIPE ASSEMBLY, HOT LINE
(Refrigerator)

Copper Brazer
Copper
Brazer

CAPI - TUBE

Copper
Brazer

DRIER ASSEMBLY

Silver Brazer
PIPE ASSEMBLY, SUCTION

PIPE ASSEMBLY, JOINT

Copper
Brazer

Copper Brazer

PIPE ASSEMBLY,
JOINT
Copper Brazer

- 86 -

Coppper Brazer

CONDENSER
ASSEMBLY, WIRE
Silver Brazer

PROBLEM DIAGNOSIS
4. HOW TO DEAL WITH CLAIMS
4-1. Sound
Problems
Hiss sounds

Checks and Measures
■ Explain general principles of sounds.
• All refrigerator when functioning properly have normal operating sound. The
compressor and fan produce sounds.
There is a fan in the freezer compartment which blows cool air to freezer and
refrigerator compartments. Hiss sounds are heard when the air passes through
the narrow holes into the freezer and refrigerator compartments.
■ Cooling Fan sound in the compressor compartment.
• There is a fan on the back of the refrigerator, which cools the compressor
compartment. If there is a small space between the refrigerator and the wall,
the air circulation sounds may be noticeable.
■ Noise of Compressor.
• This operating sound happens when the compressor compresses the
refrigerant. The compressor rotates at 3600RPM. The sound of compressor
operation becomes louder as the refrigerator capacity increases.

Click sounds

■ Explain the principles of temperature change.
• The sounds happens when pipes and internal evaporator in the refrigerator
compartment expand and contract as the temperature changes during the
refrigerator operation. This sound also happens during defrosting, twice a day,
when the ice on the evaporator melts.

Clunk sound

■ Explain that it comes from the compressor when the refrigerator starts.
• When the refrigerator operates, the piston and motor in the compressor rotate
at 3600RPM. This clunk sound is caused by the vibration of motor and piston
when they start and finish their operation. This phenomena can be compared
with that of cars. When the car engine ignites and starts to rotate, the loud
sound quickly becomes quiet. When the engine stops, it stops with vibration.

Vibration sound

■ Check whether the sound whether it comes from the pipes vibration and
friction.
• Insert bushing or leave a space between pipes to reduce the noise.
• Fix the fan blade if the noise is due to the collision of fan and shroud.
• Fix the drip tray if it is loose.
■ Sound depends on the installation location.
• Sound becomes louder if the refrigerator is installed on a wooden floor or
near a wooden wall. Move it to the another location.
• If the refrigerator is not leveled properly, a small vibration can make a loud
sound. Please adjust the leveling of the refrigerator.

- 87 -

PROBLEM DIAGNOSIS
Problems

Checks and Measures

Sounds of water flowing

■ Explain the flow of refrigerant.
• When the refrigerator stops, the water flowing sound occurs.
This sound happens when the liquid or vapor refrigerant flows from the
evaporator to the compressor.

Click sounds

■ Explain the characteristics of moving parts.
• This noise comes from the MICOM controller's switch on the top of the
refrigerator when it is turns on and off.

Noise of Icemaker operation
(applicable to model with Icemaker).
- Noise produced by ice dropping
and hitting ice bin.
- Hiss noise, motor sounds .

■ Explain the procedure and principles of Icemaker operation.
• Automatic Icemaker repeats the cycle of water supplying ➝ icemaking ➝ ice
ejection. When water is supplied, the water supply valve in the machine room
makes sounds like Hiss and water flowing also makes sound. When water
freezes to ice, freezing sounds such as click, click are heard. When ice is being
ejected, sounds like Hiss produced by a motor to rotate an ice tray and ice
dropping and hitting ice bin sounds are also heard.

Noise when supplying water.

■ Explain the principles of water supplied to dispenser.
• When the water supply button in the dispenser is pressed, the water supply
valve in the compressor compartment opens and let the water flow to the water
tank in the lower part of the refrigerator compartment. The water is dispensed
by this pressure. When this happens, motor sound and water flowing sound are
heard.

Noise when supplying ice.

■ Explain the principles of ice supply and procedure of crushed icemaking in a
dispenser.
• When ice cube button is pressed, ice stored in the ice bin is moved by a Helix
Pusher and dispensed. If crushed ice button is pressed, the cube ice is
crushed. When this happens, ice crushing and hitting ice bin sounds are heard.

- 88 -

PROBLEM DIAGNOSIS
4-2. Measures for Temperature Related Symptoms
Problems

Checks and Measures

Refrigeration is weak.

■ Check temperature set by the temperature control knob.
• Refrigerator is generally delivered with the button set at normal use (MID).
But customer can adjust the temperature set depending on preference. If you
feel the refrigeration is weak, then set the temperature control button at strong
position. If you adjust the setting for the freezer compartment as well, the
refrigeration is stronger than adjusting refrigerator only.

The food in the chilled drawer is .
not frozen but defrosted

■ The chilled drawer does not freeze food.
• Use chilled drawer for storing fresh meat or fish for short periods. For storing for
a long periods or freezing food, use a freezer compartment. It is normal that
frozen foods thaw above the freezing temperature (in the chilled drawer).

Refrigerator water is not cool.

■ Check the water storage location.
• If water is kept in the door rack, recommend storing it in the refrigerator
compartment shelf. It will then become cooler.

Ice cream softens.

■ Explain the characteristics of ice cream.
• The freezing point of ice cream is below -15°C[5°F]. Therefore ice cream may
melt if it is stored in the door rack.
• Store ice cream in a cold place or set the temperature control button of a freezer
to strong setting.

Refrigeration is too strong.

■ Check the position of temperature control setting.
• Check if refrigeration is strong in whole area of the refrigerator or partly near the
outlet of the cooling air. If it is strong in whole area, set the control button to
weak. If it is strong only near the outlet of cool air, keep food (particularly wet
and easy to frozen such as bean curd and vegetables) away from the outlet.

Vegetables are frozen.

■ Check the vegetables storage.
• If vegetables are stored in the refrigerator shelf or chilled drawer instead of
vegetable drawer, they will be frozen. Set the control button to weak if they are
also frozen in the vegetable drawer.

The food stored at inside of
the shelf freezes even the
control button is set to MID.

■ Check if food is stored near the outlet of the cooling air.
• The temperature at cooling air outlet is always below the freezing point.
Do not store food near the outlet of the cooling air as it blocks the air circulation.
Do not block the outlet. If the outlet of the cooling air is blocked, the refrigerator
compartment will not be cooled.

- 89 -

PROBLEM DIAGNOSIS
4-3. Odor and Frost
Problems

Odor in the refrigerator compartment.

Checks and Measures

■ Explain the basic principles of food odor.
• Each food has its own particular odor. Therefore it is impossible to prevent or
avoid food odor completely when food is stored in a completely sealed
refrigerator compartment. The deodorizer can absorb some portions of the odor
but not completely. The intensity of odor depends on refrigerator conditions and
environment.

