Topview A2281Wd+ Service Manual
22” LCD Color Monitor Topview A2281Wd+
Service
Service
Service
Horizontal Frequency
31kHz – 80kHz
TABLE OF CONTENTS
Description Page Description Page
Table Of Contents.......……..……..........................…........1
Revision List.….............……...............................……......2
Important Safety Notice.………….......................……......3
1. Monitor Specification.................................………........4
2. LCD Monitor Description…………………………….......5
3. Operation Instructions………….............…….…...........6
3.1 General Instructions…………………………………….6
3.2 Control Buttons…………….…..............……...............6
3.3 Adjusting the Picture...........................……….............7
4. Input/Output Specification............……….……...........10
N
4.1 Input Signal Connector............…………...................10
4.2 Factory Preset Display Modes..................................11
4.3 Panel Specification.....………………........................12
5. Block Diagram……...................…………...................17
5.1 Software Flow Chart….………..…………....….......17
5.2 Electrical Block Diagram….…...………..….....…...19
6. Schematic…………..............................................…21
6.1 Main Board.……...……..........................................21
6.2 Power Board..………..……....................................25
6.3 Key Board..…………….…….................................27
7. PCB Layout..…………….........................................28
7.1 Main Board……………..........................................28
7.2 Power Board…..……….........................................30
7.3 Key Board…..……….............................................33
8. Maintainability………...............................................34
8.1 Equipments and Tools Requirement……..............34
8.2 Trouble Shooting..…….………..............................35
9. Monitor Exploded View……….……………..............41
10. BOM List……….....................................................42
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
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22” LCD Color Monitor Topview A2281Wd+
Revision List
Revision Date Revision History TPV Model
A00 Apr.-3-09 Initial Release TCRSMANAWLTVHN
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22” LCD Color Monitor Topview A2281Wd+
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 may 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 radiation 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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22” LCD Color Monitor Topview A2281Wd+
1. Monitor Specifications
Driving system 22” W TFT Color LCD
LCD Panel
Input
Display Colors 16.7M Colors
Dot Clock 146MHz
Max. Resolution 1680 x 1050 @60Hz
Plug & Play
EPA ENERGY STAR®
Size 55.8cm(22")
Pixel pitch 0.282mm( H )x 0.282mm( V )
R,G,B Analog Interface
Video
Digital
H-Frequency 31KHz – 80KHz
V-Frequency 56-75Hz
VESA DDC1/2B
ON Mode ≤ 49W
OFF Mode ≤ 1W
TM
D-Sub 15pin
Input Connector
DVI-D 24pin
Analog: 0.7Vp-p(standard), 75 OHM, Positive
Input Video Signal
Digital signal
Horizontal: 473mm
Maximum Screen Size
Vertical: 296mm
Power Source 100~240V, 50/60Hz, 1.5A
Operating Temp: 0° to 50°C
Environmental Considerations
Weight (N. W.) 4.7kg Unit (net)
Power Consumption ( Maximum ) 49 Watts
Storage Temp.: -20° to 60°C
Operating Humidity: 20% to 90%
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22” LCD Color Monitor Topview A2281Wd+
2. LCD Monitor Description
The LCD monitor will contain a main board, a power board and a key board which house the flat panel control logic,
brightness control logic and DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips
each voltage.
Monitor Block Diagram
CCFL Drive.
Flat Panel and
CCFL Backlight
Power Board
AC-IN
100V-240V
Main Board
Key Board
HOST Computer
RS232 Connector
For white balance
adjustment in factory
mode
Video Signal, DDC
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22” LCD Color Monitor Topview A2281Wd+
3. Operating Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the
monitor. By changing these settings, the picture can be adjusted to your personal preferences.
• The power cord should be connected.
• Connect the video cable from the monitor to the video card.
• Press the power button to turn on the monitor, the power indicator will light up.
