Asus VW224U - 22" LCD Monitor User manual

ServiceManual ASUS VW224U&VW224S
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LCD Monitor Service Manual
Model: ASUS VW224U&VW224S
D
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR
INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE, AND
SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO RESPONSIBILITY
OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS MANUAL,

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Index
Revision Lists………………………………….............................................................................. 3
Important Safety Notice…………………………………………………………………………………..4
1. Monitor Specification..............................……….........................................................................5
2. Operation Instruction…………………………………………………………………………………..6
2.1. General Instructions...........................…............................................................................ 6
2.2.Control Button…………….…..............……......................................................................... 6
2.3.OSD Menu…………….…...........................…......................................................................9
3. Input/Output Specification............……………..........................................................................12
3.1. Input Signal Connector............…………...........................................................................12
3.2. Power Supply Requirements............................................................................................ 12
3.3. Factory Preset Display Modes…….................................................................................. 14
4. Block Diagram…..….....................………….............................................................................15
5. Schematic Diagram……………………....…............................................................................ 20
5.1. Main Board……….............................................................................................................20
5.2. Power Board...…….......................................................................................................... 28
5.3. Audio Board...……....................................................................................................... ….30
5.4. Key Board…………….......................................................................................................31
6. PCB Layout...………................................................................................................................32
6.1. Main Board……….............................................................................................................32
6.2. Power Board…................................................................................................................. 35
6.3. Audio Board…...................................................................................................................38
6.4. Key Board……………................................... ...................................................................38
7. Disassemble & Assemble SOP.……………….. ............................................................... …..39
8. ISP Instruction………..............................................................................................................59
9. DDC Instruction…………………………........... .......................................................................62
10. Color/White Balance Adjustment……………........................................................................ 71
11. Trouble Shooting……………………….................................................................................. 73
12. Exploded View…..……………………..... ......................................................................... .....79
13. BOM List………………………………….............................................................................. 80
14. Different Parts List...............................................................................................................109

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Revision List
Version Release Date Revision History Customer Model Vendor Model Name
TCR2MPNCWYUSDI
A00 Aug 7.2008 Initial release
TCR2MPNTWYUSDI
TCR2MPNBWYUSDI
A01 Oct 30,2008 Add new BOM
VW224U
TCR2MPNKWYUSDI
A02 Jan 5,2009 Add new BOM VW224S TCR2MPNBWYUSAI

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Important Safety Notice
Safety information
• Before setting up the monitor, carefully read all the documentation that came with the package.
• To prevent fire or shock hazard, never expose the monitor to rain or moisture.
• Never try to open the monitor cabinet. The dangerous high voltages inside the monitor may result in serious
physical injury.
• If the power supply is broken, do not try to fix it by yourself. Contact a qualified service technician or your retailer.
• Before using the product, make sure all cables are correctly connected and the power cables are not damaged. If
you detect any damage, contact your dealer immediately.
• Slots and openings on the back or top of the cabinet are provided for ventilation. Do not block these slots. Never
place this product near or over a radiator or heat source unless proper ventilation is provided.
• The monitor should be operated only from the type of power source indicated on the label. If you are not sure of the
type of power supply to your home, consult your dealer or local power company.
• Use the appropriate power plug which complies with your local power standard.
• Do not overload power strips and extention cords. Overloading can result in fire or electric shock.
• Avoid dust, humidity, and temperature extremes. Do not place the monitor in any area where it may become wet.
Place the monitor on a stable surface.
• Unplug the unit during a lightning storm or if it will not be used for a long period of time. This will protect the monitor
from damage due to power surges.
• Never push objects or spill liquid of any kind into the slots on the monitor cabinet.
• To ensure satisfactory operation, use the monitor only with UL listed computers which have appropriate configured
receptacles marked between 100-240V AC.
• If you encounter technical problems with the monitor, contact a qualified service technician or your retailer.
WARNING
• Before you lift or reposition your monitor, it is better to disconnect the cables and power cord. Follow the correct
lifting techniques when positioning the monitor. When lifting or carrying the monitor, grasp the edges of the
monitor.Do not lift the display by the stand or the cord.
• Cleaning. Turn your monitor off and unplug the power cord. Clean the monitor surface with a lint-free, non-abrasive
cloth. Stubborn stains may be removed with a cloth dampened with mild cleaner.
• Avoid using a cleaner containing alcohol or acetone. Use a cleaner intended for use with the LCD. Never spray
cleaner directly on the screen, as it may drip inside the monitor and cause an electric shock.
WARNING: Information to prevent injury to yourself when trying to complete a task.
CAUTION: Information to prevent damage to the components when trying to complete a task.
IMPORTANT: Information that you MUST follow to complete a task.
NOTE: TIPS AND ADDITIONAL INFORMATION TO AID IN COMPLETING A TASK

