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User Manual: LCD TV LG 42SL80 - Service manuals and Schematics. Free.

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1080P
Direct View LCD

42SL80

Original February 11, 2010
Updated May 04, 2010

OUTLINE
42SL80
Section 1
Contact Information, Preliminary Matters, Specifications,
LCD Overview, General Troubleshooting Steps,
Signal Distribution, Disassembly Instructions and Voltages
Section 2
Circuit Board Operation, Troubleshooting of :
• Switch mode Power Supply
• Two Inverter Boards
• Main Board
• T-CON Board

P-DIM (Digital Dimming) Routed from the Main
board to the T-CON to the Ballast.

• Ft Control Board

2

February 2010

LCD DV

42SL80

Overview of Topics to be Discussed

42SL80 LCD Direct View Display
Section 1
This Section will cover Contact Information and remind the Technician of Important Safety Precautions for
the Customers Safety as well as the Technician and the Equipment.
Basic Troubleshooting Techniques which can save time and money sometimes can be overlooked. These
techniques will also be presented.
This Section will get the Technician familiar with the Disassembly, Identification and Layout of the LCD
Display Panel.
At the end of this Section the Technician should be able to Identify the Circuit Boards and have the ability
and knowledge necessary to safely remove and replace any Circuit Board or Assembly.

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February 2010

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42SL80

Preliminary Matters (The Fine Print)

IMPORTANT SAFETY NOTICE
The information in this training manual is intended for use by persons possessing an adequate background in
electrical equipment, electronic devices, and mechanical systems. In any attempt to repair a major Product,
personal injury and property damage can result. The manufacturer or seller maintains no liability for the
interpretation of this information, nor can it assume any liability in conjunction with its use. When servicing this
product, under no circumstances should the original design be modified or altered without permission from LG
Electronics. Unauthorized modifications will not only void the warranty, but may lead to property damage or
user injury. If wires, screws, clips, straps, nuts, or washers used to complete a ground path are removed for
service, they must be returned to their original positions and properly fastened.

CAUTION
To avoid personal injury, disconnect the power before servicing this product. If electrical power is required for
diagnosis or test purposes, disconnect the power immediately after performing the necessary checks. Also be
aware that many household products present a weight hazard. At least two people should be involved in the
installation or servicing of such devices. Failure to consider the weight of an product could result in physical
injury.

4

February 2010

LCD DV

42SL80

ESD Notice

(Electrostatic Static Discharge)

Today’s sophisticated electronics are electrostatic discharge (ESD) sensitive. ESD can weaken or damage
the electronics in a manner that renders them inoperative or reduces the time until their next failure.
Connect an ESD wrist strap to a ground connection point or unpainted metal in the product. Alternatively,
you can touch your finger repeatedly to a ground connection point or unpainted metal in the product. Before
removing a replacement part from its package, touch the anti-static bag to a ground connection point or
unpainted metal in the product. Handle the electronic control assembly by its edges only. When
repackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.

Regulatory Information
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a residential installation. This equipment generates, uses,
and can radiate radio frequency energy, and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate
the receiving antenna; Increase the separation between the equipment and the receiver; Connect the
equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the
dealer or an experienced radio/TV technician for help.

5

February 2010

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42SL80

LCD Direct View Overview
Safety and Handling Regulations
1. Approximately 20 minute pre-run time is required before making any picture performance
adjustments from the Menu.
2. Refer to the Voltage/Current silk screening on the Switch Mode Power Supply.
3. C-MOS circuits are sensitive to static electricity.
Use caution when dealing with these IC and circuits.
4. Exercise care when making voltage and waveform checks to prevent costly short circuits
from damaging the unit.
5. Be cautious of lost screws and other metal objects to prevent a possible short in the
circuitry.

Checking Points to be Considered
1. Check the appearance of the Replacement Panel and Circuit Boards for both physical
damage and part number accuracy.
2. Check the model label. Verify model names and board model matches.
3. Check details of defective condition and history. Example: Oscillator failure dead set, etc…

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February 2010

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Basic Troubleshooting Steps
Define, Localize, Isolate and Correct
Look at the symptom carefully and determine what circuits could be causing
•Define
the failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and
check for possible overheated components. Capacitors will sometimes leak dielectric material
and give off a distinct odor. Frequency of power supplies will change with the load, or listen for
relay closing etc. Observation of the front Power LED may give some clues.
•Localize
After carefully checking the symptom and determining the circuits to be
checked and after giving a thorough examination using your senses the first check should
always be the DC Supply Voltages to those circuits under test. Always confirm the supplies
are not only the proper level but be sure they are noise free. If the supplies are missing check
the resistance for possible short circuits.
•Isolate
To further isolate the failure, check for the proper waveforms with the
Oscilloscope to make a final determination of the failure. Look for correct Amplitude Phasing
and Timing of the signals also check for the proper Duty Cycle of the signals. Sometimes
“glitches” or “road bumps” will be an indication of an imminent failure.
•Correct
The final step is to correct the problem. Be careful of ESD and make sure to
check the DC Supplies for proper levels. Make all necessary adjustments and lastly always
perform a Safety AC Leakage Test before returning the product back to the Customer.

8

February 2010

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42SL80

42SL80 PRODUCT INFORMATION SECTION

This section of the manual will discuss the specifications of the
42SL80
LCD Direct View Display
9

February 2010

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42SL80

42SL80 Basic Specifications
• TruMotion 240Hz
• Intelligent Sensor Mode
• Full HD 1080p HD Resolution
• 150,000:1 Dynamic Contrast Ratio (Brightness 500 cd/m2)
• 2.2ms Response Time (Gray To Gray)
• 500 cd/m2 Brightness
• Wide Color Gamut
• Super IPS Panel
• Wide Viewing Angle (178º / 178º)
• XD Engine®
• 24p Real Cinema
• ISFccc® Ready
• Picture Wizard
• AV Mode II (Cinema, Sports, Game)
• 60,000 Hour Panel Life (typical)
• NTSC/ATSC Tuners with Clear QAM
• 2 HD Component Video Inputs
• 2 Composite inputs
• 1 Digital Audio Out
• USB 2.0 (JPEG, MP3, MP4, Divx)
• PC Connectivity (D-Sub 15pin)

10

February 2010

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42SL80

Basic Specifications (LOGO Familiarization)
Full HD 1080p Resolution
Displays HDTV programs in full 1920 x 1080p
resolution for a more detailed picture.

11

February 2010

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42SL80

Remote Control Familiarization

p/n MKJ61841701

TOP PORTION

BOTTOM PORTION

12

February 2010

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42SL80

Accessing the Service Menu
To access the Service Menu.
1) You must have the Service
Remote. p/n 105-201M
2) Press “In-Start”
3) A Password screen appears.

Note: A Password is required
to enter the Service Menu.
Enter; 0000

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February 2010

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42SL80

Rear and Side Input Jacks

Side Input Jacks

Rear Input Jacks

Side A/V Input

Main Board
Orientation
Side AV

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February 2010

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42SL80

42SL80 Product Dimensions
42LS80 Dimensions

There must be at least 4 inches of Clearance on all sides
39.3/8"
1000mm
7-7/8"
200mm

Wattage
Average 210W
Stand By 0.36W

6.11/16"
170mm

15.¾“
400mm

24.1/2”
622.3

12.1/4”
31.15mm

19.11/16"
500.06mm
27.1/8"
688.34mm

1.13/16"
4.572mm

Model No.
Serial No.
Label

7-7/8"
200mm

Center

Model No.
Serial No.
Label

7-7/8"
200mm

10.1/16"
255mm

Remove 4 screws to
remove stand for
wall mount

2-5/8"
66.04mm
Weight without Stand: 41.2 lb
Weight with Stand: 52.2 lb

21.7/8"
500mm

15

11.5/16"
287.02mm

DISASSEMBLY and TROUBLESHOOTING SECTION
This section of the manual will discuss Disassembly, Layout and Circuit
Board Identification, of the 42SL80 LCD Direct View Television.

Decorative Cap
(If Installed)
Must be removed
To take back off.

The Stand must be
assembled when TV first
received out of the box.

Upon completion of this section the Technician will have a better
understanding of the disassembly procedures, the layout of the
printed circuit boards and be able to identify each board.

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February 2010

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42SL80

Removing the Back Cover

The Stand does not need to be removed
Remove the 19 screws indicated.
Pay attention to the size and type of screw
as there are many different types.
Putting in the improper screw when
reassembling may Cause damage.

The top two stand screws
Need to be removed, but
Not the bottom two screws.

If the customer has installed the
decorative Plastic Cap, it must be
removed before the back will come off.

Warning: The stand base is
“Glass” be careful, it will break.

17

February 2010

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42SL80

Circuit Board Layout

Inverters p/n EAY60750201
p/n EAT60667401

INVERTER A

INVERTER B
T-CON

LVDS

MAIN

p/n EAY58470001

LVDS

SMPS
p/n EBR63774601

FRONT CONTROL (IR)
p/n EBR63322103

SIDE
A/V

KEY BOARD
p/n EBR63609903

Main
Power Switch

Invisible Speakers
EAB60866701

Invisible Speakers
EAB60866701

AC Input

18

February 2010

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42SL80

42LS80 Connector Identification Diagram

CN5

T-CON
CN3 CN1

INVERTER

CN4

TFT Panel
INVERTER

CN2

MC1

P204

SC1

P205 P201

Black
CN201
CN2
CN203

CN3
CN1

POWER
SUPPLY

P400 P800

P801

P1000
P300
CN5

P101
L

N/C
P803

MAIN
BOARD

CN205

P100

SK100

P101

LN

AC In
P101

FRONT IR
P100

Speakers (Front Right)

J2
Front Keys

Main Power
Switch

A/V IN

Speakers (Front Left)

Front “Soft Switch” Keys

19

Black

Power Supply Board Removal
P204 to Inverter A
P204

P205

P201

Disconnect P201, P205,
P204, P101 and AC In
SK100.

P201 to Main
P205 to Inverter B

Remove the 6 screws
indicated by the arrows.

Caution: Be careful when
touching the back side of
the Power Supply as
some capacitors can still
hold a charge.
To Main Power Switch

P1
01

SK100 AC In
0
10
K
S

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February 2010

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42SL80

Main Board Removal
Disconnect
P100, P300,
P400, P800,
P801
Remove the 4
screws
indicated by
the arrows.

Flip the locking tabs upward, pull the LVDS ribbon up and out

P800

To
SMPS

P801

P400

P1000

To
SPKs

Remove any tape holding
down any cables.

P300

NOTE: Be sure to check on
top and behind the
Micro/Video Processor IC.
Look for Chocolate
(Heat Transfer Material).
Be sure to transfer to new
Board if present.

To A/V
Board
P100

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February 2010

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42SL80

Removing the T-CON Board (1 of 2)
Remove the LVDS Connectors CN1 and CN2

Press
In

Be careful with the tabs.
They are fragile and will break.
Rock the connector side ways while
pulling the cable out.

Press
In

Remove the 3 Screws in the T-CON shield.

There is a small
lip at the top of the
shield, pull straight
out slightly to
remove.

22

February 2010

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42SL80

Removing the T-CON Board (2 of 2)
Flip the Locking Mechanism upward on CN4 and CN5 to release the LVDS cables to the Panel.

Flip
Downward

Flip
Downward

Pull out (CN3)

T-CON SERVICE POSITION
Remember, these two screws have to be replaced in the board
if the TV is to be run with the T-CON shield removed.

Pull Out

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February 2010

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42SL80

Inverter A Removal

Be careful not to drop these screws.

Remove 4 screws.

p/n EAY60750201
Includes both Inverters

To
Backlights

2
CN

To T-CON
CN3

Disconnect
CN1, CN2,
CN3 and
CN5

To Inverter B
CN1

To SMPS

CN5

24

February 2010

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42SL80

Inverter B Removal

Be careful not to drop these screws.

Remove 4 screws.

p/n EAY60750201
Includes both Inverters

To
Backlights
To SMPS
CN201
CN203

To Inverter A

Disconnect
CN201,
CN203 and
CN205
CN205

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February 2010

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POWER SUPPLY SECTION

p/n EAY58470001

This set utilizes a Switch Mode Power Supply.

