TV 8888 25rd 42

User Manual: TV-8888-42

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Page Count: 45

HAIER

COLOUR TELEVISION

SERVICE MANUAL

PART # TV-8888-42

HAIER AMERICA TRADING, LLC

www.haieramerica.com

TABLE OF CONTENTS

Product Code Explanation and Series

Introduction

Features 4 – 5

Safety Precautions 6

Warning and Cautions 7 –8

General Servicing Precautions 9 – 13

Net Dimension 14

Parts and Functions 15

Remote Controller Functions 16

Program Diagram 17 – 22

Maintenance Service and Troubleshooting 23 – 27

Circuit Diagram 28 – 29

PCB Diagram 30

Circuit Explanation 31 –33

Service Mode and Adjusting Items and

Data

34 – 36

Circuit Signals Processing 37 - 40

Adjustment 41 - 42

Information of Resistors and Capacitors 43

Abbreviation of Part Name and

Description

Terminal View of Transistors 45

PRODUCT CODE EXPLANATION AND SERIES INTRODUCTION

BH 2004 D

Color television appearance

CRT cater corner 20inch

Appearance serial

BRAND

FEATURES

No FUNCTION

1 Main IC 76814

2 CRT Flat picture

3 Color system NTSC3.58

4 Audio system M

5 No. Of channels 181

6 OSD language ENGLISH、 FRENCH、 SPANISH

PIC

Multi-picture modes

8 AV stereo

9 Super woofer

10 Surrounding sound

11 Treble/bass boost

12 Left/right balancer

13 NICAM

14 Multi-audio modes

15 Tone adjuster

16 MTS/SAP

AUDIO

Auto-volume leveling

18 AV input Y

19 AV output

20 DVD terminal

21 S-video jack

22 Headphone socket Y

JIC

SCART socket

24 Digital curtain

25 Slow fading on & off

26 Semitransparent menu

27 Non-flashing channel changing

28 ZOOM

29 16:9 mode

30 Games

31 Calendar

32 Child-lock

33 Multi-functional lock Y

34 No-picture listening

35 Background light

36 Auto-timer on

37 CCD Y

SOFTWARE

V-CHIP Y

Continued:

FUNCTION

39 NO. Of built-in speakers 1

40 Audio output power (W) 3W

41 Total power input W 70W

42 Voltage range V 120V

43 Power frequency Hz 60HZ

44 Time of sleep timer (mins) 120MIN

45 Net weight (lbs) 46.2

46 Gross weight (lbs) 50.7

47 Net dimension (MM)

48 Packaged dimension (MM)

49 Quantity for 20' container

50 Quantity for 40' container

PARAMETER

Quantity for 40' high container

52 Acquired certificate

APPROVAL

Suitable market

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE

These parts identified by many electrical and mechanical parts in this chassis have

special safety-related characteristics.

It is essential that these special safety parts be replaced with the same components

as recommended in this manual to prevent X-RADIATION, Shock, Fire, or other

Hazards.

Do not modify the original design without permission of the manufacturer.

General Guidance

An Isolation Transformer should always be used during the servicing of a receiver

whose chassis is not isolated from the AC power line. Use a transformer of adequate

power rating as this protects the technician from accidents that might result in

personal injury caused by electrical shocks.

It will also protect the receiver and it’s components from being damaged by

accidental shorts of the circuitry that might be inadvertently introduced during the

service operation.

If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with a

specified one.

When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep

the resistor 0.39inch away from PCB.

Keep wires away from high voltage or high temperature parts.

Due to the high vacuum and large surface area of the picture tube, extreme care

should be taken in handling the Picture Tube. Do not lift the Picture Tube by its Neck.

X-RAY Radiation

Warning:

The sources of X-RAY RADIATION in this TV receiver are the High Voltage Section

and the Picture Tube.

For continued X-RAY RADIATION protection, the replacement tube must be of the

same type as specified in the Replacement Parts List.

Before returning the receiver to the customer, always perform an AC leakage current

check on the exposed metallic parts of the cabinet, such as antennas, terminals, etc.,

to make sure that the set is safe to operate without any danger of electrical shock.

WARNING AND CAUTIONS

1. When you clean the TV set, please pull

out the power plug from AC outlet. Don't

clean the cabinet and the screen with

benzene, petrol and other chemicals.

4. To prevent the TV set from firing and

electric shock, don't

make the TV set rain

or moisture.

In order to prolong the using life of the

TV set, please place it on a ventilated

place.

5. Don't open the back cover, otherwise it is

possible to damage the components in the

TV set and harm you.

Don't place the

TV set in the

sunshine or near

heat source.

6. When the TV set isn't going to be used

for long time or it is in thunder and

lightening, please pull out the plug from AC

outlet and the antenna plug from the cover

of the TV set.

Explanation on the display tube

Generally, it is not required to clean the tube surface. However, if necessary, its

surface can be cleaned with a dry cotton cloth after putting off the power. Don’t use

any cleanser. Avoid using a hard cloth; the tube surface will be damaged.

CAUTION: Before servicing receivers covered by this service manual and its

supplements and addenda, read and follow the SAFETY PRECAUTIONS.

NOTE: If unforeseen circumstances create conflict between the following servicing

precautions and any of the safety precautions, always follow the safety precautions.

NB: Remember; Safety First.

GENERAL SERVICING PRECAUTIONS

1. Always unplug the receiver AC power cord from the AC power source before:

a. Removing or reinstalling any component, circuit board module or any other

assembly of the receiver.

b. Disconnecting or reconnecting any receiver electrical plug or other electrical

connection.

c. Connecting a test substitute in parallel with an electrolytic capacitor in the

receiver.

CAUTION: A wrong substitution part or incorrect installation polarity of electrolytic

capacitors may result in an explosion hazard.

d. Discharging the picture tube anode.

2. Test high voltage only by measuring it with an appropriate high voltage meter or

other voltage-measuring device (DVM, FETVOM, etc.) equipped with a suitable

high voltage probe. Do not test high voltage by “drawing an arc”.

