AOC L22W765 User manual

22’’LCDTV AOCL22W765
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Service
Service
Service
Horizontal Frequency
31.5-60kHz
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……………………………..……….......29
6.4. IR Board….. ………………..……………....….....29
7. White-Balance, Luminance Adjustment...................30
8. Block Diagram.……...........................................32
9. Schematic……………...…………..………………...33
9.1 Main Board…….…………..……………….….......33
9.2.Power Board…………….……….………….......46
9.3.Key Board……………….……….………….......48
10. Exploded View..……………............................…..49
11. BOM List……………….………………………….….50
12.Different Parts List…………………………………76
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…….…………………….……….....12
2.4. Front Panel Control Knobs……………….……….....13
3. Input/Output Specification…………....................…....14
4. Mechanical Instructions…………………….................16
5. Repair Flow Chart ……………………….…….…….....19
6. PCB Layout ………………..………………....….......24

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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
E227MZNK2WA5NN
A00 Sep.-21-2007 Initial Release
E227MZNS2WAENN

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1. General Specification
Items Specification
Panel Type 22” M220Z1-L03 C1 panel
Driving system TFT-LCD CMO Panel
Aspect Ratio 16:9
Resolutions 1680 x1050
Brightness 300 cd/㎡
Contrast 1000:1
Pixel Pitch 0.282mm x0.282mm
Display colors 16.7 million
LCD Panel
Color Temperature Cool / Warm/normal
TV Standard ATSC, NTSC,8-VSB,Clear-QAM
Color systems ATSC, NTSC
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
COMPONENT Y,Cb,Cr x 1 Audio channel L / Rx 1
Video Inputs
HDMI 720p,1080i,480p,480i
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 ≤75W
Power
Standby <1W
Operating + 0 °C ~ + 40 °C
Storage - 25 °C ~ + 60 °C
Environment
Operating 10% ~ 85%

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2. Operating Instructions
2.1 The Use of Remote Control
VIDEO
Press repeatedly to choose S-Video/
Composite source mode (Video 1 ~
2).
COMP
Press choose Component
source mode (Video 3).
PC
Press repeatedly to choose VGA
or HDMI source mode (Video 4 ~
5
).
TV
Press to choose ATSC/NTSC TV
source mode.
0 ~ 9 /- number
Press to enter TV channel
number to select channel
(Press ‘-’ to indicate choosing
the sub-channel
)
.
SLEEP
Press to set a time period (off/5
min/15min/30min/45min/60min/90
min/120min/180min/240min)after
which the TV should switch itself
to standby mode.
FREEZE
Press to freeze the displayed
p
icture
VOL- / VOL+
Press + or - to adjust the volume.
MENU
Press to open or exit menu.
POWER
Press to power ON/OFF (standby)
TV.(Note:1.TV is never completely
power off unless physically unplugged.
2.Press to turn on TV after the power
on status LED had changed to the
amber color and stopped flashing. )
INFO
Press to show the information about
the input source 、TV channel 、
display resolution and current time.
MUTE
Press to set TVsound mute
ON/OFF
PREV CH
Press to display the previous TV.
MTS/SAP
Press to activate the NTSC TV
sounds, such as: Stereo, SAP or
Mono tone.
WIDE
Press to choose the display aspect
as: Normal, Wide, Zoom or
Cinema mode.
CH-/ CH +
Press + or - to browse through the
TV channels.
Exit
Press to exit menu or OSD.
CC
Press repeatedly to change cc
on/cc off/cc on when mute
FAV
Press to display the favorite TV
channel.(After setting the favorite
TV channel on main menu.)
V-CHIP
Press to lock / unlock Parental
Control temporarily. (After setting
the restricted table of MPAA or TV
Rating.)
“”,“”,“∧∨＜”,“＞”,“OK
Press to adjust the various
function items on the menu.

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MAIN MENU
2.2 To Use the Menu
1. Press the MENU button to display the main menu
2. Use the cursor up/down to select a menu item.
3. Use the cursor left/right to enter a submenu.
4. Press the OK button to enable/disable the function.
5. Press the MENU or EXIT button to exit the menu.
The Setup menu in TV mode shows as below. In others source modes, the Setup menu only shows Menu
Language and Aspect Ratio items.
1. Tuning Band: Select TV source signal from the Air (antenna) or Cable (CATV).
2. DTV Signal: Show the intensity of the received DTV signal.
3. Auto Ch Search: Automatically scan all NTSC / ATSC TV channels and then store in the channel table. In
channel scan process, the OSD can display the number of channels which had been found.
4. Add on Ch search: Add channels which are new found.
5. Manual Channel Set: Show the channel setup table. User can choose to display the ATSC or NTSC TV channels
and then edit (add/delete) the channel numbers.
6. Channel Labels: Show the NTSC / ATSC TV channel label menu for user modifying channel labels specifically.
7. Menu Language: Select the menu display language. (English / Spanish / French)
8. Aspect Ratio: Select the display aspect ratio. (Normal/Zoom/Wide/Cinema)
9. Favorite Channel Mode: When favorite channel mode on user can edit favorite channel table in favorite channel
set option.
VIDEO MENU
The Video menu in most source modes shows as below. It provides several video adjustment items for user fine
tuning the video display. Only in VGA source modes, the Video menu simply provides Contrast,Brightness, Back
light and Settings (Preset) items.