■ Check the temperature control button and set to strong.
• Clean inside of the refrigerator with detergent and remove moisture. Dry inside
the refrigerator by opening the door for about 3 or 4 hours and then set the
temperature control button to strong.

Frost in the freezer compartment

■ Explain the basic principles of frost formation.
• The main causes for frosting:
- Door is left open.
- Air penetration through the gasket
- Too frequent door opening. (parties. etc.)
- Hot foods are stored before they are cooled down. The temperature of freezer
is -19°C[-2.2°F]. if temperature is set at MID. If hot air comes into the
refrigerator, fine frost forms as cold air mixes with hot air. If this happens quite
often, much frost forms inside of the refrigerator. If the door is left open in
summer, ice may form inside of the refrigerator.

Frost in ice tray.

■ Explain basic principles of frost formation.
• When ice tray with full of water is put into a freezer compartment, the water
evaporates. If cool air fan operates, the moisture attached to the jaw (protruded
part) of ice mold will freeze and form frost. If warm water was put into the ice
mould, the situation will become worse.

- 90 -

PROBLEM DIAGNOSIS
4-4. Others
Problems

Checks and Measures

The refrigerator case is hot.

■ Explain the principles of radiator.
• The radiator pipes are installed in the refrigerator case and partition plate
between the refrigerator and the freezer compartment in order to prevent
condensation formation. Particularly in summer or after installation of
refrigerator, it may feel hot but this is normal. If there is not enough space to
dissipate heat, the case may be hotter due to lack of heat radiation. Please
install the refrigerator in a well-ventilated place and leave a clearance between
refrigerator and wall:

Small holes in a door liner

■ Explain that the hole is for releasing gas.
• A small hole in the door liner is for releasing gas during insulation materials
lining work. With a release hole, forming can be easily accomplished.

Electric bills are too expensive.

■ Check the use conditions.
• Excessive door opening and hot food storage cause the compressor to operate
continuously and increase the electric consumption and bills.

Condensation on the inside
wall of the refrigerator
compartment and the cover of
properly vegetable drawer.

■ Explain how to store foods
• Condensation forms when refrigerator is installed at damp area, door is
frequently opened, and wet foods are not stored in the air tight container or
wrapped. Be sure to store wet foods in the air tight container or in secure
wrapping.

When is the power connected?

■ When should the power be connected ?
• You can connect the power right after the installation. But if the refrigerator was
laid flat during transportation for a long period of time, then the refrigerant and
compressor oils are mixed up, and this will affect badly the performance of the
refrigerator. Be sure to connect the power 2~3 hours after refrigerator is
installed.

Door does not open properly.

■ Refrigerator compartment door does not open properly.
• When the door is open, warm open air comes into the compartment and is
mixed up with cool air. This mixed air shall be compressed and increases the
internal pressure when door is closed. This causes the door to more closely
adhere to the refrigerator in a moment. As the refrigerator guins use, this
symptom will diminish.

The front side should
be raised a little bit higher
than the rear side.

■ When the refrigerator compartment door is opened and closed, the freezer
compartment door moves up and down.
• When the refrigerator compartment door is opened or closed, fresh air comes
into the freezer compartment and moves up and down the freezer compartment
door.
■ Door opens too easily.
• There is a magnet in the gasket bushing so that it is. if door is securely closes
without a gap. Also, check to see if the foods in the refrigerator or freezer
compartments are holding the door open.
■ The doors do not close properly.
• If the rear side of the refrigerator is raised higher than front side, the doors shall
not be easily closed. Adjust the level of refrigerator with the levelling screws.

- 91 -

HOW TO DISASSEMBLE AND ASSEMBLE
1. DOOR
1) Remove lower cover and then disconnect water
supply tube in the lower part of freezer door.
• Pull the water supply tube forward while pressing
part to disconnect water supply tube as shown below.

(3) Disconnect upper hinge from a hinge supporter
by grasping the front part of upper hinge and lifting up
(Hinge Assembly, U) in arrow direction A and pull
forward in arrow B direction. Be careful so the door
does not fall down.

1
2
A

2) Remove a freezer door.
(1) Loosen hinge cover screw of freezer door and remove
cover. Disconnect all connecting lines except
grounding cord.

Hinge Cover

(4) Lift up the freezer door in arrow direction and
disconnect the door from the lower hinge . Don’t pull
a door forward.

Connecting

2 Line
1
Grounding
Cord

(2) Turn hinge lever in arrow A direction until it is
loosened and take it out in arrow B direction.
Hinge Lever

Note : • Lift up a freezer door until a water supply tube is
fully removed.
(5) Assembly is the reverse order of disassembly

A
B

Note : • When disconnecting refrigerator door, turn hinge
lever counterclockwise.
• If hinge lever or bracket hinge pin is deformed
during assembling freezer and refrigerator doors,
attach two screws (Tap Tite Screw, M6: Lower
fixing screw) in the hole of upper hinge.

- 92 -

HOW TO DISASSEMBLE AND ASSEMBLE
2. HANDLE

4. SHROUD, GRILLE FAN

1) , Disconnect Cap by using Hexagon Wrench Dirver.
2) Disconnect Handle.
3) Disconnect Holder by using Hexagon wrench Driver.

1) Loosen two screws after disconnecting a cap screw of a
grille fan(U) with a blade screwdriver.
2) Disassembly of a grille fan(U) : Pull forward after
opening hook at ➝ part with a blade screwdriver.
3) Disconnect housing A of a grille fan (L) from the main
body.
4) Disassembly of a grille fan (L) : Hold upper part of a
grille fan(L) and pull forward carefully.
5) Loosen two screws.
6) Disassembly of shroud. F(U) : Disconnect housing of B
after removing two rail guides with a balde screwdriver.
7) Disassembly of shroud. F(U) : Hold upper part and pull
forward.
8) Check foam PU sticking conditions around the shroud,
F(U) and F(L) during assembling. If damaged, torn or
poorly attached, assemble with a new one after sealing
well.

Cap

Hexagon Wrench
Driver

Holder

Handre

Holder

Grille Fan(U)

Cap,Screw

3. DEODORIZER

Grille Fan(L)

1) Loosen the screw in .
2) Pull out a deodorant cover forward (Fig. 1) while turning
a cover in arrow direction.
3) Take out a deodorizer carefully after opening hook in
arrow direction(Fig. 2).
4) Assembly is the reverse order of disassembly.

Shroud ,F(L)

Note : • Be sure to attach the aluminum plate of defrost
heater to the floor of intake before assembling.

Deodorizer

Hook

Shroud ,F(U)

- 93 -

HOW TO DISASSEMBLE AND ASSEMBLE
5. CONTROL BOX, R

6. CASE PWB

1) Disconnection of Cover Lamp, R(U) : Loosen one screw
in the center with a phillips screwdriver after pushing two
rail guides on the lower part of a control box, R with a
blade screwdriver, and pull the cover lamp, R(U)
forward.
2) Loosen four screws in A after taking out the lamp. Hold
a lower part of control box and take out a control box by
pulling forward and disconnect housing B from the
main body.

