Asus VB171T User manual

17" LCD Color Monitor ASUSVB171T&S
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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…………….…...........................…............7
4.Input/Output Specification............………….…............11
4.1.Input Signal Connector............…………................11
4.2.Power Supply Requirements....................................12
4.3.Factory Preset Display Modes……..........................13
4.4.Panel Specification.....………...…………..................13
5.Block Diagram…..….....................…………................15
5.1.Software Flow Chart……………………....….......17
5.2.Electrical Block Diagram……………..….......19
6.Schematic……………......................................21
6.1.Main Board………..........................................21
6.2.Power Board...……....................................26
6.3.Audio Board...……....................................28
7.PCB Layout..………….......................................29
7.1.Main Board………........................................29
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………………...……............75
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
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17" LCD Color Monitor ASUSVB171T&S
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Revision List
Version Release Date Revision History TPV Model Name
A00 May.28, 2007 Initial release
T77SMKDDHGUSD
T77SMKDKHGUSDN
A01 Jul.20,2007
Add new BOM in Item 11 T77SMWDTHGUSA
Add new BOM in Item 12
T77SMKDCHGU2DN
T77SMKDCHGUSD
A02 Oct.22,2007 Add new BOM in Item 12
T77SMKDCHGU2DZ
T77SMKDDHGUSDZ
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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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1. Monitor Specifications
LCD Panel
Driving system TFT Color LCD
Size 17"
Type LTM170EU-L31
Pixel pitch 0.264mm( H )x 0.264mm( V )
Response time (type) 5ms for SEC panel
Viewable angle 160˚(H) 160˚(V) (CR≥10)
Video
R,G,B Analog Interface
Digital Interface
Input
Sync. Type H/V TTL
H-Frequency 30kHz – 82kHz
V-Frequency 56-76 Hz
Power Consumption
ON Mode <42W
OFF Mode <2W
Display Color 16.7M
Dot Clock 150MHz
Contrast Ratio 1000:1
White Luminance 300cd/m2
Max. Resolution 1280 x 1024
Plug & Play VESA DDC2BTM
Power Source 100~240VAC,47~63Hz
Input Connector
D-Sub 15pin
DVI 24pin
Input Video Signal
Analog:0.7Vp-p(standard),75 OHM, Positive
Digital signal
Safety Certifications UL/CUL , FCC, CE, Gost-R, BSMI,CCC,VCCI,C-Tick, CB, RoHS required
Maximum Screen Size Horizontal : 337.920mm
Vertical: 270.336mm
Environmental
Considerations
Operating Temp: 0°C to 35°C
Storage Temp: -20°C to 60°C
Operating Humidity: 45% to 85%
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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.
Monitor Block Diagram
AC-IN
100V-240V
Power board
(
Include: ada
p
ter
,
inverter
)
Flat Panel and
CCFL backlight
Main Board RS232 Connector
For white balance
adjustment in factory
mode
CCFL Drive.
Video signal, DDC
Key Board
Audio Board
HOST Computer
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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
3.2.1 Key Control
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3.2.2 Key Function
3.3 OSD Menu
3.3.1 How to Reconfigure
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3.3.2 OSD Function Introduction
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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
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
610
11 15
DVI connectors
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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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
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4.3 Factory Preset Display Modes
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4.4 Panel Specification
4.4.1 Features
RoHS compliance (Pb-free)
High contrast ratio, high aperture ratio, fast response time
TN(Twisted Nematic) mode
2 dual CCFTs(Cold Cathode Fluorescent Tube)
DE(Data Enable) mode
LVDS (Low Voltage Differential Signaling) interface (2pixel/clock)
COMPACT SIZE DESIGN
TCO’03 compliance
4.4.2 Display Characteristics
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4.4.3 Optical Characteristics
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4.4.4 Electrical Characteristics
(1) TFT-LCD
(2) Backlight
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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
N16
17
19
Y
N
18
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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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5.2 Electrical Block Diagram
5.2.1 Main Board
Flash Memory
PM25LV010A
(U402)
Panel Interface
(CN703)
SDA
SCL
Crystal
14.31818MHZ
(X401)
Keypad Interface
(CN404)
Scalar TSUM56AWHK-LF
(Include MCU, ADC, OSD)
(U401)
D-Sub
Connector
(CN401)
EEPROM
M24C02
(U403)
H sync
V sync
RGB
VGA_SDA,
VGA_SCL
DVI
Connector
(CN402)
EEPROM
M24C02
(U404)
D-Data
D-Clock
DVI_SDA,
DVI
_
SCL
EEPROM
M24C02
(U406)
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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
Circui
t
Transformer MOSFET
Lamp
ON/OFF
5V
Bridge
Rectifier
and Filter
Feedback
Circuit
Rectifier
diodes
CN902
Output
Circui
t
PWM
Control IC
（IC801）
Over Voltage
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