ViewSonic Va1903wb2 Service Manual

 
- 1 – 
ViewSonic Corporation              
 Confidential - Do Not Cop                      VA1903wb/VA1903wm 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                          Manufacture Date: Dec-25-06             
 
 
                                
Service Manual 
ViewSonic VA1903wb/VA1903wm 
Model No VS11618 
19” Color TFT LCD Display  

 
- 2 – 
ViewSonic Corporation              
 Confidential - Do Not Cop                      VA1903wb/VA1903wm 
Copyright Information 
Copyright © ViewSonic® Corporation, 2006. All rights reserved. 
Macintosh and Power Macintosh are registered trademarks of Apple Computer, Inc. 
Microsoft, Windows, Windows NT, and the Windows logo are registered trademarks of 
Microsoft Corporation in the United States and other countries. 
ViewSonic, the three birds logo, OnView, ViewMatch, and ViewMeter are registered...

 
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ViewSonic Corporation              
 Confidential - Do Not Cop                      VA1903wb/VA1903wm 
TABLE OF CONTENTS 
 
1. Precautions And Safety Notices                                  4 
2. Specification                                                   7 
3.  Front Panel Control And Indicators                                      9 
4. Circuit Description                                              15 
5. Adjustment Procedure                                          25 
6....

 
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ViewSonic Corporation              
 Confidential - Do Not Cop                      VA1903wb/VA1903wm 
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 
the user. Carefully go over the following WARNINGS before installing and keep this guide 
handy. 
 
 WARNINGS 
      ．This monitor should be operated only at...

 
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ViewSonic Corporation              
 Confidential - Do Not Cop                      VA1903wb/VA1903wm 
1.4   HANDING AND PLACING METHODS  
Correct Methods:    Incorrect Methods:   
Only touch the metal frame of the LCD 
panel or the front cover of the monitor. Do 
not touch the surface of the polarizer.   Surface of the LCD panel is pressed by fingers 
and that may cause “Mura.”   
  
 
 
Take out the monitor with cushions   Taking out the monitor by grasping the LCD 
panel. That may cause...

 
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ViewSonic Corporation              
 Confidential - Do Not Cop                      VA1903wb/VA1903wm 
Place the monitor on a clean and soft foam 
pad. Placing the monitor on foreign objects. That 
could scratch the surface of the panel or cause 
“Mura.” 
 
Place the monitor on the lap, the panel 
surface must be upwards. The panel is placed facedown on the lap. That 
may cause “Mura.” 
 
 
 
 
 
 
 
 
 
 
 
 
 
  

 
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ViewSonic Corporation              
 Confidential - Do Not Cop                      VA1903wb/VA1903wm 
2.  Specification 
 
2.1 PRODUCT SPECIFICATIONS 
Typ e  
19.0” (full 19” wide viewable diagonal area), 
TFT(Thin Film Transistor),Active Matrix WXGA+ LCD 
Color Filter  RGB vertical stripe 
LCD 
Glass Surface  Anti-Glate 
Input Signal  Video Sync 
RGB analog(0.7/1.0 Vp-p, 75ohms) 
Separate Syic, 
Fh:24-82 kHz, Fv:50-75 Hz 
Compatibility PC 
Macintosh Up to 1440 x 900 Non-interlaced 
Power...

 
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ViewSonic Corporation              
 Confidential - Do Not Cop                      VA1903wb/VA1903wm 
2.2  INTERFACE DESCRIPTION 
 
 
D-SUB 15 PIN CONNECTOR       
 
       
15
6
10
11 15
                         
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
SIGNAL LEVEL 
 
 
 
Pin Number  Pin Function 
1  Red video input 
2  Green video input 
3  Blue video input 
4 No Connection 
5 Ground 
6  Red video ground 
7  Green video ground 
8  Blue video ground 
9 +5V 
10 H/V sync ground 
11  N o  c o...

 
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ViewSonic Corporation              
 Confidential - Do Not Cop                      VA1903wb/VA1903wm 
3.   Front Panel Function Controls And Indicators  
 
 
  

 
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ViewSonic Corporation              
 Confidential - Do Not Cop                      VA1903wb/VA1903wm 
Do the following to adjust the display setting:  
1. To display the Main Menu, press button [1].   
 
NOTE: All OSD menus and adjustment screens disappear automatically after about 15 
seconds. This is adjustable through the OSD timeout setting in the setup menu.   
2. To select a control to adjust, press ▲or ▼ to scroll up or down in the Main Menu.   
3. After the desired control is selected,...