1) Loosen ten screws in and remove cover PWB by
pulling up in arrow direction.
2) When disassembling the whole case PWB, disassemble
all housings first and push the case PWB in arrow
direction to disassemble from the main body.
3) When disassembling Main PWB Assembly. and Sub.
PWB Assembly from a case PWB, open each hook and
disconnect.

1
Cover Lamp,R(U)

- 94 -

HOW TO DISASSEMBLE AND ASSEMBLE
7-2. Basic Model

7. ICEMAKER ASSEMBLY
7-1. Dispenser Model
1) How to disassemble:
(1) Remove ice bank from the freezer compartment.
(2) Loosen two screws on the upper part of Icemaker
bracket.
(3) Disconnect Icemaker bracket so that it can slide
forward.
(4) Disconnect Icemaker housing and sensor housing.
(5) Disconnect Icemaker horizontally by pressing
bracket hook part. ( Don’t disassemble further. The
set value may be changed.)
2) How to assemble : The assembly is the reverse order of
the above disassembly.

Bracket, Icemaker

1) How to disassemble:
(1) Remove ice tray assembly from the freezer
compartment.
(2) Pull out knob from the ice tray in arrow direction.
(At this time, pull out a knob in arrow direction while
shaking right and left as the knob is connected to
pins in A .)
(3) Spring can be removed by pulling ice tray in arrow
direction and pulling out a spring inserted in ice tray
axis from the hole of supporter ice tray.
2) How to assemble : Assembly is the reverse order of
disassembly.

Supporter Ice Tray

Hook
Pin
Icemaker Unit

Knob

Lever

Ice Tray

Spring

Sensor
Insulation
Sensor Cover

Note : It is important to put one end of spring into the hole
of the supporter ice tray and the other end on the
lower part of an ice tray when inserting spring into
the shaft.

Note : When the ice tray is not horizontal after assembly,
assembly was performed in correctly. Check and
assemble again.

- 95 -

HOW TO DISASSEMBLE AND ASSEMBLE
8. DISPENSER
1) Disconnect button assembly by pulling down until it
stops and then pull it forward.

4) Loosen four screws with a phillips screwdriver and pull
the funnel Assembly to disconnect.

Funnel Assembly

Funnel
Assembly

Button

5) Duct cap Assembly is disconnected if hold lever
connecting screw is loosened with a phillips screwdriver.
2) Remove display frame Assembly by making a gap
between a display frame Assembly. and funnel
Assembly. with a blade screwdriver and pulling it
forward. The cover dispenser is fixed with a hook.

Solenoid Assembly
Holder
Lever

Cap Assembly
Duct

3) Display Assembly can be disconnected by pressing the
upper part of a cover dispenser and pushing a display
Assembly. after disconnecting display frame Assembly.
housing.

6) For assembling a duct cap Assembly, insert one end of
a spring into the right hole of dispenser lever, and insert
the other end into the right hole in upper part of
dispenser. And then assemble a holder lever after fixing
the holder at the solenoid Assembly working part.
Sheet Heater
Spring

Dispenser Lever
Solenoid Assembly

- 96 -

HOW TO DISASSEMBLE AND ASSEMBLE
9. WATER TANK AND WATER LINE
u The water tank at back and lower part of a refrigerator is
attached by one screw and has a capacity containing of
7 glasses (180cc per glass) of cold water. It will take
time to make more cold water in the tank.
* The first portion of dispensed water is not cold even
though the refrigerator is working. In this case,
dispense ice first in the cup and then water to make a
water cold.

Bushing inject
Water supply pipe
Water supply pipe

Water Valve

Water Tank
Nut
Tube

Connect
Assembly

9-1. How to disassemble the water supply pipe
1) Disconnect five fixtures mounted on the rear wall of the
refrigerator after disconnecting the water supply pipe
from a water valve.
2) Remove the tie-wrap and two screws connected to the
bushing inject.
3) Replace the water supply pipe after disconnecting the
water supply pipe from a rubber inject. And assemble
the parts by performing disassembly in reverse order.

9-2. How to disassemble the water tank and the
water supply pipe
1) Disconnect the water supply pipe from a water valve
on the back and lower part of the freezer.
2) Disconnect the connector Assembly. in water supply
pipe at lower part of the freezer door.
3) Pull out the water supply pipe from the thermal
insulation materials after removing one screw and six
tie-wraps in the lower part of a refrigerator compartment.
4) Replace a water tank or a water supply pipe and
assemble the parts by performing disassembly in
reverse order.
Note : • The water supply pipe cannot be disassembled.
• Tightly fasten six tie-wraps to prevent leakage.

- 97 -

TMDS CABLE

Inverter
BACKLIGHT

T/Screen
Controller

CCD Camera

- 98 -

PROGRAM
PROTECTION

PROGRAM SAVE

SPEAKER
OUTPUT:5W+5W(PEAK)
HARDDISK

REMOTE CONTROLLER
SIGNAL CONTROL
REF ERROR SINGAL CONTROL
SOUND AMPLIFIER

Amplifier

Remocon CON'T
REF ERROR CON'T
MICOM

SUB Controller

SIGNAL REMOTE CONTROLLER
INPUT RECEIVER

PHOTO

RECORDING Microphone

TFT LCD

REMOTE CONTROLLER

USER
(Input/Output)

TOUCH INPUT

Touch Screen

Monitor ASSEMBLY

IDE PORT

Audio Out

Parallel PORT

S.M.P.S
(Free Voltage
INPUT VOLTAGE
:AC90~288V)

TV TUNER

REF MICOM

AC INPUT

PWB,SUB

Digital Part
ON/OFF S/W

TV
ANTENNA

USB
EXTENSION PORT

LAN LINE

TV SIGNAL RECEIVE

RJ-45

RS-232(EXTENSION PORT)

AC/DC CONVERTER
MAIN CONTROLLER
POWER SUPPLY
HDD POWER SUPPLY

REF ERROR SIGNAL

ATX
POWER IN

COM1
AV IN2

USB2

USB1

LAN

COM2

MANAGEMENT
BUTTON

Main Controller
(Geode GX 300)

AV IN1

LCD Out

T/S,Inv Out

RESET
BUTTON

DIGITAL SECTION LAYOUT

- 99 -

- 100 -

DIGITAL PARTS MANUAL
1. MAIN CONTROLLER
1-1. Function
This is one of the key components of the internet refrigerator, and it is a controller where TV, audio, video, input-output,
internet functions reside.