3. Discharge the picture tube anode only by (a) first connecting one end of an

insulated clip lead to the degaussing or kine aquadag grounding system shield at

the point where the picture tube socket ground lead is connected, and then (b)

touch the other end of the insulated clip lead to the picture tube anode button,

using an insulating handle to avoid personal contact with high voltage.

4. Do not spray chemicals on or near this receiver or any of its assemblies.

5. Unless specified otherwise in this service manual, clean electrical contacts only by

applying the following mixture to the contacts with a pipe cleaner, cotton-tipped

stick or comparable nonabrasive applicator; 10% (by volume) Acetone and 90%

(by volume) isopropyl alcohol (90%-99% strength)

CAUTION: This is a flammable mixture.

Unless specified otherwise in this service manual, lubrication of contacts is not

required.

6. Do not defeat any plug / socket B+ voltage interlocks with which receivers

covered by this service manual might be equipped.

7. Do not apply AC power to this instrument and/or any of its electrical assemblies

unless all solid-state device heat sinks are correctly installed.

8. Always connect the test receiver ground lead to the receiver chassis ground

before connecting the test receiver positive lead.

Always remove the test receiver ground lead last.

9. Use with this receiver only the test fixtures specified in this service manual.

CAUTION: Do not connect the test fixture ground strap to any heat sink in this

receiver.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity.

Such components are usually called Electrostatically Sensitive (ES) Devices.

Examples of typical ES devices are integrated circuits and some field effect

transistors and semiconductor “chip” components. The following techniques should

be used to help reduce the incidence of component damage caused by static

electricity.

1. Immediately before handling any semiconductor component or semiconductor-

equipped assembly, drain off any electrostatic charge on your body by touching a

known earth ground. Alternatively, obtain and wear a commercially available

discharging wrist strap device, which should be removed to prevent potential

shock prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ES devices, place the

assembly on a conductive surface such as aluminum foil, to prevent electrostatic

charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static type folder removal device. Some solder removal devices

not classified as “anti-static” can generate electrical charges sufficient to damage

ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges

sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until

immediately before you are ready to install it. (Most replacement ES devices are

packaged with leads electrically shorted together by conductive foam, aluminum

foil or comparable conductive material).

7. Immediately before removing the protective material from the leads of a

replacement ES device, touch the protective material to the chassis or circuit

assembly into which the device will be installed.

CAUTION: Be sure no power is applied to the chassis or circuit, and observe all

other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices.

(Otherwise even some normally harmless motions such as mutual brushing of

your clothes’ fabric or lifting of your foot from a carpeted floor might generate

static electricity sufficient to damage an ES device.)

General Soldering Guidelines

1. Use a grounded-tip, low-wattage soldering iron and appropriate tip size and

shape that will maintain tip temperature within the range of 500 oF to 600 oF.

2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40

parts lead.

3. Keep the soldering iron tip clean and well tinned.

4. Thoroughly clean the surfaces to be soldered. Use a small wire bristle (0.5 inch)

brush with a metal handle. Do not use freon-propelled spay-on cleaners.

5. Use the following unsoldering technique

a. Allow the soldering iron tip to reach normal temperature. (500 oF to 600oF)

b. Heating the component lead until the solder melts.

c. Quickly draw the melted solder with an anti-static, suction-type solder

removal device with solder braid.

CAUTION: Work quickly to avoid overheating the circuit board printed foil.

6. Use the following unsoldering technique

a. Allow the soldering iron tip to reach normal temperature. (500 o F to 600o F)

b. First, hold the soldering iron tip and solder the strand against the

component lead until the solder melts.

c. Quickly move the soldering iron tip to the junction of the component lead

and the printed circuit foil, and hold it there only until the solder flows onto

and around both the component lead and the foil.

CAUTION: Work quickly to avoid overheating the circuit board printed foil.

d. Closely inspect the solder area and remove any excess or splashed solder

with a small wire-bristle brush.

Removal /Replacement

Some chassis circuit boards have slotted holes (oblong) through which the IC leads

are inserted and then bent flat against the circuit foil. When holes are of slotted type,

the following technique should be used to remove and replace the IC. When working

with boards using the familiar round hole, use the standard technique as outlined.

Removal

De-solder and straighten each IC lead in one operation by gently prying up on the

lead with the soldering iron tip as the solder melts.

Draw away the melted solder with an anti-static suction-type solder removal device

(or with solder braid) before removing the IC.

Replacement

Carefully insert the replacement IC in the circuit board.

Carefully bend each IC lead against the circuit foil pad and solder it.

Clean the soldered areas with a small wire-bristle brush. (It is not necessary to

reapply acrylic coating to the areas).

“Small-Signal” Discrete Transistor

Removal/Replacement

Remove the defective transistor by clipping its leads as close as possible to the

component body.

Bend into a “U” shape the end of each of three leads remaining on the circuit board.

Bend into a “U” shape the replacement transistor leads.

Connect the replacement transistor leads to the corresponding leads extending from

the circuit board and crimp the “U” with long nose pliers to insure metal to metal

contact then solder each connection.

Power Output, Transistor Device

Removal/Replacement

Heat and remove all solder from around the transistor leads.

Remove the heat sink mounting screw (if so equipped).

Carefully remove the transistor from the heat sink of the circuit board.

Insert new transistor in the circuit board.

Solder each transistor lead, and clip off excess lead.

Replace heat sink.

Diode Removal/Replacement

Remove defective diode by clipping its leads as close as possible to diode body.

Bend the two remaining leads perpendicularly to the circuit board.

Observing diode polarity, wrap each lead of the new diode round the corresponding

lead on the circuit board.

Securely crimp each connection and solder it.

Inspect (on the circuit board copper side) the solder joints of the two “original” leads.

If they are not shiny, reheat them and if necessary, apply additional solder.

