VK222U
22" LCD Color Monitor ASUS VK222U/S
Service
Service
Service
Horizontal Frequency
30-82 KHz
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 Instruction…………...............……...........6
3.1.General Instructions...........................…...........6
3.2.Control Button…………….…..............……...............6
3.3.OSD Menu…………….…...........................…............9
4.Input/Output Specification............……………............14
4.1.Input Signal Connector............………….................14
4.2.Power Supply Requirements...............................15
4.3.Factory Preset Display Modes……..........................16
4.4.Panel Specification.....………...…………..................17
5.Block Diagram…..….....................…………................19
5.1.Software Flow Chart……………………....….......19
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6.Schematic……………......................................24
6.1.Main Board………..........................................24
6.2.Power Board...……....................................28
6.3.Audio Board...……....................................30
7.PCB Layout..………….......................................31
7.1.Main Board………........................................31
7.2.Power Board….......................................32
7.3.Audio Board….......................................34
7.4.Key Board…………….....................................35
8.Maintainability……….......................................36
8.1.Equipments and Tools Requirement...............36
8.2.Trouble Shooting…………..............................37
9.White-Balance, Luminance adjustment.............43
10.Monitor Exploded View………..…….…............45
11.BOM List…………………………………............46
12.Different Parts List……………………............74
5.2.Electrical Block Diagram……………..….......21
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 ASUS VK222U/S
Revision List
Version Release Date Revision History TPV Model Name
TC72MPFKW3USDI
TC72MPFCW3USDI
A00 Jan.23, 2008 Initial release
TC72MPFBW3USAI
TC72MPFTW3USAQ
TC72MPFBW3UEAI
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22" LCD Color Monitor ASUS VK222U/S
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
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damage the panel.)
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22" LCD Color Monitor ASUS VK222U/S
1. Monitor Specifications
Driving system TFT Color LCD
Size 22"
Pixel pitch 0.282mm( H )x 0.282mm( V )
LCD Panel
Response time (type) 5ms
Viewable angle 170˚ (H) 160˚ (V)
Video R,G,B Analog Interface
Sync. Type H/V TTL
Input
Power Consumption
Webcam Built-in USB2.0 1.3M
Display Color 16.7M
Dot Clock 160MHz
Contrast Ratio 1000:1
White Luminunce 210cd/m
Max. Resolution 1680 x 1050
Plug & Play VESA DDC2BTM
Power Source 100~240VAC,47~63Hz
Input Connector
H-Frequency 30kHz – 82kHz
V-Frequency 56-76 Hz
ON Mode ≤50W
OFF Mode ≤1W
2
D-Sub 15pin
DVI 22pin (only for VK222U )
Input Video Signal Analog:0.7Vp-p(standard),75 OHM, Positive
Safety Certifications
Maximum Screen Size
Environmental
Considerations
UL/CUL , FCC, CE, Gost-R, BSMI,CCC,VCCI,C-Tick, CB, RoHS required,PSB,
J-MOSS
Horizontal : 473.76mm
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Vertical: 296.1mm
Operating Temp: 0°C to 35°C
Storage Temp: -20°C to 60°C
Operating Humidity: 45% to 85%
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22" LCD Color Monitor ASUS VK222U/S
A
A
2. LCD Monitor Description
The LCD monitor will contain a main board, an audio 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.