1-2. Connector Connection Diagram and Names
ATX POWER

IDE

COM2

COM1

LAN

USB

19
TV IN
18
7
17

CCD IN
16
TV
TUNER

PARALLEL
PORT

15
TOUCH
/INV
14
TMDS
LCD
8

13
12
MIC IN

POWER S/W
10

9
SOUND OUT

- 101 -

11
TV SOUND IN

DIGITAL PARTS MANUAL
1-3. Function and Connecting Parts
No

Name

Function

Connecting Part

USB

Connect to supporting device (External CDROM)

Extended connecting cable

LAN

Connect to Internet network cable

LAN connecting cable

COM1

Contol TV-tuner

TV-tuner

COM2

External Device Communication Port 2

Extended connecting cable

IDE

Hard disk data communication

Hard disk

ATX POWER

Main controller power service line

Power supply

PARALLEL PORT

Sub-controller communication

Sub-controller

POWER S/W

Sub-controller power supply, Reset/management

Reset PCB, sub-controller

S/W input

SOUND OUT

Audio output

Sub-controller

CD IN

External audio input (reserve terminal)

Reserve terminal

TV SOUND IN

TV sound input

TV-tuner

MIC IN

MIC sound input

MIC connector

KEYBOARD

Connect to keyboard for SVC

Keyboard (SVC)

TMDS LCD

Monitor visual output

TMDS connector

TOUCH/INV

T/Screen communication, LCD inverter power supply

T/Screen connector

TV TUNER

TV-Tuner data communication

TV-Tuner

VIDEO IN

External video input (reserve terminal)

Reserve terminal

CCD IN

Camera visual input

Camera connector

TV IN

TV visual input

TV-Tuner

- 102 -

DIGITAL PARTS MANUAL
1-4. Specifications of parts
1. Main CPU SPEC
(1) Maker Type: Geode GX1 300-B85
(2) Maker: National Semiconductor
(3) L1 Cache Size: 16KB
(4) CPU Power Consumption: 1.6V / 200MHz - 0.8W
2.0V / 300Mhz - 1.5W
(5) Memory Extend: Total 512MB Expansion possible
(up to 512 MB)
(6) O/S: Windows 98SE
2. Video, Audio Output, PCI-to-ISA Bridge
(1) Maker Type: CS5530A-UCE
(2) Maker: National Semiconductor
(3) Build-in Xpress Graphic / Audio
(4) Resolution: 1280 X 1024 (85MHz)
(5) Audio: AC97 Codec Interface
(6) 2 USB Interface
3. External A/V Input/Output handling
(A/V Input/Output - MUX)
(1) Maker Type: Fusion 878A
(2) Maker: Conexant
(3) NTSC, PAL, SECAM Video Support
(4) Resolution: 768 X 576 (Full PAL Resolution)
(5) 3 Composite Input support
(6) 3:1 MUX (TV, FM, MIC)

(3) Plug and play Compatibility (PnP)
(4) 24 GPIO bit ports
(5) FDC, KBC, two UARTs, IR support, IEEE1284 parallel
port
(6) RTC (Real Time Clock) Control
7. LAN-Ethernet
(1) Maker Type: RTL8139C
(2) Maker: Realtek
(3) 10Mb/s and 100Mb/s operation
(4) Wake-On-LAN function, Remote wake-up Support
(5) Half, Full duplex capability
(6) Integrated Fast Ethernet MAC Physical chip,
transceiver in one chip
8. Labeling
(1) Attach MAC ADDRESS, SERIAL NUMBER, PART
NUMBER labels to Section A
- Labeling location: Attach to Section A
(2) Attach ROM BIOS Version label to Section B
- Labeling location: Attach to Section B

4. Graphic Accelerator
(1) Maker Type: ATIM6-M(216M6TGDFA22E)
(2) Maker: ATI Technologies
(3) Embedded Memory: 8MB
(4) Color: 32 bit colors
(5) Highly-optimized 128 bit engine.
(6) LVDS and PaneLink Support with TMDS Transmitter.
5. Sound Input/Output handling (Sound Input/Output)

Record LG Model Name
Record ROM Version

(1) Maker Type: AD1819B
(2) Maker: Analog Devices
(3) S/N Ration: 90dB
(4) 16-Bit Full Duplex Codec
(5) Analog Input: LINE, CD, VIDEO, AUX, 2 MONO MIC
(6) 7kHz ~ 48kHz Sampling Rate (with 1Hz Resolution)
6. External Input/Output handling
(SUPER Input/Output)
(1) Maker Type: PC97317
(2) Maker: National Semiconductor

- 103 -

DIGITAL PARTS MANUAL
2. SUB-CONTROLLER
2-1. Function
: Sub Controller is composed of MICOM PART and AMP PART and
- MICOM PART: senses refrigerator error and passes signals from remote control transmits to main controller
- AMP PART: carries out the function of amplifying the small signal being input through the Sound Output of the MAIN
CONTROLLER

Section A
MICOM driving power,
remote control signal receiver

Section D
Transmits error
sensing signals,
remote control signals,
changed signals
to main controller

Section B
Error sensing
signal transmitter
for refrigerator
Section C
Error sensing
signal receiver for
refrigerator

Section E
AMP driving power

Section F
HEADPHONE output
terminal; when inserted,
speaker output is cut and
output is done only
through HEADPHONE

Section H
Transmits through
speakers the signals
amplified by the AMP

Section G
Receiver of small
signal sound emitted
by MAIN CONTROLLER

- 104 -

DIGITAL PARTS MANUAL
2-2. Outline Diagram and INPUT/OUTPUT Structure
2-2-1. Outline Diagram

2-2-2. INPUT/OUTPUT Structure
SYMBOL

CON1

CON2

CON4

1
2
3
4
5
1
2
3
4
5
6
7
1
2
3
4
5
6
7
8
9
10
11
12
13

INPUT/OUTPUT

Input/Output SPEC

SYMBOL

DC 5V
GND
DC 5V
GND
REMOCON
REF ERR-P3
REF ERR-P2
REF ERR-P1
GND
REF ERR-P0
DC 5V
N.C
GND
TXD-ENABLE
CS0
CS1
DATA 0
DATA 1
DATA 2
DATA 3
DATA 4
DATA 5
DATA 6
DATA 7
N.C

CON4

CON5

CON6

CON7

Input/Output SPEC

SOUND-L

GND

SOUND-L2

SOUND-R1

GND

SOUND-R2

SOUND-R IN

GND

SOUND-L IN

GND

2
3

SOUND-R OUT
O

GND

SOUND-L OUT

AC 220V(L)

2
3

- 105 -

INPUT/OUTPUT

N.C
AC 220V(N)

DIGITAL PARTS MANUAL
3. HARDDISK
3-1. Function
This is the program storage device for the Digital Section of the Internet Refrigerator

3-2. Outline Diagram
HARDDISK
Windows Certification Label

Operation Classification Chart

Production Date

Operation
Classification

HDD
VERSION

MODEL NAME

R-D732GRS

SPEC
TV

NETWORK

SWITCH
VERSION

KOREA

NTSC

STANDALONE

VER 1.0

GR-D267FTU

ENGLISH

PAL-I

STANDALONE

VER 1.0

GR-D267FTU

SPAIN

NTSC

STANDALONE

VER 1.0

GR-D267DTU

ENGLISH

NTSC

STANDALONE

VER 1.0

GR-D267DTU

SPAIN

PAL-B/G

STANDALONE

VER 1.0

ATI M6 CHIPSET

GR-D267DTU

ENGLISH

PAL-B/G

STANDALONE

VER 1.0

ATI M6 CHIPSET

GR-D267DTU

ENGLISH

NTSC

STANDALONE

VER 1.0

ATI M6 CHIPSET

LANGUAGE

- 106 -

REMARK

DIGITAL PARTS MANUAL
3-3. Connecting Method to Connector upon replacement
When servicing, the hard drive, it is replaced with the program preinstalled and according to the Operation Classification
Chart.