Input Voltages: AC
Stand-By Output Voltages:
• +5V (Stand By 5V) to the Main.
Run Output Voltages:
• +5V (Stand By 5V) to the Main
• 12V to the Main
(Video Processing, Tuner B+
and T-CON B+)

• 24V to the Main
(Audio B+)

• 24V to both Inverters

Run Input Commands from Main:
• PWR-ON (Relay On Command)
Brings the SMPS out of Stand-By

• INV-ON (In and Out to the Ballast)
This line also called “I-C”
Turns on the Backlights

26

February 2010

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42SL80

Power Supply (Main Power Switch Type 1) Location
There are three types of Main Power switch used in LG televisions.
Type 1: Shuts off AC to the Power Supply.
Type 2: Opens ground to the front IR board. (Stand-By 5V Remains, the Main board stays alive).
This prevents any activity of the IR or the Key Board. When the Switch is opened, a line called Power Key pulls up high
when ground opens. When the switch is closed, this same line called Power Key feeds back to the Microprocessor and the
Micro. Turns on the Power.
Type 3: Opens ground to the front IR board. (Stand-By 5V turns off, the Main board is dead).
This prevents any activity of the IR or the Key Board. When the Switch is opened, a line called Power Key pulls up high
when ground opens. This line feeds back to the Main board and from there it routes to the Power Supply. The high tells the
Controller chip to turn off STBY-5V. When the switch is closed, this same line called Power Key now goes high and feeds
back to the Power Supply and tells the controller chip to turn STBY-5V on.

If the TV won’t come on, be sure to check the Main
Power Switch before assuming a failure has occurred.
This switch breaks AC to the SMPS.

MAIN POWER SWITCH LOCATION
Type 1
(Bottom Left Side viewed from rear)

27

On

February 2010

Off

LCD DV

42SL80

Power Supply (SMPS) Board Layout

F1
3.15A/250V
STBY 170V
Run 388.5V
From Hot
Gnd

P101
To
Main
Power
Switch

Hot Ground
Shock
Hazard

SK100
AC IN
L
N

28

February 2010

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42SL80

42SL80 Power Supply Start Up Sequence
Primary side fuse: POWER
Stand-By 170V
Run 388.5V (Hot Gnd)

1

AC In

Bridge
Stand
By 5V Reg

No AC
Det in
this
model

6

2

6

24V

Power On

6

6
24V
Audio

12V Video
Processing

12V

CN3

CN1

Inverter A
INV
On

10

12V

CN4

3.3V, 26V, -5V, 16V
To Panel
3.3V, 26V, -5V, 16V

8 Video

CN5

7 Voltages developed by U5
On T-CON

7
LVDS
Video

P800
Q408
LVDS
12V
Switch

PWM-DIM
Digital 10
Dimming

Cust Menu for
Backlight
and
Picture Content
Manipulate P-DIM

Tru-Motion
9
LVDS Video

7

8

10 Manipulates
Backlights

9

MAIN BOARD

CN4

CN3

12V LVDS

8

CN203
INV On

PWM-DIM

Video
On LVDS cables

Inverter On

5V Q408
Switch

4

8

Tuner B+

Reset
Generator

6

P400
Reg
For
Micro

3

8

Inv
On

Relay On

IC603

6

T-CON Board
RL_ON

Other Circuits
5V General
And 5V

Inverter On
Starts the Inverters

12V 24V

At point 4 TV is in
Stand-By state.
Energy Star compliant.
Less than 1 Watt

6

10

P203

12V/24V
Regulators

Inverter B

Sync

6

Stand
By 5V

3

6

CN101
24V

24V B+ for the Inverters

P201

IC406
3.3V

P205

Power (RL_ON)
On

Inv On/Off
LVDS Panel Control
Microprocessor IC600
Also Video Processor

P801
P1000

5

Ft IRKey

Soft Touch Key

Remote or Power Button Key
29

To Panel
Backlights

Main
Power
Switch

SUPPLY (SMPS)

47LH85 P400 on Main Board to SMPS P201 Turn On Circuit
L411

P800
1

L419

12V_TCON

2

To
T-CON

Panel Power

3
4

SMPS

n/c
PWR
Gnd
Gnd
Gnd
Gnd

5.2V

1
2

n/c
PWR On
Gnd

3

4

Gnd

4

5

Gnd

5

6

Gnd

6

7

5.14V

7

8

5.14V

8

9

5.14V

9

10

5.14V

10

Gnd

11

12

Gnd

12

13

11.9V

13

14

11.9V

14

Gnd

15

16

Gnd

16

17

24.7V

17

18

24.7V

18

19

n/c

19

Gnd 15
Gnd
24V
n/c
I-C
A.DIM
ERROR
n/c
P-DIM

4.3V

20

20

1.6V

21

0V

24

CN203

1

INVERTER B

3

6V

7

R450
560Ω

R412
0Ω

C421
15pF

C407
C412
100uF
L402

0Ω

20K

100Ω

INV ON/OFF

R787

IC406

C400
22uF

R418
3.3KΩ

+5V General

Duty 2

24

n/c

11

Panel Control

R426
10KΩ

Video
Processor
G5 GPIO 136

C430
0.1uF R414

R430 0Ω

R422
10KΩ

R713
100Ω

100Ω

R774
100Ω

Inverter On/Off
Error Out
E8 GPIO 97

n/c

9

Micro B+
Multiple Pins

GPIO137 H5

Q401

+24V

E5 GPIO 134
Relay On

IC600
Mstar

+3.3V ST

R427 4.7KΩ

R726

L403

C409
1uF

A-DIM (Analog Dimming) Fixed Value.

CN3
Duty 1

+3.3V_ST

2

1

C405
0.1uF
C425
C427
68uF

L407

RL_ON

0Ω

3

Power
On/Off
F6 GPIO 185

R792

100Ω

5V_ST

+12V
C408
47uF

R434
0Ω

5V_ST

Q400

R420
0Ω

R437 10KΩ

0.2V R442 0Ω
R449 10KΩ

R421 R425 R431

L405

0V

5.2V

Q406 0.6V

2

R783
10KΩ

Q405

0.6V

R455 47KΩ

1

L418

PWR ON

23

PWM-DIM is not used
Inverter B
Processes P-DIM

4

+3.3V_ST

Q407

22

n/c

23

5
8

+5V General

21

0V

22

3

2

3

Gnd 11
Gnd
12V

+5V

1

4.9V

6

+12V

R454 47KΩ

L417

MAIN PWB
P400

P201

Q408

CN2
Inverter A
Processes P-DIM

INVERTER A

2
3

CN3
Scan 1
Scan 2

2
3

CN1

30

1.2K

R843
8

AA13 PWM3
A-DIM

P800

T-CON (UC1)
Processes P-DIM

T-CON

PWM 3

44
0Ω

R725 PWM 2
1.2K

P-DIM
AB12 PWM2

R775
100

Power Supply (SMPS) Board Operational Troubleshooting
Power Supply Troubleshooting
AC voltage is supplied to the Power Supply at Connector SC100. This set does not use AC Detect.
The AC input generates a Hot Ground primary power supply that runs in two states, Stand-By (170) and
Run (388.5V) measured at Fuse F1 from Hot Ground. This primary voltage develops all other voltages
that are output from the SMPS. During Stand-By, the 5 Volt Standby (5V_ST) should be present at
connector P201, Pins 7,8,9 or 10. If Missing remove AC Power and unplug Connector P201, apply AC
Power and recheck for presence of 5V_ST (5.1V to 4.7V). Loss of 5V_ST would be a SMPS Failure. If
5V_ST returns, it would be an indication of a failure on the Main Board or possibly the Front Board (IR)
assembly. Suspect a possible short circuit loading the supply. Remember to observe the Front Power
Indicating LED this may save some time. A lit LED indicates the Stand-By 5V voltage is present
and the Microprocessor is communicating with the front LED driver IC!
The Main Board sends two commands to the Power Supply Board one being PWR_ON and the other is
INV ON. These two signals are used to control the SMPS turn on sequence. First the command PWR_ON
(Pin 2) also known as POWER ON, activates the Inverter voltages 24V and the 24V and 12V lines to the
Main board. The 2nd command is INV ON (I_C) (P201 pin 20). It is the Lamp Lighting Command Signal.
If either command (PWR-ON or INV-ON) is missing it will result in a no picture symptom and the backlights
will not turn on.
These voltages can not be easily checked using the normal “Stand-Alone” Power Supply check.
This Power Supply utilizes many different voltage sensing circuits that will prevent the usual procedure.
The Stand-By 5V to the Main Board MUST BE LOADED for the SMPS to stay on.
You can not just jump the PWR_ON command from 5V_ST like it was done before. Using a simple 12V
flashlight bulb from 5V_ST to Gnd. Will supply a sufficient load to run the SMPS stand alone.

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February 2010

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42SL80

TEST 1 Power Supply Board Low Voltage Test
AC Should not be applied at any time while
adding the light bulb, resistors or while
unplugging connectors as damage to the
circuit Board may occur.
•

The SMPS “MUST” be producing STBY 5V on either pin 7, 8, 9 or 10 (5V).

If 5V Standby is not being generated, the SMPS is defective and must be replaced.
There is no need to continue with the next test.
• Unplug P400 on the Main Board. Use Main Board P400 Side to insert the
light bulb and resistors.
TEST 1: LOW VOLTAGE TEST:
Step (A) Add a 12V Light Bulb (10W) between 5V_ST and Gnd. This Supplies a load on the 5V_ST line that will
allow the supply to be powered up one section at a time.
Step (B) Add a 100Ω ¼ watt resistor from 5V_ST to PWR ON and the 12V and 24V Run Lines will become active.
Connector P201 Check pins 13 and 14 for 13.3V. Check pins 17 and 18 for 26.2V.
Connector P205 Check pins 1 through 5 for 26.2V.
Connector P204 Check pins 1 through 5 for 26.2V.
Remove AC power.

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February 2010

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42SL80

TEST 2 Power Supply Board Backlight Test

TEST 2: BACKLIGHT TEST:
Leave the Light Bulb and the resistor that was
added in the previous steps A and B connected.
Step (C)
Pull the Connector CN3 from the T-CON board.
Add a 100Ω ¼ watt resistor from 5V Standby to I-C (Inverter On) pin 20.
Add AC Power, the Backlights should turn on.
Note: If they do not, confirm that the I-C line (Inverter On voltage) is sent out pin 12 of both P203 and P205 going to
each Inverter. If 24V and I-C are present on both Inverters, see the Inverter Section of this book.
Remove AC power and return all connectors to the correct location.
Note: Using the test above, Inverter B can not be run Stand-Alone. Inverter A can be run by removing Inverter B
CN201. But the Right side of the screen (as viewed from the front) will be brighter and the Backlights will blink.
If CN203 is removed, then Inverter A will not run.
If 24V and I-C are present on both Inverters, see the Inverter Section of this book.

