AOC L37W431, SVPEX52 Schematic
37’’ LCD TV Envision L37W431
Service
Service
Service
31.5- 49 KHz
TABLE OF CONTENTS
Description Page Description Page
Table Of Contents.......…….............................…........1
Revision List……………………………………………....2
Important Safety Notice.......................................……......3
1. General Specification..............................………........4
2. Operating Instructions…………………….……….......6
2.1. The Use Of Remote Control…….………….…….......6
2.2. Front Panel Control Knobs……………….……….....7
2.3. To Use The Menu…...…………………….……….......8
2.4. How To Connect…….…………………….……….....16
3. Input/Output Specification…………....................…....19
3.1. Input Signal Connector………………………….....19
3.2. Factory Preset Display Modes…………………….20
4. White-Balance, Luminance Adjustment...........21
5. Mechanical Instructions…………………….................23
6. Repair Flow Chart ……………………….…….…….....26
7. PCB Layout …………..………………....….......31
7.1. Main Board…………..………….……….......31
7.2. Power Board…………..………….……….......34
7.3. Audio Board………………………………….....37
7.4. Tuner Board…………………..……….......38
7.5. Key Board…………………….……….......39
7.6. IR Board………………………….……….......39
8 Block Diagram…………………………………..40
9. Schematic………………………………………...41
9.1 Main Board……………………………….......41
9.2. Power Board…………….……….…………...52
9.3. Tuner Board……………………….…….......53
9.4. Audio Board…………………………….......57
10. Exploded View..……………............................58
11. BOM List……………….……………………….60
12. Different Parts List……………………………...86
Horizontal Frequency
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
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37’’ LCD TV Envision L37W431
Revision List
Version Release Date Revision History TPV Model
A00 Dec.-23-2006 Initial Release E376ATNSD1AENP
A01 Mar.-19-2007 Add TPV model in item 12 E376ATNSW1A2N
A02 May.-29-2007 Third Release E376ATNCW1GLN
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37’’ LCD TV Envision L37W431
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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37’’ LCD TV Envision L37W431
1. General Specification
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37’’ LCD TV Envision L37W431
2. Operations Instructions
2.1 The Use Of Remote Control
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37’’ LCD TV Envision L37W431
2.2 Front Panel Control Knobs
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37’’ LCD TV Envision L37W431
2.3 OSD Operations
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2.4 How To Connect
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37’’ LCD TV Envision L37W431
3. Input/Output Specification
3.1 Input Signal connector
This procedure gives you instructions for installing and using the LCD TV display.
Lay the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire power cord
must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical
conduct ground. If the AC outlet in your location does not have provisions for the grounded type plug, the installer
should attach the proper adapter to ensure a safe ground potential.
Connect the 15-pin D-SUB color display shielded signal cable to your signal system device and lock both screws on
the connector to ensure firm grounding. The connector information is as follow:
1
6
11 15
5
10
15 - Pin Color Display Signal Cable
Pin No. Description
1 Red Video
2 Green Video
3 Blue Video
4 Not Used
5 GROUND
6 Red Video Ground
7 Green Video Ground
8 Blue Video Ground
9 Mandatory +5V Supply for PC Bypass
10 Sync. Ground
11 Not Used
12 Serial Data for DDC
13 Horizontal Sync.
14 Vertical Sync.
15 Data Clock for DDC
Apply power to the display by turning the power switch to the "ON" position and allow about ten seconds for Panel
warm-up. The Power-On indicator lights "Green" when the display is on.
With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness and
contrast to the most pleasing display, or press auto-adjust to get the best picture-quality.
This TV (with PC function) has power saving function following the VESA DPMS. Be sure to connect the signal
cable to the PC.
If your TV requires service, it must be returned with the power cord.
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37’’ LCD TV Envision L37W431
3.2 Factory Preset Display Modes:
Vertical
Dots × Lines
720 × 400 70.1 31.5 NEG POS YES YES YES NO
640 × 480
Frequency
(Hz)
59.9 31.5 NEG NEG YES YES YES NO
75.0 37.5 NEG NEG YES YES YES NO
Horizontal
Frequency
(kHz)
Sync Polarity Presence Screen Mode
Horizontal Vertical Horizontal Vertical
Normal
(4:3)
FULL
(16:9)
800 x 600
1024 x 768 60.0 48.36 NEG NEG YES YES YES NO
1360 x 768 60.0 47.36 POS NEG YES YES NO YES
60.0 37.9 POS POS YES YES YES NO
75.0 46.87 POS POS YES YES YES NO
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37’’ LCD TV Envision L37W431
4. White Balance, Luminance Adjustment
Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.