Fuse and Conventional Resistor

Removal/Replacement

1. Clip each fuse or resistor lead at top of the circuit board hollow stake.

2. Securely crimp the leads of replacement component around notch at stake top.

3. Solder the connections

CAUTION: Maintain original spacing between the replaced component and

adjacent components and the circuit board to prevent excessive component

temperatures.

Circuit Board Foil Repair

Excessive heat applied to the copper foil of any printed circuit board will weaken the

adhesive that bonds foil to the circuit board causing the foil to separate from or “lift-

off” the board. The following guidelines and procedures should be followed whenever

this condition is encountered.

At IC Connections

To repair a defective copper pattern at IC connections use the following procedure to

install a jumper wire on the copper pattern side of the circuit board. (Use this

technique only on IC connections).

1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only as

much copper as absolutely necessary).

2. Carefully scratch away the solder resist and acrylic coating (if used) from the end

of the remaining copper pattern.

3. Bend a small “U” in one end of a small gauge jumper wire and carefully crimp it

around the IC pin. Solder the IC connection.

4. Route the jumper wire along the path of the out-away copper pattern and let it

overlap the previously scraped end of the good copper pattern. Solder the

overlapped area and clip off any excess jumper wire.

At other connections

Use the following technique to repair the defective copper pattern at connections

other than IC Pins. This technique involves the installation of a jumper wire on the

component side of the circuit board.

1. Remove the defective copper pattern with a sharp knife.

Remove at least 1/4 inch of copper, to insure that a hazardous condition will not

exist if the jumper wire opens.

2. Trace along the copper pattern from both sides of the pattern break and locate

the nearest component that is directly connected to the affected copper pattern.

3. Connect insulated 20-gauge jumper wire from the lead of the nearest component

on one side of the pattern break to the lead of the nearest component on the

other side.

Carefully crimp and solder the connections.

CAUTION: Be sure the insulated jumper wire is dressed so that it does not touch

components or sharp edges.

NET DIMENSION

PARTS AND FUNCTIONS

Front and side panel of TV Set

TV/AV MENU VOLUME CHANNEL

EARPHONE VIDEO AUDIO

POWER

• When using the S-terminal, please pull out the Video 1 input

terminal.

REMOTE CONTROLLER FUNCTIONS

789

RECALL

TV/ AV

RATI NG MUTE

P.ST D SLEEP

DISPLAY

M EN U CH +

VO L - VO L +

CH-

11 12

PROGRAM DIAGRAM

• Features

The HTN19R12 color TV set(s) (designed for the US market) incorporate the

monolithic integrated circuit LA76814K developed by SANYO in 1999 and the CPU

LC863432B-535A designed for LA76814K control.

LA76814K intergrates the sound accompany filter and trap filter in the chip,

resulting in minimized application of peripheric components, maximized integtration

and reliable performance.

The chip functions for picture intermediate frequency amplification, picture

detection, sound intermediate frequency amplification, sound frequency

discrimination, video amplification, choma decoding, line and field synchronized

scanning wave formation and output.

The circuits of picture detection, sound frequency discrimination and chroma

decoding incorporate PLL demodulation which is noted for significant stability and

reliability. In addition, this chip integrates the brightness and chroma retarding lines

and additional functions of black level extension, bus geometric figure adjustment,

I2C bu control on the basis of the 7687, resulting in test point free assembly,

reduced components of test point and peripheric components and improved picture

quality.

The CPU LC863424 uses SANYO LC863432B-535A series for reprogramming. In the

design, functions of CCD and V-CHIP as well as various function extensions are

added for the North American market. This chip also uses low frequency 32.7KHZ

crystal oscillator to reduce interferences to pictures and medium frequency signals.

• Technical properties and requirements

1. Main performance index

1. Screen diagonal: 20 inch

2. Receiving system: NTSC-M

3. Receiving channel: VHF-channel 2~13

UHF-channel 14~49

CATV-channel

1~125

4. Antenna input: 75ΩF plug

5. Picture limit noise sensibility: VHF≤51dBμV

UHF≤54dBμV

6. Color sensitivity: ≤40dB（μV

7. Two signal selectivity: -1.5MHZ≥45dB

+6MHZ≥50dB

8. Sound noise limit sensitivity: VHF≤39dBμV

UHF≤42dBμV

9. Sound output power: ≥2W

10. X-ray radiation value: <0.1mR/Hr

11. Voltage: AC 100 -130V

12. Energy consumption: ≤70W

13. Net dimensions: 22.8 X 21.2 X 20.8 inch

14. Net weight: 48.5 lbs

• User’s instructions

Note: This TV set has been installed together with a caption decoder and control to

US Federal Communications Commission.

Customized Power On setup

This TV set is designed for customized initiation. (For detailed information, see the

User’s Manual.) The TV set has been preset before delivery and can be reset by the

user.

Power on

1. When the TV set is connected with the power supply, the power indicator

illuminates. When the Power On/Off button on the TV set or the remote controller

is pressed, the TV set is started.

2. When the MENU button on the remote controller is pressed, the menu will appear

on the screen. The CH and VOL buttons are used for setup.

3. Press of CH+ or CH- button will result in moving the icon up or down for function

options. The designated item will turn green.

4. Pressing the VOL+ or VOL- button can change the designated item.

VIDEO setup

1. Press MENU button for VIDEO option.

2. Press CH+ or CH- button to designate desired item. (Move the icon to designated

item and the submenu will appear.)

3. The menu item under the icon will turn bright green. Press VOL+ or VOL- button

for options.

Options VOL+ VOL-

CONTRAST Contrast increase Contrast decrease

BRIGHT Brightness increase Brightness decrease

COLOR Color increase Color decrease

SHARP Sharpness increase Sharpness decrease

TINT Tint increase Tint decrease

4. Press MENU button again to quit the main MENU.

SETUP

1. Press SETUP button, the main menu will appear on the screen.

2. Press CH+ or CH- for LANGUAGE options. The designated LANGUAGE will turn

bright green.

