AOC LE32W157, LE40H157 Schematic
31.5″&40″LCD TV AOC LE32W157&LE40H157
Service
Service
Service
Horizontal Frequency
31~60KHz (D-SUB)
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 ……………………….…….……...19
6.PCB Layout ………………..…………………....…....25
6.1 Main Board…………..……………...…….…….......25
6.2 Power Board………………..…….…….……….......28
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
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
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
1
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.)
2
Revision List
Version Release Date Revision Instructions Customer Model TPV Model
E32BATNSAFB16N
LE32W157
E32BATNSAFB66N
A00 Mar.12,2010 Initial Release
E40BXTNSAFB16N
LE40H157
E40BXTNSAFB66N
3
1. General Specification
Note: For this content, pls refer to the user manual.
4
2. Operating Instructions
Note: For this content, pls refer to the user manual.
5
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
6
3.3 Compatible Mode Table
LE32W157
Analog RGB:
VESA MODES
HDMI
Mode Resolution Total
VGA
SVGA
XGA
WXGA 1360x768@60 Hz 1792X795 47.712 P 60.015 P 85.5
Nominal Nominal Nominal
Horizontal Vertical
Nominal
Frequency
(KHz)
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
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@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
Sync
Polarity
Nominal
Freq. (Hz)
Sync
Polarity
Nominal
Pixel Clock
(MHz)
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)
Vertical Frequency
(Hz)
Component
Display performance description
Industry
Code
720P
1080i
480i 720x480i 2:1 525 15.75 60 13.51
Input signal
Format
1280×720P*
1920×1080i*
Interlace
rate
Partition
1:1 750 45 60 74.25 16:9
2:1 1125 33.75 60 74.25 16:9
Total
Line Per
Frame
Horizontal
Frequency
(KHz)
Vertical
Frequency
(Hz)
Sampling
Frequency
(MHz)
Pixel Clock
(MHz)
Aspect
480P 720x483P 1:1 525 31.47 60 27.00
7
LE40H157
Analog RGB:
Mode Resolution
VGA
SVGA
XGA
WXGA
WSXGA
FHD 1920x1080@60Hz 66.587 P 59.934 N 138.500
HDMI
VESA MODES
Horizontal Vertical
Nominal
Frequency
(KHz)
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
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
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
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
1440x900@60Hz 55.935 N 59.887 P 106.5
1680x1050@60Hz 64.674 P 59.883 N 119
VESA MODES
Sync
Polarity
Nominal
Freq. (Hz)
Sync
Polarity
Nominal
Pixel Clock
(MHz)
Mode Resolution Total
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
Horizontal Vertical
Nominal
Frequency
(KHz)
Sync
Polarity
Nominal
Freq. (Hz)
Sync
Polarity
Pixel Clock
Component
Display performance description
Industry
Code
720P
1080i
480i 720x480i 2:1 525 15.75 60 13.51 4:3
Input signal
Format
1280× 720P*
1920× 1080i*
Interlace
rate
Partition
1:1 750 45 60 74.25 16:9
2:1 1125 33.75 60 74.25 16:9
Total Line Per
Frame
Horizontal
Frequency
(KHz)
Vertical
Frequency
(Hz)
Sampling
Frequency
(MHz)
Nominal
(MHz)
Aspect
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
8
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.
9
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.
10
5. Remove the MAIN, POWER BOARD and BRACKET AC-IN, BRACKET BKT_SIDE, BRACKET BKT_IO_BTM.
11
6. Remove the BRACKET PANEL-HOLDER and INSULATING SHEET.
INSULATING SHEET
7. The PANEL.
12
8. The BEZEL.
13
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.
14
3. Disconnect all the WIRE HARNESS and TAPE_INSULATING.
Note: The 2 wire harnesses must be in the groove.
4. Unscrew to 4 screws to remove the BRACKET PANEL.
15
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.
16
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
17
8. The PANEL and BEZEL, separate the PANEL from BEZEL.
9. The BEZEL.
18
p
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
No
Replace the main board
No
Power “On”
No
Replace the power board
19
2. Can’t start
Can’t start（LED red）
Power board output＝24V?
Yes
Check the power key is under control?
No
Check the IR receiver is normal?
No
Replace the power board
Yes
Replace the key board
Yes
Replace the IR board
No
Replace the main board
No
Replace the Power board
20
3. 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
Yes
Check the backlight is
“On”?
No
Reinsert or replace the
LVDS cable
No
No
Check the B/L
signal is available?
Yes
Replace the main board
No
Replace main board
Panel Vcc = 12V?
Yes
Replace the Panel
No
Replace the main board
Power board output＝24V?
Yes
Replace the Panel
Replace the power board
No
21
4. 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?
No
Check the cable between the
speakers and main board is ok?
No
Reinsert the audio cable or
change the TV system
No
Yes
Check the speaker resistance value is in spec
(Remark: The value is marked on the speaker)?
Yes
Replace the speaker
Replace the main board
Replace the cable
No
22
5. Remote control malfunction
Remote Control malfunction
Check the remote control battery is
not properly placed or no power?
No
Use the other remote controls
No
Whether the IR board is
abnormal?
No
Replace the main board
Yes
Replace the battery
Yes
Replace the remote control
Yes
Replace the IR board
23
6. 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
Replace the main board
No
Reconnect the key board
No
Replace the button function
No
Replace the key board
24
6. PCB Layout
6.1 Main Board
715G4727M0D000005K
25
26 27
6.2 Power Board
LE32W157 715G4500P01W30003S
28
29 30
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