AOC D32W931 User manual

26″&31.5″&42″LCD TV AOC D26(32)W931/LC32W053/LC42H053
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Service
Service
Service
Horizontal Frequency
31~60KHz
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
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
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
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

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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 Customer Model TPV Model
A00 Jul.26,2010 Initial Release
D26W931 E269STNS4WB36N
D32W931 E329MTNS4WB36N
LC32W053 E32AATNSW3B26N
LC42H053 E42AATNSW3B26N

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1. General Specification
Please refer to user manual.

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2. Operating Instructions
Please refer to user manual.

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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 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

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3.3 Compatible Mode Table
Analog RGB Input Signal Timing
D26W931/D32W931/LC42H053
Dots × Lines
Horizontal Vertical Sync Polarity Presence Screen Mode
Frequency Frequency Horizontal Vertical Horizontal Vertical Normal
(4:3)
Full
(16:9)
(kHz) (Hz)
720×400 31.47 70.00
NEG POS YES YES YES YES
640×480 31.47 59.94
NEG NEG YES YES YES YES
640×480 37.50 75.00
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 75.00
POS POS YES YES YES YES
800×600 48.08 72.19
POS POS YES YES YES YES
832×624 49.73 74.55
NEG NEG YES YES YES YES
1024×768 48.40 60.00
NEG NEG YES YES YES YES
1024×768 60.02 75.03
POS POS YES YES YES YES
1024×768 56.48 70.07
NEG NEG YES YES YES YES
1360×768 47.70 60.00
POS POS YES YES YES YES
LC32W053
VESA MODES
Horizontal Vertical
Mode Resolution Total
Nominal
Frequency
(KHz)
Sync
Polarity
Nominal
Freq.
(Hz)
Sync
Polarity
Nominal
Pixel
Clock
(MHz)
VGA
640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175
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
SVGA
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
XGA
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
WXGA 1360x768@60Hz 1792X795 47.712 P 60.015 P 85.5

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HDMI Input Signal Timing
D26W931/D32W931
VESA MODES
Horizontal Vertical
Mode Resolution Total
Nominal
Frequency
(KHz)
Sync
Polarity
Nominal
Freq.
(Hz)
Sync
Polarity
Nominal
Pixel
Clock
(MHz)
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
LC32W053/LC42H053
Mode Resolution Total
Nominal
Horizontal
Frequency
(KHz)
Nominal Vertical
Frequency
(Hz)
Nominal
Pixel
Clock
(MHz)
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

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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.

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

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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.

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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.

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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.

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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.

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LC42H053
1. Remove the screws to remove the rear cover.
2. Remove the screws to remove the stand base.

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

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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.

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5. Repair Flow Chart
1. No power
No power (LED “Off”)
Check the AC input and
the
p
ower is “ON”? Power “On”
Check the IR board and LED
Replace the IR board
Replace the main board
Power board output=5V? Replace the power board
No
Yes
No
Yes
No

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2. Can’t start
Can’t start（LED red）
Replace the main board
Replace the Power board
No
Yes
No
Yes
No
No
Power board output＝24V?
Check the power key is under control?
Check the IR receiver is normal?
Replace the power board
Replace the key board
Yes
Replace the IR board

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3. Abnormal Display
Abnormal Display
Reset the source
Check the source
Check the panel
Replace the main board
Replace the LVDS cable
Replace the panel
No
No
No
Yes
Yes
Yes
No
No
Check the main board
Enter factory mode to do
“EEPROM initial”&“Reset”
Check the LVDS cable