AOC V22T User manual

21.5″&23.6″TVMonitor AOC V22t&V24t
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Service
Service
Service
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………………..……………...…..…......22
6.2 Power Board…..…………..………….…..…….......26
6.3 Key Board………………………..……..……….......34
6.4 IR Board…………………………..……….…….......34
7.Adjustment...............................................................35
8.Block Diagram.………..............................................36
9.Schematic Diagram………..……..………………......38
9.1 Main Board…………….…………………...….........38
9.2 Power Board………..…....…………...……….........46
9.3 Key Board……………….………….………….........49
9.4 IR Board…………..………………….………..........50
10.Exploded View…………………….………….….......51
11.BOM List……………….…………….…………….....55
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 Menus...……………………….……….......6
2.3 Front Panel Control Knobs……………….………......10
2.4 How to Connect……..…………………….………......11
3. Input/Output Specification…………....................…....13
4. Mechanical Instructions…………………….................15
5. Repair Flow Chart ……………………….…….…….....19
6. PCB Layout ………………..………………....…..........22

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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 openAVOID 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 Customer Model TPV Model
V2A9CKNL2XIGNZ
V2A9CKNC2XADNN
V22t
V2A9CKNL2XIGNZ
A00 Nov. 06, 2009 Initial Release
V24t V2C9MKNLY9IGNN

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1. General Specification
Model V22t V24t
Display area 546mm (21.5”) 598mm (23.6”)
Recommend frequency 1920 x1080 1920 x1080
Visual angle Horizontal:170°
Vertical:160°(Typ.)
Horizontal:170°
Vertical:160°(Typ.)
Brightness 250cd/m² 300cd/m²
Contrast 60000:1 60000:1
Sound output 2Wx2 2Wx2
Color systems PAL/NTSC PAL/NTSC
Sound Systems (D/K,B/G,I)/(D/K,B/G,I ,M) (D/K,B/G,I)/(D/K,B/G,I, M)
Antenna input impedance 7575
Power Voltage AC100-240V 50/60Hz AC100-240V 50/60Hz
Power Consumption 35W 60W
Power Consumption (Stand by) 1W 1W
Dimensions (W)x(H)x(D) (mm)
(with stand) 551.6x456x220.2 599.4x485.55x220.2
Table stand Not include. Not include.
Wall Mounting 100 x100mm M4x4 pcs (Screws) 100x100mm M4x4 pcs (Screws)
Environmental Considerations:
Operating Temperature
Operating Humanity
Storage Temperature
Storage Humanity
0~40℃℃
15% to 90%
-20 ~60℃℃
15% to 90%
0~40℃℃
15% to 90%
-20 ~60℃℃
15% to 90%

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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.)
TV
Press to choose TV source mode
directly.
VIDEO
Press repeatedly to toggle between AV
and S-VIDEO source modes
HDMI/PC
Press to toggle between HDMI and PC
source modes.
Component Signal
Press to choose Component source
mode directly.
0~9、1--
Press to enter channel numbers.
PRE CH
Press to display the previous channel
VOL
Press or to adjust∧∨ the volume.
SOURCE:
Press to choose the input source:
PC Signal input, HDMI input,
Video input, S-Video input.
NICAM
Press to activate the TV sounds,
CH
Press to change TV channel up or down
“∧”,“∨”,“＜”,“＞”, Press to adjust the
various function items on the menu.
OK
Press to display the submenu
MENU:
Press to open or exit MENU.
WIDE
Press to choose the display aspect.
DISPLAY
Press to show the information about the
input source or TV channel.
PICTURE
Press to switch the preset of video preset
mode:
SOUND
Press to switch the preset of audio preset
mode.
Sleep
Press to set sleep timer, setting 0~120
minutes before your TV turn off
automatically.Component input and TV input.

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2.2 To Use the Menus
1. Press the Menu button to display Main Menu.
2. Use the V- or V+ to select the function to be adjusted.
3. Use the P- or P+ to enter into the submenu, or to enable or adjust the selected function.
4. Press the Menu button to exit the Main Menu.
Source Menu
Press the Source button to enter the Source Menu: PC, HDMI, AV, S-Video, Component, TV.
Picture Setting
Brightness Adjustable between 0-100, set the backlight brightness of the picture.
Contrast Adjustable between 0-100, set the contrast of the picture.
Saturation Adjustable between 0-100, adjust the color concentration of the picture. (unavailable for PC and
Component Signal modes)
Sharpness Adjustable between 0-100, set the sharpness of thepicture.
Color Temp. Provides three options – Cold, Normal and Warm.
DNR (unavailable for PC mode)
Picture Mode Provides four options – Mild, Standard, Vivid and User.
DCR Turn on/off dynamic contrast mode
Reset Restore the picture settings to the default mode.

