AOC L19W631 User manual

19’’LCDTV AOCL19W631
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Service
Service
Service
Horizontal Frequency
31.5-80kHz
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
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…….…………………….……….....11
2.4. Front Panel Control Knobs……………….……….....13
3. Input/Output Specification…………....................…....14
4. Mechanical Instructions…………………….................17
5. Repair Flow Chart ……………………….…….…….....20
6. PCB Layout ………………..………………....….......25
6.1.Main Board…………..………….……….......25
6.2.Power Board……………..………….……….......28
6.3.Tuner Board……………………..………..............31
6.4. IR Board………………………………..……….......31
7. White-Balance, Luminance Adjustment...................32
8. Block Diagram.……...........................................34
9. Schematic……………...…………..………………...35
9.1 Main Board…….…………..……………….….......35
9.2.Power Board…………….……….………….......47
9.3.Tuner Board……………………..………..............49
9.4.Key Board……………………..………..............53
10. Exploded View..……………............................…..54
11. BOM List……………….………………………….….55
12.Different Parts List…………………………….……73

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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 TPV Model
A00 Sep.-02-2007 Initial Release E197MNNS2WAENN
A01 Oct.-04-2007 Add new model E197MNNK2WA5NN
A02 Feb.-29-2008 Add new model E197MNNK2WA52N

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1. General Specification
Items Specification
Panel Type 19” M190A1-L02 C1 panel
Driving system TFT-LCD CMO Panel
Aspect Ratio 16:10
Resolutions 1440 x900
Brightness 300 cd/㎡
Contrast 850:1
Pixel Pitch 0.285mm x0.285mm
Display colors 16.2 million
LCD Panel
Color Temperature Cool / Warm/normal
TV Standard NTSC-M , PAL-M, PAL-N
Sound System STEREO
TV Function
Closed Caption / V-chip For USA
AV RCA x 1 Audio L/R x 1
S-Video S-Video x 1 Audio L/R x 1
Video Inputs
COMPONENT Y,Cb,Cr x 1 Audio channel L / Rx 1
Speaker (built-in): Two 5W speakers
Audio Output Audio Output: L / R Headphone Mini-jack for stereo (3.5ø)
OSD language English, etc
Wall Mount VESA 100 mm x 100 mm
Power Supply AC100V~240V, 50/60Hz
Power Consumption ≤65W
Power
Standby <1W
Operating + 0 °C ~ + 40 °C
Storage - 25 °C ~ + 60 °C
Environment
Operating 10% ~ 85%
Dimension W x H x D (with stand) 477.9 x 405.9x 204.4 (mm)
Net weight Without accessory 6.2 Kg
Accessory Remote controller, Battery, Power cord, Signal Cable,
Audio Cable, User manual

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2. Operating Instructions
2.1 The Use of Remote Control
POWER
Press to turn on/off the TV. The
TV is never completely
powered off unless it is
physically unplugged.
0~9/100 Digit buttons
To select a TV channel. You
can directly input number key
in sequence to select any
channel.
CH
Press or to browse
through the TV channels,
which are not Skip. To view a
blocked channel, use the digital
buttons to access，the channel
and enter your access code.
VOL
Press or to adjust the
volume.
PC
Press for PC mode
SLEEP
With this key you can set a
time period after which the
TV should switch itself to
standby. Press the key
repeatedly to select the
number of minutes. The
counter runs from
5,10,15,30,45,60,90,120 ,
180,240 minutes or off.
PIP
Not Supported.
POP
Not Supported.
MUTE
Temporarily interrupt the
sound or restore it.
DISPLAY
Press this button to display
source information on the
left-top corner. TV mode, will
show Channel number
MTS /SAP
Press to activate
Multichannel Television
Sound, Stereo or Mono
sound.
PRE-CH
Press to display the
previously selected TV
channel.
TV/VIDEO
Select your input source:
press repeatedly to select TV,
AV, S-VIDEO, Component
or PC.
CAPTION
Press to turn or off Closed
Captioning.
Up & Down
Press these keys to move
up, down in the on-screen
menus. When the
on-screen menu is closed,
press it to change program
number
Left & Right
Press Left and Right, we can
Change the Setting of
submenu. When the
on-screen menu is closed,
press it to adjust volume.
SWAP
Not supported
V-CHIP
Turn on or off Child lock
function.
Format
Switch between Normal,
Wide or Cinema.

