Asus VW221D User manual

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
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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
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1. Monitor Specifications

22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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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
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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
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22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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VW221S

22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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3.3 OSD Menu

22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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4. Input/Output Specification
4.1 Input Signal Connector
Analog connectors
Pin No. Description Pin No. Description
1. Red Video 9. +5V Supply
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
VGA connector layout
4.2 Power Supply Requirements
A/C Line voltage range 100 V ~ 240 V
A/C Line frequency range 50 ±3Hz, 60 ±3Hz
Input Voltage transients 90-264 voltage AC for 10 sec @40
Current 1.5A max at 100V; 0.8A max at 240 V
Peak surge current < 60A peak at 240 VAC and cold starting
< 30A peak at 120VAC and cold starting
Leakage current < 3.5mA
Power line surge No advance effects (no loss of information or defect)
with a maximum of 1 half-wave missing per second

22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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4.3 Factory Preset Display Modes

22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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4.4 Panel Specification
4.4.1 General Features
CLAA220WA01 is 21.6” color TFT-LCD (Thin Film Transistor Liquid Crystal Display) module composed of LCD
panel, driver ICs, control circuit and backlight. By applying 6 bit digital data, 1680×1050, 16.7M-color images are
displayed on the 21.6” diagonal screen. Input power voltage is 5.0V for LCD driving. Inverter for backlight is not
included in this module.
4.4.2 Display Characteristics

4.4.3 Optical Characteristics

22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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4.4.4 Electrical Characteristics
(1) TFT-LCD
(2) Backlight

22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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5. Block Diagram
5.1 Software Flow Chat
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
15
Y
N
16
17
19
Y
N
18

22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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1) MCU initializes.
2) Is the EPROM blank?
3) Program the EPROM by default values.
4) Get the PWM value of brightness from EPROM.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Save the power key status into EPROM.
Turn on the LED and set it to green color.
Scalar initializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are there any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message
disappears.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?

22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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5.2 Electrical Block Diagram
5.2.1 Main Board
EEPROM
M24C16-WMN6TP (U204)
Panel Interface
(CN301)
SCK
SCZ
Keypad Interface
(CN201)
D-Sub Connector
(CN101)
EEPROM
M24C02 (U101)
H sync
V sync
RGB
DDC1_SCL,
DDC1_SDA
Flash Memory
PM25LV010A-100SCE (U402)
Crystal
14.31818MHZ(X201)
Scalar TSUMU18BWL-LF
(Include MCU, ADC, OSD)
(U202)

22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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5.2.2 Inverter/Power Board
DIM
EMI filter
Start Circuit: R904, R932, R933
PWM Control IC
Transformer
AC input
12V
ON/OFF
Control
Feedback
Circuit
Transformer MOSFET
Lamp
ON/OFF
5V
Bridge
Rectifier
and Filter
Feedback
Circuit
Rectifier
diodes
CN902
Output
Circuit
PWM
Control IC
（IC801）
Over Voltage

22" LCD Color Monitor ASUS VW221D&VW221DE&VW221S
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6. Schematic
6.1 Main Board
715G2698-4
RX1P
C108
NC
R136 NC
DET_CABLE 2
R121
4K7 1/16W 5%
R127 NC
C111
NC
VGA_G+
C105
0.047uF
R126 NC
C119
NC
RX2N 2
R110
100R 1/16W 5%
R103 1K 1/16W 5%
D111
NC
3
1 2
RX2P
VGA_G-
DDC2_SDA 2
D107
NC
DSUB_G- 2
RXCN 2
R105
2K2 1/16W 5%
VGA_B+
R104
56 OHM 1/16W
R122 NC
C113
0.047uF
D118
NC
DDC_WP2
RX1N 2
DSUB_5V
RX0P
R137
NC
R101 0R05 1/10W 5%
VGA_G+
RX1N
D116
NC
3
1 2
DDC2_SCL
DGND
D109
NC
ZD103
RLZ5.6B
R129 NC
R113 100R 1/16W 5%
C102
22pF
DSUB_H 2
VGA_PLUG
R123 NC
R133 NC
R106
2K2 1/16W 5%
RX0N 2
DSUB_B+ 2
VGA_R-
R134
NC
C106
1000pF
C109
0.047uF
DSUB_R+ 2
DDC2_SDA
VCC3.3
DSUB_B- 2
DSUB_G+ 2
DSUB_V 2
D102
BAV99
3
1 2
R130 NC
R120
4K7 1/16W 5%
D112
NC
3
1 2
R114 100R 1/16W 5%
RX1P 2
C121
NC
R102 1K 1/16W 5%
RXCP
RX2N
TC7CMGFNW8U2NN/TC8CMGF8W8U2NN 3
ASUS VK221D/VW221D B
2 5Monday, July 07, 2008 715G2698-3
 < >
2.0.INPUT
G2698-4-X-X-24-080707
OEM MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME