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February 2010

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42SL80

Power Supply Connector P201 Voltage and Diode Check
P201

P201 "SMPS" to P400 "Main Board"
2

P-DIM Pin 24
is not used.
1

A-DIM
Pin 21
Fixed Voltage
I-C
Same as
Inverter
Control
On/Off

*

Stand By 5V

Label

STBY

Run

Diode
Check

P-DIM

n/c

n/c

Open

23

nc

nc

nc

nc

22

Err Out

0V

0V

Open

21

1

A-DIM

0V

1.67V

Open

20

I-C

0V

4.3V

Open

19

nc

nc

nc

nc

17-18

24V

0V

24.7V

0.42V

16

AGND

Gnd

Gnd

Gnd

15

Gnd

Gnd

Gnd

Gnd

13-14

12V

0V

11.9V

0.72V

11-12

Gnd

Gnd

Gnd

Gnd

7-10

*5.2V

5.14V

5.14V

Open

3-6

Gnd

Gnd

Gnd

Gnd

2

PWR on

0V

4.9V

1.6V

1

nc

nc

nc

Open

Pin

24

2

Pin 1
P201 Label

Diode Check taken with meter in Diode Mode with all Connectors Removed

34

February 2010

LCD DV

42SL80

Power Supply P204 to Inverter A CN1 Voltage and Diode Check
There are no Stand-By voltages.
P204 "SMPS" to CN1 “Inverter A"

Pin

Label

Run

Diode Check

1-5

24V

24.7V

0.42V

6-10

Gnd

Gnd

Gnd

11

A-DIM

1.6V

Open

12

I-C (INV On/Off)

4.3V

Open

13

PWM-DIM

3.40V

Open

14

Error

0V

Open

Pin 1

Diode Check taken with meter in Diode Mode with all Connectors Removed

35

February 2010

LCD DV

42SL80

Power Supply P205 to Inverter B CN201 Voltage and Diode Check
There are no Stand-By voltages.
P205 "SMPS" to CN201 “Inverter B"

Pin

Label

Run

Diode Check

1-5

24V

24.7V

0.42V

6-10

Gnd

Gnd

Gnd

11

A-DIM

1.6V

Open

12

I-C (INV On/Off)

3.45V

Open

Pin 1

Diode Check taken with meter in Diode Mode with all Connectors Removed

36

February 2010

LCD DV

42SL80

Power Supply Connector SK100 and P101 Voltage and Diode Check
Diode Check taken with meter in Diode Mode with all Connectors Removed

SK100 "SMPS" to AC IN
Pin

Label

1

L

2

N

STBY

Run

120Vac

P101 "SMPS" to MAIN POWER SWITCH
Diode Check

Pin

Label

OL

1

n/a

OL

2

n/a

AC Voltage Readings Across Pins 1 and 2
for STBY and RUN.

STBY

Run

120Vac

Diode Check
OL
OL

AC Voltage Readings for either pin 1 or pin
2 in STBY and RUN with one lead on
Neutral of SK101.
With the Main Power Switch Closed (On) AC flows.
When Open (Off) AC open and does not flow.

Bottom Left of SMPS

SK101

P100
To Main
Power Switch

AC In
From Main Neutral
Power Switch

37

Live

February 2010

LCD DV

42SL80

INVERTER A and B SECTION

Inverter A and B Boards
Each Inverter receives it B+ from the Switch Mode Power Supply. Inverter A
CN1 Pins 1~5 and Inverter B CN201 Pins 1~5. 24V is delivered when the
“Power On” command arrives at the SMPS.
The Backlights are turned on when the “Inverter On” command arrives. INVON is sent from the Main board through the SMPS to Inverter A CN1 Pin 12.
Then Inverter A sends the On/Off (Inverter On/Off) command to Inverter B via
CN3 to CN203 pin 7.
The Backlights are manipulated by the control signal
“P-DIM (Digital Dimming)” coming from the T-CON board via CN2 pins 2 and 3
to Inverter A CN3. Then the controller chip on Inverter A sends Duty 1 and
Duty 2 to Inverter B on CN205 pins 1 and 3.
The output of 1.2Kv is sent to three sections of the backlight behind the LCD
panel. These three sections are broken up as follows: The Top and Bottom
sections are tied together, each containing 6 bulbs (total 12). The Center
section has 13 bulbs. All total 25 bulbs.

38

February 2010

LCD DV

42SL80

EEFL Compared to CCFL (This set uses EEFL Bulbs)
Complex structure, High price
CCFL (Cold Cathode Fluorescent Lamp)

V

Simple structure, Low price
EEFL (External Electrode Fluorescent Lamp)
Starting
Voltage
and
Operating
Voltage

Starting
Voltage

Operating
Voltage

V

I

I

Wide Range for Operating Voltage

More Consistent Operating Voltage
Inverter
1

Top 6 Bulbs

Inverter
2

Center 13 Bulbs
A
Transformer
for every bulb.
Bottom 6 Bulbs

Complicated and more
expensive structure
Simple structure
Lamp manufacturing process
Lamp assembly structure

39

February 2010

Low Cost
Large number of Lamp
Drive by single inverter

LCD DV

42SL80

EEFL Compared to CCFL Electrodes
Key: Long Life Time

• For CCFL, Hg gas is consumed mainly near the internal electrode
• For EEFL, longer life time is expected because there is no internal electrode consuming Hg gas

40

February 2010

LCD DV

42SL80

General Backlight Information
Number of lamps “25”

Connection
board to
6 Bulbs

Inverter A

Inverter B

Connection
25
Bulbs
board
to
13 Bulbs

Connection
board to
6 Bulbs
Connection
board to
13 Bulbs

Ties Top
board with
bottom
board
Connection
board to
6 Bulbs

Ties Top
board with
bottom
board

To Backlights
Over 1.2KV

Connection
board to
6 Bulbs

To Backlights
Over 1.2KV

EEFL (External Electrode Fluorescent Lamp)
LOW COST Large number of lamps driven by a single inverter

41

February 2010

LCD DV

42SL80

Inverter A (Shield Removed) Layout

p/n EAY60750201
Includes both Inverters

To Top 6 bulbs
and Bottom
6 bulbs

Driver ICs

Center 13
bulbs

Driver FETs

Ballast
Transformers

CN2

To CN3 of T-CON

CN3

To CN203 of Inverter B

CN1

To P204 of SMPS

F1
12A/65V

CN5
To Backlights
Left Side

42

February 2010

LCD DV

42SL80

Inverter B (Shield Removed) Layout
To Top 6
bulbs and
Bottom
6 bulbs

Driver ICs

To P205 of SMPS

To CN3 of Inverter A

To Center
13 bulbs

CN201

F201
12A/65V

CN203

Driver FETs

Ballast
Transformers
p/n EAY60750201
Includes both Inverters

CN205
To Backlights
Right Side

43

February 2010

LCD DV

42SL80

42SL80 Inverter A & B Layout and Component Volatages
Pin
14

Label

STBY

STATUS

13

NC

12

ON/OFF

Run

Resistance

0V

0V

OPEN

0V

0V

OPEN

0V

4.3V

OPEN
OPEN

11

Vbr-A

0V

1.6V

6-10

GND

GND

GND

GND

1-5

VIN

0V

24.7V

OPEN

Label

STBY

Run

11

DUTY_M1

0V

10

GND

GND

GND

GND

9

DUTY_M2

0V

0.71V-2.4V

OPEN

8

FB_S1

0V

0.96V

2.9V

7

ON/OFF

0V

4.3V

OPEN

6

STB

0V

3.2V

OPEN

U1
U101

VREF

4

FB_M1

0V

1.0V

2.9V

3

SRT

0V

1.4V

OPEN

2

SS

0V

2.9V

OPEN

1.0V

1

CT_SYNC_IN

0V

1.5V

1.7V

35V
680
uF

Label

STBY

Run

Diode Check

4

GND

GND

GND

GND

3

SCAN 2

0V

0.67V-2.4V

OPEN

2

SCAN 1

0V

0.67V-2.4V

OPEN

0V

Backlights
at 100%

3.3V

OPEN

G

24.1V

G

0.73V

D

24.6V

D

20.4V

S

20.3V

S

GND

Q104/Q102

U301

CN2

35V
680
uF

C243

C208

35V
680
uF

35V
680
uF

- +

- +

Q104

Q102

D

D

G

Q106
D

G

S
S
G

Q2

G
S

S G

Q103
D

D

D

S

Q3

Q4

G
S
G

G
S

CN3

CN203

F1
65V/ 12A
D

D

D
F1
S 65V/ 12A

S

Q203

Q6

D

D

S

G
G
S

Q302

Q204 Q304

Q202

S
G

Pin

Label

1-5

VIN

6-10

STBY

Run

Resistance

0V

24.7V

OPEN

GND

GND

GND

GND

11

Vbr-A

0V

1.6V

OPEN

12

n/c

n/c

4.3V

OPEN

CN203 Connector "Inverter A" to CN3 "Inverter B"

- +

Q3/Q6

Q2/Q4

C8

- +

OPEN

Pin

CN201

C43

CN2 Connector "Inverter A" to CN3 "T-CON"

NC

U201

OPEN

5

1

CN201 Connector "Inverter B" to P205 "SMPS"

Do Not
Adjust

Resistance

0.71V-2.4V

0V

U201 & U301 are DC-AC
Inverter Control ICs

U101 & U1 are DC-AC
Inverter Control ICs

CN3 Connector "Inverter A" to CN203 "Inverter B"
Pin

Inverter B

Inverter A

CN1 Connector "Inverter A" to P204 "SMPS"

D

G S

Q206
D

D

S

G

Q208
D

G

S

S

G

G

Pin

Label

1

DUTY_S1

STBY
0V

0.71V-2.4V

Run

Resistance

2

GND

GND

GND

GND

3

DUTY_S2

0V

0.71V-2.4V

OPEN

4

FB_S1

0V

0.96V

2.9V

5

ON/OFF

0V

4.3V

OPEN

6

STB

0V

3.2V

OPEN

7

VREF

0V

1.0V

OPEN

8

FB_M1

0V

1.0V

2.9V

9

SRT

0V

1.4V

OPEN

10

SS

0V

2.9V

OPEN

11

CT_SYNC_IN

0V

1.5V

1.7V

Q303
D

Backlights
at 100%

CN1

Q106/Q103

Q202/Q204

Q203/Q206

G

24.1V

G

0.73V

D

24.6V

D

20.4V

S

20.3V

S

GND

Q302/Q304

Q306/Q303

G

21.7V

G

0.6V

G

21.7V

G

0.6V

D

24.6V

D

21.6V

D

24.6V

D

21.6V

24.8V

S

S

24.8V

S

Gnd

S
Backlights
at 0%

Gnd
Q3/Q6

Q2/Q4
G

26.9V

G

0.3V

D

24.6V

D

23.0V

S

23.1V

S

GND

Q104/Q102

T101

T201

T1

Backlights
at 0%

T301

Q106/Q103

Q202/Q204

Q203/Q206

G

26.9V

G

0.3V

D

24.6V

D

23.0V

S

23.1V

S

GND

Q302/Q304

Q306/Q303

G

27.0V

G

0.28V

G

27.0V

G

D

24.6V

D

23V

D

24.6V

D

23V

S

23.1V

S

Gnd

S

23.1V

S

Gnd

Backlights
at 100%
CN5 Connector "Inverter A" TO MC1 and Black "LCD Panel"
Pin

Label

1

TO MC1

1.2Kv

72 Ohms

2

TO BLACK

1.2Kv

72 Ohms

CN205

CN5

0.28V

Backlights
at 100%
CN205 Connector "Inverter B" TO "LCD Panel"

Run AC Resistance

44

OPEN

Pin

Label

1

TO SC1

Run AC Resistance
1.2Kv

72 Ohms

2

TO BLACK

1.2Kv

72 Ohms

Ballast Transformer Waveforms
6

FET Drivers

1

6

Primary

1

Both Inverters have
2 Drive Transformers.
They have the same
configuration.
Warning, secondary
is over 1.2Kv
Do Not Measure without
proper equipment.

Secondary

30V p/p 48kHz (5uSec)

29.2V p/p 48kHz (5uSec)
All Transformers Pin 1

All Transformers Pin 6

45

February 2010

LCD DV

42SL80

Ballast Transformer Noise Suppression Pads
Both Inverters have 2 Drive Transformers.
There is a rubber pad that covers both drive transformers on both A and B
Inverters. These pads reduce the vibration noise being generated from
these transformers, be sure to replace these.
Padding

Drive
Transformers

46

February 2010

LCD DV

42SL80

RF Prevention Shields behind the Inverters
Behind the Inverters are shields

Inverters A side

Inverters B side

The Shield on
Inverters A side
is adhered to
the panel.

The Shield on
Inverters B side
is adhered to
the panel.