Before started adjust white balance ,please setting the Chroma-7120 MEM. Channel 1 to 9300 color, MEM.
channel 2 to 6500 color, and MEM. channel 3 to AV/TV mode, channel 4 to HDTV-Tscaler mode ; channel 5 to
HDTV-YPbPr mode ( our 9300 parameter is x = 283 ± 20, y = 297 ± 20, Y = 370 ± 20 cd/m2 ; 6500 parameter is x =
313 ± 20, y = 329 ± 20, Y = 370± 20 cd/m
20, y = 297 ± 20, Y = 450± 7 cd/m
2
Color Temp.
9300 6500
x 0.283 0.313 0.283 0.283 0.283
y 0.297 0.329 0.297 0.297 0.297
Y 370 370 450 450 450
How to setting MEM.channel you can reference to Chroma-7120 user guide or simple use “ SC” key and “ NEXT”
key to modify x,y,Y value and use “ID” key to modify the TEXT description
Following is the procedure to do white-balance adjust
Press Number key 100 ◊ 9 ◊ 9 ◊ 9 will into the factory mode, and press Menu key the OSD will show menu and a word
F at Right top of Menu.
In the factory mode select MORE function will into Bias and Gain adjustment.
1. ADC Adjustment:
AL ◊ Auto level adjust.
RG, GG, BG ◊ R, G, B Gain adjusts.
RB, GB, BB ◊ R, G, B Bias adjusts.
2. SCALER Adjustment:
CO, BR ◊ Contrast and Brightness adjust.
RG, GG, BG ◊ R, G, B Gain adjusts.
RB, GB, BB ◊ R, G, B Bias adjusts.
II. Bias (Low luminance) adjustment:
1. Set the raster pattern (Black pattern with 1024×768) Input.
2. Set the contrast and brightness as RECALL
3. Adjust the brightness on OSD until chroma 7120 measurement reach the lowest value.
III. Gain adjustment :
A. Adjust 9300 color-temperature:
1. Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>370 cd/m
2. Switch the chroma-7120 to RGB-mode (with press “MODE” button )
3. Switch the MEM.channel to Channel 1 ( with up or down arrow on chroma-7120 )
4. The LCD-indicator on chroma-7120 will show x = 283 ± 20, y = 297 ± 20, Y = 370 cd/m
5. Adjust the Color(user)Mode: RED on OSD window, until chroma 7120 indicator reached the value R=100
6. Adjust the Color (user) Mode: GREEN on OSD window, until chroma-7120 indicator reached the value
G=100
7. Adjust the Color (user) Mode: BLUE on OSD window, until chroma-7120 indicator reached the value
B=100
8. Repeat above procedure (Item 5,6,7) until chroma-7120 RGB value meet the tolerance =100±2
9. Switch the chroma-7120 to xyY mo de With press “MODE” button
10. Press Color (9300) on OSD window to save the adjustment result
2 ;
)
PC mode
AV/TV mode, HDTV-Tscalar, HDTV-YpbPr mode parameter is x = 283 ±
AV mode HDTV-Tscaler HDTV-YPbPr
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2
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37’’ LCD TV Envision L37W431
B. Adjust 6500 color-temperature:
1. Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>370 cd/m
2. Switch the chroma-7120 to RGB-mode (with press “MODE” button )
3. Switch the MEM.channel to Channel 2 (with up or down arrow on chroma-7120)
4. The lcd-indicator on chroma-7120 will show x = 313 ± 20, y = 329 ± 20, Y = 370 cd/m
5. Adjust the Color(user)Mode: RED on OSD window, until chroma 7120 indicator reached the value R=100
6. Adjust the Color(user)Mode: GREEN on OSD window, until chroma-7120 indicator reached the value
G=100
7. Adjust the Color(user)Mode: BLUE on OSD window, until chroma-7120 indicator reached the value B=100
8. Repeat above procedure ( item 5,6,7) until chroma-7120 RGB value meet the tolerance =100 ± 2
9. switch the chroma-7120 to xyY mode With press “MODE” button
10. Press Color(6500) on OSD window to save the adjustment result
C.Adjust AV mode color-temperature:
1. Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>450 cd/m
2. Switch the chroma-7120 to AV-mode (with press “MODE” button)
3. Switch the MEM.channel to Channel 3 (with up or down arrow on chroma-7120)
4. The lcd-indicator on chroma-7120 will show x = 283 ± 20, y = 297 ± 20, Y = 450 ± 20 cd/m
5. Adjust the Color (user) Mode: RED on OSD window, until chroma 7120 indicator reached the value R=100
6. Adjust the Color (user) Mode: GREEN on OSD window, until chroma-7120 indicator reached the value
