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Service Manual
ViewSonic VX910-1
Model No. VS10162
19" Color TFT LCD Display
(VX910_SM_834 Rev. 1a June 2004)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
Copyright
Copyright 2004 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 Date Description Of Changes Approval
1a 06/07/04 Initial Release DCN-4474 Angela Lu
ViewSonic Corporation Confidential - Do Not Copy VX910
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TABLE OF CONTENTS
1. Precautions and Safety Notices 1
2. Specification 2
3. Front Panel Function Control Description 3
4. Circuit Description 10
5. Adjusting Procedure 22
6. Trouble Shooting Flow Chart 30
7. Recommended Spare Parts List 36
8. Exploded Diagram And Spare Parts List 40
9. Block Diagram 42
10. Schematic Diagrams 44
11. PCB Layout Diagrams 50
ViewSonic Corporation Confidential - Do Not Copy VX910
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1. Precautions and Safety Notices
1. 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 guide line
2. Safety Check :
Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter
circuit. These voltage are exposed in such areas as the associated transformer circuits .
3. POWER SUPPLY REQUIREMENTS
The internal power converter for this display utilizes AC and DC cords , AC cord is detachable , but DC
cord is permanently attached . Any attempt to replace another power board could result in serious problem
on the display .
4. LEAKAGE CURRENT HOT CHECK
4-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this check.
4-2 Connect a 1500 ohm , 10 watt resistor , paralleled by a 0.15uF capacitor between each metallic part
and a good earth ground
4-3 Use an AC voltmeter with 1000 ohm / volt or more sensitivity and measure the AC voltage across
the combination 1500 ohm resistor and 0.15uF capacitor.
4-4 Move the resistor connection to each exposed metallic part and measure the voltage.
4-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement.
4-6 Voltage measured must not exceed 1.5 volt RMS, from any exposed metallic part to the ground. A
leakage current tester may be used in the above hot check, in which case any circuit measured must
not exceed 1.0 milliamp. In the case of a measurement exceeding the 1.0 milliamp value, a rework
is required to eliminate the chance of a shock hazard .
AC VOLTMETER
V
0.15u
.
To Metal Parts 1500 10W Earth Ground
ViewSonic Corporation Confidential - Do Not Copy VX910
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2. Specification
Mechanical :
Dimension ( W x H x D ) mm
Set : a. with stand : 430.8 x 468.4 x 201 mm
b. Without stand : 430.8 x 370.2 x 66.2 mm
Slim bezel : 19.0 / 19.0 / 22.0 / 22.0
Base (L X W) : 286 x 201 mm
Packing : ( W x H x D ) mm : 496 x 532 x 247 mm
Weight : Net / Gross ( Kg ) : 6.7 / 8.5
Wall Mount (VESA) : 100 x 100 mm
LCD Panel type : LG / LM190E03 Rev.03
Max. resolution (HxV) : 1280 x 1024
Nominal picture size (HxV) : 376.3 mm x 301.1 mm
Display colors : 16.2 M ( 6 bit + dithering )
Dot pitch : 0.264 mm
Response time : 4+12 / 16ms (Tr + Tf / typical)
Brightness (100% white) : Typical : 250 cd/m