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Asus VW221D User manual

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22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
1
Service
Service
Service
Horizontal Frequency
30-82 KHz
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.
Table Of Contents…………………………………………...1
Revision List……………………………………………….2
Important Safety Notice………………………………….…3
1. Monitor Specification..............................………........4
2. LCD Monitor Description…………………………….......5
3. Operation Instruction…................................................6
3.1. General Instructions...........................…...........6
3.2. Control Button………………………………..............6
3.3. OSD Menu….............................................................9
4. Input/Output Specification............……………............12
4.1. Input Signal Connector............………….................12
4.2. Power Supply Requirements...............................12
4.3. Factory Preset Display Modes…….........................12
4.4. Panel Specification…………………………………...14
5. Block Diagram…........................................................16
5.1. Software Flow Chart…………………….……….......16
5.2. Electrical Block Diagram….............................18
6. Schematic…………….......................................20
6.1. Main Board………..........................................20
6.2. Power Board...……....................................24
6.3 Key Board………………………………………26
6.4 Audio Board ………………………….…………27
7. PCB Layout..…………......................................28
7.1. Main Board………........................................28
7.2. Power Board…...............................................31
7.3. Key Board……………....................................34
7.4 Audio Board …………………………………….34
8. Maintainability……….......................................35
8.1. Equipments and Tools Requirement..............35
8.2. Trouble Shooting………….............................36
9. White-Balance, Luminance adjustment............42
10. Monitor Exploded View………….…...........44
11. BOM List………………………………............45
12. Different Parts List…………………………...…74
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
2
Revision List
Version Release Date Revision History Customer Model TPV Model Name
TC8CMGNBWYUENN
VW221D TC8CMGNBWYUSNN
TC8CMGNTWYUSA
A00 Apr 15, 2008 Initial release
VW221S TC8CMGNKWYUSAN
TC8CMGNBWYUSNC
TC8CMGNKWYUSNC
VW221D
TC8CMGNBWYUENC
A01 Sep 29,2008 Add new BOM
VW221S TC8CMGNTWYUSAP
A02 Nov 20, 2008 Add new BOM VW221DE TC8CMGNYWYUSNC
22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
3
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 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.)
22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
4
1. Monitor Specifications
22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
5
2. LCD Monitor Description
VW221D
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.
VW221S
The LCD monitor will contain a main board, a power board, an audio 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
Power Board
AC INPUT
LVDS wire
+
5
V
D-SUB
Key Board
B/L control
Audio
Board
Audio
C
ontrol
Audio in
+12V
S
peakers
LCD PANEL
Scalar Board
+5V
AC INPUT
LVDS
+
5
V
D-SUB
Key Board
B/L control
LCD PANEL
Scalar Board
Powe Board +5V
22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
6
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 the front of the
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
VW221D
22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
7
22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
8
VW221S
22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
9
3.3 OSD Menu
22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
10