AOC L16W831 User manual

15.6″LCDTV AOC L16W831
1
Service
Service
Service
Horizontal Frequency
43~58kHz
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
6.1.Main Board…………..……………...……….......24
6.2.Power Board……………..………….……….......27
6.3.Key Board………………………..……….......28
6.4.IR Board…………………………..……….......28
7. White-Balance, Luminance Adjustment...................29
8. Block Diagram.……...........................................30
9. Schematic Diagram…….…………..………………...31
9.1 Main Board…………………………………...….......31
9.2.Power Board…………….…………...………….......42
9.3.Key Board……………….……….………….......44
10. Exploded View………………………………….…...45
11. BOM List……………….…………………………….46
Table Of Contents.......……..............................…........1
Important Safety Notice.......................................……......2
Revision List…………………………………………………3
1. General Specification..............................………........4
2. Operating Instructions…………………….……….......5
2.1. The Use Of Remote Control…….………….…….......5
2.2. To Use The Menu…...…………………….……….......6
2.3. How To Connect…….…………………….……….....10
2.4. Front Panel Control Knobs……………….……….....12
3. Input/Output Specification…………....................…....13
4. Mechanical Instructions…………………….................15
5. Repair Flow Chart ……………………….…….…….....19
6. PCB Layout ………………..………………....….......24

15.6″LCDTV AOC L16W831
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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.)

15.6″LCDTV AOC L16W831
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Revision List
Version Release Date Revision Instructions TPV Model
A00 Aug-28-2008 Initial Release E15RMANSW7AENN

15.6″LCDTV AOC L16W831
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1. General Specification
Items Specification
Panel Type M156B1-L01 TW
Driving system TFT-LCD CMO Panel
Aspect Ratio 16: 9
Resolutions 1366 (H) X768 (V) pixels
Brightness 250nits
Contrast 500:1
Pixel Pitch 0.252 (H)mm x 0.252 (V)mm
Display colors 16.7M
LCD Panel
Color Temperature Cool / Warm/normal
TV Standard NTSC-M/PAL-M/PAL-N
TV Function
Color systems NTSC-M/PAL-M/PAL-N
AV RCA x 1 Audio L/R x 1
S-Video S-Video x 1 Audio L/R x 1
COMPONENT Y,Cb,Cr x 1 Audio channel L / Rx 1
Video Inputs
HDMI 720p,1080i,480p,480i
Speaker (built-in): Two 1.4W speakers
Audio Output Audio Output: L / R Headphone Mini-jack for stereo (3.5ø)
OSD language English, etc
Wall Mount VESA 75 mm x 75 mm
Power Supply AC100V~240V, 50/60Hz
< 60W
Power Power Consumption <1W (in standby mode)
Operating 0 °C ~ 40 °C
Storage ﹣10 °C ~ 50 °C
Environment
Operating 10% ~ 85%

15.6″LCDTV AOC L16W831
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2. Operating Instructions
2.1 The Use of Remote Control
POWER
Press to power ON/OFF
(standby) TV. (Note: TV is
never completely power off
unless physically unplugged.)
VIDEO
Press to display source menu,
then move focus by or ,∧∨
and select by ENTER.
COMP
Press to choose Component
source mode directly.
PC/HDMI
Press repeatedly to toggle
between PC and HDMI source
modes
TV
Press to select TV source
mode.
0 ~ 9 number
Press to enter channel
numbers
SLEEP
Press to set sleep timer, setting
a mount of time before your TV
turn off automatically.(you can
set as 5min /10min /15min
/30min/ 45min/ 60min/ 90min/
120min/ 180min /240min or
Off)
VOL- / VOL+
Press + or - to adjust the
volume
MENU
Press to open or exit menu.
“”,“∧”,“∨＜”,“＞”,
“ENTER”
Press to adjust the various
function items on the menu.
DISPLAY
Press to show the information
about the input source or TV
channel.
MUTE
Press to mute the sound.
Press again to restore sound.
PREV CH
Press to display the previous
channel.
MTS/SAP
Press to activate the TV sounds,
such as: Stereo, SAP or Mono
tone.
WIDE
Press to choose the display aspect
as: Normal, Zoom and Wide mode.
SOURCE
Press to display source
information.
CH-/ CH +
Press to change TV channel up or
down
EXIT
Press to exit menu or OSD.
VIDEO ADJ
Press to switch the preset of video
preset mode.
AUDIO ADJ
Press to switch the preset of audio
preset mode.
CC
Press repeatedly to select closed
caption channel or set it off. You
can set as CC1, CC2, CC3, CC4,
TT1 / TT2, TT3, TT4 and off
FREEZE
No support for this product
FAV
No support for this product
EPG
No support for this product
V-CHIP
No support for this product

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MAIN MEN
U
2.2 To Use the Menus
1. Press the MENU button to display the main menu
2. Use the cursor left/right to select a menu item.
3. Use the cursor Up/Down to enter a submenu.
4. Press the enter button to enable/disable the function.
5. Press the MENU or EXIT button to exit the menu.
Press the MENU button to enter the main OSD (On Screen Display). Adjust the items including Picture menu,
Sound menu, advanced menu, Installation menu, PC setup menu and System menu.
When the input source is TV mode, Picture menu, Sound menu,advanced menu, Installation menu and
System menu can be selected.
When the input source is AV, S-video, Component or HDMI mode, only the Picture menu, Sound menu, Advanced
menu and System menu can be selected.
When the input source is PC mode, Picture menu, Sound menu, PC setup menu and System menu can be
selected.

