Viewsonic Va720-1 User manual

Service Manual

ViewSonic VA720-1

Model No. VLCDS23895-3W

17” Color TFT LCD Display

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

VE175/b-1

(VA720-1_SM_542 - Rev. 1a – May 2002)

ViewSonic

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

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

1.a 5/28/02 Initial Issue – DCN2251 K. Yang

ViewSonic Corporation ii Confidential – Do Not Copy

VA720-1

VE175/b

TABLE OF CONTENTS

1. PRECAUTIONS & SAFETY NOTICES....................................................................................1

2. SERVICE TOOLS & EQUIPMENT REQUIRED .....................................................................2

3. SPECIFICATIONS .................................................................................................................3~4

4. EXPLODED VIEW & PARTS LIST......................................................................................5~6

5. BLOCK DIAGRAM ...................................................................................................................7

6. SCHEMATIC DIAGRAMS..................................................................................................8~15

7. THEORY OF OPERATION.....................................................................................................16

8. WIRING DIAGRAM................................................................................................................17

9. PCB LAYOUT ....................................................................................................................18~23

10. TROUBLE SHOOTING FLOW CHART ........................................................................24~27

11. ADJUSTMENT……………………. .................................................................................28~30

12. ELECTRICAL PARTS LIST............................................................................................31~38

ViewSonic Corporation iiiConfidential – Do Not Copy

VA720-1

VE175/b

1. PRECAUTIONS & SAFETY NOTICES

1. PRECAUTION AND NOTICES

1.1. SAFETY PRECAUTIONS





 ! !#$%&



%%

 



'

(             %  

%%)

(     %        

&%

$%&%

* %



    %     %     

%

+%,-

(%,

1.2. PRODUCT SAFETY NOTICE

.

  %    % % %   

/

%

&0

1.3. SERVICE NOTES

 %%



1 234

%&%5%

6 +

7 +

5 '

ViewSonic Corporation 1

Confidential – Do Not Copy

VA720-1

VE175/b

2. SERVICE TOOLS & EQUIPMENT REQUIRED

2. SERVICE TOOL & EQUIPMENT REQUIRED

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ViewSonic Corporation 2

Confidential – Do Not Copy

VA720-1

VE175/b

3. SPECIFICATIONS

ViewSonic Corporation 3

Confidential – Do Not Copy

VA720-1

VE175/b

3. SPECIFICATIONS

3.1. PRODUCT SPECIFICATIONS

8(* <@AB

*. 9$-9$

(*.$%

C1

(%  $D#1=@E@17234

*3( @1;724E@1;72-4

8(( ;<..32=%4

-  @

0F=5GH=5G

-F=5GH=5G

 HI@G6G

  5@@F24

/ 1@@?24

15@?24

 F5F@

( 66<I124E1<@672-4

 :F@GJH7@G

$F1@GJH;@G

 '8$($K-9B/-(9/9$

* "-F@@J17@-

F5@2.34

ViewSonic Corporation 4

Confidential – Do Not Copy

VA720-1

VE175/b

3.2. FACTORY SUPPORTING MODES

**F -9$1=@3@17L;@0

8&%F  "!(;7@365@L<@067<&0?H

1 "!(<1@37@@L<@067;<&0H?

6 -9$;7@37=@L;@067;I&0?

7 -9$;7@37=@L<106<=;&0?

5 -9$;7@37=@L<506<5&0?

; .;7@37=@L;<065&0

< -9$=@@3;@@L5;0655;&0H?H

= -9$=@@3;@@L;@06<=<I&0H?H

I -9$=@@3;@@L<107=@<<&0H?H

@ -9$=@@3;@@L<507;=<5&0H?H

 .=613;17L<507I<15&0

1 -9$@173<;=L;@07=6;6&0?

6 -9$@173<;=L<@05;7<;&0?

7 -9$@173<;=L<105=@6;&0?

5 -9$@173<;=L<50;@@16&0H?H

; .@173<;=L<50;@17&0

< -9$1=@3@17L;@0;6I=&0H?H

= -9$1=@3@17L<50<II<;&0H?H

I .513=<@L<50;=;&0

3.3. D-SUB CONNECTOR





  

9( @<2-"(9:4

# # 99! @<2-"(9:4

/ /8'9 @<2-"(9:4

 ?$>! 8

- -?$>! 8

$( ((?1/ 8

$8 ((?1/ 8

12345

678910

11 12 13 14 15

  

  

! " !#$

 %& $

  

4.1. EXPLODED VIEW

5B06

5B05

5B01

1F29

X21F30

5B03

X35B07

2C20

5B02 X4

5B09

5B08

2C05

2C04

2C22

2C03

2C01

1F31 X2 X5

2C21

1F12 P953 X21F13

1F14 I/O CABLE

1F20

1F18

1F06 X4

1F07X2

1F16 X2

1F18

1F27

1F26

V901

1F05

1F17X6

1F09 X4

1F02

1F01

1F19

1F03

1F04 X2

2C03

1F22

1F28

1F23 X2

1F15X2 X4

1F08

1F21

1F10 1F11

FIG.1

FIG.2

FIG.1

MAIN PCB ASS'Y

1F24

1F25

FIG.3

U901

9H01

9S01

I801

D804

9S02

POWER PCB ASS'Y

FIG.4

9H02

CON. PCB ASS'Y

PCB

9R01

D701

FIG.4

ViewSonic Corporation 5Confidential – Do Not Copy

VA720-1

VE175/b

4. EXPLODED VIEW & PARTS LIST

4.2. EXPLODED VIEW PARTS LIST

ViewSonic Corporation 6

Confidential – Do Not Copy

VA720-1

VE175/b

      

     

     

    !  "

    #$ %! 

  &' %  

  &' %  

  &'  !  "

  $(  )* + 

   ,-# 

  $($ )*+$ 

  $(  )* + 

  $(  )* + 

  $(  )* + 

  !  #,* + 

  $(  )* + 

   ,-#../ 

  $(  )* + 

  $($ $$) 

  $(  )* + 

  $(  )* + 

  $(  )* + 

  $(  )* + 

   / $  

   !! #0#1  

   !! #0#1'  %"

  & #,$ 

  !  ,-#.. 

  $(  )* + 

  $(  )* + 

  $(  )* + 

  '() ,-#.. 

  '() ,-#.. 

  !  /'/ 

  '() ,-# 

  $(  )* + 

  $(  )* + 

  '   

  ' '*+  

  '  !  "

  $(  )* +  

  $(  )* +*'+  %"

   !  

   !'*+  

   ! !  "

  $(  )* +  

  $(  )* +*'+  %"

  ! 2&3'434 

  $(  )* +  %"

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