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Sound Setting (the same for all modes)
Sound Mode Switch between the five preset sound modes
Bass Adjust the intensity of the bass
Treble Adjust the intensity of the treble
Balance Adjustable between 0-60. While adjusting in the range of 30-0, the sound of the right channel fades out to
zero. While adjusting in the range of 30-60, the sound of the left channel fades out to zero.
Reset Restore the sound settings to the default setting.
Function Setting

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MENU language Select the OSD language between English/Simplified Chinese
/Russina/Portuguese/French/Spanish.
Image Ratio 4:3
16:9
Movie (unavailable for PC mode)
Panorama (unavailable for PC mode)
Sleep Timer Set the time for the TV set to enter the standby state (unavailable for PC mode)
OSD Position Change the display position of the OSD menu.There are a total of 9 positions.
OSD Transp. Adjustable between 0-10, set the transparency of the OSD menu.
Timeout Adjustable between 5-60, set the display time (in seconds) of the OSD menu.
Power Saver Turn on/off the power saving mode
Power On Recall Turn on/off the power on recall function
Reset Restore the function settings to the default mode.
Tuning (the following menus appear only in TV mode)
Channel Nr. Display the number of the current TV channel.
Frequency Display the frequency of the current TV channel.
Color System Display the color system of the current TV signal. (displayed as Auto after automatic saving)
Sound System Display the sound system of the current TV signal. (displayed as Auto after automatic saving)
Update Search
Auto Search It is used for the user to search the channel automatically and save the TV program. Pressing the
“Menu’ key will exit the Auto Search mode.
Manual Fine Tune Press and hold the Left or Right key for more than 3 seconds to enter the Manual Search mode;
in case of program with signal, exit the Semi-Auto Search and save the current program in the current program
number.
Channel Skip It can be set as On and Off. When it is set as On, press the Channel Skip on the remote controller
or on the panel.

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PC Setting (the following menus appear only in the PC mode)
Auto Config Automatically config the optimal position of the picture to the optimal time sequence position.
H. Position Adjust the horizontal position of the picture
V. Position Adjust the vertical position of the picture
Clock Eliminate the vertical interfering lines
Phase Eliminate the horizontal interfering lines
Reset Restore the function settings to the default mode.

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2.3 Front Panel Control Knobs
Input: Press this button to change input source.
Menu: Press this button to display or exit the OSD menu.
CH▲/▼: When the OSD menu appears, press these two buttons to select the item you want to execute; when no
OSD menu appears, use to change channels in TV mode.
Vol ▲/▼: When the OSD menu appears, press these two buttons to select or adjust the selected item; when no
OSD menu appears, use to adjust the volume.

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2.4 How to Connect
Several signal source devices can be connected to your TV set. The following diagram shows how to connect them.
Tips: If you want to hang the TV set on the wall, all connecting wires must be insertedinto the interfaces of the TV set
first.
Whenever a peripheral device is connected to the TV set, ensure that the TV set is turned off.
When connecting a peripheral device, connect the cable to the connecting terminal that is the same color as the
cable color.
Antenna Input:
Insert the antenna connector into the antenna jack of the TV. The interface is a 75 coaxial cable input.

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Video/S-terminal input：
Connect the video signal source or S-terminal cable to a device such as a DVD, laser disc player, video recorder or
camera.
Audio input: Connect the audio signal source (computer, DVD, laser disc player,video recorder or camera, etc.) to
the audio input port.
Tips: The S-terminal audio is shared with the video and audio terminals.
Component Input：
Connect the sound and picture of the component signal source (DVD, laser disc player, video recorder or camera,
etc.) to the component signal input port.
HDMI：
HDMI (High-Definition Multimedia Interface) can be used to connect the HDMI signal cable to the DVD player and
other devices.
Computer signal and computer audio input:
Connect the host signal to the computer input port at the back of the TV via the VGA signal cable.
Connect one end of the PC audio cable to the PC audio input port of the TV, and connect the other end to the audio
cable port of the PC host.
Headphone jack:
The user can use headphones by inserting the plug into the headphone jack.