3. Press VOL+ or VOL- for LANGUAGE options (such as English, Spanish and

French)

4. Receiving: Press VOL- button to move the icon to RECEPTION. The TV set is

preset AIR state before delivery (indicating that unlimited receiving of 0~63

channel signals). If the TV set is connected with the cable TV system, press

VOL+ button for CABLE option.

5. Automatic search: Press CH+ or CH- button for AUTO PROGRAM. When VOL or

+VOL- is pressed, the function of automatic channel search will be activated (if

signals are available, the channel will be fixed. If VOL+ button is pressed again,

the search can be resumed.)

6. Add/delete: Press CH+ or CH- button for option of ADD/DELETE. Press VOL+ or

VOL- button to add or delete some channel.

7. Input: Press CH+ or CH- button for option of INPUT. Press VOL+ or VOL- button,

or press AV/TV button on the remote controller for option of AV/TV.

8. Press MENU button again to quit the main menu.

TIME setup

1. Press MENU button and the main menu appear on the screen.

2. Press CH+ or CH- button to move the icon for TIME setup. The designated

CLOCK under the icon will turn bright green.

3. Press VOL+ or VOL- button for options of hour, minute and am/pm on the

CLOCK.

4. Press CH+ or CH- to adjust the figure until designed time value is reached. Set

ON TIME/OFF TIME with the same way.

5. Press CH+ or CH- for option of SLEEP. Press VOL+ or VOL- for option of set

clock. The clock display will turn bright green while SLEEP icon turns blue. Press

CH+ or CH- for sleep period adjustment.

0：15 / 0：30 / 0：45 / 1：00 / 1：15 / 1：30 / 1：45 / 2：00

6. When CHANNEL in TIME setup is designated, this option will be the preset

channel when the TV set is turned on or off.

7. Press MENU button again to quit the main menu.

SPECIAL

1. Press MENU button and the main menu appear on the screen.

2. Press CH+ or CH- button to move the icon to SPECIAL, and designate

C.CAPTION. Then icon of C.CAPTION turns to bright green. When OFF is

displayed, C.CAPTION is inactivated while when ON is displayed, C.CAPTION is

activated.

3. Press CH- to move the icon to CC ON MUTE and the icon will turn bright green.

Press VOL+ or VOL- button for adjustment of this function. When OFF is

displayed, the item cannot display its function regardless of the indication of

C.CAPTION. When this item displays C1 while C.CAPTION displays OFF, the

system will activate C.CAPTION function automatically.

4. Press CH- button to move the icon to POWER RESTORE. Press VOL+ or VOL- to

adjust power on and off.

5. When icon designates MENU OFFSET, the digital value of the designated item can

be adjusted by pressing VOL+ or VOL-. Function of this item is to change the

location of the menu.

6. Press MENU button again to quit the main menu.

V—CHIP setup

This function is designed for television program limitation. The TV set user is allowed

to control the usage of the TV set in accordance with the regulations of US Federal

Communications Commission. This function is also destined to prevent children from

watching the TV programs which are improper for juvenile.

1. Press MENU button, the menu will appear on the screen. Press RATING button,

V-CHIP displays the menu.

2. Press CH+ or CH- button to move the icon to another option, then the designated

item will turn bright red.

3. When an item is selected, press MENU button and the submenu of the designated

item will appear on the screen.

4. Press MENU button and return to V-CHIP.

5. Press RATING button to the main menu.

6. Press RATING button again to quit the main menu.

OPTION MENU

1. Press RATING button, and the RATING main menu will appear on the screen.

2. Designate OPTION MENU and then press MENU button, OPTION MENU will appear

on the screen.

3. Press CH+ or CH- button for item option, and the color of designated item will

change from yellow to bright green.

4. When HELP is selected, press MENU button and HELP menu will appear on the

screen. Press CH+ or CH- to search up and down for relative items. If MENU

button is pressed again, OPTION MENU will appear.

5. When NO-INFO RATING is selected, press MENU button for option of UNBLOCK or

BLOCK state.

6. When NO RATED is selected, press MENU button for option of UNBLOCK or

BLOCK state.

7. When ENTER PASSWARD is selected, press MENU button, then a dialog box will

appear at bottom left corner of the screen and then a 4 digit password can be

input. Press RATING button again to return to the main menu. The password

must be input when entering the V-CHIP submenu.

TV RATING

1. Press RATING button.

2. When TV RATING is selected, press MENU button and the submenu will appear

on the screen as follows:

TV RATING

TV-Y

TV-Y7 

TV-G

TV-PG    

TV-14    

TV-MA   

RATING FV V S L D

In the table, the blocks marked “” indicates the restrictive items. If all

restrictive items are to be selected, move the icon to the top left corner of the

table and then press MENU button.

1. If all restrictive items are to be released, move the icon to the bottom left

corner and press MENU button twice.

2. If one of the restrictive items is to be selected, press CH+ or CH- button

in an alternate way and press MENU button (for some line) and then

VOL+ or VOL- for option of desired line. Finally press MENU button.

Some item can be deleted by following the same process above.

1. Press RATING button again to quit V-CHIP menu.

MPAA RATING

1. Press RATING button, and the RATING main menu will appear on the screen.

2. When MPAA RATING turns bright red, press MENU button and MPAA RATING

submenu will appear on the screen.

3. If all items are to be selected, press CH+ or CH- button to move the icon to

the top left corner, and then press MENU button.

4. If all selective items are to be deleted, press CH+ or CH- button to move the

icon to the bottom left corner, and then press MENU button twice.

5. Items under or above the designated icon in the submenu can be selected.

6. Press RATING button again to quit V-CHIP menu.

BLOCK OFF

1. Press RATING button, and the RATING main menu will appear on the screen.

2. When BLOCK turns bright red and MENU button is pressed, BLOCK will display

BLOCK OFF and BLOCK ON.

Caution:

BLOCK OFF: Indicating lock on status. Regardless setup of TV RATING and MPAA

RATING, even V-CHIP signals are received during TV programs, this TV

set dos not have the V-CHIP function.