Shield

Shield

47

February 2010

LCD DV

42SL80

42LS80 Inverters Turn On Circuit P400 on Main Board To Power Supply P201
INVERTER
A

CN3

11 Pins Carrying On/Off, Duty, Sync and
Drive signals. Receiving Error feedback.

POWER
SUPPLY

P205

P201

1~5

VIN
24V

12

1~5

4.3V
24.7V

12

1~5

20

24V

SMPS
Controler

24V
Reg

ERR

14
11

Ballast
Driver 1

Ballast
Driver 2

48K
Drive
signals
Output
FETs

0V
1.6V
Fixed

13
n/c

CN2
2
3

8

5V General

9 10

14

12V
Reg

Hi if Lamps do not light

11

A-DIM

13

P-DIM not
used

20

CN203 INVERTER
B

MAIN PWB

P700

IC600
Mstar

Stby 5V

P204

CN1
On/Off
INV On/Off

7

11 Pins Receiving On/Off, Duty, Sync and
Drive signals. Sending Error feedback.

Q401

INV On/Off

G5 Inverter On
GPIO136
E5 Relay On

4.82V
Q400

PWR

2

2

13

13

14

14

17

17

18

18

22

22

21

21

1.67V

24

24

n/c

GPIO131

For Circuit Details, see
P400 ON MAIN PWB TO
SMPS P201 TURN ON
CIRCUIT

2.86V
12V

ERR 0V

A-DIM (Analog Dimming)
Fixed Voltage 1.6V

PWM-DIM (PWM Dimming) Manipulates the Backlight Brightness via Customer’s
OSD, via the video processor IC400 and by the Intelligent Sensor. Darker Picture,
Darker Backlights to facilitate improved Contrast Ratio. 0.7V ~ 2.4V Range

Scan 1
Scan 2
SCAN 1 and SCAN 2 are manipulated by PWM-DIM (PWM Dimming)

Output
Transformers

1~5

24.7V
VIN
24V

ERROR 4th time this line
goes high, power shuts off.

5V_ST

24V

CN201

LVDS
Cable
2
3
CN3

E8

GPIO97

AB13

VBR-A
PWM-0

AB12

VBR-B
PWM-2

PWM-DIM
44

P800

8

CN1

UC1
T-CON PWB

Ballast
Driver 2

Ballast
Driver 1

48K
Drive
signals
Output
FETs
Output
Transformers

1.2kV
Out

1.2kV
Out

48

Power Supply Backlight Drive Signal Effects

Note:
Backlights will
attempt to fire 4
times. During these
attempts, the Error
line will change
from 5V to 0V.

PWM-DIM
manipulates
the Burst
Triangle
Oscillator in
the ballast
drive IC.

0V when lamp tries
to fire or is lit.
5V when the lamps
are not lit.
After 4 attempts, if
the Error Out line
returns to 5V, this
tells the Micro to
turn the set off.

A-DIM also
manipulates
the Burst
Triangle
Oscillator
But it is not
used.

49

February 2010

LCD DV

42SL80

Inverter A Connector CN1 and CN2 Voltage and Diode Check
There are no Stand-By voltages.

CN1
CN1 “Inverter A" to P203 "SMPS"

1
Pins 2/3
(Digital Dimming)
Can vary according to
the brightness level of
the video signal and the
OSD Backlight setting.
0.67V 0% to 2.4V
100%. Output from the
Video Processing chip
IC100 (Mstar) through
T-CON.

Pin

Label

Run

Diode Check

14

Status

0V

Open

13

n/c

0V

Open

12

On/Off

4.3V

Open

11

VRB-A

1.6V

Open

6-10

Gnd

Gnd

Gnd

1-5

VIN

24.7V

Open

Pin 13 PDIM
(Digital Dimming)
This pin is not used.

CN2 “Inverter A" to CN3 “T-CON"

Pin

Label

Run

Diode Check

1

Gnd

Gnd

Gnd

2

Scan 1

*0.67V~2.4V

Open

3

Scan 2

*0.67V~2.4V

Open

4

n/c

3.3V

Open

CN2

1

Diode Check taken with meter in Diode Mode with all Connectors Removed

50

February 2010

LCD DV

42SL80

Inverter A Connector CN3 Voltage and Diode Check
There are no Stand-By voltages.
CN3 “Inverter A" to P203 “Inverter B"
CN3

1

Pin

Label

Run

Diode Check

11

DUTY_M1

*0.71V~2.4V

Open

10

Gnd

Gnd

Gnd

9

DUTY_M2

*0.71V~2.4V

Open

8

FB_S1

0.96V

2.9V

7

ON/OFF

4.3

Open

6

STB

3.2V

Open

5

VREF

1.0V

Open

4

On/Off

1.0V

2.9V

3

SRT

1.4V

Open

2

SS

2.9V

Open

1

CT-SYNC-IN

1.5V

1.7V

Varies with PDIM

Varies with PDIM

Diode Check taken with meter in Diode Mode with all Connectors Removed

51

February 2010

LCD DV

42SL80

Inverter B Connector CN201 Voltage and Diode Check
CN201
There are no Stand-By voltages.

CN201 “Inverter B" to P205 "SMPS"

Pin

Label

Run

Diode Check

1-5

VIN

24.7V

Open

6-10

Gnd

Gnd

Gnd

11-12

N/C

1.6V

Open

Pin 11 and 12
are not used.
F201
24.7V Fuse

Diode Check taken with meter in Diode Mode with all Connectors Removed

52

February 2010

LCD DV

42SL80

Inverter B Connector CN203 Voltage and Diode Check
There are no Stand-By voltages.
CN203

CN203 “Inverter B" to CN3 “Inverter A"

Pin

Label

Run

Diode Check

1

DUTY_S1

*0.71V~2.4V

Open

2

Gnd

Gnd

Gnd

Varies with PDIM

Varies with PDIM

3

DUTY_S2

*0.71V~2.4V

Open

4

FB_S1

0.96V

2.9V

5

ON/OFF

4.3

Open

6

STB

3.2V

Open

7

VREF

1.0V

Open

8

FB_M1

1.0V

2.9V

9

SRT

1.4V

Open

10

SS

2.9V

Open

11

CT-SYNC-IN

1.5V

Open

Pins 1/3 Duty
(Digital Dimming)
Can vary according to
the brightness level of
the video signal and the
OSD Backlight setting.
0.67V 0% to 2.4V
100%. Output from the
Video Processing chip
IC100 (Mstar) through
T-CON.

Diode Check taken with meter in Diode Mode with all Connectors Removed

53

February 2010

LCD DV

42SL80

T-CON (TFT DRIVE) SECTION

LCD Controller Board
The T-CON IC UC1 receives from the Main Boards LVDS Video Signals at CN1 and CN2.
This is a Dual 12 Bit (24 pin) LVDS Video Signal which it processes into TFT Drive Signals
which are delivered through connectors CN4 and CN5 to the LCD TFT Panel.
T-CON B+: 12V is supplied to the T-Con Board on connector CN1 from the Main Board
P800 easily measured at fuse F1, (3A and 125V).
There is a DC to DC converter (U5) that creates;
(16V Measured at VDD). (26V Measured at pin 8 of U5).
(3.3V Measured at VCC). (-5V Measured at D9 top right leg).
These Voltages can also be measured at the ribbon connectors delivering signals to the
TFT panel
(CN4 26V pin 4, -5V pin 2, 3.3V pins 53, 54 and 16V pins 56, 57 and 58).
(CN5 26V pin 57, -5V pin 59, 3.3V pins 7, 8 and 16V pins 3,4 and 5).
See the 11X17 Foldout (Interconnect Diagram) for more details.
In the set the T-CON also receives the P-DIM voltage from the Main board on CN1 pin 8.
Then the Controller UC1 outputs P-DIM control signals now called Scan 1 and Scan 2 on
the CN3 connector, pins 2 and 3 to Inverter A CN2.

54

February 2010

LCD DV

42SL80

T-CON (TFT Drive) with (Shield Removed) Components Identified
p/n EAT60667401
-5V
26V

(VDD_LCM) Pin 3,4,5 16V
(VCC) Pin 7,8 3.3V

TO TFT MODULE

3.3V

(VDD_LCM) Pin 56,57,58 16V
(VCC) Pin 53,54 3.3V

16.3V

16.3V

(VGL) Pin 2 -5V
(VGH_M) Pin 4 26V

TO TFT MODULE

3.3V

CN4

1) Gnd
2) 1.8V
FL3 3) 3.3V
Gnd Protect

15) 3.3V
16) Gnd
17) Gnd
18) Gnd
19) 5.8V
20) 5.0V
21) 3.9V
22) 2.9V
23) 6.0V
24) Gnd
25) 2.2V
26) 0.3V
27) 2.2V
28) 6.9V

U12

C307
C308

U11

L2
3.8V P/P
9.97Mhz

C
3.3V

U10 1~4) Gnd

5) 0V
6) 3.3V
7) 3.3V
8) 3.3V

CN3

3.3V
Gnd
12V

2

3

(CN1) Pin 48-51

-5V
FL2

27V
D9
D7 -2.4V
20.5V
D10
14.25V
U5

26V
VGH_M

L1

Q1
B
E
2.78V 3.3V

F1 (12V)
125V / 3A

Gnd Protect
VGL

Gnd

U13

UC1

1
2

VCC
3.3V

T-CON BOARD
(TFT Driver)

R704
R705
R706

C302
C301

1) 6.9V
2) 13.7V
3) 15.7V
4) 13.7V
5) 13.0V
6) 12.0V
7) 10.9V
8) Gnd
9) 16.0V
10) 10.1V
11) 8.2V
12) 7.7V
13) 3.3V
14) 3.3V

C303
C304

C306
C305

CN5

D8

C744
R721

(VGL) Pin 59
(VGH_M) Pin 57

16V
VDD

U5 B+ 12V
16V

CN1

CN2

Warning:
T-Con PWB under shield. Be sure to reinsert screws before operating set with shield removed.

55

T-CON (TFT Drive) Board Checks

T-CON Board (Locations)

Check the Regulator for
Correct Voltage
Gnd

U11

1.8V

3.3V

F1

U10

1~4) Gnd
5) 0V
6) 3.3V
7) 3.3V
8) 3.3V

Check
Fuse
F1 (12V)

CN1

Check Fuse F1 for 12V
Voltage supplied from CN1
Pins 48, 49, 50, and 51.

56

February 2010

LCD DV

42SL80

T-CON (TFT Drive) Panel Voltage Development Checks

The development for the
voltages on the CN4 and CN5
connectors are shown here.
This is an excerpt from the
Interconnect diagram.
Panel voltages are outlined
in the rounded cornered
boxes.

57

February 2010

LCD DV

42SL80

T-CON Board Connector CN1 to Main Board Voltage and Diode Check
CN1 CONNECTOR "T-CON Board“ to P800 "Main"
Pin

Label

Run

Diode Check

Pin

Label

Run

Diode Check

48-51

12V T-CON

12.06V

3.18V

23

URSA_A-3

1.3V

1.1V

41

URSA_B-4

1.3V

1.1V

22

URSA_A+3

1.3V

1.1V

40

URSA_B+4

1.3V

1.1V

20

URSA_ACK-

1.2V

1.1V

39

URSA_B-3

1.3V

1.1V

19

URSA_ACK+

1.1V

1.1V

38

URSA_B+3

1.3V

1.1V

17

URSA_A-2

1.1V

1.1V

36

URSA_BCK-

1.1V

1.1V

16

URSA_A+2

1.2V

1.1V

35

URSA_BCK+

1.2V

1.1V

15

URSA_A-1

1.3V

1.1V

33

URSA_B-2

1.3V

1.1V

14

URSA_A+1

1.3V

1.1V

32

URSA_B+2

1.3V

1.1V

13

URSA_A-0

1.3V

1.1V

31

URSA_B-1

1.3V

1.1V

12

URSA_A+0

1.3V

1.1V

30

URSA_B+1

1.3V

1.1V

11

N/C

0V

Open

29

URSA_B-0

1.3V

1.1V

10

OPC_EN

0.6V

1.75V

28

URSA_B+0

1.3V

1.1V

9

N/C

0V

Open

27

N/C

0V

Open

8

PWM-DIM

*2.7V

1.3V

25

URSA_A-2

1.3V

1.1V

7

N/C

0V

Open

24

URSA_A+2

1.3V

1.1V

Pins 1, 18, 21, 26, 34, 37,
42, 43, 44, 45 and 46 are
all ground.
Pins 2, 3, 4, 5, 6 and 47
are all no connection.

Text in Blue are
LVDS video
signals.

