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Service Manual
  ViewSonic VE710s/b-21
                VA721
                                      Model No. VS10047
                   17" Color TFT LCD Display




                                       (VE710s/b-2_VA721_SM_770_1b Rev.1b Nov. 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          03/11/04          3765                 Initial Release                                      A. Lu

                                                         Change Scaler from MST P/N: 2365929896
      1b         11/02/04          4778        4716      To RealTek 2023 P/N: 2365930896                      A. Lu




ViewSonic Corporation                                                            Confidential - Do Not Copy   VE710s/b-2
                                                         i                                                    VA721
                                TABLE OF CONTENTS


         1.   Precautions and Safety Notices                                           1

         2.   Specification                                                            2

         3.   Front Panel Function Control Description                                 4

         4.   Circuit Description                                                     10
         5.   Adjusting Procedure                                                     16
         6.   Trouble Shooting Flow Chart                                             30

         7.   Recommended Spare Parts List                                            32

         8.   Exploded Diagram And Spare Parts List                                   49
         9.   Block Diagram                                                           52
        10.   Schematic Diagrams                                                      53

        11.   PCB Layout Diagrams                                                     59




ViewSonic Corporation                                    Confidential - Do Not Copy    VE710s/b-2
                                            ii                                         VA721
 1. Precautions and Safety Notices


    1.1. SAFETY PRECAUTIONS
         This monitor is manufactured and tested on a ground principle that a user's safety comes first. However, improper
         use or installation may cause damage to the monitor as well as to the user. Carefully go over the following
         WARNINGS before installing and keep this guide handy.


         WARNINGS:
         .This monitor should be operated only at the correct power sources indicated on the label on the rear end of the
         monitor. If you're unsure of the power supply in your residence, consult your local dealer or power company.

         

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