BLOCK ON: Indicating lock off status. When TV RATING and MPAA RATING are

selected, the TV set will have the V-CHIP function when V-CHIP signals

are received in the TV program.

Precautions:

1. Keep the TV set away from heat sources, such as stoves and radiators;

2. Place the TV set in a well ventilated area;

3. Place the TV set in an area free from dusts and corrosive gas;

4. Prevent the TV set from waterdrops, moisture and humidity;

5. Do not place magnetic materials on the TV set;

6. Disconnect the TV set when moving the TV set.

7. When the TV set is turn on during a rainy weather, disconnect the outdoor

antenna and use the indoor antenna attached to the TV set.

8. Disconnect the TV set from power supply source during a power interruption or

when going out on vacation.

MAINTENANCE SERVICE AND TROUBLESHOOTING

TROUBLESHOOTING PROCESS

1. No Light

Check to see if

Fuse3 is normal

No light and sound

Abnorma

Check VD504, C507,

V513, etc.

Check to see if the

collector voltage of

VD554 is 18V

Check N701, N101

etc

Check to see if,

9v,

5v is normal

Check the control

Voltage of V552 or

CPU power

The failure of

Horizontal unit

N101

Normal

Normal Abnormal

Check to see 103V etc.

Voltage is normal

Test to see all terminal

Resistance of load

Is normal

Check switch of

Power unit

Check to see if

rectifying tube

is normal

Change

rectifying tube

Check the

Loader

bnormal

Normal

Abnormal

Normal Abnormal

Normal Normal Abnormal

Abnormal

Normal

Abnormal

Normal

2. No Raster

Abnormal

Check the voltage o

all pins of XP902 is

normal

Heater Resistor

open

Check to see if the

voltage of V433 is

existed?

Check the circuit from

pin13 of N201 to H-

drive

No raster

Whether G2 voltage is normal

Video amplifying

board is abnormal

V433 is not well

welded or open

T431, V433 Or C415,

C416. Care broken

Higher Lower

Inspect the circuit

from pin19, 20,

and 21 of N201 to

video amplifying

board

Check the voltage

of V433 collector is

normal

Inspect T431, R434

etc.

Normal Abnormal

Replace bad components

Check N201

Check N201 and H-Vibration Check +12V power circuit

3. Horizontal Bright Line

Make R451 open. Multimeter is at range RΧ1K. Red

probe connects to ground. Touch No.5 of N401 with

black probe. Bright line flashes for a moment

Horizontal bright line

Check if the vertical deflection

Deflection yoke plug

Inspect +24V

power circuit

Check N201

and N701

Replace components

There is trouble in V-circuit

here is trouble in V-output circuit

Yes No

Check 451R451 Check the voltage at Pin2 of N401

4. No of Redness in Color

Replace CRT,

66118618

Check circuit between

Pin19 of N201 and

XS202

Yes

Change V902 or

weld V902 again

Check to see if voltages of XP902

are normal

Lack of red

Check to see if V902 is open

or not well welded

5. Picture display but no sound

Cut of C601, connect red pen of multi-meter(R*1K) with ground,

and black pen tap Pin1 of N602 if there is snapping

Picture exists but no sound

Power amplifier is normal.

Check N101 and external SIF

circuit

Check muting circuit

and V601\V602

Check to see if +19V

exists

Check SIF circuit and speaker Inspect +19V

power supply

Cut off collection electrode of V602, use

black pen of multimeter tap Pin1 of

N601 if there is snapping sound

Yes No

CIRCUIT DIAGRAM

1. Pane Hint Picture

Picture/Sound IF

Amplifier, Video and

audio signal Processing,

RGB Output Circuits

and H &V Sync pulse

segregation

Sound Power

Amplifier

Main Processor

Infrared Receiver Remote Controller

Audio/Video In/Out

Horizontal

Scan Output

Vertical Scan

Output

2. CIRCUIT DIAGRAM

RL551

SDT-SS-112LMR

T101

HA6019

3. PCB Diagram

CIRCUIT EXPLANATION

1. Principle Integrated Circuits

A1. BH2004D color TV set composed of the following sections

(1) Small signal processing: super monolithic integrated circuits N204

(LA76814A), and memory N901 (AT24C08).

(2) Sound power amplifying: integrated circuits N701 (LA4225).

(3) Horizontal and Vertical scan output circuits: Vertical output integrated

circuits N402 (LA78040), Horizontal output transistor V411 (TT2140),

Horizontal flying back transformer T402 (JF0501-19810).

(4) Switch power supply: switch transformer T501 (BCK-01-90I), power

transistor V503 (2SD4460).

A2. Main integrated circuits:

(1) LA76814A Microprocessor

Picture IF/sound IF/video processing/H and V

Scan/color decoding

(2) LA78040 Vertical output integrated circuits

(3) LA4225 Sound power amplifying integrated circuits

A3. Electrical circuit analysis

1. Microprocessor and Small signal processing: super monolithic integrated

circuits, LA76814A.

LA76814A is super large integrated circuit decoder, containing intermediate

image amplifying, intermediate sound amplifying, horizontal and

vertical scan, small signal processing, color decoding, hi-pressure

tracing and over-load protection, I2C bus control.

Information introducing the functions and testing data for maintenance is listed in

Table 1.