CN1

*Pin 8 PWM-DIM 3.15V (Max 100%) to 0.6V (Min 0%)
Customer’s Menu Backlight setting.
Diode Check taken with meter in Diode
Mode with all Connectors Removed

See arrow on the T-CON
board CN1 indicating pin 1

58

February 2010

LCD DV

42SL80

T-CON Board Connector CN2 to the Main Board (Voltage and Diode Check)
CN2 “T-CON“ to P801 CONNECTOR "Main"
Pin

Label

Run

See arrow on the
T-CON board CN1
indicating pin 1

Diode Test

1-9

n/c

n/c

n/c

10

URSA-C+0

1.28V

Open

11

URSA-C-O

1.2V

Open

Pin

URSA-D+0

1.29V

Open

Label

Run

Diode Test

12

URSA-C+1

1.3V

Open

26

13

URSA-C-1

1.2V

Open

27

URSA-D-0

1.25V

Open

14

URSA-C+2

1.3V

Open

28

URSA-D+1

1.29V

Open

15

URSA-C-2

1.2V

Open

29

URSA-D-1

1.3V

Open

16

Gnd

Gnd

Gnd

30

URSA-D+2

1.3V

Open

17

URSA-CCK+

1.23V

Open

31

URSA-D-2

1.2V

Open

18

URSA-CCK-

1.23V

Open

32

Gnd

Gnd

Gnd

19

Gnd

Gnd

Gnd

33

URSA-DCK+

1.23V

Open

20

URSA-C+3

1.3V

Open

34

URSA-DCK-

1.29V

Open

21

URSA-C-3

1.2V

Open

35

Gnd

Gnd

Gnd

22

URSA-C+4

1.13V

Open

36

URSA-D+3

1.3V

Open

23

URSA-C-4

1.18V

Open

37

URSA-D-3

1.25V

Open

24

Gnd

Gnd

Gnd

38

URSA-D+4

1.4V

Open

25

Gnd

Gnd

Gnd

39

URSA-D-4

1.15V

Open

Gnd

Gnd

Gnd

40-41

CN2

Text in Blue are
LVDS video
signals.

Diode Mode values taken with all Connectors Removed

59

February 2010

LCD DV

42SL80

T-CON Board Connector CN3 to Inverter A (Voltage and Diode Check)
See arrow on the
T-CON board CN3
indicating pin 1

CN3 “T-CON“ to CN2 “Inverter A"
Pin

Label

Run

Diode Test

1

n/c

n/c

n/c

2

SCAN 1

0.67V~2.4V

Open

3

SCAN 2

0.67V~2.4V

Open

4

Gnd

Gnd

Gnd

CN3

Pins 2 SCAN 1 and 3 SCAN 2 (Digital Dimming)
Can vary according to the brightness level of the
video signal and the OSD Backlight setting.
0.67V 0% to 2.4V 100%.
P-DIM Output from the Video Processing chip IC100
(Mstar) and input on CN1 pin 8 T-CON.

Diode Mode values taken with
all Connectors Removed

60

February 2010

LCD DV

42SL80

MAIN BOARD SECTION
The Main board receives its operational B+ from the Power Supply via P400.
There are two LVDS cable feeds that go to the T-CON (TFT Driver) section. These carry the Dual 12
bit LVDS Video signals and the TruMotion 60Hz Dual 12 bit LVDS. These signals have already been
prepared for the T-CON board. The Main board also includes the Tuner, Audio and Audio/Video
inputs and selection circuits.
Input Voltages from SMPS.
STAND-BY
• STBY 5V pins 7~10

RUN
Stand By

For all other regulators except 12V/24V
and output to Ft. IR

• 12V pins 13 and 14
• 24V pins 17 and 18.

For Tuner Voltage (Dropped to 5V)
and output (Switched) for T-CON
For Audio Amplification
(Converted to 24V_Amp)

The Main board also develops several B+ sources on the board.
STAND-BY VOLTAGES
• 3.3V_ST Voltage_Stand By

For Microprocessor and output to Ft. IR

LVDS
• LVDS 12V

GENERAL
• 5V_General For Video Processing / DDRs
• 5V_EXT For Tuner Demodulator Low Voltage
Development

Not generated, but switched from the
12V arriving from the SMPS.

AUDIO
• 3.3V
• 1.8V_AMP

Amplifier (Audio)

TUNER and VSB CIRCUIT
• 9V For Tuner B+ Developed from 12V Input
Mstar IC600 Video and Micro Processors
• 5V TU Tuner Developed from 9V above
• 1.2V
Motion
• 3.3V_DVDD_PVSB Digital Video Demodulator/Decoder IC3502 Tru-Motion IC.
Estimation
Progressive Vestal Side Band
• 1.2V_DVDD_PVSB
• 1.26V_MEMC, 1.8V_MEMC,
Motion
(Dif + / Dif -)
• 3.3V_DVDD_PVSB
Compensation
IF_P / IF_N
1.8V_DDR, and 3.3V
Double Data Rate-Synchronous RAM Memory

61

February 2010

LCD DV

42SL80

Additional Main Board Information

Input Signal Processing
IC600 is the main Microprocessor and the main Signal Processor.
The Main board is responsible for :
•
•
•
•
•
•
•
•
•

ATSC, NTSC, and QAM reception and processing
RS 232 service only Port (software upgrades and home theater environment).
Wired Remote Port
(2) Component Input Y, Pr, Pb and Audio L R
(3) HDMI Inputs (back) (1) HDMI (Side Input)
RGB PC and (PC Audio)
USB (software upgrades using flash drive). USB located on the Side.
AV Composite (1 Rear and 1 Side Input)
SIF and SAP

•
•
•
•
•
•

Dual 12 Bit (24 pin) LVDS to the T-CON Board via P800 and P801.
Including 12V T-CON.
Audio output signals to the Speakers P300.
Digital Audio Output Coaxial and Optical Always active, (Note: HDMI converts to Stereo)
ON OFF Controls to the SMPS turning on low voltage generation and Backlights.
Backlight intensity control signal (Digital Dimming) P-DIM sent to the T-CON board.

Output Signals

62

February 2010

LCD DV

42SL80

Main Board Layout
VIDEO PROCESSOR
IC600 RUNS HOT,
THIS IS NORMAL.
P700 To
SMPS

T-CON Board

P800

P801

T-CON Board

IC600
Microprocessor
and
Video Processor
IC801
Tru-Motion

To Front IR
Board
Assembly

P1000

To Speakers

P300

IC1200
Audio Amp

Look carefully on top
and behind the Video
Processor IC for
Chocolate
(Heat Transfer)
material.
Be sure to transfer to
new Board if replaced.

63

February 2010

LCD DV

42SL80

42SL80
Main Board
(Front Side)
Component
Layout

P801

P800

E B

IC406

C

Q406

12V LVDS
Pins 1~4

Q408 L412
IC605

P400

IC901
DDR

2 1

X800
25Mhz

3

IC400
L406

IC300

P1000

DDR

DDR

42LS80
MAIN BOARD

IC1

P803
N/A

L422

C

C A1 A2

IC604

IC600
Mstar

IC404

L424

NAND
FLASH

D1003

Q1000

P300

USB

IC600
Micro/Video
Processor
Mstar

L305
RR+
LL+

IC900

IC801 Operates at
high temperature

DDR

IC602

E B

IC801
TruMotion

IC2

X600
12Mhz
L304

IC1200

IC301
SW600

HDMI
4

IC504

PC

IC500

RS232
D500
(1)

IC502

(4) Tuner 5V_TU

HDMI 3

(8) Data

PC
Audio

(9) Clock

Video

L

R

X500
25Mhz

(12) Dig DIF+
(13) Dig DIF-

HDMI 2

(16) SIF

Y

Pr

Pb

L

R
Q500
E B

HDMI 1
Y

Pr

Audio

Pb

64

C

(19) Analog Video

TU500 Tuner
TDVW-H103F

P100

42SL80 Main (Front Side) Component Voltages
IC300

IC400

IC404

+1.8V AMP
Pin
Regulator
[1] Gnd
[2] 1.8V
[3] 3.3V

IC406

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

+1.8V_DDR
Regulator
n/c
3.2V
3.2V
n/c
n/c
1.8V
0.8V
Gnd

IC500

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

+1.8V_MEMC
Regulator
0.8V
Gnd
4.92V
6.5V
4.8V
1.8V
1.8V
4.8V

IC504

IC602

+3.3V_ST
Pin
Regulator
[1] 0V
[2] 3.3V
[3] 5.0V

IC605

Pin
[1]
[2]
[3]

9V Reg
to IC501 Tuner 5V
12V
Gnd
8.9V

Q406

Pin
[1]
[2]
[3]
[4]
[5]

+3.3V_PVSB
Regulator
4.94V
4.94V
Gnd
3.4V
1.25V

Q408

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

HDCP
EEPROM

Pin
[1]
[2]
[3]

Reset Gen
for Power_Det
Gnd
3.5V
3.3V

5V Switch
Pin
Control
B 0.6V
C 0V
E Gnd

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

+5V/12VLVDS
Switch
5.1V
0.29V
11.9V
5.99V
11.98V
11.98V
5.06V
5.06V

Gnd
Gnd
5.0V
Gnd
3.3V
3.3V
5.0V
5.0V

65

Q500

Tuner Video
Pin
Buffer
B 1.7V
C 0V
E 2.3V

Q1000

Moving LED
Pin
Inverter
B 0V
C 3.3V
E Gnd

D500

Speed Up Reset
Pin
IC502
C 3.4V
A 3.38V

D1003

Moving LED
Pin
Routing
A1 0V
C 0.1V
A2 0V

IC403

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

+1.6V_MEMC
Regulator
0V
0.8V
1.2V
1.2V
1.8V
5.0V
1.2V
5.0V

42SL80
Main Board
(Back Side)
Component Layout

Q407
IC800

E
B

C

42SL80 MAIN BOARD
(Back View)

B
E

IC402

C

Q405

Q604

C
B

Q400

E
B
E

C

Q605
IC401

Q401
E B
C

Q600

IC504

B C
E

IC606
IC601

IC1000
IC503
D600
A1 A2
C

IC603

IC501

3

C

1 2 B
B
E

Q101

C B
E
C

Q602

B C
E

E

Q300

Q603

D200
A1 A2
C

C

1

Q200

A1 A2

D129

(1)

IC100

IC102

TUNER TU500
TDVW-H103F

(4) Tuner 5V_TU

IC101

(8) Data
(9) Clock
(12) Dig DIF+
(13) Dig DIF(16) SIF

C
B

E

Q501

(19) Analog Video

66

B
E

C

42SL80 Main (Back Side) Component Voltages
IC100

RS232
Rx/Tx

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]

3.3V
5.56V
0.02V
0.03V
5.5V
5.5V
5.5V
0V
3.29V
3.24V
n/c
3.31V
0V
5.5V
Gnd
3.29V

Pin
[1]
[2]
[3]
[4]
[5]

SPIF Optical
Audio
0.03V
0V
0V
0V
0V

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

RGB
EEPROM
Gnd
Gnd
Gnd
Gnd
3.3V
3.3V
3.18V
0V

IC101

IC102

IC401
Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

IC402
Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

Gnd
4.98V
7.6V
4.9V
3.3V
3.3V
0V

IC405
Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

WARNING
Measure Pin 1
with O-scope
ONLY

IC601

WARNING
Measure Pin 1
with O-scope
ONLY

+5V EXT
Regulator

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

Serial Flash
for Boot
0.04V
3.2V
2.5V
0V
0V
0V
3.2V
3.2V

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

Micro IC600
EEPROM
Gnd
Gnd
Gnd
Gnd
3.24V
3.24V
0V
3.24V

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

SPI Flash IC801
Memory
0V
0.8V
3.2V
0V
0V
0.09V
3.2V
3.2V

Pin
[1]
[2]
[3]
[4]
[5]
[6]

USB +5V
Switch
4.95V
Gnd
3.21V
4.95V
0V
4.95V

IC606

0.8V
Gnd
12V
9.6V
5V
4.97V
4.97V
1.9V

Q101

Pin
[1]
[2]
[3]
[4]
[5]