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MAIN MEN
U
2.2 To Use the Menus
1. Press the MENU button to display or close main menu.
2. Use the up/down to select a menu item.
3. Use the cursor left/right to enter a submenu or enable/disable the function.
4. Press the MENU button to exit the menu.
Press the MENU button to enter the main OSD (On Screen Display). Adjust the items including Audio setup, Video
setup, V-Chip setup, Function setup and TV setup. When the input source is VGA or Component mode, only the
Audio setup, Video setup and Function setup can be selected;
When the input source is TV mode, the Audio Setup, Video Setup, V-chip Setup, Function Setup and TV Setup can
be selected.
Audio Setup (Same as in VGA, TV, AV, S-Video and Components mode)
1. The range of Volume, Bass and Treble is 0~100.
2. The range of Balance is -50~+50. Adjusted from 0 to -50, the sound from the right track fades until silent.
Adjusted from 0 to +50, the sound from the left track fades until silent.
3. Preset: Select audio preset mode according to your preference. You can select Personal, Voice, Music and
Theatre mode.
4. Equalizer: You can select and adjust 100, 300, 1K, 3K and 8K respectively (the figures represent the sound
frequency range).

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5. Reset to default: Reset the audio setting to the factory default value.
Video setup
When the input source is in VGA mode, you can select Brightness, Contrast, Position, Video noise, Sharpness,
Auto adjust, Information, Color Temp. and Reset to default .
1. Brightness and Contrast: The range can be adjusted from 0~100.
2. Position: There are two options, Horizontal and Vertical, could adjust from -50 to +50 to adjust picture position on
screen.
3. Video noise: There are two options, Phase and Clock, could adjust from -50 to +50.
4. Sharpness: Select from five options of Normal, Softest, Soft, Sharp and Sharpest.
5. Auto adjust: Automatically adjust PC input to the optimal screen size.
6. Information: Prompt the current size for PC input definition
7. Color Temp.: There are five options of color temperature provided for users –SRGB, Normal, Cool, Warm and
User. You can select the four-color temperatures of SRGB, Normal, Cool and warm or manually adjust red, green
or blue in the user setting (you can only adjust red, green and blue in the user color).
8. Reset to default: Reset the video setting to the factory default value. When the input source is in
TV/AV/S-Video/Component mode, you can select Brightness, Contrast ,Color, Sharpness, Tint, Dyn. skin tone,
Color Temp. , Preset, Size and Reset to default.

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1. Brightness and Contrast: The range can be adjusted from 0~100.
2. Color: Could adjust from 0 to 100 to adjust the color saturation of picture.
3. Sharpness: Select from five options of Normal, Softest, Soft, Sharp and Sharpest.
4. Tint: Could adjust from 0 to 100 to adjust the color of picture.
5. Dyn. Skin tone: When the Dynamic skin tone is ON, the skin tone of person in the picture will be more vivid.
6. Color Temp.: There are three options of color temperature provided for users –Normal, Cool and Warm.
7. Preset: Select video preset mode according to your preference. You can select Personal, Movie, Sport Weak
signal and Game.
8. Size: There are five options –Normal, Wide 1, Wide 2, Zoom and Cinema.
9. Reset to default: Reset the video setting to the factory default value.
Function Setup
When the input source is in all mode, you can select Set time, Language , Sleep time and Reset to default ,But CC
and CC Preset just only for AV/S-Video/TV mode
1. Set time: You can set clock with up/down key. After pulling out power cord, clock will be call back to 12:00 AM.
You should set again when you plug power cord.
2. Language: Three languages provided - English, Portuguese and Spanish.
3. Sleep timer: Set the sleeping timer and the alert function, which will indicate the time left. You can set as
5,10,15,30,45,60,90,120,180,240 Min or off
4. CC: Set Close caption function on or off
5. CC Preset: Set Close caption channel. You can select CC1~CC4,TT1~TT4.
6. Reset to default: Reset the function setting to the factory default value.

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V-Chip Setup
The following menu appears only in AV, S-Video and TV mode.
1. Child Lock: You can set child lock function on or disable it.
2. Age: It could set to be Child, Youth, Youth Adult, Adult, Custom and off. Each Age setting changes the rating
settings accordingly. When Age is set to Custom, you can set the below rating respectively.
3. MPAA Rating: Select the movie ratings from low to high - G, PG, PG-13, R, NC-17, X and off.
4. PG Rating: To set the TV rating from low to high: TV-Y, TV-Y7, TV-G, TV-PG, TV-14 and TV-MA.
5. Can. English: To set the rating from low to high: E, C, C8+, G, PG,14+ and 18+.
6. Can. French: To set the rating from low to high: E, G, 8+, 13+, 16+ and 18+.
7. Set password: You can set new password with this item. Select Set password, then press right key, will show
below window:
Press the number buttons to enter the old password. If you have not set a password, enter 0000. If you forget the
password you set, please input 3448, then set new password again.After input old password, there will show below
window:
Input new password you want set, then there will show confirm window as below:

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Press the number buttons to enter the new password again, to confirm.
TV Setup
The following menu appears only in the TV mode.
1. Program no.: Shows the current channel number. You can change program no with left/right key of remote
control.
2. Tuning mode: Select the mode of TV signal –Cable
3. TV System: There are four options as NTSC-M, Auto, PAL-M and PAL-N. Recommend set it to auto.
4. Auto search: Select "Auto Search" to search all signaled channel; when the search 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, press the Menu button.
5. Fine Tuning: Fine Tune frequency of current program.
6. AFC: AFC can be set to ON or OFF. When it is set to ON, the TV will search the TV signal automatically. When
there is any offset in the signal, it will automatically adjust the channel to the correct position.
7. Skip: can be set to ON or OFF. When it is set to ON, the channel without signal can be skipped by pressing the
up/down button on the remote control or on the front panel.
8. Reset to default: Reset the TV setting to the factory default value.

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2.3 How to Connect
Remove the back plate at the back of the TV as shown on the illustration opposite. Lay the LCD TV with the screen
down on a table, as it will be easier to connect your peripheral equipment. Please take precaution not to damage the
screen.
1. AC power input terminal
2. VGA audio input
3. VGA signal input
4. AV signal input
5. Right audio track input (AV/S-Video)
6. Component left audio track input
7. Component right audio track input
8. TV input
9. Headphone outlet
10~12. Component signal input(Y, Pb, Pr)
13. Left audio track input (AV/S-Video)
14. S-Video signal input
Video recorder
How to connect
1. Connect the supplied antenna cable to the RF IN port of your VCR.
2. Connect another FR cable from the port of your VCR to the antenna port of you TV set. If you have connected the
video/audio cable to the video AV port, you may have better sound and picture when playing the VCR .
If your VCR has an S-VHS video jack:
For improved picture quality, connect a S-Video cable with the S-VIDEO input on the TV.
S-Video does not provide audio, audio cables must still be connected to provide sound (AV and S terminal share
one audio input).
Watching VCR
1. If you use connection TV, select the TV channel auto search.
2. If you use connection AV, select video AV input.
3. Insert videotape in the VCR and press the PLAY button.

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DVD Player
How to connect
1. Connect 3 separate components signal cables to the Y, Pb and Pr ports of the component signal of the DVD
player, and the Y, Pb and Pr ports of the component signal of theTV set.
2. Connect the audio cable to the audio output port of the DVD player and the audio input port of the component
signal of the TV set.
How to use
1. Select Component mode.
2. Turn on the DVD set.
Camera camcorder video game set….
How to connect
1. Connect the camera, camcorder and game set to the ports of the audio/video set.
2. The camcorder may get better picture by connecting a S-Video cable between the equipment and the TV set.
How to use it
1. Select the video AV or S-Video input.
2. Enable the exterior AV equipment.
Digital set top box
Connect the top box to the input port of the component signal.
How to connect
1. Connect 3 separate component signal cables to the Y, Pb and Pr ports of the component signal of the Digital TV/
Top Box, and the Y, Pb and Pr ports of the component signal of theTV set.
2. Connect the audio cable with the audio port of the Digital TV/Top Box and the audio port of the TV set.
How to use
1. Select Component.
2. Turn on the DVD set-Top box set.
Headphone
1. The headphone jack is located at the rear corner of the TV.
2. The MUTE key on the remote control works on both internal speaker and the headphone.
3. Use volume key to adjust the volume.

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2.4 Front Panel Control Knobs
VOL : Press to confirm your function selection (when the OSD main menu displayed) or adjust volume (without
OSD main menu)
CH : Select the intended function by pressing the two keys (when the OSD main menu displayed), or switch
the channels in the TV mode (without OSD main menu)
MENU : Press to show the OSD menu and exit OSD menu at the TV mode
INPUT: Press to select your input source.
POWER:Press to turn on or off the TV.

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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 RF HDTV Signal input
TUNER SIGNAL
Channel Coverage NTSC ，PAL M/N
Tuner ChangHong
TAF5-U2F41RW
VHF Low band IC1(55.25MHz) ～S6(127.25MHz)CH
VHF High band S7(133.25MHz) ～S36(361.25MHz)CH
UHF band S37(367.25MHz)～C57(801.25MHz)CH
Picture carrier Sound carrier
IF Frequency 42.17 MHz 41.25 MHz
Stereo/Bilingual BTSC / SAP
Impedance : 75 ohm terminated
LEVEL : 70dBuV