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1. Contrast: Video contrast adjustment, the tuning range is 0 ~ 100.
2. Brightness: Video brightness adjustment, the tuning range is 0 ~ 100.
3. Sharpness: Video sharpness adjustment, the tuning range is -50 ~ 50.
4. Color: Video color chroma adjustment, the tuning range is 0 ~ 100.
5. Tint: Video tint adjustment, the tuning range is R50 ~ G50.
6. BackLight: Backlight strength adjustment, the tuning range is 0 ~ 10.
7. Settings: Restore the default video settings.
AUDIO MENU
The Audio menu in TV mode shows as below. It provides audio adjustment for user to modify the audio setting.
Except in ATSC TV mode, some audio adjustment items for user to modify the audio setting. Excepting in ATSC TV
mode, the Audio Language option is disable in others source modes. The audio language setting is only available in
ATSC TV source.
1. Audio Language: Change the audio language setting on ATSC TV programs the number of the supported
audio languages depends on the ATSC TV programs.
2. Bass: Bass tone adjustment, the tuning range is 0 ~ 63. (The default state is enabled)
3. Treble: Treble tone adjustment, the tuning range is 0 ~ 63. (The default state is enabled)
4. Balance: Audio balance adjustment, the tuning range is L31 ~ R31.)
5. Digital Audio Output: Digital audio output format selection, user can choose RAW (default) or PCM format or
off.
6. TV Speaker: Choose to turn on / off the TV internal speaker. The digital audio output signals、earphone output

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signals will not be turn-off even though the TV speaker is off. The default setting is on.
7. Settings: Restore the default audio settings.
FEATURE MENU
The Feature menu in TV mode shows as below. It provides certain optional control functions such as time set, sleep
timer, advanced video menu, Password Set, parental control (V-chip) and Digital closed caption setting. This menu
gives users the most flexibilities to satisfy their generally demands. According to the various requirements in different
source modes, certain features should be hidden (disable) on the menu. The details footnotes will be described
clearly below.
1. Time Set: Set current time. This sub-menu includes Time Set Mode ,Time Zone and Time items. 【Time Set
Mode】user can choose Auto or Manual,【Time Zone】item provides user to set current time zone, such as:
Pacific、Alaska、Hawaii、Eastern、Central and Mountain.
【 Time 】 item provides user to set the time clock.
2. Sleep Timer: Enable or disable the TV standby timer. User can set the TV standby timer
as off / 5 min / 10 min /
15 min/ 30 min / 45 min / 60 min/ 90 min / 120 min / 180min/ 240min. Timer starts to count down after cursor
leaving the sub-menu. (At the moment, the item shows 『** min Left』and the cursor highlights on the Feature
icon.)
3. Advanced Video Menu: Provide the Noise Reduction、Color Temperature and 3D Y/C. Dynamic Contrast options
for enhancing video quality.
【 Noise Reduction 】 gi ves four NR effect degrees, such as: Low、Mid、High and Off. The default setting is Mid.
【 Colour Temp 】 gives three color temperature modes as: Normal、Warm and Cool. The default mode is Warm.
【 3D Y/C 】 provides On / Off switches. The default setting is On.

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【 Dynamic Contrast 】 user can choose 0n or Off.
【 Setting 】 restores the default advanced video option settings.
4. Password Set: Change the 4-numeral parental control password. Three steps are required for changing the
password: Enter Old Password -> Enter New Password -> Confirm New Password. Note: This item is only
available in TV, Composite and S-Video source modes. The default password is 『0 0 0 0』.
5. Parental Control: provide the parental Control (V-chip) function setting.
Before entering the Parental Control
sub-menu, user has to key in the password first. Then enter the Parental Lock item, User can modify the
restricted table about MPAA or TV Rating respectively. While exiting the sub-menu, the parental control function
is working. The inhibitive channels or source signals can be un-lock through pressing the V-CHIP key on the
remote control and then key in the correct password. Note: This feature is only available in TV, Composite and
S-Video source modes. (The default password is: 0 0 0 0.)