Option Pin: Verifies MASTER location

projection + hole

IDE Connector

Power Connector

A
YL : Yellow
BK : Black
RD : Red
VIEW-A

3-4. SPEC of parts
1. HARDDISK SPEC (3.5˝)
- MAKER: FUJITSU, MAXTOR, LG-IBM, SAMSUNG, WESTERN-DIGITAL
- Storage Capacity: Over 20GB
- Rotation Speed: Over 5,400rpm
- Ultra DMA 100 support (average seek time: 9.5ms under)

2. Operating Environment
- Operating temperature: 5°C[41°F] ~ 55 °C[131°F]
- Operating humidity: 8% ~ 80%

3. Storage Environment
- Storage temperature: -40°C[-40°F] ~ 60°C [140°F]
- Storage humidity: 5% ~ 85%

- 107 -

DIGITAL PARTS MANUAL
4. TV-TUNER
4-1. Function
After receiving and handling the video and audio signals through cable, it transmits the signals to the video input section of
the main controller.

4-2. Outline Diagram and INPUT/OUTPUT Structure
4-2-1. Outline Diagram

- 108 -

DIGITAL PARTS MANUAL
4-2-2. INPUT/OUTPUT Structure
CONNECTOR

VIDEO

PIN NO.

I/O

SYMBOL

GND

Output

AUDIO-L

AUDIO LEFT OUTPUT

Output

AUDIO-R

AUDIO RIGHT OUTPUT

GND

Input

12V

POWER

Input

GND

I/O

TXD

I/O

RXD

Input

GND

1,2

Output

TV OUT

TV VIDEO Signal Output

4-3. Specifications of parts
1. Operating Environment
- Operating temperature: -10°C[14°F] ~ 60°C[140°F]
- Operating humidity: 0 ~ 95% (under 35°C[95°F] condition)

2. Storage Environment
- Storage temperature: -25°C[-13°F] ~ 85°C[185°F]
- Storage humidity: 95% (under 35°C[95°F] condition)

- 109 -

DESCRIPTION

DIGITAL PARTS MANUAL
5. POWER SUPPLY
5-1. Function
This is the power supplying section for driving the main controller and hard disk.

5-2. Outline Diagram and INPUT/OUTPUT Structure
5-2-1. Outline Diagram
Section D

Connect to
Section A
Section E

Section A

- 110 -

DIGITAL PARTS MANUAL
5-2-2. INPUT/OUTPUT Structure

(1) Section D Input voltage SPEC

(2) VIEW-B Output Voltage SPEC

PIN NO

I/O

INPUT VOLTAGE RANGE

REMARK

PIN NO

I/O

VOLTAGE

OUTPUT VOLTAGE RANGE

COLOR

INPUT

90~264

NEUTRAL

Output

3.3

3.0 ~ 3.6

ORANGE

N.C

Output

3.3

3.0 ~ 3.6

ORANGE

LIVE

GND

BLACK

N.C

Output

4.85 ~ 5.15

RED

GND

BLACK

Output

4.85 ~ 5.15

RED

GND

BLACK

GND

GRAY

POWER-GOOD

Output

4.85 ~ 5.15

PURPLE

STANDBY

Output

10.8 ~ 13.2

YELLOW

Output

3.3

3.0 ~ 3.6

ORANGE

GND

BLACK

GND

BLACK

GND

BLACK

-5V

-4.75 ~ -5.25

WHITE

Output

4.85 ~ 5.15

RED

Output

4.85 ~ 5.15

RED

2
3

INPUT

90~264

4
5

F.G

✽ MAKER TYPE : DIOS70B-ABD
• Input voltage range : 1.5Kv/1min, 1.8Kv/sec
• Insulated resistance : over 10 Mohm

REMARK

- 111 -

BLACK
SKY-BLUE POWER S/W ON

DIGITAL PARTS MANUAL
6. LCD MONITOR
6-1. Function
After receiving the LCD video output from the main controller, this device outputs it to the LCD monitor

6-2. Outline Diagram

LCD Inverter
Connector
TMDS Cable
Connector

6-3. Specifications of parts
1. MAKER: LG PHILIPS
2. MAKER TYPE: LM151X3(B3AP)
3. 15.1˝ XGA TFT LCD SPEC
- Pixel Pitch: 0.300mm X 0.300mm
- Color Depth: 8-bit, 16,777,216 colors
- Luminance, White: 250cd/m2
- Power Consumption: 2.1W Logic / 9.7W CCFL
- Display Operating Mode: TMDS
4. Operating Environment
- Operating temperature: 0°C[32°F] ~ 50°C[122°F]
- Operating humidity: 5% ~ 90% (under 40°C condition)
- Storage Environment
- Storage temperature: -20°C[-4°F] ~ 60°C[140°F]

- 112 -

DIGITAL PARTS MANUAL
7. LCD INVERTER
7-1. Function
This device supplies the driving power for backlight inside the LCD.

7-2. Outline Diagram and INPUT/OUTPUT Structure
7-2-1. Outline Diagram

0Inverter PCB1

7-2-2. INPUT/OUTPUT Structure
CONNECTOR

PIN NO.

INPUT/OUTPUT

INPUT

SYMBOL

DESCRIPTION

CTRL

Dim. Adjust

GND

INPUT

ON/OFF

GND

INPUT

Vin

DC 12V±1V

INPUT

Vin

DC 12V±1V

CN2

OUTPUT

Lamp H1

High Voltage connection to high side of lamp.

CN3

OUTPUT

Lamp L1

Low Voltage connection to low side of lamp.

CN1

- 113 -

Power System Return (5V:ON, 0V:OFF)

DIGITAL PARTS MANUAL
7-3. Specifications of parts
1. Maker: LG Electronics
2. Inverter Type: NMC1507-02
3. Maker Type: 6632Z-1507B
4. Inverter SPEC
- Input Supply Voltage: DC 11~13V
- Input Current: 1.1A
- Input Power: 13.2W
- Output Voltage: 616Vrms
- Output Current: 9.0mArms
- Output Power: 12W (2 lamps total)
- Input Signal Voltage: -0.3V ~ 6.0V
5. Operating Environment
- Operating temperature: 0°C[32°F] ~ 60°C[140°F]
- Operating humidity: 10% ~ 85%
6. Storage Environment
- Storage temperature: -30°C[-22°F] ~ 80°C[176°F]

- 114 -

DIGITAL PARTS MANUAL
8. TOUCH SCREEN
8-1. Function
Transmits the coordinates from the contact on the touch screen to the touch screen controller.