1. N701 LC863424B

PIN Leads Function Voltage

(V) PIN Leads Function Voltage

(V)

1 Auto adjust Enable

Pin 5.1 19 OSD red signal output 0.09

2 Blank 20 OSD greem signal output 0.09

3 IIC data 4.6 21 OSD blue signal output 0.09

4 IIC clock 4.5 22 OSD blank signal output 0.01

5 Earth 0 23 Blank 5.1

CPU

Crystal oscillation

port

2.2 24 MUTE control 0.02

CPU

Crystal oscillation

port

2.75 25 Blank 5.07

8 Power (+5V) 5.1 26 AV option control 2 0.01

9 Plate control input 0.25 27 Av option control 1 0.01

10 AFT signal input 0.3 28 Control signal input 5.1

11 Blank 29

Right channel sound

volume PWM output port 0.01

12 S terminal input test 5.1 30 Left channel sound

volume PWM output port 0.01

13 CPU reset port 5.1 31 Blank

14 OSD filter 3.55 32 Demagnetize 0.007

15 Video signal input 3.2 33 Blank

16 POWER ON/OFF

control signal output 0.03 34 Blank

17 Field pulse input 4.8 35 Blank

18 Line pulse input 4.3 36 Blank

2. N101 LA76814K

PIN Leads Function

Working

Voltage

(V)

PIN Leads Function

Working

Voltage

(V)

1 Video output 2.23 28 Reciprocal pulse input 1.06

2 FM filter output 2.23 29 Reference current 1.69

3 AGC filter 2.22 30 Clock output 0.002

4 Hi AGC output 2.59 31 N.C. 0.002

5 MF input 1.30 32 OSD gain control 3.05

6 MF input 2.83 33 GND 0

7 GND 2.83 34 X ray protection 0.06

8 Power 0 35 ACC KILLER FILTER 0.39

9 FM filter 4.94 36 CHROMA AFC-F 3.49

10 AFT output 1.90 37 CW：3.58MHz OUT 0.54

11 Data bus 2.77 38 2.87

12 Clock bus 4.85 39 Auto color filter 3.2

13 Beam input 4.76 40 Video output option 2.43

14 R input 3.92 41 GND 0

15 G input 0.14 42 Outside video input 2.55

16 B input 0.15 43 Power 5

17 Beam limit 0.08 44 Inside video input 2.77

18 RGB Power 7.94 45 lack strech delay filter 2.6

19 R input 2.21 46 Video output 2.12

20 G input 2.36 47 Auto phase control filter 3.5

21 B input 2.28 48 VCO COLL 4.3

22 Line synchronized

output 0 49 VCO COLL 4.3

23 Field sawtooth

wave output 2.47 50 FILL FILTER 2.24

24 Field incline gain 2.65 51 Outer sound input 2.12

25 Power 5.10 52 SIF output 1.95

26 AFC filter 2.49 53 SIF auto phase control filter 2.38

27 Line output 0.63 54 SIF input 3.14

SERVICE MODE AND ADJUSTING ITEMS AND DATA

Method

a. Press PRO button to enter the adjustment or setup mode.

b. Press CH+ or CH- button to turn page up or down for desired item

options. If a special remote controller is used for options, part of

adjustment items can be selected directly by pressing buttons on the

remote controller.

c. Press VOL+ or VOL- button to alter the value of selected adjustment

items.

d. In the factory production process, the factory adjuster is used for

accelerated adjustment.

Notices for adjustment

OSD Range Ref.

B/W BALANCE

S-BRI 0-127 80

R-BIA 0-255 82

G-BIA 0-255 180

B-BIA 0-255 144

R-DRV 0-127 58

G-DRV 0-15 7

B-DRV 0-127 63

C. B/W 0-3 0

ADJUST

H. PHASE 0-31 17

H.BLK.LEFT 0-7 7

H.BLK.RIGHT 0-7 0

V. SIZE 0-127 39

V. LINE 0-31 10

V. POSE 0-63 56

V. SC 0-31 0

RF. AGC 0-63 20

OSD H.POSI 0-127 10

OSD V.POSI 0-31 3

VOLUME OUT 0-127 100

SETUP

STEREO OPTION 0-1 0

SUB.CONT 0-31 20

SUB.COLOR 0-63 25

SUB.SHARP 0-31 10

SUB.TINT

0-63 32

BLK.STR.DEF (0: On; 1: Off) 0-1 0

AFC GAIN (0: Low; 1: Hi) 0-1 1

V.SEPUP (0: Low; 1: Hi) 0-1 1

CD.MODE (LA76814: 0/1; LA76812: 0~7) 0-1 0

DIGITAL OSD (0: Simulation OSD input; 1: Digit OSD input) 0-1 0

OSD CONT. (0~127) / LA76814 (0~3) 0-3 2

GRAY MOD (0/1) 0-1 0

OSD Description Range Ref.

B.GAM.SEL (0~3)

0-3 3

RG.GAM.DEF (0/1)

0-1 0

FBPBLK.SW (0/1)

0-1 0

BRIGHT ABL.TH Bright. Abl. Threshold (0~7) 0-7 4

EMG.ABL.DEF Emg. Abl. Def (0/1) 0-1 1

BRT.ABL.DEF Brt. Abl. Def (0/1) 0-1 1

MID.STP.DEF Mid. Stp.Def (0/1) 0-1 1

R-Y/B-Y G.BL R-Y/B-Y Gain Balance (0~15)

LA76814, no this function 0-15 8

R-Y/B-Y ANG R-Y/B-Y Angle (0~15) 0-15 8

C.KILL.OFF C_Kill OFF (0/1) 0-1 0

SND.TRAP Sound Trap (0~7) 0-7 4

VOL.FIL “Volume Filter Defeat” 0-1 0

VIF.SYS.SW (0:45.75M; 1:58.75M) LA76814 0-1 0

VIDEO.LEVEL Video Level (0~7)

0-7 7

FM.LEVEL FM Level (0~31) 0-31 16

POWER OPTION 0: 2 starts; 1: memory; 2 or 3: 1 start 0-3 0

SEARCH CHECK 0: w/out start auto search;

1: w/ start auto search

0-1 0

SEARCH SPEED 0: search slow; 1: search fast 0-1 1

AV OPTION 0: w/out AV; 1: 1-way AV input; 2: 2-

way AV input; 3: 3-way AV input 0-3 1

POSITION L/R 0: top left corner; 1: top right corner 0-1 1

BLACK BACK 0: No black back; 1: Black back 0-1 1

BLACK TRANS 0-1 1

V.MUTE P.OFF 0: video output not cut before POWER

OFF;