+5V_TU
for Tuner
8.92V
1.88V
5.04V
0V
Gnd

IC503
Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

+1.2V_PVSB
Regulator
0V
3.3V
3.4V
0V
0V
1.2V
0.8V
0V

IC504
Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

IC800

IC1000

+1.26V_PVSB
Regulator
0.8V
0V
11.8V
9.6V
5.0V
5.0V
5.0V
0.9V

IC603

Reset Gen
Pin
for IC600
[1] 0V
[2] 0V
[3] 3.3V

67

IR RS232
Pin
Buffer
B 0.634V
C 0V
E 0V

Q200

HDMI CEC
Pin
[1]
[2]
[3]
[4]
[5]
[6]

Q300

Q400
IC501

+1.26V_VDDC
Regulator
Gnd
5.0V
6.0V
4.9V
0V
0V
3.2V

+3.3V_MEMC
Regulator

Q401

Q405

Q407

3.2V
3.2V
0V
0V
0V
3.16V

Audio Mute
Pin
Switch
B 0.62V
C 0.01V
E Gnd
PWR On/Off
Pin
Switch
B 2.9V
C 5V
E 5V
INV_ON
Pin
Inverter
B 0.05V
C 4.35V
E Gnd
12V LVDS
Pin Switch Control
B 0.05V
C 0.65V
E Gnd
12V LVDS
Pin
Source
B 0.65V
C 0.0V
E Gnd

Q501

Tuner SIF
Pin
Buffer
B 2.4V
C 0V
E 3.0V

Q600

Write Protect
Pin
for IC601
B 0V
C 2.5V
E Gnd

Q602
Pin
B
C
E

S5/S6 Reset
Switch for Mstar
0V
3.28V
0V

Pin
B
C
E

Power_On_
Delay Switch
0V
0.04V
Gnd

Q603

Q604

Power_Det
Pin
Switch
B 0V
C 3.3V
E Gnd

Q605

Power_Det
Pin
+12V Side
B 0.65V
C 0.0V
E Gnd

D129

5V Routing
Pin
for IC1200
A1 0.03V
C 4.5V
A2 5.1V

D200

Shunt for
Pin
Q200
A1 0V
C 3.1V
A2 3.2V

D600

Audio Mute
Pin
Routing
A1 0.01V
C 2.7V
A2 3.29V

Main Board X600 and X800 Check
IC600 Microprocessor Crystal

2.8Vp/p
12Mhz

2.28Vp/p
12Mhz

X600

1.62V

1.58V

Only when set is on

Set on or off

1.6V

X800

X600
Location

X800
Location

1.58V
Crystal for TruMotion IC801

MAIN Board

68

February 2010

LCD DV

42SL80

Main Board Tuner with Shield Off (Pin ID)

1
4
8
9
12
13
18
19

69

February 2010

LCD DV

42SL80

Main Board Tuner Video and SIF Output Check
MAIN Board
Tuner Location

USING COLOR BAR SIGNAL INPUT

Pin 12 and Pin 13
“Dig IF” Signal

Note: “Dig IF” Signal only
when receiving a Digital
Channel.

Pin 1
700mVp/p

Pin 16 “SIF” Signal

Pin 19
“Video”
Signal
2.24Vp/p

450mVp/p

Note: “Video Out” Signal only when
receiving an analog Channel.

70

February 2010

LCD DV

42SL80

Main Board Tuner Clock and Data Lines
Note:
SCL and SDA only active
during an actual
Channel Change.

Pin 8 SDA

1V per/div

100uS

5V p/p

Pin 9 SCL

1V per/div

71

100uS

February 2010

5V p/p

LCD DV

42SL80

Main Board LVDS P800 Video Output Check
To confirm that the Main Board is outputting Picture Content signals, check P800 (LVDS) cable for
output. Check pins 11-14,16-17, 19-24, 27-30, 32-33 and 35-40. Pins 35-36 carry the clock for TA
and 19-20 carry the clock for TB. These signals vary from each other, but looking for signals like
the ones shown below on any of these pins will confirm the output of video content. This signal is
using standard SMTE Color Bar output from a generator as the input source.
Pin 51

P800

2uS

Pin 1

Pin 11

Pin 1, 2, 3, 4 (LVDS 12V)

500nS

P800
Location
MAIN Board

2uS

Pin 39
500nS

This is just a sample of two pins on the LVDS.
There are 20 pins on P801 carrying video.

72

February 2010

LCD DV

42SL80

Main Board Connector P400 to Power Supply Voltage and Diode Check
P400 “Main” to P201 “SMPS”

Stand By
5V

Pin

Label

STBY

Run

Diode
Check

1

nc

nc

nc

nc

2

PWR on

0V

4.9V

2.7V

3-6

Gnd

Gnd

Gnd

Gnd

7-10

5.2V

5.14V

5.14V

1.1V

11-12

Gnd

Gnd

Gnd

Gnd

13-14

12V

0V

11.9V

2.1V

15-16

Gnd

Gnd

Gnd

Gnd

17-18

24V

0V

24.7V

Open

19

nc

nc

nc

nc

20

INV.ON

0V

4.3V

Open

21

1

A-DIM

0V

1.8V

Open

22

ERROR

0V

0V

Open

23

nc

nc

nc

nc

PDIM

0V

0V

Open

24
1

2

(A-DIM) Pin 21 Fixed and not used

2

P400

1

PDIM Pin 24 is open on the Main Board

Diode Check taken with meter in Diode Mode with all Connectors Removed

73

February 2010

LCD DV

42SL80

Main Board LVDS Connector P800 Pin Identification
P800
51

10bit TA or
10bit TB

1

Video
Video

TB
Clock

Video

Video

Video

Video

Resolution

TA
Clock

12V for
T-CON
Board

Pin 44 PDIM (Digital Dimming) Can vary according to the brightness level
of the video signal and the OSD Backlight setting. 0.6V 0% to 3.3V 100%.
Output from the Video Processing chip IC100 (Mstar).

74

February 2010

LCD DV

42SL80

Main Board Connector P800 to T-CON Voltage and Diode Check
Diode Check taken with meter in Diode Mode with all Connectors Removed

P800 "Main" CONNECTOR to CN1 "T-CON Board“
Pin

Label

Run

Diode Check

Pin

Label

Run

Diode Check

1~4

12V T-CON

12.06V

3.18V

28

URSA_A+2

1.3V

1.1V

11

URSA_B-4

1.3V

1.1V

29

URSA_A-3

1.3V

1.1V

12

URSA_B+4

1.3V

1.1V

30

URSA_A+3

1.3V

1.1V

13

URSA_B-3

1.3V

1.1V

32

URSA_ACK-

1.2V

1.1V

14

URSA_B+3

1.3V

1.1V

33

URSA_ACK+

1.1V

1.1V

16

URSA_BCK-

1.1V

1.1V

35

URSA_A-2

1.1V

1.1V

17

URSA_BCK+

1.2V

1.1V

36

URSA_A+2

1.2V

1.1V

19

URSA_B-2

1.3V

1.1V

37

URSA_A-1

1.3V

1.1V

20

URSA_B+2

1.3V

1.1V

38

URSA_A+1

1.3V

1.1V

21

URSA_B-1

1.3V

1.1V

39

URSA_A-0

1.3V

1.1V

22

URSA_B+1

1.3V

1.1V

40

URSA_A+0

1.3V

1.1V

23

URSA_B-0

1.3V

1.1V

41

N/C

N/C

N/C

24

URSA_B+0

1.3V

1.1V

42

OPC_EN

0.6V

1.75V

25

N/C

N/C

N/C

43

N/C

N/C

N/C

27

URSA_A-2

1.3V

1.1V

44

PWM-DIM

*3.2V

1.3V

45

N/C

N/C

N/C

Pins 5, 41, 43, 46, 47, 48,
49 and 50 are all no
connection.
Pins 6,7,8,9,10, 15, 18, 26,
31, 34, and 51 are all
ground.
Text in Blue are
LVDS video
signals.

*Pin 44 PWM-DIM 3.2V (Max 100%) to
0.6V (Min 0%) Customer’s Menu Backlight setting.
The T-CON then routes P-DIM to the Ballast.
(Pin 1) is on the right

75

February 2010

LCD DV

42SL80

Main Board Connector P801 to the T-CON Board Voltage and Diode Check
P801 CONNECTOR "Main" to CN2 “T-CON"
Pin
1-2

Label

Run

Diode Test

Pin

Label

Run

Diode Test

Gnd

Gnd

Gnd

19

URSA-C-4

1.18V

Open

3

URSA-D-4

1.15V

Open

20

URSA-C+4

1.13V

Open

4

URSA-D+4

1.4V

Open

21

URSA-C-3

1.2V

Open

5

URSA-D-3

1.25V

Open

22

URSA-C+3

1.3V

Open

6

URSA-D+3

1.3V

Open

23

Gnd

Gnd

Gnd

7

Gnd

Gnd

Gnd

24

URSA-CCK-

1.23V

Open

8

URSA-DCK-

1.29V

Open

25

URSA-CCK+

1.23V

Open

9

URSA-DCK+

1.23V

Open

26

Gnd

Gnd

Gnd

10

Gnd

Gnd

Gnd

27

URSA-C-2

1.2V

Open

11

URSA-D-2

1.2V

Open

28

URSA-C+2

1.3V

Open

12

URSA-D+2

1.3V

Open

29

URSA-C-1

1.2V

Open

13

URSA-D-1

1.3V

Open

30

URSA-C+1

1.3V

Open

14

URSA-D+1

1.29V

Open

31

URSA-C-O

1.2V

Open

15

URSA-D-0

1.25V

Open

32

URSA-C+0

1.28V

Open

16

URSA-D+0

1.29V

Open

33

n/c

n/c

n/c

17

Gnd

Gnd

Gnd

34-41

n/c

n/c

n/c

18

Gnd

Gnd

Gnd

Text in Blue
are LVDS
video
signals.

(Pin 1) is on the right

Diode Mode values taken with all Connectors Removed

76

February 2010

LCD DV

42SL80

Main Board Connector P1000 to (Ft. IR/LED Control) Voltage and Diode Check
P1000 CONNECTOR "MAIN Board" to P100 "Front IR / LED Board Assy"

1

P1000

Pin

Label

STBY

Run

Diode Check

1

SCL

0V

3.2V

1.6V

2

SDA

0V

3.2V

1.6V

3

Gnd

Gnd

Gnd

Gnd

4

Key1

3.26V

3.26V

1.0V

5

Key2

3.26V

3.26V

1.3V

6

5V ST

5.1V

5.1V

1.1V

7

Gnd

Gnd

Gnd

Gnd

8

Warm_ST

Gnd

Gnd

Gnd

9

IR

4.18V

4.18V

Open

10

Gnd

Gnd

Gnd

Gnd

11

3.3V_ST

3.31V

3.31V

0.67V

12

PWR_ON

0V

3.29V

Open

Diode Check taken with meter in Diode Mode with all Connectors Removed

77

February 2010

LCD DV

42SL80

Main Board Connector P300 to Speakers Voltage and Diode Check
P300 CONNECTOR "Main" to "Speakers"

Pin

LABEL

SBY

Run

Diode Check

1

SPK-R(-)

0V

12.0V

2.63V

2

SPK-R(+)

0V

12.0V

2.63V

3

SPK-L(-)

0V

12.0V

2.63V

4

SPK-L(+)

0V

12.0V

2.63V

Use speaker out to test for defective Audio Amp IC301

1

IC301

Diode Check taken with meter in Diode Mode with all Connectors Removed

78

February 2010

LCD DV

42SL80

Side A/V Board Connector P100 to Main P101 Voltage and Diode Check
P101 Connector “Side A/V IN Board" to P100 "Main"
Pin

Label

STBY

Run

Diode
Check

1

Gnd

Gnd

Gnd

Gnd

2

CVBS_IN

0V

0V

Open

3

AV_DET

0V

0V

Open

4

Gnd

Gnd

Gnd

Gnd

5

AV_L_IN

0V

0V

Open

6

Gnd

Gnd

Gnd

Gnd

7

AV_R_IN

0V

0V

Open

8

Gnd

Gnd

Gnd

Gnd

Diode Check taken with meter in Diode Mode
with all Connectors Removed

P100

Main
1
1

P100 Connector “Main" to P100 " Side A/V IN Board"
Diode
Pin
Label
STBY
Run
Check
8

Gnd

Gnd

Gnd

Gnd

7

AV_R_IN

0V

0V

Open

6

Gnd

Gnd

Gnd

Gnd

5

AV_L_IN

0V

0V

Open

4

Gnd

Gnd

Gnd

Gnd

3

AV_DET

0V

0V

Open

2

CVBS_IN

0V

0V

0.07V

1

Gnd

Gnd

Gnd

Gnd

Main
P101

79

February 2010

Side AV Board

LCD DV

42SL80

FRONT IR SECTION
The Front IR board contains the Infrared receiver and the Intelligent Sensor.
This board receives its B+ (STBY5V) from the Main Board. It also has connections to the side Key
board. The 3.3V pull up for the Soft Touch Keys is routed from the Main board through the Front IR
board to the Soft Touch Key board.
The Front Power LEDs are now on the Soft Touch Key Board section and pulsate incrementally as the
set turns on and decrease as the set turns off. This is accomplished using an LED driver IC which
communicates with the Main board via Clock and Data lines.
There are several Zener diodes on the board as well and since it receives STAND-BY 5V (STBY 5V) it
could make the Power Supply or the Main board appear to be defective if a short was introduced to the
stand by line.