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6. Digital Captions: Select the close caption options ( Service 1-6, Text 1-4 and CC 1-4) in digital TV mode. When
select service 1 to service 6 you can modulate parameters in the Digital Close Caption.
7. Digital Close Caption: Provide numerous options for setting the digital close caption style. In the sub-menu.
【Style】item can be set as Automatic or Custom mode. If Custom mode is selected, user can modify the detail
styles described below. The setting result will be shown immediately on the bottom side of the sub-menu OSD.
Note: This feature is only available in Digital TV(ATSC) mode.
【Size】: Digital close caption font size, which can be set as Small、Normal or Large.
【Font】: Digital close caption font style, which can be chosen as Default or Font 1 ~ 7.
【Tex t C o l o r 】: Giving Red / Green / Blue/ Yellow / Magenta / Cyan / Black / White Colors.
【Te x t O p a ci t y 】: Giving Transparent / Translucent / Solid / Flashing modes.
【Background Color】: Giving Red / Green / Blue / Yellow / Magenta / Cyan / Black / White Colors.
【Background Opacity】: Giving Transparent / Translucent / Solid / Flashing modes.
【Edge Effect】: The text edge effects, which gives None / Raised / Depressed / Uniform / Left Shadow / Right
Shadow modes.

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【Edge Color】: The colors of text edge effects, which provides Red / Green / Blue / Yellow / Magenta / Cyan /
Black/WhiteColors.
8. Component Set: This option only shows and is available in component mode, which provides fine tuning
component display, such as: 【H-Position】、【V-Position】,【Phase】.All these items are giving the tuning range
from 0 to 100.【Setting】item provides the default component setting values restoring.
9. VGA Set: This option only shows and is available in VGA mode, which provides several items for the VGA display
fine tuning, such as : 【H-Position】、【V-Position】、【Clock】and 【Phase】. All these items giving the tuning range
from 0 to 100.【Setting】item provides the default VGA setting values restoring.

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2.3 How to Connect

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2.4 Front Panel Control Knobs

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3. Input/Output Specification
3.1 RGB Signal input
1
6
11 15
5
10
15 - Pin Color Display Signal Cable
Pin No. Description Pin No. Description
1 Red Video 9 Mandatory +5V Supply for PC Bypass
2 Green Video 10 Sync Ground
3 Blue Video 11 SDA(Remote Control)
4 SCL(Remote Control) 12 Bi-directional Data (SDA) for PC Bypass
5 Ground 13 H-Sync.
6 Red Video Ground 14 V-Sync.
7 Green Video Ground 15 Data Clock (SCL) for PC Bypass
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

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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
1360x768@60Hz 1792x795 47.712 P 60.015 P 85.5
1440x900@60Hz 1600x926 55.469 P 59.901 N 88.75
WXGA
1440x900@60Hz 1904x934 55.935 N 59.887 P 106.5
AV (Composite Video input)
Video1
System NTSC
Amplitude 1.0 V (p-p), negative sync.
Impedance 75 ohm terminated
S-Video (Y / C input)
S-Video2
System NTSC
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 4 screws to remove the base.
2. Remove the 5 screws to remove the rear cover.
2. Remove the AC cover.

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3. Remove the shield.
4. 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 yellow)
NG Re
p
air the ke
y
board
OK
Check 12V SB NG Return to “1”
OK
Check PWR ON si
g
nal NG Check U905
,
Q906
,
0907 NG Re
p
lace U905 or Q906 or Q907
Check I
2
C communication
OK
Check RELAY-SW si
g
nal NG Re
p
lace Q910
,
Q912
Check U401 NG Re
p
lace U401
OK
OK
Check main board
p
ower su
pp
l
y
p
art
Check ke
y
board
OK
Check I
2
C communication
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 the start voltage of IC901
Check the output of IC901 pin6
NG Check R932, R904, R933, IC901
OK
Check the voltage of IC901 PIN1
OK
Check T901, D902, R909, C908, IC903
Check D901, Q901
OK
NG
NG
Check ZD920, IC902, IC903
NG Replace ZD903 or IC902 or IC903

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3. No display (LED indicator green)
Check the source
OK
Reset source
NG
Check LVDS cable NG Reset LVDS cable
OK
Check 12V power supply NG Return to “1”
OK
OK
Check U401 NG Replace U401
OK
Check panel NG Replace panel
Check the start voltage of IC801 NG Check Q802, Q804, Q803, IC801
OK
Check IC801 pin18 output is triangle wave NG Check R821, C821
OK
Check IC801 pin11, 12/pin19, 20 output is square wave
NG Check IC801
OK
Check PT801, PT802, Q801, Q805,
Q811, Q812
NG
Replace PT801, PT802, Q801, Q805, Q811,
Q812