AOC LE32W157, LE40H157 Schematic
31.5″&40″LCD TV AOC LE32W157&LE40H157
1
Service
Service
Service
Horizontal Frequency
31~60KHz (D-SUB)
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
6.3 Key Board………………………..……..……….......34
6.4 IR Board………………………….……..………........35
7.Adjustment……..………………………….................36
8.Block Diagram.……...............................................37
9.Schematic Diagram…..…………....………………...39
9.1 Main Board…………………………………...…......39
9.2 Power Board…………..….….……...………….......54
9.3 Key Board……………….……….…………….........65
9.4 IR Board……...………….……….……………........66
10.Exploded View………………………………….…...67
11.BOM List……………….………………….………….71
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 ……………………….…….……...19
6.PCB Layout ………………..…………………....…....25
6.1 Main Board…………..……………...…….…….......25
6.2 Power Board………………..…….…….……….......28
2
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.)
3
Revision List
Version Release Date Revision Instructions Customer Model TPV Model
A00 Mar.12,2010 Initial Release
LE32W157
E32BATNSAFB16N
E32BATNSAFB66N
LE40H157
E40BXTNSAFB16N
E40BXTNSAFB66N
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1. General Specification
Note: For this content, pls refer to the user manual.
5
2. Operating Instructions
Note: For this content, pls refer to the user manual.
6
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
7
3.3 Compatible Mode Table
LE32W157
Analog RGB:
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@60 Hz 1344x806 48.363 N 60.004 N 65.000
1024x768@70 Hz 1328x806 56.476 N 70.069 N 75.000
1024x768@75 Hz 1312x800 60.023 P 75.029 P 78.750
WXGA 1360x768@60 Hz 1792X795 47.712 P 60.015 P 85.5
HDMI
Nominal Nominal Nominal
Mode Resolution Total
Horizontal
Frequency(KHz)
Vertical Frequency
(Hz)
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
Component
Industry
Code
Input signal
Format
Display performance description
Interlace
rate
Partition
Total
Line Per
Frame
Horizontal
Frequency
(KHz)
Vertical
Frequency
(Hz)
Sampling
Frequency
(MHz)
Aspect
720P
1280×720P*
1:1 750 45 60 74.25 16:9
1080i
1920×1080i*
2:1 1125 33.75 60 74.25 16:9
480i 720x480i 2:1 525 15.75 60 13.51
480P 720x483P 1:1 525 31.47 60 27.00
8
LE40H157
Analog RGB:
VESA MODES
Horizontal Vertical
Mode Resolution
Nominal
Frequency
(KHz)
Sync
Polarity
Nominal
Freq. (Hz)
Sync
Polarity
Nominal
Pixel Clock
(MHz)
VGA
640x480@60Hz 31.469 N 59.940 N 25.175
640x480@72Hz 37.861 N 72.809 N 31.500
640x480@75Hz 37.5 N 75 N 31.500
720x400@70Hz 31.469 N 70.087 P 28.322
SVGA
800x600@56Hz 35.156 P 56.25 P 36.000
800x600@60Hz 37.879 P 60.317 P 40.000
800x600@72Hz 48.077 P 72.188 P 50.000
800x600@75Hz 46.875 P 75 P 49.5
XGA
1024x768@60Hz 48.363 N 60.004 N 65.000
1024x768@70Hz 56.476 N 70.069 N 75.000
1024x768@75Hz 60.023 P 75.029 P 78.750
WXGA
1280x720@60Hz 45 P 60 P 74.25
1280x768@60Hz 47.396 P 59.995 N 68.25
1280x1024@60Hz 63.981 P 60.02 P 108.000
WSXGA
1440x900@60Hz 55.935 N 59.887 P 106.5
1680x1050@60Hz 64.674 P 59.883 N 119
FHD 1920x1080@60Hz 66.587 P 59.934 N 138.500
HDMI
VESA MODES
Horizontal Vertical
Mode Resolution Total
Nominal
Frequency
(KHz)
Sync
Polarity
Nominal
Freq. (Hz)
Sync
Polarity
Nominal
Pixel Clock
(MHz)
1080P 1920X1080P 2200 x 1125 67.5 60 148.50
1080P 1920X1080P 2200 x 1125 24 59.4
720P 1280×720P 1650 x 750 45.00 60 74.25
1080i 1920X1080i 2200 x 1125 33.75 60 74.25
480P 720X480P 858 x 525 31.50 60 27.03
480i 720X480i 1716 x 525 15.75 60 27.03
Component
Industry
Code
Input signal
Format
Display performance description
Interlace
rate
Partition
Total Line Per
Frame
Horizontal
Frequency
(KHz)
Vertical
Frequency
(Hz)
Sampling
Frequency
(MHz)
