Text preview for : VE902m_SM_940.pdf part of Viewsonic VE902m SM 940 Viewsonic Мониторы LCD Мониторы LCD Viewsonic VE902M-1 VE902m-1 VE902m_SM_940.pdf
Back to : VE902m_SM_940.pdf | Home
Service Manual
ViewSonic VE902m-1
Model No. VS10552
19" Color TFT LCD Display
(VE902m_SM_940 Rev. 1a Dec. 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
Documents Number
Revision SM Editing Date Description of Changes Editor
DCN Number ECR Number
1a 12/06/04 4867 Initial Release A. Lu
ViewSonic Corporation Confidential - Do Not Copy VE902m
i
TABLE OF CONTENTS
1. Precautions and Safety Notices 1
2. Specification 5
3. Front Panel Function Control Description 9
4. Circuit Description 14
5. Adjusting Procedure 17
6. Trouble Shooting Flow Chart 41
7. Recommended Spare Parts List 46
8. Exploded Diagram And Spare Parts List 51
9. Block Diagram 54
10. Schematic Diagrams 55
11. PCB Layout Diagrams 64
ViewSonic Corporation Confidential - Do Not Copy VE902m
ii
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 high quality and safety approved AC/DC power cord.
(5) Disconnect the power plug from AC outlet if the product is not 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 susceptible to excessive dust and dirt.
- Near any appliance generating a strong magnetic field.
- Place 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 inserting or disconnecting from input connector.
(3) Wipe off water drop 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 insure human earth when handling.
(7) Do not open nor modify the Module Assembly.
(8) Do not press the reflector sheet at the back of the module to any directions.
(9) In case if a Module has to be put back into the packing container slot after once it was taken out from 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 nor tilt the Interface
Connector of the TFT Module.
ViewSonic Corporation Confidential - Do Not Copy VE902m
1
(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist nor
bend the TFT Module even momentary. At designing the enclosure, it should be taken into consideration that
no bending/twisting forces are applied to the TFT Module from outside. Otherwise the TFT Module may be
damaged.
(12) Cold cathode fluorescent lamp in LCD contains a small amount of mercury. Please follow local ordinances or
regulations for disposal.
(13) Small amount of materials having no flammability grade is used in the LCD module. The LCD module should
be supplied by power complied with requirements of Limited Power Source (IEC60950 or UL1950), or be
applied exemption.
(14) The LCD module is designed so that the CFL in it is supplied by Limited Current Circuit (IEC60950 or
UL1950). Do not connect the CFL in Hazardous Voltage Circuit.
ViewSonic Corporation Confidential - Do Not Copy VE902m
2
Correct methods : Incorrect Methods :
Only touch the metal-frame of the panel or the front Surface of the panel is pressed by fingers & this may
cover of the monitor. cause " MURA "
Do not touch the surface of the polarize .
Take out the monitor with cushion Take out the monitor by grasping the LCD panel.
That may cause " MURA".
ViewSonic Corporation Confidential - Do Not Copy VE902m
3
Correct Methods : Incorrect Methods :
Place the monitor on a clean & soft foam pad . Place the monitor on foreign objects .
That could scratch the surface of panel
ViewSonic Corporation Confidential - Do Not Copy VE902m
4
2. Specification
2-1 General Specifications
Item Specification Unit
Active Area 376.32 (H) x 301.056 (V) (19.0" diagonal) mm
Driver Element a-si TFT Active Matrix -
Pixel Number 1280 x R.G.B. x 1024 pixel
Pixel Pitch 0.294 (H) x 0.294 (V) mm
Pixel Arrangement RGB Vertical Stripe -
LCD panel Display Color 16.2M color
Tran missive Mode Normally Black -
Viewing Angle (H / V) Typical 170 / 170 degree
Brightness Typical 300 cd/m2
Contrast Ratio Typical 800 -
LC Response Time (Tr+Tf) 23 (Tr: 14 + Tf: 9) msec
Separate Sync. TTL Level -
Horizontal Sync. Positive / Negative -
Graphic
Vertical Sync. Positive / Negative -
Input Connector D-Sub mini 15 pins, DVI-D 24 pins -
Auto Adjust Clock, Phase, H Position & V Position -
Screen Scaling VGA/SVGA/XGA/SXGA Full Screen Display -