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Picture Menu
1. Preset: Designed for different types of video mode. Can select Personal, Vivid, Standard and Mild
2. Brightness: Video brightness adjustment, can adjust only when Preset is setted as Personal. The tuning range
is 0 ~ 100.
3. Contrast: Video contrast adjustment, can adjust only when Preset is setted as Personal. The tuning range is 0
~ 100.
4. Color: Video color chroma adjustment, can adjust only when Preset is setted as Personal. The tuning range is
0 ~ 100.
5. Tint: Video tint adjustment, Can only select with NTSC signal. The tuning range is -50 ~ +50.
6. Sharpness: Video sharpness adjustment, the tuning range is 0 ~ 100.
7. Color temp: There are three options of colour temperature provided for users - warm, normal and cool.
8. Reset: Restore the default video settings.
Sound Menu
The Sound menu shows as below. It provides audio adjustment for user to modify the audio setting.
1. Preset: Designed for different types of sound mode. Can select Personal, Voice, Music and Theatre.
2. Bass: Bass tone adjustment, can adjust only when Preset is setted as Personal. The tuning range is -50 ~50.
3. Treble: Treble tone adjustment, can adjust only when Preset is setted as Personal. The tuning range is -50~50.
4. Balance: Audio balance adjustment, the tuning range is -50~50.
5. Reset: Restore the default audio settings.

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Advanced Menu
1. Noise reduction：Designed for different noise reduces effect, user can select off, Low, Normal and High.
2. Super contrast: Enhance the contrast of color. Default setting is On.
3. Size: There are various functions provided for zoom in or zoom out. Can select Normal, Zoom, and Wide.
4. Reset: Restore the default video settings.
se
1. Auto adjust: Automatically adjust PC input to the optimal screen size.
2. H.Position: Adjust Horizontal position of picture from -50~50.
3. V.Position: Adjust Vertical position of picture from -50~50.
4. Clock: Adjust clock of signal. The tuning range is -50~50.
5. Phase: Adjust phase of signal. The tuning range is -50~50.
Installation Menu
PC Setup Menu

15.6″LCDTV AOC L16W831
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1. Program No.: Shows the current channel number.
2. Tuning mode: Select the mode of TV signal as Cable or Air.
3. System standard: Can set as NTSC-M, PAL-M or PAL-N. Advise please do not change this item after auto
search action.
4. Auto search: Select "Auto Search" to search all signaled channel; when the searching is complete, it stays at
the first channel with signal and all channels that have been located are stored. If you would like to stop "Auto
Search" during the process, simply by pressing the MENU or EXIT button.
5. Fine tuning: Fine tune the frequency of current channel.
6. AFC: AFC can be set to ON or OFF. Set to ON, the TV will search signal automatically; when there is any offset
in the signal, will automatically adjust the channel to the correct frequency.
7. Skip: Skip can be set to ON or OFF. When it is set to ON, a channel can be skipped by pressing the switching
button on the remote control or on the front panel.
System Menu (
1. Menu language: There are four language options provided - English, French, Spanish and Portuguese.
2. Menu timeout: Adjust the time of menu display.
3. Sleep timer: Function with which you can set a time period after which the TV should turn itself off. You can set
it as 5, 10, and 15.30,45,60,90,120,180,240 and off.
4. Menu background: Adjust the background of OSD menu. The tuning range is 0 ~ 100.
5. Closed caption: Select CC channel as CC1~CC4, TT1~TT4 or Off.
6. Reset: Restore the default System settings.
7. Reset all: Reset all OSD setting to default value.

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2.3 How to Connect
Connecting your TV to a power outlet
• Plug the power cord into a power outlet.
Connecting an outside antenna
Antenna cables come in two types: 75 ohm and 300 ohm.
• If your antenna cable has a 75 ohm connector, connect the cable to the coaxial jack on the back of your TV.
• If your antenna cable has a 300 ohm connector, connect the cable to a 300-75 ohm adapter (not included), connect
the adapter to a 75 ohm cable, then connect the other end of the 75 ohm connector to the coaxial jack on the back of
your TV.
To connect cable TV without a converter/descrambler box:
1 Connect one end of a 75 ohm cable to the coaxial jack on the back of your TV.
2 Connect the other end of the cable to the cable TV wall outlet.
To connect cable TV with a converter/descrambler box:
• Use the following illustration to connect a converter/descrambler box. (The RF switch and the signal splitter are not
provided.) Set the RF switch to the A position to watch unscrambled channels using your TV remote control. Set the
RF switch to the B position to watch scrambled channels using the converter/descrambler controls.
To connect an external signal source:
1 For composite video—plug the audio/video cable into the AV IN L and R jacks (6), and AV IN VIDEO (4) jacks
on the back of your TV, then connect the other ends to the corresponding jacks on the external signal source- OR
–For S-Video—Plug in the audio cables as described above, then plug one end of an S-Video cable into the AV IN
S-Video(5) jack on the back of your TV and the other end into the S-Video jack on external signal source.
- OR - For component video—Plug the Y, Pb, and Pr video (3)cables into the component input jacks, and the
Audio L and Audio R cables into the COMPONENT (2) audio jacks on the back of your TV, then plug the other ends
of the cables into the corresponding jacks on the external signal source.
- OR - For HDMI—plug one end of an HDMI (1) cable into the back of the TV and the other end into an HDMI device.
2 Turn on your TV.
3 Press the INPUT to open the input source menu, press v or ^ to select the external signal source you want to
watch, and then press ENTER.
4 Turn on external signal source.