1: video output cut before POWER OFF

0-1 0

CCD OPTION 0: CCD not used; 1: CCD used 0-1 1

V-CHIP OPTION 0: V-CHIP not used; 1: V-CHIP used 0-1 1

PASSWORD OPT. 0: V-CHIP not used; 1: V-CHIP used 0-1 1

TUNER OPTION 0:TDF-3M3 not used; 1: PHILIP

UV1336B used 0-1 1

SCREEN OPTION 0:w/out curtain; 1: w/ at start; 2: w/ at

close; 3: w/ at start/close 0-3 0

SCREEN TIME 0-7 6

SCREEN HDC 0-63 0

BAND SELECT 0-1 0

CIRCUIT SIGNALS PROCESSING

• MF amplifying circuit

Received by antenna and processed by the high frequency tuner, the television

signals will be transmitted by the tunner as 45.75MHZ signals to sound surface filter

through C112 coupling after being amplified by V102, and then the MF signals of

trapped wave in sound carrier wave from sound surface filter F45U will be sent to

pin 5 and 6 of LA76814.

The MF demodulation circuit of this TV set is completed through PLL carrier

wave generator and outside pressure control oscillator (T101) in LA76814. The MF

frequency is adjusted by T101 adjustment, and output of AFC is generated by a

numerical control IF-PLL circuit, and read and sent to CPU by I2C bus for correction

of MF signals frequency deviation.

The external capacitor of pin 3 decides the time constant of AGC，and high

frequency amplication AGC will be transmitted by I2C bus through Pin 4 for control

of high frequency tuner gain.

• Sound signals processing

The secondary sound MF signals are input via Pin 54 of LA76814, and then

demodulated in PLL tuner through lowpass and limit inside LA76814. After

demodulation, the sound signals will be amplified through inside lowpass and

transmitted via Pin1. Pin 2 is FM output, C121 is deaccentuation capacitor, Pin 9 is

FM detector’s DC filter connector and C117 is filter capacitor.

The external AUDIO signals are input via LA76814 pin 51, controlled by CPU.

A swith inside I2C bus control LA76814 can be used for options of internal and

external signals. The sound signals are transmitted via LA76814 pin 1 to LA4225A

pin 1 via C601 coupling and transmitted from its pin 4, after being amplified by

LA4225A, to the speaker. The mute circuit 1 is comprised of V601, V602 and other

components for Power On and Off mute. Circuit 2 is comprised of CPU mute pin

V603 and other components.

• Line sync processing circuit

The line oscillation circuit of the TV set is fully comprised of LA76814 internal

integrated components. The brightness signals containing compound sync signals

are transmitted to the internal sync seperation circuit for line and field sync pulse.

• Line output circuit

Standard line oscilation pulse is output via Pin 27 to V431 for line drive. T431 is H

(L) drive used to convert the low current and high pressure pulse signals from line

tube into low voltage and large current signals for line export needs. V432 is line

output, C435 and C436 are reciprocal capacitor, C441 is S calibration capacitor,

L441 is line linear indutance and T471 is line output transformer. 240V voltage

needed for field scanning is transmitted via winding 10 of the transformer and

gained after being rectified by VD472. In addition to anode high pressure, screen

grid and focus voltages, the transformer provides 180V video amplifier voltage by

winding 2. VD411, C411, R412, VD412, R414 and C412 form the X ray protection

circuit. R233, C231, R232, R403 and C408 form the beam restriction circuit. The

winding 9 of the transformer provides CRT filament voltage.

• Field sync and output circuit

Field sync seperator produces field sync signals from compound sync signals and

activates the field frequency splitting system. When a certain number field sync

pulse is detected, the field frequency spliting system will start operation for

frequency spliting of the multiple line frequency signals generated by the line

frequency oscilator. The field pulse gained from frequency spliting will be sent to

field sawtooth generator for sawtooth waves, and then transmitted by pin 23. The

output circuit of this TV set is mainly comprised of LA7840 and other components.

• CRT output circuit

The tricolor signals produced by LA76814 will be transmitted to CRT board and then

to the cathode of the TV tube after being amplified by videoamplifier which is

comprised of V902, V912 and V922.

• CCD performance

The CVBS signals produced by LA76814 pin 40 will be amplified and sent to N701

pin 19 via V821 and then processed by software and hardware inside CPU. The

decoded CCD signales will be transmitted to LA76814 pin 14, 15 and 16 via CPU pin

22, 23 and 24.

• V-CHIP performance

Performance of V-CHIP is mainly completed by CPU. The CPU receives grade signals

from the IC bus and executes relative performances and shields those programs of

relative grade.

Integrated circuit reference

1. All integrated circuit voltages

Following voltage data is achieved while the TV set is turned on, and the electric

resistance is achieved when the TV set is turned off. When the status changes, the

data should also be changed. So these data are used as references.

1. N701 LC863424B

PIN Leads Function Voltage

(V) PIN Leads Function Voltage

(V)

1 Auto adjust Enable

Pin 5.1 19 OSD red signal output 0.09

2 Blank 20 OSD greem signal output 0.09

3 IIC data 4.6 21 OSD blue signal output 0.09

4 IIC clock 4.5 22 OSD blank signal output 0.01

5 Earth 0 23 Blank 5.1

CPU

Crystal oscillation

port

2.2 24 MUTE control 0.02

CPU

Crystal oscillation

port

2.75 25 Blank 5.07

8 Power (+5V) 5.1 26 AV2 0.01

9 Plate control input 0.25 27 Av option control 1 0.01

10 AFT signal input 0.3 28 Control signal input 5.1

11 Blank 29

Right channel sound

volume PWM output port 0.01

12 S terminal input test 5.1 30 Left channel sound

volume PWM output port 0.01

13 CPU reset port 5.1 31 Blank

14 OSD filter 3.55 32 Demagnetize 0.007

15 Video signal input 3.2 33 Blank

16 POWER ON/OFF

control signal output 0.03 34 Blank

17 Field pulse input 4.8 35 Blank

18 Line pulse input 4.3 36 Blank

2. N101 LA76814K

PIN Leads Function Voltage

(V) PIN Leads Function

Voltage

(V)

