AOC D42H931G Schematic

42″LCD TV AOC D42H931G

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Service

31~56 KHz

TABLE OF CONTENTS

Description Page Description Page

Table of Contents.......……....................................…........1

Important Safety Notice.......................................……......2

Revision List…………………………………………………3

1. General Specification..............................……...…........4

2. Operating Instructions………………...…….……….......5

2.1 The Use of Remote Control…….…..……….…….......5

2.2 To Use the Menu….....…………………….……….......6

2.3 How to Connect……..……………….…….……….....15

2.4 Front Panel Control Knobs…….………….……….....21

3. Input/Output Specification…………....................…....24

4. Mechanical Instructions…………………….................26

5. Repair Flow Chart ……………………….…….…….....29

6. PCB Layout ………………..…………………....….......35

6.1 Main Board…………..………………...…….…….......35

6.2 Power Board………………..…….…….……….......37

SAFETY NOTICE

ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS

6.3 Inverter Board……………..…….…….……….......40

6.4 Tuner Board…………………………..……….......41

6.5 Key Board………………………..……..……….......42

6.6 IR Board………………………….……..……….......42

7. Adjustment……..………………………….................43

8. Block Diagram.…….................................................44

9. Schematic Diagram…..…………....………………...45

9.1 Main Board…………………………………...….......45

9.2 Power Board…………..….….……...………….......55

9.3 Inverter Board…………..….……...………….......60

9.4 Tuner Board……………….…….…………….........61

9.5 Key Board………………………..……..……….......71

9.6 IR Board……...………….……….…………….........72

10. Exploded View………………………………….…...73

11. BOM List……………….………………….………….75

Horizontal Frequency

AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING

ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.

CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

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Important Safety Notice

Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service

procedures recommended by AOC and described in this service manual are effective methods of performing service

operations. Some of these service operations require the use of tools specially designed for the purpose. The

special tools should be used when and as recommended.

It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in

order to minimize the risk of personal injury to service personnel. The possibility exists that improper service

methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE

NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in

which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not

undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not

recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the

equipment will be jeopardized by the service method selected.

Hereafter throughout this manual, AOC Company will be referred to as AOC.

WARNING

Use of substitute replacement parts, which do not have the same, specified safety characteristics might create

shock, fire, or other hazards.

Under no circumstances should the original design be modified or altered without written permission from AOC.

AOC assumes no liability, express or implied, arising out of any unauthorized modification of design.

Servicer assumes all liability.

FOR PRODUCTS CONTAINING LASER:

DANGER-Invisible laser radiations when open AVOID DIRECT EXPOSURE TO BEAM.

CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may

result in hazardous radiation exposure.

CAUTION -The use of optical instruments with this product will increase eye hazard.

TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S

REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF

THIS SERVICE MANUAL.

Take care during handling the LCD module with backlight unit

-Must mount the module using mounting holes arranged in four corners.

-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.

-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to

the panel.

-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).

-Make certain that treatment person’s body is grounded through wristband.

-Do not leave the module in high temperature and in areas of high humidity for a long time.

-Avoid contact with water as it may a short circuit within the module.

-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may damage the panel.)

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Revision List

Version Release Date Revision Instructions TPV Model

A00 May 17,2010 Initial Release E429MNNS4WB16N

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1. General Specification

Modelo D42H931G

Tamanho da Tela (Diagonal)

Resolução

Saída Áudio

Voltagem

Consumo de Energia (Operação Normal) (Standby)

Dimensões (com base) (L)x(A)x(P) (mm)

Dimensões para Suporte de Parede

Considerações Ambientais Temperatura de Operação Umidade de Operação Temperatura de Armazenamento Umidade de Armazenamento

42”, 1067mm

1920x1080

7Wx2

AC100-240V 50/60Hz

250W

1016x678x276

200x200mm M6x10mm. 4pçs

0ºC~35ºC (32ºF~95ºF) 20~80%

-10ºC~50ºC (14ºF~122ºF) 20~80%

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2. Operating Instructions

2.1 The Use of Remote Control

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2.2 To Use the Menu

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2.3 How to Connect

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2.4 Front Panel Control Knobs

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3. Input/Output Specification

3.1 RGB Signal Input

15 - Pin Color Display Signal Cable

Pin No. Description Pin No. Description

1 Red Video 9 No Pin!

2 Green Video 10 Sync Ground

3 Blue Video 11 SDA(Remote Control)

4 SCL(Remote Control) 12 Serial Data for DDC

5 Ground 13 H-Sync.

6 Red Video Ground 14 V-Sync.

7 Green Video Ground 15 Serial Clock for DDC

8 Blue Video Ground

3.2 Digital RGB Connector Pin Assignments

Pin No. Description Pin No. Description

1 TMDS Data2+ 2 TMDS Data2 Shield

3 TMDS Data2- 4 TMDS Data1+

5 TMDS Data1 Shield 6 TMDS Data1-

7 TMDS Data0+ 8 TMDS Data0 Shield

9 TMDS Data0- 10 TMDS Clock+

11 TMDS Clock Shield 12 TMDS Clock-

13 CEC 14 NC

15 SCL 16 SDA

17 DDC/CEC Ground 18 +5V Power

19 Hot Plug Detect

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3.3 Compatible Mode Table

Analog RGB Input Signal Timing

Dots ×

Lines

720×400 31.47 70 NEG POS YES YES YES YES

640×480 31.47 59.94 NEG NEG YES YES YES YES

640×480 37.5 75 NEG NEG YES YES YES YES

640×480 37.86 72.81 NEG NEG YES YES YES YES

800×600 37.88 60.32 POS POS YES YES YES YES

800×600 46.88 75 POS POS YES YES YES YES

800×600 48.08 72.19 POS POS YES YES YES YES

1024×768 48.4 60 NEG NEG YES YES YES YES

1360×768 47.7 60 POS POS YES YES YES YES

1440×900 55.94 60 NEG POS YES YES YES YES

Horizontal Vertical Sync Polarity Presence Screen Mode

Frequency Frequency

(kHz) (Hz) (4:3) (16:9)

Horizontal Vertical Horizontal Vertical

Normal Full

HDMI Input Signal Timing

VESA MODES

Horizontal Vertical

Nominal

Mode Resolution Total

720P

1080i 1920X1080i 33.75 60 74.25

480P 720X480P 31.54 60 27

480i 720X480i 15.75 60 13.51

1280×720P

45 60 74.25

Frequency

(KHz)

Sync

Polarity

Nominal

Freq.

(Hz)

Sync

Polarity

Nominal

Pixel Clock (MHz)

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4. Mechanical Instructions

1. Remove the screws to remove the stand ass’y.

2. Remove the screws to remove rear cover.

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3. Remove the screws to remove main board, tuner board, power board and inverter board.

4. Remove the screws to remove bracket and separate bezel and panel.

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5. Remove the screws to remove key board, IR board and speakers.

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5. Repair Flow Chart

1. No power

No power (LED “Off”)

Check the AC input and the

ower is “ON”?

Yes

Power board output=5V?

Yes

Check the IR board and LED

Replace the IR board

Replace the main board

Power “On”

Replace the power board

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2. Can’t start

Can’t start（LED red）

Power board output＝24V?

Yes

Check the power key is under control?

Check the IR receiver is normal?

Replace the power board

Yes

Replace the key board

Yes

Replace the IR board

Replace the main board

Replace the Power board

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