8-2. Outline Diagram

8-3. Specifications of parts
1. Touch Panel SPEC (15.1˝)
- Analog Resistive (5-line resistance film type)
- Operating Voltage: DC 5V
- Resolution: 4,096 X 4,096 line
- Activation Force: 57 ~ 113g
- Surface Hardness: 3H

2. Operating Environment
- Operating Temperature: -10°C[14°F] ~ 50°C[122°F]
- Operating humidity: 0% ~ 90% (under 35°C condition)

3. Storage Environment
- Storage Temperature: -40°C[40°F] ~ 71°C[160°F]
- Storage Humidity: 240 hours in 90% (under 35°C[95°F] condition)

- 115 -

DIGITAL PARTS MANUAL
9. TOUCH CONTROLLER
9-1. Function
After receiving and processing the touch coordinates from the touch screen, it transmits this information to the main
controller

9-2. Outline Diagram and INPUT/OUTPUT Structure
9-2-1. Outline Diagram

9-2-2. INPUT/OUTPUT Structure
CONNECTOR

PIN NO.

INPUT/OUTPUT

SYMBOL

INPUT

DCD

Data Carrier Detect

INPUT

DSR

Data Sct Ready

INPUT

RxD

Receive Data

INPUT

RTS

Ready To Send

INPUT

TxD

Transmit Data

INPUT

CTS

Clear To Send

INPUT

DTR

Data Terminal Ready

N/C

GND

Ground
PIN REMOVED

10
P4

DESCRIPTION

INPUT

+5V

DC +5V

GND

Ground

- 116 -

DIGITAL PARTS MANUAL
9-3. Connecting Method of Connector upon Replacement

9-4. Specification of parts
1. Operating Voltage: DC +5V ± 10%
2. Operating Current: 160mA (Peak 240mA)

- 117 -

DIGITAL PARTS MANUAL
10. CCD (CHARGE COUPLED DEVICE) CAMERA
10-1. Function
This changes the external video signal received through the lens into an electronic signal and transmits to main controller

10-2. Outline Diagram and INPUT/OUTPUT Structure
10-2-1. Outline Diagram

10-2-2. INPUT/OUTPUT Structure
CONNECTOR PIN NO. INPUT/OUTPUT

CN1

SYMBOL

DESCRIPTION

INPUT

+12V

DC +12V

GND

OUTPUT

VIDEO

CAMERA VIDEO OUT

GND

CAMERA VIDEO GND

OUTPUT

MIRROR

10-3 Specifications of parts
1. CCD Camera Module Specification
- Operating Voltage: DC 12 ± 1V
- Current Consumption: Max. 100mA ± 10%
- Image Sensor: 1/4 inch 270,000
- Effective Pixel: 512(H) X 492(V)
- Signal System: NTSC
- Horizontal Frequency: 15.734kHz
- Vertical Frequency: 59.94kHz
- S/N Ratio: 48dB min.
- Video Output: Analog Composite

2. Operating Environment
- Operating temperature:

- 118 -

CAMERA MIRROR

DIGITAL PARTS MANUAL
11. REMOTE CONTROL RECEIVER
11-1. Function
This device receives weak signal from the remote control, transfers then to a spherical wave and transmits to the remote
control processing section in the sub-controller.

11-2. Outline Diagram and INPUT/OUTPUT Structure

12. MICROPHONE
12-1. Function
Receives external sound signal, converts it to electronic signal and transmits the signal to the MIC input section of the main
controller

CON.MIC CMT-66 +WHITE -SHIELD
Shrinkage Tubeø1.5, 1.7 M/M
Shrinkage Tubeø3.5, 1.7 M/M

SHIELD
WHITE

12-2. Outline Diagram and INPUT/OUTPUT Structure

- 119 -

DIGITAL PARTS MANUAL
13. SPEAKER
13-1. Function
This device transfers and outputs the electronic signal amplified by the AMP in the sub controller into audible sounds.

13-2. Outline Diagram and INPUT/OUTPUT Structure.

13-3. Specifications of parts
- Power Rating: RMS 3W / Peak 5W
- Size: 110 X 42.5mm
- Total weight: 151g
- Impedence: 4ohm ± 0.6ohm
- Resonance Frequency: 180Hz ± 36Hz
- SPL: 84dB/W ± 2dB
- Response: F0 ~ 20kHz
- Distortion: 5% Max.

- 120 -

DIGITAL PARTS MANUAL
14. HDD SHERIFF
14-1. Function
The HDD SHERIFF is a program protecting the data stored in the hard disk. It can be booted in two modes.
- Supervisor Mode:
Mode which enables the modification of the contents in the C drive.
* When updating or modifying files, the new contents are reflected only if entered through the supervisor mode
- Protection Mode:
Mode which protects the C drive so that it returns to the original state when rebooted even after modifications have been
made.

14-2. Program Modification Method after entering in the Supervisor Mode

LG-Logo

Starting HDD Sheriff

: located on top of the refrigerator door.

Push Management SWITCH

Starting HDD Sheriff — Supervisor Mode Starting Windows 98...

: Enter the Supervisor Mode.

: Digital function ends and enters Windows.

Enters the Background screen of Windows

Press E with the Window key already being pressed

: Use after installing the keyboard to the USB 1 or 2 port
in the back of the refrigerator.

Carry out Modification work with the Windows Explorer frame open

: If it is open, it will continue to show even after rebooting.

After finishing work, close whole work frame

Reboot using the rebooting menu in the Windows system

Starting HDD Sheriff — Protection Mode Starting Windows 98

- 121 -

: Close after checking normal entry.

TROUBLESHOOTING FOR THE DIGITAL FUNCTION SECTION
1. TROUBLESHOOTING FOR THE DIGITAL FUNCTIONS SECTION
This section’s purpose is for finding causes and taking measures by checking related functions when there is something
wrong with the digital function section. The way to use this is to determine the real error through matching the symptoms
with the Error Diagnosis Flow Chart and taking measures according to the chart.
◆ How to read the Translation Flow Chart
Error Symptoms
Error
Symptom A

Contents to check

Measures

Error Translation
1
Operation 1
2
Verification 1
Yes
Operation 3

Operation 2
4

Yes

Verification 2
Yes

Measure 1
Measure 2

Verification 3
Measure 3

1) Select a symptom closest to the present current error. (Error Symptom A)
2) According to the selected error symptom, translate and take measures according to Steps 1,2, 3, 4, 5.
3) The progress should be done from top to bottom, from left to right.
4) Move in the direction of Yes or No at the verification stage and proceed accordingly.
5) Repeat this method until you reach a measure that solves the cause and go through the related operations and
verifications.
◆ Error Symptom Chart
1) Monitor does not operate normally.
- Monitor Error Symptom 1: Only LG-logo is displayed
- Monitor Error Symptom 2: Only stripes and white background are displayed
- Monitor Error Symptom 3: No display at all
2) The touch screen does not work.
3) Sound cannot be recorded.
4) Camera visual is not displayed.
5) Remote Control does not work.
6) There is no audio output of sound.
7) There is no TV output.
8) There is no output of TV sound.
9) The sensor for refrigerator errors does not work.