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5 Insert a disc or videotape into the external signal source, and then press the PLAY button.
To connect a computer using VGA:
1 Plug a VGA cable from your computer into the VGA jack on the back of your TV.
2 Plug an audio cable from your computer’s audio out jack into the AUDIO jack on the back of your TV.
3 Plug in and turn on your TV.
4 Press the INPUT to open the input source menu, press v or ^ to select VGA, and then press ENTER.
To connect a computer using HDMI:
• Plug an HDMI cable into the HDMI INPUT jack on the back of your TV and into the HDMI Out jack on the back of
the computer.

15.6″LCDTV AOC L16W831
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2.4 Front Panel Control Knobs
1 VOL▲VOL +: Press to increase the volume. In Menu mode, functions as right arrow to go
to a next menu or increase a setting.
2 VOL▼VOL - : Press to decrease the sound volume level. In Menu mode, functions as left
arrow to go to a previous menu or decrease a setting.
3 CH ▲CH +: Press to select the next higher Program number.
4 CH ▼CH - : Press to select the next lower Program number.
5 MENU Menu key: Press to open or exit the OSD menu.
6 INPUT Source key: Press to select the input source.
7 Power key: Press to turn on / off (standby) the TV set.

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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 RXD
4 TXD 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
1
6
11 15
5
10

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3.3 AV/S-Video/Component Video Inputs
3.4 Compatible Mode Table
VESA MODES
Horizontal Vertical
Mode Resolution Total
Nominal
Frequency
(KHz)
Sync
Polarity
Nominal
Freq.
(Hz)
Sync
Polarit
y
Nominal
Pixel
Clock
(MHz)
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
VGA
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
SVGA
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
XGA
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
WXGA 1360x768@60Hz 1792X795 47,712 P 60.015 P 85.5
1360x768@60Hz 1496x816 48.96 P 60.00 N 73.25
AV (Composite Video input)
Video1
System NTSC/PAL
Amplitude 1.0 V (p-p), negative sync.
Impedance 75 ohm terminated
S-Video (Y / C input)
S-Video2
System NTSC/PAL/SECAM
Y signal amplitude 1.0Vpp (including sync)
C signal amplitude 0.286Vpp
Impedance 75 ohm terminated
Component (Y, Pb/Cb, Pr/Cr input)
Video3
System 1080i, 480p, 720p, 480i
Y signal amplitude 1.0Vpp (including sync)
Cr, (R-Y) / Cb, (B-Y)
Signal amplitude ±0.35Vpp, 75 ohm
Impedance 75 ohm terminated

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4. Mechanical Instructions
1. Remove the 3 screws to remove the stand base.
2. Remove 7 screws to remove the rear cover.

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3.Releasetheconnectors.
4. Remove the screws to remove key board
5. Remove the speakers

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6. Remove Power board and Main board.
7.Remove the IR board

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8. Remove the 4 screws to remove the main frame.
9. The panel.

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5. Repair Flow Chart
1. No Power (No LED indicator)
2. Can not start (LED indicator yellow)
NG
Check power cord and board interface Plug in power cord and interface
OK
Check F901, BD901, C905 NG Replace F901 or BD901 or C905
OK
Check IC901, Q901
Check D904, D906
NG Replace IC901 or Q901
OK
Check T901
OK
Replace T901
Replace D904 or D906
OK
NG
NG
Check ZD920 NG Replace ZD920
NG Re
p
air ke
y
board or remote control
OK
Check U701
,
U702
,
U703 NG Re
p
lace U701
,
U702
,
U703
Check U400 NG Re
p
lace U400
OK
OK
Check ke
y
board or remote control
Check I
2
C communication
Can not start
OK

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3. No display (LED indicator green)
Check 12V
power supply
Check Panel NG Replace Panel
Check back light is OK
OK
Check LVDS cable
and connector
OK
Check UH200 NG Replace
U
H2
00
OK
Check U202 NG Replace U202
NG NG
OK
Check BL-ON/OFF signal
Check PS
signal
OK
OK Check power
board
NG
NG
NG
Check Q705、Q706 Replace Q705、Q706