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3.3 AV/S-Video/Component Video Inputs
Video system PAL M/PAL N/ NTSC-M
Amplitude 1.0Vpp (including sync)
AV
(Composite Video)
Impedance 75 ohm terminated
Video system PAL M/PAL N/ NTSC-M
Y signal amplitude 1.0Vpp (including sync)
C signal amplitude 0.286Vpp
S-Video
Impedance 75 ohm terminated
Video System
DTV 480i, 480p, 576i,576p,720p, 1080i
Y signal amplitude 1.0Vpp (including sync)
Pr/ Pb signal amplitude 0.7Vpp
Component Video
Impedance 75 ohm terminated

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3.4 Compatible Mode Table
Sync
polarity Horizontal (dot) Vertical (line)
Item Video Mode fH
(kHz)
fV
(Hz)
Dot
clock
(MHz
) HV
H-tot
al
H-wi
de
H
Back
porch
H
Front
porch
V-to
tal
V-wid
e
H
Back
porch
H
Front
porch
Ana
log
1 31.46
9
59.94
0
25.17
5 N N 800 96 48 16 526 2 33 11 Y
2 37.86
1
72.80
9
31.50
0 N N 832 40 128 24 520 3 28 9 Y
3
VGA 640x480
37.50
0
75.00
0
31.50
0 N N 840 64 120 16 500 3 16 1 Y
4 35.15
6
56.25
0
36.00
0 P P 1024 72 128 24 625 2 22 1 Y
5 37.87
9
60.31
7
40.00
0 P P 1056 128 88 40 628 4 23 1 Y
6 48.07
7
72.18
8
50.00
0 P P 1040 120 64 56 666 6 23 37 Y
7
SVGA 800x600
46.87
5
75.00
0
49.50
0 P P 1056 80 160 16 625 3 21 1 Y
8 48.36
3
60.00
4
65.00
0 N N 1344 136 160 24 806 6 29 3 Y
9 56.47
6
70.06
9
75.00
0 N N 1328 136 144 24 806 6 29 3 Y
10
XGA 1024x768
60.02
3
75.02
9
78.75
0 P P 1312 96 176 16 800 3 28 1 Y
11 1152x864 67.50
0
75.00
0
108.0
00 P P 1600 128 256 64 900 3 32 1 Y
12 63.98
1
60.02
0
108.0
00 P P 1688 112 248 48 106 6 3 38 1 Y
13
VESA
SXG
A 1280x102
4 79.97
6
75.02
5
135.0
00 P P 1688 144 248 16 106
6 3 38 1 Y
14 VGA
TEXT 720x400 31.46
9
70.08
7
28.32
2 N P 900 108 45 27 449 2 35 12 Y
15 640x480
35.00
0
66.66
7
30.24
0 N N 864 64 96 64 525 3 39 3 Y
16 832x624
49.72
5
74.50
0
57.28
3 N N 1152 64 224 32 667 3 39 1 Y
17
Macin
tosh
1024x768 60.15
0
74.72
0
80.00
0 N N 1330 96 168 42 805 3 31 3 Y
18 1280x768
47.77
6
59.87
0
79.50
0 N P 1664 128 192 64 798 7 20 3 Y
19 1280x960
60.00
0
60.00
0
108.0
00 P P 1800 112 312 96 100
0 3 36 1 Y
20 1440x900
55.93
5
59.88
7 106.5 N P 1904 152 232 80 934 6 25 3 Y

19’’LCDTV AOCL19W631
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4. Mechanical Instructions
1. Remove the 4 screws to remove the base.
2. Remove the 6 screws to remove the rear cover.
3. Remove the AC cover.

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4. Remove the shield.
5. Remove the main board, power board.

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6. Remove the key board & IR board & speaker.
7. Relax the clips to remove the bezel.

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5. Repair Flow Chart
1. No Power (No LED indicator)
2. Can not start (LED indicator green)
Check the 12V Supply
OK
Repair the power
NG
OK
Check Q801，Q802，Q803，Q806,Q805
NG
Replace Q801 or Q802 or Q803 or Q806, Q806
OK
OK
Check LVDS cable
NG
Replug or replace the cable
OK
Check PT801,PT802, Q804,Q807
Check Panel
Check IC801 Replace IC801
NG
NG
Replace PT801,PT802,Q804,Q807
NG
Replace panel
Check the source
OK
Reset source
NG
NG
Check
p
ower cord and board interface Plu
g
in
p
ower cord and interface
OK
Check F901, BD901, C905 NG Re
p
lace F901 or BD901 or C905
OK
Check the start volta
g
e of IC901
p
in8
Check D902, C906, ZD905
NG Re
p
lace IC901, R931, R904, R938
OK
Check T901
OK
Re
p
lace T901
Re
p
lace D902 or C906 or ZD905
OK
NG
NG
Check the out
p
ut wave of IC901 PIN5 NG Re
p
lace D901 or Q903 or ZD904
OK
Check the feedback circuit&
p
rotect circuit