IR Board

Soft Touch
Key and LED
Board

80

February 2010

LCD DV

42SL80

Front Board Assembly (IR and Power LED) Layout (Front and Back View)
To Main Board

Main Power SW Removed

P100

1

P101
To Soft Touch
Key Board

P100
To Main
Board

IC101
IR Sensor

P101
IR Sensor

1

Intelligent
Sensor

Note: STBY5V is routed to this board.
Be aware of a possibility for a short.

p/n: EBR63322103

81

February 2010

LCD DV

42SL80

Front Board Assembly Component Check
D100

0V
D100 5.14V both sides

Q100

0V

5.14V

IC101

5V

Gnd

4.18V

82

February 2010

LCD DV

42SL80

Front Connector P100 to Main Voltage and Diode Check
P100 Connector “IR Board“
to "MAIN Board" P1000

P100

Pin

Label

STBY

Run

Diode Check

12

POWER_ON

0V

3.29V

Open

11

3.3V_ST

3.31V

3.31V

Open

10

Gnd

Gnd

Gnd

Gnd

9

IR

4.18V

4.18V

2.6V

8

Gnd

Gnd

Gnd

Gnd

7

Gnd

Gnd

Gnd

Gnd

6

5V ST

5.1V

5.1V

2.6V

5

Key2

3.26V

3.26V

Open

4

Key1

3.26V

3.26V

Open

3

Gnd

Gnd

Gnd

Gnd

2

SDA

0V

3.2V

Open

1

SCL

0V

3.2V

Open

Diode Check taken with meter in Diode Mode with all
Connectors Removed

83

February 2010

LCD DV

42SL80

Front Connector P101 to Soft Key Board Voltage and Diode Check
P101 Connector “IR Board“ to
“Soft Touch Key Board" J2
Pin

Label

STBY

Run

Diode Check

1

SCL

0V

3.29V

Open

2

SDA

3.31V

3.31V

Open

3

Gnd

Gnd

Gnd

Gnd

4

5V ST

5.1V

5.1V

Open

5

Reset

0V

0V

Open

6

Key1

3.26V

3.26V

Open

7

Key2

3.26V

3.26V

Open

8

PWM BUZZ

0V

0V

0.8V

Diode Check taken with meter in Diode Mode with all
Connectors Removed

84

February 2010

P101

LCD DV

42SL80

SOFT TOUCH KEY BOARD SECTION

To Ft. IR

p/n: EBR63609903
J2
Note: The Soft Touch Key Board is Glued into place.
1

Glue
85

February 2010

LCD DV

42SL80

Soft Touch Key Assembly J2 Information
1

J2

P101 Connector “IR Board“ to
“Soft Touch Key Board" J2
Pin

Label

STBY

Run

Diode Check

1

SCL

0V

3.29V

1.5V

2

SDA

3.31V

3.31V

1.5V

3

Gnd

Gnd

Gnd

Gnd

4

5V ST

5.1V

5.1V

1.6V

5

Reset

0V

0V

Open

6

Key1

3.26V

3.26V

1.5V

7

Key2

3.26V

3.26V

1.5V

8

PWM BUZZ

0V

0V

1.3V

86

February 2010

LCD DV

42SL80

INVISIBLE SPEAKER SYSTEM SECTION
Invisible Speaker System Overview (Full Range Speakers)
The 42SL80 contains the Invisible Speaker system.
The Full Range Speakers point downward, so there are no front viewable
speaker grills or air ports.

Top View

Reading
across speaker
wires, 8.2 ohm.
Side View

p/n: EAB60866701

87

February 2010

LCD DV

42SL80

INTERCONNECT DIAGRAM (11 X 17 Foldout) SECTION

This section shows the Interconnect Diagram called the 11X17
foldout that’s available in the Paper and Adobe version of the
Training Manual.
Use the Adobe version to zoom in for easier reading.
When Printing the Interconnect diagram, print from the Adobe
version and print onto 11X17 size paper for best results.

88

February 2010

LCD DV

42SL80

42SL80 INTERCONNECT DIAGRAM

Inverter A

U1

Do Not
Adjust

Diode Check
0.42V
Gnd
Open
Open
Open
Open

STBY
0V
Gnd
0V
0V

Run
24.7V
Gnd
1.7V
4.3V

Pin
4
3
2
1

Label
Gnd
Scan 2
Scan 1
n/c

STBY
Run
Gnd
Gnd
0V
0.67V-2.4V
0V
0.67V-2.4V
n/c
n/c

3.3V

(VDD_LCM) Pin 56,57,58
(VCC) Pin 53,54

16.3V

16.3V

(VGL) Pin 2
(VGH_M) Pin 4

T-CON Side

1) 6.9V
2) 13.7V
3) 15.7V
4) 13.7V
5) 13.0V
6) 12.0V
7) 10.9V
8) Gnd
9) 16.0V
10) 10.1V
11) 8.2V
12) 7.7V
13) 3.3V
14) 3.3V

15) 3.3V
16) Gnd
17) Gnd
18) Gnd
19) 5.8V
20) 5.0V
21) 3.9V
22) 2.9V
23) 6.0V
24) Gnd
25) 2.2V
26) 0.3V
27) 2.2V
28) 6.9V

U12

C307
C308

T-CON BOARD
(TFT Driver)

VGL

3.3V

VCC

1) Gnd
2) 1.8V 1
2
3) 3.3V

U10

11

DUTY_M1

U11

3.8V P/P
9.97Mhz

UC1

GND

GND

GND

GND

0V

0.71V-2.4V

OPEN

OPEN

D10

3.3V
Gnd

14.25V
U5
U5

12V

2

3

1~4) Gnd
5) 0V
6) 3.3V
7) 3.3V
8) 3.3V

GND
DUTY_M2

27V

D9
-2.4V
20.5V

C 3.3V

L1

Q1
F1 (12V)
(CN1) Pin 48-51 125V / 3A

B
2.78V

E
3.3V

D8

"B"

8

FB_S1

0V

0.96V

2.9V

2.9V

7

ON/OFF

0V

4.3V

OPEN

OPEN

6

STB

0V

3.2V

OPEN

OPEN

5

VREF

0V

1.0V

OPEN

OPEN

4

FB_M1

0V

1.0V

2.9V

2.9V

3

SRT

0V

1.4V

OPEN

OPEN

26V

2

SS

0V

2.9V

OPEN

OPEN

VGH_M

1

CT_SYNC_IN

0V

1.5V

1.7V

1.7V

Inverter B
U201 & U301 are DC-AC
Inverter Control ICs

U201

C208

35V
680uF

35V
680uF

16V
-

+

16V

CN3

CN1

U301

C243

CN201

VDD

U5 B+ 12V

CN2

-

CN203

24V
Q202

Q102
Q2
D
D

D

+

Pin 1 T101/T1
29.2V p/p 48kHz
Pin 6 T101/T1
30V p/p 48kHz

CN3

Q4
D
F1
65V/ 12A

G S
Q106
G
D

S

G S
G Q103
S

G S
Q3

D D

Q406

G Q6

S

S

F1
STBY 170V
RUN 188.5V
D

CN1

P205

P204
D222 D221

6

1

6

Power Supply

1

T102

T101

T101

P201
IC251

IC252

MC201

IC502

IC102

IC103
Q503
Q501

T501

T1

IC501

Q605

L1
01

To
Backlights
1.2K

B

STBY 5V

6
5

4
3

+
-

L601

Front IR
B
6
5
A

4
3

2
1

P100

P101

Gnd

STBY 5V

IR Receiver
Intelligent Sensor

100Ω

24V
12V
24 22 20 18 16 14 12 10 8
23 21 19 17 15 13 11 9 7
24V
12V

SMPS TEST 2

21
22
23
24

STBY
N/C
0V
Gnd
5.14V
Gnd
0V
Gnd
Gnd
0V

Run
N/C
4.9V
Gnd
5.14V
Gnd
11.9V
Gnd
Gnd
24.7V

Diode Check
Open
1.6V
Gnd
Open
Gnd
0.27V
Gnd
Gnd
0.42V

N/C
I-C
*A-DIM

N/C
0V
0V

N/C
4.3V
1.6V

Open
Open
Open

ERR OUT
N/C
*P-DIM

0V
N/C
N/C

0V
N/C
N/C

Q400

Q605

12V LVDS
Pins 1~4

L412

IC401
IC400 L406

DDR

C

DDR

IC602
C

C

*PWM-DIM (P-DIM) is open on the Main board, n/c.
*A-DIM is fixed and does not move.

X600
12Mhz

P300
RR+ L304
LL+
IC1200

D600

12V Light Bulb

J2 Front “Soft Switch”

USB

HDMI
4
IC504

Q101
C

B
E

TU500 Tuner
TDVW-H103F

RS232

Pin 1 T201/T301
29.2V p/p 48kHz
Pin 6 T201/T301
30V p/p 48kHz

IC501

IC500

D500
(1)
IC100

IC102

IC502

Video

L

R

HDMI 2

P100

X500
25Mhz

Q501
C

Pr

Pb

L

R
Q500

P1000 “Main” to P100 “Front IR”
Pin
Label
STBY Run Diode Check
SCL
0V
3.2V
1.6V
Intelligent Sensor 1
SDA
0V
3.2V
1.6V
Intelligent Sensor 2
3
Gnd
Gnd Gnd
Gnd
4
Key1
3.26V 3.26V
1.0V
5
Key2
3.26V 3.26V
1.3V
Stand-by 5V 6
5V_ST
5.1V 5.1V
1.1V
7
Gnd
Gnd Gnd
Gnd
Keys
8 Warm_ST Gnd Gnd
Gnd

E

Y

Pr

T301

IC503

PC

Y

1

CN205

Q602

PC
Audio

6

IC1000

D129 C

IC101

D

L424

HDMI 3

Indicates Hot
Ground

S

IC404

MAIN BOARD

A2 A1

S

Q303

IC405

B
E

Micro/Video
Processor
Mstar

A2 A1
C
C
E B
IC603
IC301 Q300 C 3
Q603 E B 2 1
SW600
A2 A1
C
B
D200
E
C

Q200

D D

1

T201

P803
N/A

L422

NAND
FLASH

L305

To
Spks

DDR

IC601

D1003

Q1000 A1 A2

S

G S
G

IC604

IC600
Mstar

IC606
E B

G S G S
G Q206 Q306 G

IC900

Grayed Out Components are on the Back Side
Q600

IC1

IC300

6

IC801 Operates at
high temperature

C

Q302
D

IC901

IC801
TruMotion

IC2

Q401

S

D

Q204 Q304
D

DDR

X800
25Mhz

IC402

B E

P1000

IC800

D

G S
Q203
G

See pages 3/4 of Interconnect
Diagram for LVDS Waveforms

P801

P800

3
IC605

P400

Open

SMPS TEST 2: Jump pins 7,8,9 or 10 (5V) to pin 20
(INV-ON). The Backlights should turn on.