LCD PANEL
LVDS wire
+ 5V
B/L control
Inverter
Circuit
Adaptor
Circuit
+12V
+5V
Audio
Board
udio Control
Scalar Board
Speakers
AC in
udio in
Key Board
D-SUB in
USB in
USB Scaler Board
1.3M Webcam Module
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22" LCD Color Monitor ASUS VK222U/S
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
for VK222U
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22" LCD Color Monitor ASUS VK222U/S
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22" LCD Color Monitor ASUS VK222U/S
for VK222S
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22" LCD Color Monitor ASUS VK222U/S
3.3 OSD Menu
3.3.1 How to Reconfigure
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22" LCD Color Monitor ASUS VK222U/S
3.3.2 OSD Function Introduction
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22" LCD Color Monitor ASUS VK222U/S
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22" LCD Color Monitor ASUS VK222U/S
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22" LCD Color Monitor ASUS VK222U/S
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22" LCD Color Monitor ASUS VK222U/S
4. Input/Output Specification
4.1 Input Signal Connector
Analog connectors
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
VGA connector layout
15
6
11 15
10
DVI connectors (only for VK222U)
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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22" LCD Color Monitor ASUS VK222U/S
4.2 Power Supply Requirements
A/C Line voltage range 100 V ~ 240 V
A/C Line frequency range
Input Voltage transients
Current 1.5A max at 100V; 0.8A max at 240 V
Peak surge current
Leakage current < 3.5mA
Power line surge
50 ± 3Hz, 60 ± 3Hz
90-264 voltage AC for 10 sec @40℃
< 60A peak at 240 VAC and cold starting
< 30A peak at 120VAC and cold starting
No advance effects (no loss of information or defect)
with a maximum of 1 half-wave missing per second
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22" LCD Color Monitor ASUS VK222U/S
4.3 Factory Preset Display Modes
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22" LCD Color Monitor ASUS VK222U/S
4.4 Panel Specification
4.4.1 General Features
TPM220Z1-PS3 IS A 22” WIDE TFT LIQUID CRYSTAL DISPLAY MODULE WITH 4 CCFL BACKLIGHT
UNIT AND 55PIN RSDS INTERFACE. THIS MODULE SUPPORTS 1680 X 1050 WSXGA+ MODE AND CAN
DISPLAY 16.7 M COLORS.
- Super Wide viewing angle.
- Super High contrast ratio
- Super fast response time
- High color saturation
- WSXGA+ (1680 x 1050 pixels) resolution
- RSDS (reduced swing differential signaling ) interface
- RoHS Compliance
4.4.2 Display Characteristics
4.4.3 Electrical Characteristics
(1) TFT-LCD
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22" LCD Color Monitor ASUS VK222U/S
(2) Backlight
4.4.4 Optical Characteristics
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22" LCD Color Monitor ASUS VK222U/S
5. Block Diagram
5.1 Software Flow Chat
1
2
N
4
5
Y
6
7
Y
Y
3
N
N
9
10
Y
N
12
Y
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N
18
19
N
15
11
13
17
N
Y
N
16
Y
Y
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22" LCD Color Monitor ASUS VK222U/S
1) MCU initialize.
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
disappear.
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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22" LCD Color Monitor ASUS VK222U/S
5.2 Electrical Block Diagram
5.2.1 Main Board
for VK222U
Keypad Interface
(CN403)
SCK
SCZ
Flash Memory
PM25LV010A
(U402)
Crystal
14.31818MHZ
(X401)
Panel Interface
(CN407)
Scalar TSUMO5RCWHQ-LF
(Include MCU, ADC, OSD)
(U401)
H sync
V sync
RGB
D-Sub
Connector
(CN405)
EEPROM
AF24BC16-SI
(U403)
D-Data
D-Clock
DVI
Connector
(CN406)
SCL_VGA,
SDA_VGA
SCL_DVI
SDA_DVI
EEPROM
M24C02
(U404)
EEPROM
M24C02
(U405)
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22" LCD Color Monitor ASUS VK222U/S
for VK222S
Keypad Interface
(CN403)
SCK
SCZ
Flash Memory
PM25LV010A
(U402)
Panel Interface
Scalar TSUMO5RCWHQ-LF
(Include MCU, ADC, OSD)
Crystal
14.31818MHZ
(X401)
(CN407)
(U401)
D-Sub
Connector
(CN405)
EEPROM
AF24BC16-SI
(U403)
H sync
V sync
RGB
SCL_VGA,
SDA_VGA
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EEPROM
M24C02
(U404)
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