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1. Monitor Specifications

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2. Operation Instruction
2.1 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.
2.2 Control Button
VW224U
1. button:
• Automatically adjust the image to its optimized position, clock, and phase by long pressing this button for -4
seconds (for VGA mode only).
• Use this hotkey to switch from five video preset modes (Game Mode, Night View Mode, Scenery Mode, Standard
Mode, Theater Mode) with SPLENDID™ Video Enhancement Technology.
• Exit the OSD menu or go back to the previous menu as the OSD menu is active.
2. Button:
• Press this button to increase the value of the function selected or move to the previous fuction.
• This is also a hotkey for Brightness adjustment.
3.MENU Button:

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• Press this button to enter/select the icon (function) highlighted while the OSD menu is activated.
4. Button:
• Press this button to increase the value of the function selected or move to the previous fuction.
• This is also a hotkey for Brightness adjustment.
5. Input Select Button
Use this hotkey to switch from VGA,DVI input signal.
66. Power button
• Press this button to turn the monitor on/off.
7. Power indicator
• The color definition of the power indicator is as the below table.
VW224S
1. button:
• Use this hotkey to switch from five video preset modes (Game Mode, Night View Mode, Scenery Mode, Standard
Mode, Theater Mode) with SPLENDID™ Video Enhancement Technology.
• Exit the OSD menu or go back to the previous menu as the OSD menu is active.
2. Button:
• Press this button to decrease the value of the function selected or move to the next fuction.
• This is also a hotkey for Volume adjustment.
3. MENU Button:
• Press this button to enter/select the icon (function) highlightedwhile the OSD menu is activated.

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4. Button:
• Press this button to increase the value of the function selected or move to the previous fuction.
• This is also a hotkey for Brightness adjustment.
5. button:
•Automatically adjust the image to its optimized position, clock, and phase by long pressing this button (for VGA
mode only).
6. Power button：
Press this button to turn the monitor on/off.
7. Power indicator：
• The color definition of the power indicator is as the below table.

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2.3 OSD Menu

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3. Input/Output Specification
3.1 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
DVI connectors (VW224S not available)
Pin No. Description Pin No. Description Pin No. Description
1. RX2- 9. R X1- 17. RX0-
2. RX2+ 10. RX1+ 18. RX0+
3. RX2 Shield 11. RX1 Shield 19. RX0 Shield
4. NC 12. NC 20. NC
5. NC 13. NC 21. NC
6. DDC Clock 14. +5V Power 22. RX Clock Shield
7. DDC Data 15. Ground 23. RX Clock+
8. NC 16. Hot Plug Detection 24. RX Clock-

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3.2 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

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3.3 Factory Preset Display Modes

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4. Block Diagram
4.1 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

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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?

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4.2 Electrical Block Diagram
4.2.1 Main Board
VW224U
Flash Memory
PM25LV010A
(U402)
Panel Interface
(CN407)
Crystal
14.31818MHZ
(X401)
Keypad Interface
(CN403) Scalar TSUMO5RCWHQ-LF
(Include MCU, ADC, OSD)
(U401)
EEPROM
M24C02
(U404)
H sync
V sync
RGB
SCL_VGA,
SDA_VGA
DVI Connector
(CN406)
EEPROM
M24C02
(U405)
D-Data
D-Clock
SCL_DVI
SDA_DVI
EEPROM
M24C16
(U403)
D-Sub Connector
(CN405)

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VW224S
Flash Memory
PM25LV010A
(U402)
Panel Interface
(CN407)
Crystal
14.31818MHZ
(X401)
Keypad Interface
(CN403) Scalar TSUMU5RBWHQ-LF
(Include MCU, ADC, OSD)
(U401)
EEPROM
M24C02
(U404)
H sync
V sync
RGB
SCL_VGA,
SDA_VGA
EEPROM
M24C16
(U403)
D-Sub Connector
(CN405)

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4.2.2 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

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W224U&VW224S
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5. Schematic
5.1 Main Board
VW224U 715G2670-1-2
+5V
C714
0.1uF/16V
VCC 3.3
+5V
+
C703
100uF/16V
Adj_BACKLIGHT 4
+5V 3,4, 5
GND
R712
4K7 1/16W 5%
+5V
R708
10K 1/16W 5%
AUD IO_MUTE 4
BL_ON
R711
10K 1/16W 5%
+5V
GND
C701
0.1uF/16V
C711
0.1uF/16V
VOLUME 4
Q703
MMBT3904
U702
AP1117E33LA
23
1
4
OUTIN
GND
4
+5V3,4,5
+
C712
100uF/16V
C704
0.1uF/16V
VCC 3.3
C709
0.1uF/16V
R701
NC
VCC 3.3 4
U701
3 2
1
VI VO
GND
TCR2MPNCWYUSDI 1
VW224 B
25Thursday , January 10, 2008
715G2670-1-2 <
称爹 >
2. POWER
G2670-1-2-X-2-080110
OE M MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME
称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹
VCC 1.8 4
R702
3.3 OHM 2W
on_BACKLI GHT 4
VCC 1.8
VCC 3.3D704
SR24
BL_ON
CN701
CONN
1
2
3
4
5
6
7
8
9
C713
0.1uF/16V