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3. Input/Output Specification
3.1 Connectors
D-sub
Pin No. Description Pin No. Description
1 Red Video 9 ＋5V Power
2 Green Video 10 GND
3 Blue Video 11 N/A
4 N/A 12 DDC-Serial Data
5 DDC-Return 13 H-Sync.
6 Red Ground 14 V-Sync.
7 Green Ground 15 DDC-Serial Clock
8 Blue Ground
HDMI
Pin No. Description Pin No. Description
1 HDMI data 2＋11 HDMI Clock Shield
2 HDMI data 2 Shield 12 HDMI Clock－
3 HDMI data 2－13 CE remote
4 HDMI data 1＋14 N/A
5 HDMI data 1 Shield 15 DDC Clock
6 HDMI data 1－16 DDC Data
7 HDMI data 0＋17 GND
8 HDMI data 0 Shield 18 ＋5V Power
9 HDMI data 0－19 HP DET
10 HDMI Clock＋
Composite Vedio / S-Video AND Component Vedio Connectors
S-Video (Y/C) : Monitor rear side : 4 Pin Mini-DIN female
Composite Video : Monitor rear side : RCA female
Audio Output : Monitor rear side : RCA female (Red/White) (right channel/left channel)
Audio In : Monitor rear side : PhoneJack (Green)
Headphone : Monitor rear side : PhoneJack (Black)

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3.2 Factroy Preset Timing
VESA MODES
Horizontal Vertical
Mode Resolution Total
Nominal
Frequency
+/- 1kHz
Sync
Polarity
Nominal
Frequency
+/- 1 Hz
Sync
Polarity
Nominal
Clock
(MHz)
640x480@60Hz 800x525 31.469 N 59.940 N 25.175
640x480@72Hz 832x520 37.861 N 72.809 N 31.500
VGA
640x480@75Hz 840x500 37.500 N 75.00 N 31.500
800x600@56Hz 1024x625 35.156 N/P 56.250 N/P 36.000
800x600@60Hz 1056x628 37.879 P 60.317 P 40.000
800x600@72Hz 1040x666 48.077 P 72.188 P 50.000
SVGA
800x600@75Hz 1056x625 46.875 P 75.000 P 49.500
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
1280x1024@60Hz 1688x1066 63.981 P 60.020 P 108.000
SXGA
1280x1024@75Hz 1688x1066 79.976 P 75.025 P 135.000
1440x900@60Hz 1904x934 55.935 N 59.887 P 106.500
WXGA+
1440x900@60Hz 1600x926 55.469 P 59.901 N 88.750
1680x1050@60Hz 2240x1089 65.290 N 59.954 P 146.250
WSXGA
1680x1050@60Hz 1840x1080 64.674 P 59.883 N 119.000
HD 1920x1080@60Hz 2200x1125 67.500 N 60.000 N 148.500
1280x720@60Hz 1650x750 45.000 P 60.000 P 74.250
***
1280x960@60HZ 1800x1000 60.000 P 60.000 P 108.000
IBM MODES
DOS 640x350@70Hz 800 x 449 31.469 P 70.087 N 25.175
DOS 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322
MAC MODES
VGA 640x480@67Hz 864x525 35.000 N 66.667 N 30.240
SVGA 832x624@75Hz 1152x667 49.725 N 74.551 N 57.283
XGA 1024x768@75Hz 1328X804 60.241 N 74.927 N 80.000

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4. Mechanical Instructions
1. Removing the BASE
Insert the tip of a screwdriver into the bracket fixing hole and firmly press down and remove the base at the same
time as Fig 1.
Fig 1
2. Removing the I/O
Unscrew the 7 screws to remove I/O as Fig 2.
Fig 2

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3. Removing the REAR COVER.
Unscrew the 4 screws to remove REAR COVER as Fig 3.
Fig 3
4. Removing the AL TAPE.
Remove all the AL TAPE as Fig 4.
Fig 4

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5. Removing the HINGE, HINGE COVER and SHIELD.
Remove the HINGE AND HINGE COVER as Fig 5.
Fig 5
6. Removing the all the WIRE, MAIN BOARD COVER and INVERTER BOARD COVER.
Disconnect all the WIRE as Fig 6.
Fig 6

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5. Repair Flow Chart
1). No power
No power
Press power key and look
if the picture is normal
Please reinsert and make sure
the DC 19V is normal
Reinsert or check the
A
da
p
ter/Inverter section
X401 oscillate waveforms are normal
Check CN702, CN703, U704, U705
Replace U401
Replace X401
OK
OK
OK
NG
NG
NG
NG
Check U704 Vout=5V
U705 Vout=1.2V

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2). No picture
No picture
OK
OK
NG
NG
Check CN702, CN703, U704, U705
X401 oscillate waveforms are normal
Replace X401
Check if the Hsync signal from CN106 is normal
Input the sync signal of computer,
or change the cable
Re
p
lace U401
NG
OK
Check U704 Vout=5V
U705 Vout=1.2V