Aspect
720P
1280× 720P*
1:1 750 45 60 74.25 16:9
1080i
1920× 1080i*
2:1 1125 33.75 60 74.25 16:9
480i 720x480i 2:1 525 15.75 60 13.51 4:3
480P 720x483 P 1:1 525 31.47 60 27.00 4:3
1080p 1920 x1080p 1:1 1125 67.5 60 148.50 16:9
9
4. Mechanical Instructions
LE32W157
1. Unscrew the 5 screws to remove the COVER HINGE and STAND BASE ASS’Y.
2. Unscrew the 12 screws to remove the REAR COVER.
10
3. Disconnect all the WIRE HARNESS and TAPE_INSULATING.
4. Remove the BRACKET HINGE, AC COVER and SPEAKERS.
Note:
1. Speakers’ setting must follow the rule of Left: Red and Right: White.
2. Speakers’ PIN must face inside.
11
5. Remove the MAIN, POWER BOARD and BRACKET AC-IN, BRACKET BKT_SIDE, BRACKET BKT_IO_BTM.
12
6. Remove the BRACKET PANEL-HOLDER and INSULATING SHEET.
7. The PANEL.
INSULATING SHEET
13
8. The BEZEL.
14
LE40H157
1. Unscrew the 5 screws to remove the COVER HINGE and STAND BASE ASS’Y.
2. Unscrew the 15 screws to remove the REAR COVER.
15
3. Disconnect all the WIRE HARNESS and TAPE_INSULATING.
4. Unscrew to 4 screws to remove the BRACKET PANEL.
Note: The 2 wire harnesses must be in the groove.
16
5. Remove the MAIN, POWER BOARD and BRACKET IO-SIDE, BRACKET IO-DOWN.
6. Remove the BRACKET MAIN PCB-LEFT and SPEAKERS.
Note:
1. Speakers’ setting must follow the rule of Left: Red and Right: White.
2. Speakers’ PIN must face inside.
17
7. Unscrew the 11 screws to remove the BRACKET PANEL-HOLDER and INSULATING SHEET.
INSULATING SHEET
INSULATING SHEET must
be stuck on the part where no
conductive fabric
18
8. The PANEL and BEZEL, separate the PANEL from BEZEL.
9. The BEZEL.
19
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
20
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
21
3. No display
Check the B/L
signal is available?
Replace main board
Replace the power board
Panel Vcc = 12V?
Replace the Panel
No display (LED blue)
Replace the main board
Check the backlight is
“On”?
Check the LVDS cable
Reinsert or replace the
LVDS cable
Replace the main board
Replace the Panel
No
Yes
Yes
No
Yes
No
No
Yes
Yes
No
Yes
No
Power board output＝24V?
Check TV is under control and power
on/off by remote control and power key?
22
4. Sound problem
No sound or sound abnormal
Check the TV is muted, adjust the
volume or enter the menu to reset?
Reinsert the audio cable or
change the TV system
Replace the cable
Replace the speaker
Replace the main board
No
Yes
No
Check the cable between the
speakers and main board is ok?
Check the speaker resistance value is in spec
(Remark: The value is marked on the speaker)?
Check the audio source connection
and the TV system are correct？
Yes
No
No
Yes
23
5. Remote control malfunction
Remote Control malfunction
Replace the battery
Replace the remote control
Whether the IR board is
abnormal?
Yes
No
Replace the IR board
Replace the main board
No
Yes
No
Yes
Use the other remote controls
Check the remote control battery is
not properly placed or no power?
24
6. OSD is unstable or can’t work normally
Key board connected properly?
Reconnect the key board
Buttons are ok?
Replace the button function
Yes
No
Key board is ok?
Replace the key board
Replace the main board
No
Yes
No
Yes
OSD is unstable or can’t work normally
25
6. PCB Layout
6.1 Main Board
715G4727M0D000005K
26
27
28
6.2 Power Board
LE32W157 715G4500P01W30003S
29
30
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