G=100
7. Adjust the Color (user) Mode: BLUE on OSD window, until chroma-7120 indicator reached the value B=100
8. Repeat above procedure (item 5, 6, 7) until chroma-7120 RGB value meet the tolerance =100 ± 2
9. Switch the chroma-7120 to xyY mode with press “MODE” button
10. Press MENU on OSD window to save the adjustment result
D. Adjust HDTV-Tscaler mode color-temperatures:
1. Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>450 cd/m
2. Switch the chroma-7120 to HDTV-Tscaler-mode (with press “MODE” button)
3. Switch the MEM.channel to Channel 4 (with up or down arrow on chroma-7120)
4. The LCD-indicator on chroma-7120 will show x = 283 ± 20 y = 297 ± 20, Y = 450 ± 20 cd/m
5. Adjust the Color (user) Mode: RED on OSD window, until chroma 7120 indicator reached the value R=100
6. Adjust the Color (user) Mode: GREEN on OSD window, until chroma-7120 indicator reached the value
G=100
7. Adjust the Color (user) Mode: BLUE on OSD window, until chroma-7120 indicator reached the value B=100
8. Repeat above procedure (item 5, 6, 7) until chroma-7120 RGB value meet the tolerance =100 ± 2
9. Switch the chroma-7120 to xyY mode with press “MODE” button
10. Press MENU on OSD window to save the adjustment result
E. Adjust HDTV-YPbPr mode color-temperatures:
1. Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>450 cd/m
2. Switch the chroma-7120 to HDTV-YPbPr-mode (with press “MODE” button)
3. Switch the MEM.channel to Channel 11 (with up or down arrow on chroma-7120)
4. The lcd-indicator on chroma-7120 will show x = 283 ± 20 y = 297 ± 20, Y = 450 ± 20 cd/m
5. Adjust the Color (user) Mode: RED on OSD window, until chroma 7120 indicator reached the value R=100
6. Adjust the Color (user) Mode: GREEN on OSD window, until chroma-7120 indicator reached the value
G=100
7. Adjust the Color (user) Mode: BLUE on OSD window, until chroma-7120 indicator reached the value B=100
8. Repeat above procedure (item 5, 6, 7) until chroma-7120 RGB value meet the tolerance =100 ± 2
9. Switch the chroma-7120 to xyY mode with press “MODE” button
10. Press MENU on OSD window to save the adjustment result
Turn the POWER-button off to on to quit from factory mode (in USER-mode, the OSD window location was
placed at middle of screen)
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37’’ LCD TV Envision L37W431
5. Mechanical Instructions
Step Figure Description
Lay the
Preparation
LCD-TV on a
flat, soft and
clean surface.
Remove
the back
cover
Remove the
fourteen
screws to
remove the
back cover.
Remove
the shield
and stand
Remove the
17 screws to
remove the
shield and
stand
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37’’ LCD TV Envision L37W431
Remove
the shield
Remove
the main
board &
power
board
Remove the
10 screws to
remove the
shield.
Remove the
12 screws and
8 interfaces.
Remove
the key pad
Remove the
main frame
Remove the
two screws to
remove the
key pad.
Remove the
16 screws to
remove the
main frame.
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37’’ LCD TV Envision L37W431
Remove the
Remove
the bezel
10 screws to
remove the
bezel.
The panel
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37’’ LCD TV Envision L37W431
6. Repair Flow Chart
1. Can not start (LED indicator yello w)
No LED Indicate Check power cord and board
OK
Check key board
OK
Check 5V_SB
OK
Check 3.3V_SB
OK
Check PWR_ON Signal
OK
Check main board power supply
NG
NG
NG
Check U702
Repair the keyboard
Check power board power supply
Check Q704, Q705, Q706, Q709
Check U402, U401
Check I2C communication
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37’’ LCD TV Envision L37W431
2. No Display (LED indicator green)
Check signal source
OK
Check LVDS cable
OK
NG
Reset the source
NG
Replace or reset LVDS cable
Check inverter board 24V power supply
OK
Check main board power supply
OK
Check U302
OK
Check I2C communication
OK
Check panel
NG
NG
NG
Replace U302
Check power board power
Replace panel
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