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Service Manual
ViewSonic VP930/b
Model No. VS10725
19" Color TFT LCD Display

(VP930/b_SM Rev. 1a Oct. 2005)

ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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.


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


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 10/19/05 Initial Release G. Han

ViewSonic Corporation Confidential - Do Not Copy VP930/b

1. Precautions and Safety Notices 1

2. Specification 5

3. Front Panel Function Control Description 10

4. Circuit Description 17
5. Adjustment Procedure 18
6. Troubleshooting Flow Chart 30

7. Recommended Spare Parts List 35

8. Exploded Diagram and Exploded Parts List 43

9. Block Diagram 50
10. Schematic Diagrams 51

11. PCB Layout Diagrams 57

ViewSonic Corporation Confidential - Do Not Copy VP930/b
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.

ViewSonic Corporation Confidential Do Not Copy VP930/b
(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.

ViewSonic Corporation Confidential Do Not Copy VP930/b
Correct Methods: Incorrect Methods:

Only touch the metal frame of the LCD Surface of the LCD panel is pressed by
panel or the front cover of the monitor.Do fingers and that will probably cause
not touch the surface of the polarizer. "Mura".

Take out the monitor with cushions Taking out the monitor by grasping the
LCD panel.That will probably cause

ViewSonic Corporation Confidential Do Not Copy VP930/b
Place the monitor on a clean and soft Placing the monitor on foreign objects.
foam pad. That will probably scratch the surface
of the panel or cause "Mura."

The panel is placed facedown on
the lap. That will probably cause

ViewSonic Corporation Confidential Do Not Copy VP930/b

GENERAL specification
Test Resolution & Frequency 1280x1024 @ 60Hz
Test Image Size Full Size
Factory Default:
Contrast and Brightness Controls Contrast = 70%, Brightness = 100%
Input Connector D-SUB1= DB-15(Analog)
D-SUB2= DB-15(Analog)
DVI= DVI-D(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 Compliant DDC 2B
Video RGB (Analog)
Video Signals Separate Sync / Composite Sync / SOG
TMDS (Digital)
Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)
Maximum PC Video Signal 950 mV with no damage to monitor
Maximum Mac Video Signal 1250 mV with no damage to monitor
Sync Signals TTL
DDC/CI Compliant with Revision 1.0
Sync Compatibility Separate Sync / Composite Sync / SOG

Shall be compatible with all PC type
Video Compatibility computers, Macintosh computers, and
after market video cards
640 x 350, 640 x 400, 640 x 480, 640 x
870, 720 x 400, 720 x 480, 720 x 576, 800
Resolution Compatibility x 600, 832 x 624, 1024 x 768, 1152 x 864,
1152 x 870, 1280 x 720, 1280 x 768, 1280
x 960, 1280 x 1024

Exclusions Not compatible with interlaced video

Horizontal / Vertical Frequency
Horizontal Frequency 24