AOC LC32W053, LC42H053 Service Manual

26″&31.5″&42″LCD TV AOC D26(32)W931/LC32W053/LC42H053

Service

31~60 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

3. Input/Output Specification…………......................…....6

4. Mechanical Instructions……………..……….................9

5. Repair Flow Chart ……………………….…….…….....18

6. PCB Layout ………………..…………………....….......25

6.1 Main Board……………..……………...…….…….......25

6.2 Power Board……...…………..…….…….……….......27

6.3 Key Board…………………………..……..……….......41

SAFETY NOTICE

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

6.4 IR Board………………………….……..……….......41

6.5 LVDS to FFC Board………….….……..……….......43

7. Adjustment……..………………………….................44

8. Block Diagram.…….................................................46

9. Schematic Diagram…..…………....………………...48

9.1 Main Board…………………………………...….......48

9.2 Power Board…………..….….……...………….......65

9.3 Key Board……………….……….…………….........73

9.4 IR Board……...………….……….…………….........75

9.5 LVDS to FFC Board………….….……..……….......78

10. Exploded View………………………………….…...79

11. BOM List……………….………………….………….87

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

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.)

Revision List

Version Release Date Revision Instructions Customer Model TPV Model

D26W931 E269STNS4WB36N

D32W931 E329MTNS4WB36N

A00 Jul.26,2010 Initial Release

LC32W053 E32AATNSW3B26N

LC42H053 E42AATNSW3B26N

1. General Specification

Please refer to user manual.

2. Operating Instructions

Please refer to user manual.

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 HDMI Digital 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

3.3 Compatible Mode Table

Analog RGB Input Signal Timing D26W931/D32W931/LC42H053

Horizontal Vertical Sync Polarity Presence Screen Mode

Dots × Lines

720×400 31.47 70.00 640×480 31.47 59.94 640×480 37.50 75.00 640×480 37.86 72.81 800×600 37.88 60.32 800×600 46.88 75.00 800×600 48.08 72.19

832×624 49.73 74.55 1024×768 48.40 60.00 1024×768 60.02 75.03 1024×768 56.48 70.07 1360×768 47.70 60.00

Frequency Frequency

(kHz) (Hz)

Horizontal Vertical Horizontal Vertical

NEG POS YES YES YES YES NEG NEG YES YES YES YES NEG NEG YES YES YES YES NEG NEG YES YES YES YES POS POS YES YES YES YES POS POS YES YES YES YES POS POS YES YES YES YES NEG NEG YES YES YES YES NEG NEG YES YES YES YES POS POS YES YES YES YES NEG NEG YES YES YES YES POS POS YES YES YES YES

Normal

(4:3)

LC32W053

VESA MODES

Horizontal Vertical

Nominal

Mode Resolution Total

640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175

VGA

SVGA

XGA

WXGA 1360x768@60Hz 1792X795 47.712 P 60.015 P 85.5

640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500 640x480@75Hz 840 x 500 37.5 N 75 N 31.500 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322 800x600@56Hz 1024 x 625 35.156 P 56.25 P 36.000 800x600@60Hz 1056 x 628 37.879 P 60.317 P 40.000 800x600@72Hz 1040 x 666 48.097 P 72.188 P 40.000

800x600@75Hz 1056 x 625 46.875 P 75 P 49.5 1024x768@60Hz 1344x806 48.363 N 60.004 N 65.000 1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000 1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750

Frequency

(KHz)

Sync

Polarity

Nominal

Freq.

(Hz)

Sync

Polarity

Nominal

Clock (MHz)

Full

(16:9)

Pixel

HDMI Input Signal Timing D26W931/D32W931

VESA MODES

Horizontal Vertical

Nominal

Mode Resolution Total

720P 1280×720P 45.00 60 74.25

1080i 1920X1080i 33.75 60 74.25

480P 720X480P 31.54 60 27.00

480i 720X480i 15.75 60 13.51

Frequency

(KHz)

Sync

Polarity

Nominal

Freq.

(Hz)

Sync

Polarity

Nominal

Pixel Clock (MHz)

LC32W053/LC42H053

Nominal

Mode Resolution Total

1080P 1920X1080 67.5 60 148.50

720P 1280×720 1650 x 750 45.00 60 74.25

1080i 1920X1080 2200 x 1125 33.75 60 74.25

480P 720X480 858 x 525 31.50 60 27.03

480i 720X480 1716 x 525 15.75 60 13.51

Horizontal

Frequency

(KHz)

Nominal Vertical

Frequency

(Hz)

Nominal

Pixel Clock (MHz)

4. Mechanical Instructions

D26W931

1. Remove the screws to remove the rear cover ass’y and stand ass’y.

2. Remove the screws to remove main board, power board, bracket and speakers and separate panel and bezel.

3. Remove the screws to remove IR board and key board.

D32W931

1. Remove the screws to remove the rear cover ass’y and base ass’y.

2. Remove the screws to remove main board, power board and bracket.

3. Remove the screws to remove inverter board, speakers and bracket and separate panel and bezel.

4. Remove the screws to remove key board and IR board.

LC32W053

1. Remove the screws to remove the rear cover.

2. Remove the screws to remove the stand base, main board, power board, inverter board and LVDS to FFC board.

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

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

LC42H053

1. Remove the screws to remove the rear cover.

2. Remove the screws to remove the stand base.

3. Remove the screws to remove main board and power board.

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

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

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

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

3. Abnormal Display

Abnormal Display

Check the source

Yes

Enter factory mode to do

“EEPROM initial”&“Reset”

Reset the source

Check the main board

Yes

Check the LVDS cable

Yes

Check the panel

Replace the panel

Replace the main board

Replace the LVDS cable

4. No display

No display (LED blue)

Check TV is under control and power on/off by remote control and power key?

Yes

Check the LVDS cable

Yes

Check the backlight is

“On”?

Reinsert or replace the LVDS cable

Check the B/L

signal is available?

Yes

Replace the main board

Replace main board

Panel Vcc = 5V?

Yes

Replace the Panel

Replace the main board

Power board output＝24V?

Yes

Replace the Panel

Replace the power board

5. Sound problem

No sound or sound abnormal

Check the audio source connection

and the TV system are correct?

Yes

Check the TV is muted, adjust the

volume or enter the menu to reset?

Reinsert the audio cable or change the TV system

Enter factory mode to do “Reset”

Check the cable between the speakers and main board is OK?

Yes

Check the speaker resistance value is in spec (Remark: The value is marked on the speaker)?

Yes

Replace the cable

Replace the main board

Replace the speaker

6. Remote control malfunction

Remote Control malfunction

Check the remote control battery is not properly placed or no power?

Use the other remote controls

Whether the IR board is

abnormal?

Replace the main board

Yes

Replace the battery

Yes

Replace the remote control

Yes

Replace the IR board

7. OSD is unstable or can’t work normally

OSD is unstable or can’t work normally

Key board connected properly?

Yes

Buttons are OK?

Yes

Key board is OK?

Yes

Enter factory mode to do “Reset”

Reconnect the key board

Replace the button function

Replace the key board

Replace the main board

6. PCB Layout

6.1 Main Board

715G3787M0G000005K

6.2 Power Board

D26W931 715G2907 1 3

28 29

D32W931 715G3332 1

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