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Service Manual
ViewSonic VA912-4
VA912b-4
Model No. VS10867
19" Color TFT LCD Display
(VA912-4_VA912b-4_SM Rev. 1b Dec. 2005)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
Copyright
Copyright 2005 by ViewSonic Corporation. All rights reserved. No part of this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or
computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual or otherwise, without the prior written permission of ViewSonic Corporation.
Disclaimer
ViewSonic makes no representations or warranties, either expressed or implied, with respect to the
contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular
purpose. Further, ViewSonic reserves the right to revise this publication and to make changes from time
to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or
changes.
Trademarks
Optiquest is a registered trademark of ViewSonic Corporation.
ViewSonic is a registered trademark of ViewSonic Corporation.
All other trademarks used within this document are the property of their respective owners.
Revision History
Revision SM Editing Date ECR Number Description of Changes Editor
1a 11/09/05 Initial Release G. Han
1b 12/01/05 Add assembling, handling notice, packing, firmware documents Jamie Chang
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TABLE OF CONTENTS
1. Precautions and Safety Notices 1
2. Specification 5
3. Front Panel Function Control Description 11
4. Circuit Description 13
5. Adjustment Procedure 24
6. Troubleshooting Flow Chart 52
7. Recommended Spare Parts List 55
8. Exploded Diagram and Exploded Parts List 61
9. Block Diagram 65
10. Schematic Diagrams 66
11. PCB Layout Diagrams 71
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1. Precautions and Safety Notices
1. Appropriate Operation
(1) Turn off the product before cleaning.
(2) Use only a dry soft cloth when cleaning the LCD panel surface.
(3) Use a soft cloth soaked with mild detergent to clean the display housing.
(4) Use only a high quality, safety approved AC/DC power cord.
(5) Disconnect the power plug from the AC outlet if the product will not be used for a long period of time.
(6) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display off.
(7) Do not touch the LCD panel surface with sharp or hard objects.
(8) Do not place heavy objects on the LCD display, video cable, or power cord.
(9) Do not use abrasive cleaners, waxes or solvents for your cleaning.
(10) Do not operate the product under the following conditions:
- Extremely hot, cold or humid environment.
- Areas containing excessive dust and dirt.
- Near any appliance generating a strong magnetic field.
- In direct sunlight.
2. Caution
No modification of any circuit should be attempted. Service work should only be performed after you are thoroughly familiar
with all of the following safety checks and servicing guidelines.
3. Safety Check
Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit, the voltage is
exposed in such areas as the associated transformer circuits.
4. LCD Module Handling Precautions
4.1 Handling Precautions
(1) Since front polarizer is easily damaged, pay attention not to scratch it.
(2) Be sure to turn off power supply when connecting or disconnecting input connector.
(3) Wipe off water drops immediately. Long contact with water may cause discoloration or spots.
(4) When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth.
(5) Since the panel is made of glass, it may break or crack if dropped or bumped on hard surface.
(6) Since CMOS LSI is used in this module, take care of static electricity and ensure human earth when handling.
(7) Do not open or modify the Module Assembly.
(8) Do not press the reflector sheet at the back of the module in any direction.
(9) In the event that a Module must be put back into the packing container slot after it was taken out of the
container, do not press the center of the CCFL Reflector edge. Instead, press at the far ends of the
CFL Reflector edge softly. Otherwise the TFT Module may be damaged.
(10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate or tilt the Interface
Connector of the TFT Module.
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(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist or
bend the TFT Module even momentarily. When designing the enclosure, it should be taken into consideration
that no bending/twisting forces may be applied to the TFT Module from outside. Otherwise the TFT Module
may be damaged.
(12) The cold cathode fluorescent lamp in the LCD contains a small amount of mercury. Please follow local
ordinances or regulations for disposal.
(13) The LCD module contains a small amount of materials having no flammability grade. The LCD module
should be supplied with power that complies with the requirements of Limited Power Source
(IEC60950 or UL1950), or an exemption should be applied for.
(14) The LCD module is designed so that the CCFL in it is supplied by a Limited Current Circuit (IEC60950
or UL1950). Do not connect the CCFL to a Hazardous Voltage Circuit.