3.2 Control Buttons
External Control Button
1. SOURCE
2. Auto Adjust button / Exit
3. -/ECO Mode
4. +/ Aspect control
5. MENU /ENTER
6. Power button
Front Panel Control
• /Power Button:
Press this button to turn the monitor ON or OFF, and display the monitor’s state.
• Power Indicator:
Blue — Power On mode
Orange — Off mode
• MENU / ENTER:
Activate OSD menu when OSD is OFF or activate/de-activate adjustment function when OSD is ON.
• SOURCE:
Select the VGA or DVI function.
• -/Eco mode:
Press the Eco key continuously to select the Eco mode of brightness when there is no OSD.
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22” LCD Color Monitor Topview A2281Wd+
• +/Aspect control:
The shortcut for switching between Full and 4:3; used as a function key when the OSD directory is in the start
status.
• Auto Adjust button / Exit:
1. When OSD menu is in active status, this button will act as EXIT-KEY (EXIT OSD menu).
2. When OSD menu is in off status, press this button for 2 seconds to activate the Auto Adjustment function.
The Auto Adjustment function is used to set the HPos, VPos, Clock and Focus.
OSD Lock Function: To lock the OSD, press and hold the MENU button while the monitor is off and then press
power button to turn the monitor on. To un-lock the OSD - press and hold the MENU button while the monitor is off
and then press power button to turn the monitor on.
3.3 Adjusting the Picture
Adjustment steps:
• Press the MENU-button to activate the OSD window.
• Press < or > to navigate through the functions. Once the desired function is highlighted, press the MENU-button
to activate it. If the function selected has a sub-menu, press < or > again to navigate through the sub-menu functions.
Once the desired function is highlighted, press MENU-button to activate it.
• Press < or > to change the settings of the selected function.
• To exit and save, select the exit function. If you want to adjust any other function, repeat steps 2-3.
The OSD Message
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22” LCD Color Monitor Topview A2281Wd+
Main Menu
Item
Luminance
Main
Menu
Icon
Sub Menu Item
Brightness Backlight Adjustment
Contrast Contrast from Digital-register.
Eco
Gamma
DCR
Sub Menu
Icon
Standard Standard Mode
Text Text Mode
Internet Internet Mode
Game Game Mode
Movie Movie Mode
Sports Sports Mode
Gamma1 Adjust to Gamma1
Gamma2 Adjust to Gamma 2
Gamma3 Adjust to Gamma 3
Off Disable dynamic contrast ratio
On Enable dynamic contrast ratio
Description
Image Setup
Color Temp.
Clock
Focus Adjust Picture Phase to reduce Vertical-Line noise
H. Position Adjust the horizontal position of the picture.
V. Position Adjust the vertical position of the picture.
Warm Recall Warm Color Temperature from EEPROM.
Normal Recall Normal Color Temperature from EEPROM.
Cool Recall Cool Color Temperature from EEPROM.
sRGB Recall SRGB Color Temperature from EEPROM.
User-B Blue Gain from Digital-register
User-G Green Gain from Digital-register.
User-R Red Gain from Digital-register
User
User-Y Yellow Gain from Digital-register
User-C Cyan Gain from Digital-register
User-M Magenta Gain from Digital-register
Full Enhance on or off Disable or Enable Full Enhance Mode
Adjust picture Clock to reduce Horizontal-Line
noise.
