ViewSonic Vx2235wm4 Service Manual

 
 
ViewSonic VX2235wm-4 
Model No. VS11446 
22” Color TFT LCD Display 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(VX2235wm-4_SM Rev. 1a Dec. 2006) 
Service Manual 
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583  

Copyright 
Copyright © 2006 by ViewSonic Corporation.    All rights reserved.    No part of this publication 
may be reproduced, transmitted, tran scribed, 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 ot herwise, without the prior written permission of ViewSonic 
Corporation. 
 
Disclaimer 
ViewSonic makes no representations  or warranties, either expressed or implied,...

TABLE OF CONTENTS 
 
 
1.  Precautions and Safety Notices   1
2. Specification  3
3.  Front Panel Function Control Description   8
4. Circuit Description 14
5. Adjustment Procedure 18
6.  Troubleshooting Flow Chart 34
7. Block Diagram 37
8. Schematic Diagrams 38
9.  PCB Layout Diagrams 47
10. Exploded Diagram and Exploded Parts List 52
11.  Recommended Spare Parts List 56
 
 ii 
ViewSonic Corporation   
Confidential - Do Not Copy    VX2235wm-4  

1. Precautions and Safety Notices 
 
 1 
ViewSonic Corporation   
Confidential - Do Not Copy    VX2235wm-4 
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)  Disconnect the power plug from AC outlet if the product is not used for a long period of  time. 
(5)  If smoke, abnormal noise, or strange odor is present, immediately...

 2 
ViewSonic Corporation   
Confidential - Do Not Copy    VX2235wm-4 
5.2.  Handling 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”  
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
  
Place the monitor on a clean and soft foam 
pad. 
Placing the monitor on foreign objects. That could 
scratch...

2. Specification 
 
 3 
ViewSonic Corporation   
Confidential - Do Not Copy    VX2235wm-4 
1. LCD PANEL 
1st  panel source 
  Type: 
Pixel Pitch       
Color Filter 
Glass 
Viewing Angle 
 
 
Contrast Ratio 
Brightness 
 
Response 
Time 
 
 
 
Color Depth 
Backlight Life AUO 
 
 
 
CR > 10
 
 
 
 
 
 
 
 
22” wide Color TFT Active Matrix WSXGA+ LCD.  (M220EW01 V0)
0.282mm (H) x0.282mm(V)  
RGB Vertical Stripe 
Anti-Glare treatment and hard-coating 3H 
Horizontal = 160 Degrees (Min), Vertical = 150...

 4 
ViewSonic Corporation   
Confidential - Do Not Copy    VX2235wm-4 
 
 
 
 
 
 
 
Short 
Cut Vivid ], Opticolor Skin Tone[Nature, reddish ,yellowish] 
Setup Menu  
         Language [English, French, German, Italian, Spanish, 
Finnish, Japanese,  
         Simplified Chinese, Traditional Chinese], Resolution Notice,
OSD Position,  
         OSD Timeout, OSD Background 
Memory Recall   
[1]: Main Menu 
[2]: Input Select 
[ ▼ ]: Brightness/Contrast 
[ ▲ ]: Opticolor 
[2]+ [ ▲]: Opticolor skin tone 
[ ▲...

 
 5 
ViewSonic Corporation   
Confidential - Do Not Copy    VX2235wm-4 
UPC-A Code 
ITF-14  Code 
Serial Format 
Country of 
Origin 0 07 66907 25142 5 
QJQyywwxxxxx 
China 
20.  SECURITY   
  Kennsington lock on the bottom right side 
21.  Wall Mount  VESA    100mm x 100mm 
22. ACCESSORIES      Power Cable 
15 Pin VGA Video Cable 
Audio Cable 
Quick Start Guide  
ViewSonic Wizard CD-ROM w/ 17 Language User Guide 
 
23. EU Packaging Information  1. Weight of the individual (empty) shipping carton....

 6 
ViewSonic Corporation   
Confidential - Do Not Copy    VX2235wm-4 
 
Electrical Requirements 

Horizontal / Vertical Frequency  
Horizontal Frequency  24 – 82 KHZ 
Vertical Refresh Rate 50 – 85 HZ 
Maximum Pixel Clock 165 MHz 
Sync Polarity  Independent of sync polarity 
 
Timing Table 
Analog 
Item 
Timing 
Separated 
Composite  SOG 
Digital - TMDS 
Remark 
1 
640 x 350  @ 70 Hz,  31.5 KHz
　 　 　 　For SOG sync, OSD will be 
720x400@70Hz. 
2 640 x 400  @ 60 Hz,  31.5 KHz
　 　 　 　For SOG sync, switch...

 7 
ViewSonic Corporation   
Confidential - Do Not Copy    VX2235wm-4 
 
  [1]+[2] short cut key. 
22 
1024 x 768  @ 60 Hz,  48.4 KHz
　 　 　 　For SOG sync, the Information 
OSD will be 1024x768@60Hz, 
the OSD content also can be 
changed to 1280x768@60Hz by 
[1]+[2] short cut key. 
23 
1024 x 768  @ 70 Hz,  56.5 KHz
　 　 　 　 
24 1024 x 768  @ 72 Hz,  58.1 KHz
　 　 　 　 
25 1024 x 768  @ 75 Hz,  60 KHz
　 　 　 　For SOG sync, the Information 
OSD will be 1024x768@75Hz, 
the OSD content also can be 
changed to...