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VA912-4 series handling Notice
Correct Method Incorrect method
Correct Method Incorrect method
Correct Method Incorrect method
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Correct Method Incorrect method
Correct Method Incorrect method
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2. Specification
1 PRODUCT DEFINITION AND SPECIFICATION
VSA VSAP VSE VSCN
Region
(M) (A)/(S)/(K) (E)/(U) (G)
Product Name VA912/b-4 / VA912-4U
Model Number VS10867
English, French, German, Italian, Spanish,
OSD Languages Finnish, Japanese, Traditional Chinese,
Simplified Chinese
TFT LCD Panel and Model # Vendor : HSD, Model # : 190ME13 A02
Scalar Model # : RTD 2523
Input Signal Analog / Digital
Sync Compatibility Separate
Audio 1W x 2
a. Refer to Appendix D
b. U model: (2 power cables are required)
Power Cable
1. Schuko CEE7-7 Type Plug
2. Separate 3-prong BS 1363 Type Plug
Analog Cable (1.8 m, color : black), with PC
YES
2001 and Hot Plug Detect &DDC
Audio Cable (1.8m, Color: black) with PC
YES
2001
DVI Cable(1.8m, color: black) with PC 2001 YES YES No YES
ViewSonic CD Wizard Arabic, English, Finnish, Spanish, German,
Italian, Swedish, Polish, Korean, Portuguese,
ViewSonic Quick Start Guide Russian, French, Simplified Chinese, Traditional
Chinese, Hungary, Czech, Turkish
Screen Protector Mylar YES YES YES YES
Warranty Sticker NO NO NO YES
Warranty Card NO NO NO YES
Carton Sticker NO NO NO YES
PE bag of Carton NO NO NO YES
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This product specification is divided into the following categories:
4-1 General Specification 4-11 Environmental
4-2 Video Interface 4-12 Manuals and Documents
4-3 Power Supply 4-13 Regulatory and Safety
4-4 Electrical Requirement 4-14 Video Communications
4-5 Front Panel Control and Indicators 4-15 Coding Assignment
4-6 Audio Interface 4-16 Reliability
4-7 TFT LCD Panel 4-17 Mass Production Release
4-8 Image Performance 4-18 ECR / ECN
4-9 Mechanical 4-19 Service
4-10 Packaging
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GENERAL specification
Test Resolution & Frequency 1280x1024 @ 60Hz
Test Image Size Full Size
Factory Default:
Contrast and Brightness Controls
Contrast = 70%, Brightness = 100%
VIDEO INTERFACE
Analog Input Connector DB-15 (Analog), refer the appendix A
Digital Input Connector DVI-I (digital)
Default Input Connector Defaults to the first detected input
Equal to twice the weight of the monitor for
Video Cable Strain Relief
five minutes
Video Cable Connector DB-15 Pin out Compliant DDC 2B
1. Video RGB (Analog)
Video Signals 2. DVI (Digital)
Separate
Video Impedance 75 Ohms (Analog)
Maximum PC Video Signal 950 mV with no damage to monitor
Maximum Mac Video Signal 1250 mV with no damage to monitor
Sync Signals LVDS
DDC 2B Compliant with Revision 1.3
Sync Compatibility Separate Sync
Shall be compatible with all PC type
Video Compatibility computers, Macintosh computers, and after
market video cards
640 x 350*, 640 x 480, 720 x 400* (640 x
400*), 800 x 600, 832 x 624, 1024 x 768,
1152 x 870, 1280 x 720, 1280 x 960, 1280 x
Resolution Compatibility 1024
* The image vertical size might not be full screen.
But the image vertical position should be at the center.
Exclusions Not compatible with interlaced video
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POWER SUPPLY
Power Supply (Adapter) FSP043-2PI01
Input Voltage Range 90 TO 264 VAC
Input Frequency Range 47 TO 63 HERTZ
Short Circuit Protection Output can be shorted without damage
Over Current Protection 5.13 A typical at 18.1 VDC
Leakage Current 0.25mA (Max) at 264VAC / 50Hz
EFFICIENCY 80 % typical at 115VAC Full Load
Fuse Internal and not user replaceable
Power Dissipation 65 Watts
Max Input AC Current 1.8Arms @ 90VAC,
INRUSH CURRENT (COLD START) 100 A @ 240VAC , 50Hz
Shall start and function properly when under
full load, with all combinations of input
Power Supply Cold Start
voltage, input frequency, and operating
temperature
Shall be able to withstand an EN61000-4-4
Power Supply Transient Immunity