ViewSonic Va1903wb2 Service Manual

							 
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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  
						

							 
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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 
trademarks of ViewSonic Corporation. 
VESA is a registered trademark of the Video Electronics Standards Association. DPMS 
and DDC are trademarks of VESA. 
ENERGY STAR
® is a registered trademark of the U.S. Environmental Protection Agency 
(EPA). As an ENERGY STAR® partner, ViewSonic Corporation has determined that this 
product meets the ENERGY STAR® guidelines for energy efficiency. 
Disclaimer: ViewSonic Corporation shall not be liable for technical or editorial errors or 
omissions contained herein; nor for incidental or consequential damages resulting from 
furnishing this material, or the performance or use of this product. 
In the interest of continuing product improvement, ViewSonic Corporation reserves the 
right to change product specifications without notice. Information in this document may 
change without notice. 
No part of this document may be copied, reproduced, or transmitted by any means, for any 
purpose without prior written permission from ViewSonic Corporation. 
Copyright © ViewSonic
® Corporation, 2006. All rights reserved. No part of this publication 
may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into 
any language or manual or otherwise, without the prior written permission of ViewSonic
® 
Corporation.
                
               
                
      Revision History 
             
Revision Date  Description of changes  Approval 
A00 Dec-25-06  Initial Release  YG.WANG 
      
      
      
      
    
     
						

							 
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ViewSonic Corporation              
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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.  Troubleshooting Flow Chart                                       44 
7. Recommended Spare Parts List                                 45 
8.  Exploded Diagram And Spare Parts List                            60 
9. Disassemble Process                                          64 
10. Block Diagram                                               69 
11.  Schematic Diagram                                           70 
12. PCB Layout Diagram                                          79 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
						

							 
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ViewSonic Corporation              
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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 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 you local dealer or power company. 
      ．Use only the special power adapter that comes with this monitor for power input. 
．Do not try to repair the monitor your self as it contains no user-serviceable parts. This 
monitor should only be repaired by a qualified technician. 
．Do not remove the monitor cabinet. There is high-voltage parts inside that may cause 
electric shock to human bodies, even when the power cord is unplugged. 
．Stop using the monitor if the cabinet is damaged. Have it checked by a service technician. 
．Put your monitor only in a clean, dry environment. If it gets wet, unplug the power cable 
immediately and consult your service technician. 
．Always unplug the monitor before cleaning it .Clean the cabinet with a clean, dry cloth. 
Apply non-ammonia based cleaner onto the cloth, not directly onto the glass screen. 
．Keep the monitor away from magnetic objects, motors, TV sets, and transformer. 
．Do not place heavy objects on the monitor or power cord. 
 
1.2 PRODUCT SAFETY NOTICE 
Many electrical and mechanical parts in this chassis have special safety visual inspections 
and the protection afforded by them cannot necessarily be obtained by using replacement 
components rated for higher voltages, wattage, etc. Before replacing any of these 
components read the parts list in this manual carefully. The use of substitute replacement 
parts which do not have the same safety characteristics as specified in the parts list may 
create shock, fire ,or other hazards. 
 
1.3 SERVICE NOTES 
1.  When replacing parts or circuit boards, clamp the lead wires around terminals before            
soldering. 
2.  When replacing a high wattage resistor(more than 1W of metal oxide film resistor) in 
circuit board, keep the resistor about 5mm away from circuit board. 
3.  Keep wires away from high voltage, high temperature components and sharp edges. 
4.  Keep wires in their original position so as to reduce interference. 
5.  Usage of this product please refer to also user’s manual. 
 
 
 
  
						

							 
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ViewSonic Corporation              
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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 “Mura.”   
 
  
						

							 
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ViewSonic Corporation              
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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              
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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 Macintosh up to 1440 x 900 
Resolution Recommended 
and supported 1440 x 900 @ 60, 75 Hz 
1280 x 1024 @ 60, 75 Hz 
1024 x768 @ 60, 70, 72, 75 Hz 
800 x 600 @ 56, 60, 72, 75 Hz 
640 x 480 @ 60, 75 Hz 
720 x 400 @ 70 Hz 
Power  Voltage  100V~240 VAC, 50/60Hz (auto switch) 1.2A 
Display area  Full Scan 408.24mm(H) x 255.15mm(V) 
16.07”(H) x 10.04”(V) 
Operating 
conditions Temperature 
Humidity 
Altitude 32°F to + 104°F( 0°C to + 40°C) 
10%C to + 90%(non-condensing) 
To 10,000 feet 
Storage 
conditions Temperature 
Humidity 
Altitude -4°F to + 104°F( -20°C to + 60°C) 
10%C to + 90%(non-condensing) 
To 40,000 feet 
Weight Physical 10.41b(4.7 kg) 
Regulations   BSMI, CCC, PSB, C-Tick, VCC1,   
CE, GS, Ergo, Gost-R/Hygienc, SASO, TCO’03, 
UL/cUL, FCC-B, ICES-B, TUV-S, ENERGY STAR® 
Power saving 
modes On 
Off Normal    (green LED) 

						

							 
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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 n n e c t i o n  
12 (SDA) 
13  Horizontal sync (Composite sync) 
14 Vertical sync 
15 (SCL)  
						

							 
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ViewSonic Corporation              
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3.   Front Panel Function Controls And Indicators  
 
 
  
						

							 
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ViewSonic Corporation              
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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, press button [2]. A control screen like the one 
shown below appears.   
 
The line at the bottom of the screen shows the 
current functions of buttons 1 and 2: Exit or 
select the Brightness control.   
 
 
4. To adjust the control, press the up ▲ or▼ down T buttons.   
5. To save the adjustments and exit the menu, press button [1] twice.  
 
The following tips may help you optimize your display:  
• Adjust the computers graphics card so that it outputs a 1024 x 768 @ 60Hz video 
signal to the LCD display. (Look for instructions on “changing the refresh rate” in the 
graphics cards user guide.)   
• If necessary, make small adjustments using H. POSITION and V. POSITION until the 
screen image is completely visible
. (The black border around the edge of the screen 
should barely touch the illuminated “active area” of the LCD display.)