Color Boost
Nature Skin on or off Disable or Enable Nature Skin Mode
Green Field on or off Disable or Enable Green Field Mode
Sky-blue on or off Disable or Enable Sky-blue Mode
AutoDetect on or off Disable or Enable AutoDetect Mode
Demo on or off Disable or Enable Demo
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22” LCD Color Monitor Topview A2281Wd+
Main Menu
Item
Picture Boost
OSD Setup
Main
Menu
Icon
Sub Menu Item
Frame Size Adjust Frame Size
Brightness Adjust Frame Brightness
Contrast Adjust Frame Contrast
Hue Adjust Frame Hue
Saturation Adjust Frame Saturation
Position Adjust Frame Position
Bright Frame on or off Disable or Enable Bright Frame
H. Position Adjust the horizontal position of OSD
V. Position Adjust the vertical position of OSD
Timeout Adjust the OSD Timeout
Language Select the OSD language
Input Select
Sub Menu
Description
Icon
Digital Select Digital Signal Source as Input
Analog Select Analog Signal Source as Input
Auto Config Auto adjust the picture to default
Select full format for display
Extra
Aspect Control
Reset Reset the menu to default
DDC/CI Turn ON/OFF DDC/CI Support
Information
Select 4:3 format for display
Show the information of the main image and
sub-image source
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22” LCD Color Monitor Topview A2281Wd+
4. Input/Output Specification
4.1 Input Signal Connector
Pin No. Description Pin No. Description
1. Red Video 9. +5V
2. Green Video 10. Logic Ground
3. Blue Video 11. Monitor Ground
4. Monitor Ground 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
15 - Pin D-Sub connector
15
6
11 15
10
Pin No. Description Pin No. Description
1. TMDS Data2- 13. TMDS Data3+
2. TMDS Data2+ 14. +5V Power
3. TMDS Data 2/4 Shield 15. GND(return for +5V H. sync, V. sync)
4. TMDS Data4- 16. Hot Plug Detect
5. TMDS Data4+ 17. TMDS Data0-
6. DDC Clock 18. TMDS Data0+
7. DDC Data 19. TMDS Data 0/5 Shield
8. Analogue Vertical Sync 20. TMDS Data5-
9. TMDS Data1- 21. TMDS Data5+
10. TMDS Data1+ 22. TMDS Clock Shield
11. TMDS Data 1/3 Shield 23. TMDS Clock+
12. TMDS Data3- 24. DDC TMDS Clock-
24 - Pin DVI-D connector
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22” LCD Color Monitor Topview A2281Wd+
4.2 Factory Preset Display Modes
Standard
VGA
SVGA
XGA
SXGA
Resolution
640x480 31.469kHz 60 Hz
640x480 37.861kHz 72 Hz
640x480 37.500kHz 75 Hz
800x600 35.156kHz 56 Hz
800x600 37.879kHz 60 Hz
800x600 48.077kHz 72 Hz
800x600 46.875kHz 75 Hz
1024x768 48.363kHz 60 Hz
1024x768 56.476kHz 70 Hz
1024x768 57.515kHz 72 Hz
1024x768 60.023kHz 75 Hz
1280x1024 63.981kHz 60 Hz
1280x1024 79.976kHz 75 Hz
1280x960 60.000kHz 60 Hz
Horizontal
Frequency(KHz)
Vertical
Frequency(Hz)
WXGA
WSXGA
1440x900 55.935kHz 60 Hz
1440x900 70.635KHz 75Hz
1680x1050 65.290kHz 60Hz
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22” LCD Color Monitor Topview A2281Wd+
4.3 Panel Specification
LTM220M1-L01 is a color active matrix liquid crystal display (LCD) that uses amorphous silicon TFT (Thin Film
Transistor) as switching components. This model is composed of a TFT LCD panel, a driver circuit and a back light
unit. The resolution of a 22” is 1680 x 1050 and this model can display up to 16.7 millions colors.
4.3.1 General Specifications
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22” LCD Color Monitor Topview A2281Wd+
4.3.2 Optical Characteristics
Optical Specifications
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22” LCD Color Monitor Topview A2281Wd+
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22” LCD Color Monitor Topview A2281Wd+
4.3.3 Electrical Characteristics
TFT LCD Module:
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22” LCD Color Monitor Topview A2281Wd+
Back Light Unit:
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22” LCD Color Monitor Topview A2281Wd+
5. Block Diagram
5.1 Software Flow Chart
1
Y
2
N
4
N
5
Y
3
N
10
12
14
6
N
7
Y
9
N
Y
Y
11
13
15
8
N
Y
N
16
18
Y
17
N
19
Y
17
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