- 122 -

TROUBLESHOOTING FOR THE DIGITAL FUNCTION SECTION
Error Symptoms

Contents to check

Measures

Monitor does not
operate normally.

Check functioning of
monitor visual output section

There is no picture
output whatsovever.

Yes

Monitor Error Symptom 1:
Only LG-logo is displayed

Check input voltage
of hard disk connector
- Yellow : 12V
- Red: 5V
Yes
Is the input voltage
normal?

Yes
No

Check the input/output of
power supply and replace
if abnormal
HARDDISK replace

Monitor Error Symptom 2 :
Only stripes and white
background are displayed
Yes
Check status of 1. Main-Cont',
2.Monitor, 3.TMDS LCD
Yes

Monitor Error Symptom 3
Monitor Error Symptom 3

No
Reconnect connector

Yes
Is the connection
between Monitor
Joint and LCD connector
normal?

Yes

Is the connection
between back of the monitor
and the LCD connector
normal?
Yes

- 123 -

Replace Main-Cont'

TROUBLESHOOTING FOR THE DIGITAL FUNCTION SECTION
Error Symptoms

Contents to check

Measures

A
Monitor Error Symptom 3:
No display at all

Check power input/output

Is the power switch
on the top of the door
turned on?
LED location: ATX
power lead-in sector
Is the power LED
of the Main Cont'
on?
Yes

Is the power supply
input voltage normal?
(AC 90~264V)
Yes

Is the connection
between Main Cont'
TMDS LCD, Touch/INV
normal?

Is the power supply
output voltage normal?
(refer to I/O
structure)
Yes

Reconnect after checking
connection of input/output
No
Replace power supply

Replace Main Controller

No
Reconnect connector

Yes

Is the connection
between monitor joint
TMDS LCD, Touch/INV
normal?

Check for disconnected
cable for Main Cont'
Touch/INV connector
and reconnect

Yes

Is the LCD inverter
input voltage normal?
(refer to I/O
structure)

If there is still no normal
output after replacing
LCD inverter, replace
Main Cont'

Yes

- 124 -

TROUBLESHOOTING FOR THE DIGITAL FUNCTION SECTION
Error Symptoms

Contents to check

Measures

The touch screen
does not work.

Check operation
of touch screen
Check power input of
touch screen controller
LED location: behind touch screen
controller of the monitor section
Is the touch screen
controller LED lighted?

Yes

No
Is the touch
screen controller input
voltage normal?
(refer to I/O
structure)
Yes

Is the output voltage
of Sub Cont' CON1
normal? (DC5V)
Yes

Check Main Cont' power
switch connector
and reconnect
Check Monitor Joint
Touch Connector
and reconnect
Replace Touch Cont'

Does the LED go
out about 2 times
per second?

Reinitialize power of
digital section, and, when
checking operation, if LED
goes out abnormally,
replace Touch Cont.

Yes
When touching
the screen, does the
lighted state or brightness
of the LED change
about twice per
second?

After checking the connection
of the touch panel section,
if there are still issues after
reconnecting, replace
touch panel (refer to touch
connection diagram)

Yes

Is the Monitor
Joint section
connection normal?
(refer to I/O
structure)

Check connection by
referring to the touch screen
connection diagram
and reconnect

Reconnect Touch/Inv
in the Main Cont' section
and if it still does not work,
replace Main Cont'

Yes

- 125 -

TROUBLESHOOTING FOR THE DIGITAL FUNCTION SECTION
Error Symptoms

Contents to check

Measures

Sound cannot be
recorded.

Check the sound
recorded function
Check the microphone
connection

Is the connection
of the microphone connector
in the monitor section
normal?

Check monitor joint
connector and
reconnect

Check Main Con't
MIC IN connector
and reconnect

Yes
Is the connection
of the Main Cont' MIC IN
connector normal?
Yes
Replace MIC
Camera video is
not displayed.

Check the camera
operation function

Check the connection
of the camera connector

Is the input voltage
of the camera connector
normal? (refer to I/O
structure)

Check connection of
Main Cont' and Touch/INV
and reconnect

Check the Main Cont'
and CCD IN connector
and reconnect

Yes

Is the connection of
the Main Cont' and
CCD IN connector
normal?
Yes

Does the camera
in the monitor section
operate normally?

If it does not operate
normally even after
replacing the camera,
replacethe Main Cont'

Yes
END

- 126 -

TROUBLESHOOTING FOR THE DIGITAL FUNCTION SECTION
Error Symptoms

Contents to check

Measures

Remote Control
does not work.

Check the operation
function of remote control

Check the operation of MICOM
(Sub Cont') which processes
the remote control input.

1. Direct the remote control
to the receiver (monitor).
2. Push the main button once.

Does the Sub Cont'
LED switch on and
off once?
Yes

Is the Sub Cont'
CON1 input voltage
normal?(refer to I/O
structure)

Check the Main Cont'
Power switch Connector
and reconnect

Yes
Check the change in voltage
of Sub Cont' CON1 No. 4,5
(remote control signal input)
when pressing the remote
control button
Yes
Is there a change
in voltage?
(DC3V~DC5V)

Yes

Check the reconnection of
the remote control receiver
connector and check after
replacing the remote
control receiver

Replace Sub Cont'

Reconnect after
checking Main Cont'
parallel connector

- 127 -

TROUBLESHOOTING FOR THE DIGITAL FUNCTION SECTION
Error Symptoms

Contents to check

Measures

There is no output
of sound.

Check if the sound
output function works

Main Cont' Sound Out,
Check sound output Sound out, Install headphone
to terminal
Yes

Is there any output
of sound?

Replace Main Cont'

Yes
Is the connection
and I/O of Sub Cont'
CON 4,5,6,7 normal?
(refer to I/O
structure)

Reconnect after
checking Sub Cont'
CON 4,5,6,7 connector

Reconnect after checking
speaker section connector

Yes
Is the connection
to the speaker section
normal?
Yes
Check normal output
after replacing Sub Cont'
Yes

Is the output normal?

Yes
Is there a noise?

Yes

End
Insert properly
the Main Cont'
sound out connector
End

- 128 -

TROUBLESHOOTING FOR THE DIGITAL FUNCTION SECTION
Error Symptoms

Contents to check

Measures

There is no
TV output

Check TV function

Press TV Function
Set Channel
Auto Channel buttons

Does the Auto Channel
Search work?

Yes

Is the connection
to the Main Cont' TV Tuner
Connector normal?

If same symptom occurs
after replacing the TV Tuner,
replace Main Cont'

Yes
Is visual output
possible?
Yes

Is the connection
to the Main Cont' TV In
Connector normal?

Reconnect the Main Cont'
TV Tuner connector

Reconnect Main Cont'
TV In connector

TV Tuner Video Out (P3),
reconnect P2 connector
(refer to I/O structure

Yes
Is the connection
to the TV Tuner Video Out
(P3) connector normal?