1 Video output 2.23 28 Reciprocal pulse input 1.06

2 FM filter output 2.23 29 Reference current 1.69

3 AGC filter 2.22 30 Clock output 0.002

4 Hi AGC output 2.59 31 N.C. 0.002

5 MF input 1.30 32 OSD gain control 3.05

6 MF input 2.83 33 Earth 0

7 Earth 2.83 34 X ray protection 0.06

8 Power 0 35 ACC KILLER FILTER 0.39

9 FM filter 4.94 36 CHROMA AFC-F 3.49

10 AFT output 1.90 37

CW：3.58MHz OUT 0.54

11 Data bus 2.77 38 2.87

12 Clock bus 4.85 39 Auto color filter 3.2

13 Beam input 4.76 40 Video output option 2.43

14 R input 3.92 41 Earth 0

15 G input 0.14 42 Outside video input 2.55

16 B input 0.15 43 Power 5

17 Beam limit 0.08 44 Inside video input 2.77

18 RGB power 7.94 45 Black strech delay filter 2.6

19 R output 2.21 46 Video output 2.12

20 G output 2.36 47

Auto phase control

filter 3.5

21 B output 2.28 48 VCO COLL 4.3

22 Line synchronized

output 0 49 VCO COLL 4.3

23 Field sawtooth wave

output 2.47 50 FILL FILTER 2.24

24 Field incline gain 2.65 51 Outer sound input 2.12

25 Power 5.10 52 SIF output 1.95

26 AFC filter 2.49 53

SIF auto phase control

filter 2.38

27 Line output 0.63 54 SIF input 3.14

ADJUSTMENT

1. Safety Precautions

1. It is safe to adjust after using insulating transformer between the power supply

and chassis input to prevent the risk of electric shock and protect the

instrument.

2. Never disconnect leads while the TV receiver is on.

3. Don't short any portion of circuits while power is on.

4. The adjustment must be done on the correct appliances. But this is changeable in

view of productivity.

2. Adjustment procedure

The chassis of this TV set uses Sanyo IC with the latest digital bus processing

technology. The adjustment points are fewer and the adjustment is simpler. The

adjustment method is as follows:

• +B: 104± 1V adjustment

1) Switch on the power and connect NTSC circular signals to the tuner.

2) Adjust variable resistor RP551 until the voltage of the main power is 104±1V.

• Screen voltage adjustment

1) Switch on the power and receive NTSC system circular signal. Warm up the TV

set for 15 min.

2) Enter the adjustment state. Press the “MUTE” button, then a bright horizontal

line appears. Adjust screen potentiometer to let the horizontal line just appears.

• Focus adjustment

1) Receive electronic circular signal.

2) Set picture mode on standard mode.

3) Adjust focus potentiometer until the optimum picture is achieved.

• White balance adjustment

1) Set the picture mode on standard mode.

2) Enter the D state and adjust RCUT, GCUT, BCUT, GDRV and BDRV.

3) Coordinate of reference white color: (X=0.281, Y=0.311).

• Adjustment of horizontal and vertical position and size

1) Switch on the power and connect the signals to the tuner to receive NTSC

system circular signal.

2) Enter the D state. Adjust HPOS to change the horizontal position and V. POSE to

change the vertical position. Adjust V.SIZE to change the vertical size until the

vertical size is 90-92%. Horizontal size is related to the capacitor C436. Hold the

horizontal size is 90-92%.

INFORMATION OF RESISTORS AND CAPACITORS

RESISTORS & CAPACITORS-PARTS NO.CODE

Notes: 1. Part numbers are indicated on most mechanical parts.

Please use this part number for parts orders.

2.The unit of resistance is Ω (ohm). K=1000Ω, M=1000KΩ

3.The unit of capacitance is µF (microfarad). P=10-6µF.

Numbering system of Capacitor

Example

CL42 ----- 17 ---- 50V ---- 2F4 ---- 104 * ---- Z

Type Voltage Value (PF) Tolerance

CL21X ---- 100V ---- 223 * ---- J

Type Voltage Value (PF) Tolerance

CL110X ---- 25V ---- 100µF ± 20%

Type Voltage Value Tolerance * 104 =10×104

223

=22×103

Numbering system of Capacitor

Example

RY17S ---- 2W ---- 390 ---- J ---- 05-E-A

Type Wattage Value(Ω) Tolerance

RS11 ---- 1/2W ---- 1.8K ---- K

Type Wattage Value Tolerance

ABBREVIATION OF PART NAME AND DESCRIPTION

RESISTOR CAPACITOR

PART NAME & DESCRIPTION

TYPE ALLOWANCE

T Carbon F ±1%

S Solid J ±5%

J Metal K ±10%

Y Oxide M ±20%

F Fuse G ±2%

PART NAME & DESCRIPTION

TYPE ALLOWANCE

C Ceramic J ±5%

T Ceramic K ±10%

L Film L ±15%

D Electro-analysis M ±20%

A Tantalum P +100%-0%

Z +80%-0%

TERMINAL VIEW OF TRANSISTORS

BCE

KSR1010TA

KSR2010TA

2SD18887YD

2SC4544----B-A

2SB1569A-E----B-A EXPORT

2SP2400A-E----B-A EXPORT

2SC3853(2SC3852)----E-A

3DD2553----B-A

3CA688----E-A

2SC3853(2SC3852)----B-A

2SC1815-Y------F

2SA1015-Y------F

2SC752GTM-Y------F EXPORT

2SC2878-A(TEM)------F EXPORT

RN1204(DTC144ESATP) EXPORT

2SA562TM-Y------F

2SC3355------F EXPORT

TV 8888 25rd 42

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