T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬    
FB101
0 OHM
1 2
GND POWER
R108 100R 1/16W 5%
R131 NC
R119 NC
R115
56 OHM 1/16W
DDC1_SDA
D115
NC
3
1 2
RXCN
VGA_B+
DDC_WP2
VGA_R+
C120
NC
D114
NC
3
1 2
93G 64 42 P
RXCP 2
CMVCC
C101
0.047uF
D103
BAV99
3
1 2
DVI_HPD
U102
NC
1
2
3
45
6
7
8A0
A1
A2
VSSSDA
SCL
WP
VCC
R109 470R 1/16W 5%
D106
NC
R124
NC
CMVCC
DSUB_R- 2
R138 NC
R111
56 OHM 1/16W
D105
BAV70
3
1 2
R128 NC
R117 100R 1/16W 5%
DDC1_SCL2
C117
NC
D110
NC
3
1 2
VGA_B-
C107
0.047uF
R112
75R 1/16W 5%
DVI_5V
CMVCC
CN101
DB15
1
6
2
7
3
8
4
9
5
11
12
13
14
15 10
17 16
C124
NC
DVI_5V
DSUB_5V
VGA_G-
RX2P 2
DDC2_SCL
C118
0.1uF/16V
DSUB_5V
VGA_PLUG
CN103
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
26 25
DAT2-
DAT2+
2/4shield
DAT4-
DAT4+
DDC SCL
DDC SDA
VSYNC
DAT1-
DAT1+
1/3shield
DAT3-
DAT3+
+5V
SYNC GND
HPD
DAT0-
DAT0+
0/5shield
DAT5-
DAT5+
clk shield
clk+
clk-
GND GND
VGA_R+
C116
NC
C114
0.22uF16V
DSUB_SOG 2
C103
22pF
VGA_B-
HPD_CTRL 2
ZD101
RLZ5.6B
DDC1_SDA
VGA_R-
R118
10K 1/16W 5%
R135
NC
ZD106
RLZ5.6B
C104
NC
Q101
NC
D113
NC
3
1 2
C122
NC
D117
NC
3
1 2
DDC1_SCL
DDC1_SCL
R107
75R 1/16W 5%
C112
0.1uF/16V
FB102
0 OHM
1 2
R132
NC
RX0P 2
RX0N
VGA_R+
DDC2_SCL 2 U101
M24C02-WMN6TP
1
2
3
45
6
7
8A0
A1
A2
VSSSDA
SCL
WP
VCC
DDC2_SDA
CMVCC
VGA_B+
D108
NC
R125
NC
R139 NC
R116
75R 1/16W 5%
D101
NC
3
1 2
DVI_HPD
FB103
0 OHM
1 2
D104
BAV99
3
1 2
C125
NC
DDC1_SDA2 VGA_G+
HOT_PLUG
R140
NC
ZD102
RLZ5.6B
C115
NC
ZD105
RLZ5.6B
C123
NC
ZD104
RLZ5.6B
C110
0.047uF