Yes

If same symptom occurs
after replacing TV Tuner,
replace Main Cont'
End

- 129 -

TROUBLESHOOTING FOR THE DIGITAL FUNCTION SECTION
Error Symptoms

Contents to check

Measures

There is no output
of TV sound.

Check the TV function
Check connection of
TV Sound Connector
Is the
connection
between the Main Cont'
and TV Sound
Connector
normal?

Reconnect
the Main Cont' and
TV Sound In Connector

Yes
Is the
connection
between the TV Tuner
and Sound Out(P1)
connector
normal?

Reconnect
TV Tuner and Sound Out
(P1) connector.
(refer to I/O structure)

If same symptom
occurs after replacing
TV Tuner, replace
Main Cont'

Yes

The sensor for
refrigerator errors

Check the self-diagnosis
function of the refrigerator.

does not work.
Check the connection of the
refrigerator error sensor connector

Is the
connection
of the refrigerator MICOM
error sensor communication
connector
normal?

Reconnect refrigerator
MICOM error sensor
communication connector

Reconnect
Sub Cont' CON2

Yes

Connect Sub Cont'
CON2, is I/O normal?
(refer to I/O
structure)
Yes

If same symptom occurs
after replacing Sub Cont',
replace Main Cont' and
refrigerator MICOM

- 130 -

EXTERNAL EXTENSION PORT
1. EXTERNAL EXTENSION PORT

REF-POWER

1-1. TV
- Connect to cable TV.

1-2. LAN
- Connect Internet network cable

1-3. USB1,2
- Connect a keyboard when updating or revising programs in the digital section of the internet refrigerator
- To use an Internet network cable, install the additional software provided by ISP (Internet Service Provider)
✽ Software Installation Method
(1) Connect a USB Type CD-ROM to USB port 1.
(2) Reboot the digital section by pushing the reset switch.
(3) Enter the hard disk safety device in the supervisor mode.
(4) The CD-ROM drive is set as drive E in the Windows Explorer. Carry out the software addition work.

1-4. COM1
- Use when connecting the home network device.

1-5. COM2
- Use when connecting external modem.

1-6. REF-POWER
- Use when refrigerator power is off.

- 131 -

HOW TO DISASSEMBLE AND ASSEMBLE(DIGITAL SECTION)
1. TOP COVER PART
1-1. Main Controller Part

Unscrew two point.
● Disassemble after disconnecting Main Controller
connections 1~16.
●

6
5

4
3
2

1
15

1-2. Sub-Controller, Deco Case Part
●

Disassemble after disconnecting 1~7.

4
3
2
1

132

HOW TO DISASSEMBLE AND ASSEMBLE(DIGITAL SECTION)
1-3. TV-Tuner Part
●

Disassemble after disconnecting 1~4.

4
2
1

1-4. Hard Disk Part
Unscrew 1 point.
● Disassemble after disconnecting 1~2.
●

133

HOW TO DISASSEMBLE AND ASSEMBLE(DIGITAL SECTION)
1-5. Power Supply Part
Unscrew 4 points.
● Disassemble after disconnecting 1~2.
●

1-6. Sub-PCB Part
●

Disassemble after disconnecting 1~6.

3
5
4

1-7. Ref-Door Part
Disassemble DECO CASE after disconnecting 1~4.
Disassemble COVER-S disconnecting 5~10.
● Disassemble HINGE COVER after unscrewing 11.
● Disassemble the socket only when both sides
are being pressed in.
● Disassemble , , , , .
● Disassemble REF-DOOR after disconnecting
HINGE.
●

●

6
1

10 9
4

134

7 8

HOW TO DISASSEMBLE AND ASSEMBLE(DIGITAL SECTION)
2. MONITOR PART
1. Disassemble Monitor Cover, Frame LCD.

2. Disassemble Bracket after unscrewing.

3. Disassemble MONITOR after pulling out at bottom.

4. Unscrew No1, 2.

5. Disassemble Support Housing.

6. Disassemble Monitor after removing Connecters A,
B, C.

C B
A

135

EXPLODED VIEW
FREEZER DOOR PART

200A

202A

206C

210B

205F
210A

205G

210C
205D

212A

210C

205G

212A

210C

205F

201A

203B
203A

- 136 -

EXPLODED VIEW
REFRIGERATOR DOOR PART

230A

241A
241B
206D
232A
147C
234A

147B
147A
205F
240A
205G
264B

264A

205D

240B
243B

243A

242A
240C
205G
243A

233B

242A
205F

240C

- 137 -

233A

231A

EXPLODED VIEW
FREEZER COMPARTMENT

270A

271B
271A
137C

137B

136C

136D

403A

402A

136B
136A

120B

135A

120B
120B
400A
120B

128A
302A
401A

128B

130A

128C
408B
128D

120A

120A
320A
120A

320B

272A
320A
102A

320B

103A

125A
408A
137B
135B

105B

312A
105D

105A

408C

- 138 -

126A

EXPLODED VIEW
REFRIGERATOR COMPARTMENT

142A

141B

143A

142C
143A

146A

270B
171A

271B

141A

271A

171B

115A

116A
408B

141B

115B

143A

410A

152A

141C

402A

170A
401A

152A

150A

141B
145A

142A
143A

151B
145A

150B

151A

142C
143A
176A
176B

401B

175A

272B
177A
176C

161A

102A

177B

103A

161B
162A

162B

- 139 -

160A

EXPLODED VIEW
DISPENSER PART

277A

278A

278C
402C

278B

276A

275A

278F

278E

405A
275D
278D

276B

401C
275C
275B

281A

280D
501A

280E

279D
280C
280B

280A

279B
279F
279C

279A

- 140 -

EXPLODED VIEW
ICE & WATER PART

622A
616E

616D

623A

404A

619A

612A
612C

600A
612B

610A
611B

607A
602A

611C

605A

604A
611A

616C
620A

601A 603B

620A

510B
616B
603A
615A
617A
613A

621B

614A

606A

- 141 -

404B

EXPLODED VIEW
MACHINE COMPARTMENT

502A

502B
303A

303B
304A

303C

303D
313A

300A

310B

307A
306C

307A
317A
301A
317B

308B

104A
306A
104B
310A

305C
309C
403B

305B

309B

309A

308C

308A

305C
305B

- 142 -

305A

EXPLODED VIEW
SPEAKER & MONITOR PART
721A
720D
520D

720A
723A
720D

720D
721A
406B
520F

720B

803A

822A

520G
823A

800A

804A

821C
821B
823B
821D
825A
820A
822B

821C

521A
820D

823B
821B
821A
821A

722A

820E
828A
827A

820C

824A

802A

820B
820F

268A

- 143 -

DIGITAL PART COMPONENTS

714A
713A

711A

500A

709A

718A

716A

708A

704A

- 144 -

705A

701A

710A

407A
712A
7B

707A

706A

715A

702A

- 145 -

P/No. 3828JD8454C

OCT., 2002 Printed in Korea

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EXIF Metadata provided by EXIF.tools

LG Ref LRSPC2661xx Service Manual

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