B
E B
E C
B
E

C

Open
Open

SMPS TEST 1: To Force Power Supply On.
Disconnect P800 on Main board.
Load the 5V line using a 12V light bulb.
Jump pins 7,8,9 or 10 (5V) to pin 2 using a 100Ω
resistor. (Test Voltage Outputs 12V, 24V to Main
and 24V to both Inverters).

E
Q407
B C
Q405 C B
E
Q604 C 2 1

HDMI 1

STBY 5V

INV-ON

100Ω

17-18
19
20

Label
N/C
PWR-ON
Gnd
5.2V
Gnd
12V
Gnd
A-Gnd
24V

Q408

C

Q101 RL101

12V Light Bulb
C

Q502

Pin
1
2
3-6
7-10
11-12
13-14
15
16

Q606

BD101

P101 SK100

Gnd

A

D603

R103

F100
6.3A/250V

2
1

L600

CX105

CX101

100Ω

24V
12V
24 22 20 18 16 14 12 10 8
23 21 19 17 15 13 11 9 7
24V
12V

CX102

PWR ON

STBY 5V

SMPS TEST 1
P201

C613

C614

C616

C615

CX104

D602

L103
CX103

P201

39uF/450V

39uF/450V

39uF/450V

39uF/450V

39uF/450V

L102

C611

F1
3.15A/250V
39uF/450V

CN5

Q110

C612

Q111

IC406 E B

P201 "SMPS" to P400 "Main"

G S
G

See second page of Interconnect
Diagram for Main board DC Voltages

LVDS

12V to T-CON
Pin 48~51.

+

F1
65V/ 12A

D

Q104

Black

To Center 13 bulbs

Diode
Check
OPEN

9
Gnd
Protect

FL2

Diode
STBY
Run
Check
0V
0.71V-2.4V OPEN

10
-5V
Gnd

D7

Diode Check Diode Check
Gnd
Gnd
0.98V
Open
0.98V
Open
0.98V
Open

Label

U13

L2

FL3
Gnd Protect

Pin

CN4
C303
C304

"A"

CN3 "Inverter A" To CN203 "Inverter B"

TO TFT MODULE

3.3V

CN5
U12

CN2

35V
680
uF

(VDD_LCM) Pin 3,4,5
(VCC) Pin 7,8

TO TFT MODULE

Diode Check
0.42V
Gnd
Open
Open

CN2 "Inverter A" to CN3 "T-CON"

C8

+

Label
24V
Gnd
A-DIM
*I-C

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

C43
35V
680
uF

Run
24.7V
Gnd
1.7V
4.3V
N/C
0V

P205 "SMPS" to CN501 "Inverter B"

U101 & U1 are DC-AC Inverter
Control ICs

U101

STBY
0V
Gnd
0V
0V
0V
0V

PANEL BACKLIGHT CONNECTIONS

-5V
26V

R704
R705
R706

*I-C is Inverter On
*P-DIM is not used on this pin.

Label
24V
Gnd
A-DIM
*I-C
*PWM-DIM
ERROR

C302
C301

Black To Center 13 bulbs

Pin
1,2,3,4,5
6,7,8,9,10
11
12
13
14

SC1

To Top 6 and Bottom 6 bulbs
16V
3.3V

C744
R721

PANEL BACKLIGHT CONNECTIONS

-

(VGL) Pin 59
(VGH_M) Pin 57

P204 "SMPS" to CN1 "Inverter A"

To Top 6 and Bottom 6 bulbs

16V
3.3V

C306
C305

MC1

-5V
26V

Pb

P1000 “Main” to P100 “Front IR”
Pin
Label
STBY Run Diode Check
Remote 9
IR
4.18V 4.18V
Open
10
Gnd
Gnd
Gnd
Gnd
11
3.3V_ST
3.31V 3.31V
0.67V
12
PWR_ON
0V
Open
3.29V

Audio

(19)

E B

B

(4) Tuner 5V_TU
(8) Data
(9) Clock
(12) Dig DIF+
(13) Dig DIF(16) SIF
(19) Analog Video

P101

Side A/V

C

P100 “Main” to P101 “Side A/V”
Pin
Label
STBY Run Diode Check
8
Gnd
Gnd Gnd
Gnd
7 AV_R_IN
Open
0V
0V
Gnd Gnd
Gnd
Gnd
6
0V
0V
5 AV_L_IN
Open
4
Gnd Gnd
Gnd
Gnd
0V
0V
Open
AV_DET
3
0V
0V
2 CVBS_IN
0.07V
Gnd
Gnd Gnd
1
Gnd

P101 “Side A/V” to P100 “Main”
Pin
Label
STBY Run Diode Check
1
Gnd
Gnd Gnd
Gnd
AV_R_IN
2
Open
0V
0V
Gnd Gnd
Gnd
3
Gnd
0V
0V
4
AV_L_IN
Open
5
Gnd Gnd
Gnd
Gnd
0V
0V
Open
AV_DET
6
7 CVBS_IN
0V
Open
0V
Gnd
8
Gnd Gnd
Gnd

To
Backlights
1.2K

42SL80 MAIN (FRONT SIDE) SIMICONDUCTORS
IC300

+1.8V AMP
Pin
Regulator
[1] Gnd
[2] 1.8V
[3] 3.3V

IC400
Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

+1.8V_DDR
Regulator
n/c
3.2V
3.2V
n/c
n/c
1.8V
0.8V
Gnd

IC404
Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
IC406

IC500

+1.8V_MEMC
Regulator
0.8V
Gnd
4.92V
6.5V
4.8V
1.8V
1.8V
4.8V

IC504

IC605

Pin
[1]
[2]
[3]
[4]
[5]

+3.3V_PVSB
Regulator
4.94V
4.94V
Gnd
3.4V
1.25V

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

HDCP
EEPROM
Gnd
Gnd
5.0V
Gnd
3.3V
3.3V
5.0V
5.0V

+5V EXT
Regulator
0.8V
Gnd
12V
9.6V
5V
4.97V
4.97V
1.9V

IC503

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

+1.26V_VDDC
Regulator
8.0V Oscilloscope ONLY
Gnd
WARNING
5.0V
IC501
+5V_TU
Measure Pin
6.0V
Pin
for
Tuner
1 with O4.9V
[1]
8.92V
scope ONLY
0V
[2] 1.88V
0V
[3] 5.04V
3.2V
[4] 0V
[5] Gnd
+3.3V_MEMC
Regulator
8.0V Oscilloscope ONLY
Gnd
4.98V WARNING
Measure Pin
7.6V
1 with O4.9V
scope
ONLY
3.3V
3.3V
0V

IC504

IC602

+3.3V_ST
Pin
Regulator
[1] 0V
[2] 3.3V
[3] 5.0V
9V Reg
Pin to IC501 Tuner 5V
[1] 12V
[2] Gnd
[3] 8.9V

Pin
[1]
[2]
[3]
Q406

Reset Gen
for Power_Det
Gnd
3.5V
3.3V

5V Switch
Pin
Control
B 0.6V
C 0V
E Gnd

Q408

Q500

Tuner Video
Pin
Buffer
B 1.7V
C 0V
E 2.3V

Q1000

Moving LED
Pin
Inverter
B 0V
C 3.3V
E Gnd

+5V/12VLVDS
Switch
5.1V
0.29V
11.9V
5.99V
11.98V
11.98V
5.06V
5.06V

D500

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

Speed Up Reset
Pin
IC502
C 3.4V
A 3.38V

D1003

Moving LED
Pin
Routing
A1 0V
C 0.1V
A2 0V

+1.2V_PVSB
Regulator
0V
3.3V
3.4V
0V
0V
1.2V
0.8V
0V

IC606

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

+1.26V_PVSB
Regulator
0.8V
0V
11.8V
9.6V
5.0V
5.0V
5.0V
0.9V

IC800

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

IC1000

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

Serial Flash
for Boot
0.04V
3.2V
2.5V
0V
0V
0V
3.2V
3.2V

IC403
Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

+1.6V_MEMC
Regulator
0V
0.8V
1.2V
1.2V
1.8V
5.0V
1.2V
5.0V

42SL80 MAIN (BACK SIDE) SIMICONDUCTORS
IC100

RS232
Rx/Tx

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]

3.3V
5.56V
0.02V
0.03V
5.5V
5.5V
5.5V
0V
3.29V
3.24V
n/c
3.31V
0V
5.5V
Gnd
3.29V

Pin
[1]
[2]
[3]
[4]
[5]

SPIF Optical
Audio
0.03V
0V
0V
0V
0V

IC101

IC102
Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
IC401
Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
IC402
Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

RGB
EEPROM
Gnd
Gnd
Gnd
Gnd
3.3V
3.3V
3.18V
0V

IC405

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

Micro IC600
EEPROM
Gnd
Gnd
Gnd
Gnd
3.24V
3.24V
0V
3.24V

Pin
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]

SPI Flash IC801
Memory
0V
0.8V
3.2V
0V
0V
0.09V
3.2V
3.2V

Pin
[1]
[2]
[3]
[4]
[5]
[6]

USB +5V
Switch
4.95V
Gnd
3.21V
4.95V
0V
4.95V

IC603

Reset Gen
Pin
for IC600
[1] 0V
[2] 0V
[3] 3.3V

Q401

INV_ON
Pin
Inverter
B 0.05V
C 4.35V
E Gnd

Q603

Power_On_
Pin Delay Switch
B 0V
C 0.04V
E Gnd

Q101

IR RS232
Pin
Buffer
B 0.634V
C 0V
E 0V

Q405

12V LVDS
Pin Switch Control
B 0.05V
C 0.65V
E Gnd

Q604

Power_Det
Pin
Switch
B 0V
C 3.3V
E Gnd

Q407

12V LVDS
Pin
Source
B 0.65V
C 0.0V
E Gnd

Q605

Power_Det
Pin
+12V Side
B 0.65V
C 0.0V
E Gnd

Q501

Tuner SIF
Pin
Buffer
B 2.4V
C 0V
E 3.0V

D129

5V Routing
Pin
for IC1200
A1 0.03V
C 4.5V
A2 5.1V

Q600

Write Protect
Pin
for IC601
B 0V
C 2.5V
E Gnd

D200

Shunt for
Pin
Q200
A1 0V
C 3.1V
A2 3.2V

D600

Audio Mute
Pin
Routing
A1 0.01V
C 2.7V
A2 3.29V

Q200

Q300
IC601

HDMI CEC
Pin
[1]
[2]
[3]
[4]
[5]
[6]

Q400

3.2V
3.2V
0V
0V
0V
3.16V

Audio Mute
Pin
Switch
B 0.62V
C 0.01V
E Gnd
PWR On/Off
Pin
Switch
B 2.9V
C 5V
E 5V

Q602
Pin
B
C
E

S5/S6 Reset
Switch for Mstar
0V
3.28V
0V

42SL80 LVDS P800 WAVEFORMS

Pin 11

Pin 12

Pin 13

Pin 14

Pin 16

Pin 17

Pin 19

Pin 20

Pin 21

Pin 22

Pin 23

Pin 24

Pin 27

Pin 28

Pin 29

Pin 33

Pin 35

Pin 30

Pin 37

Pin 32

Pin 38

Pin 39

Pin 40

Pin 36

42SL80 P800 LVDS CABLE WAVEFORMS:
Waveforms taken using SMTP Color Bar input.
All readings give the Scale 10mV and Time Base
related to scope settings.
Top waveform in each image gives a slower rate,
2us per division. Outlined area is shown in the
bottom waveform at 500ns per division time
base.

42SL80 LVDS P801 WAVEFORMS

Pin 3

Pin 4

Pin 5

Pin 6

Pin 8

Pin 9

Pin 11

Pin 12

Pin 13

Pin 14

Pin 15

Pin 16

Pin 19

Pin 20

Pin 21

Pin 22

Pin 24

Pin 25

Pin 27

Pin 28

Pin 29

Pin 30

Pin 31

Pin 32

42SL80 P801 LVDS CABLE WAVEFORMS:
Waveforms taken using SMTP Color Bar input.
All readings give the Scale 10mV and Time Base
related to scope settings.
Top waveform in each image gives a slower rate,
2us per division. Outlined area is shown in the
bottom waveform at 500ns per division time
base.

42SL80
Direct View LCD
This concludes the 42SL80
training session.

www.s-manuals.com

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