ViewSonic Vx2235wm 5 Service Manual

 
 
ViewSonic VX2235wm-1 
Model No. VS11349 
22” Color TFT LCD  Display 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(VX2235wm-1_SM Rev. 1a Aug. 2006) 
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583 
Service Manual  

ViewSonic Corporation Confidential - Do Not Copy    VX2235wm-1 
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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...

ViewSonic Corporation Confidential - Do Not Copy    VX2235wm-1 
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TABLE OF CONTENTS 
 
 
1.  Precautions and Safety Notices    1
2. Specification   3
3.  Front Panel Function Control Description  13
4. Circuit Description  19
5. Adjustment Procedure  20
6.  Troubleshooting Flow Chart 54
7. Recommended Spare Parts List 62
8.  Exploded Diagram and Exploded Parts List  64
9. Block Diagram 67
10. Schematic Diagrams 68
11.  PCB Layout Diagrams  74
 
  

ViewSonic Corporation Confidential - Do Not Copy    VX2235wm-1 
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1. Precautions and Safety Notices 
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)  Use only a high quality, safety approved AC/DC power cord.   
(5) Disconnect the power plug from the AC outlet if the product will not be used for a long period of time....

ViewSonic Corporation Confidential - Do Not Copy    VX2235wm-1 
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Correct methods :  Incorrect Methods : 
Only touch the metal-frame of the panel or the front 
cover of the monitor. 
Do not touch the surface of the polarizer .  Surface of the panel is pressed by fingers & this may 
cause “ MURA “ 
  
  Take out the monitor with cushion  Take out the monitor by grasping the LCD panel.  That may cause “ MURA“. 
  
Place the monitor on a clean & soft foam pad .  Place the monitor on foreign objects ....

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2. Specification 
2.1 INSTRUCTION   
FEATURES VX2235wm 
Size  22  wide 
Luminance (Typ)  280 cd/
㎡ 
Contrast Ratio (Typ)  700:1 
Colors  16.2 M    (6 bits + 2 bits FRC) 
Response Time    5 ms(on/off) 
Viewing Angle (H/V)  170 ° / 160 ° 
TFTLCD PANEL 
1
st  
 
CMO 
A220Z1 
Recommend resolution  1680x1050@60Hz 
Analog    Yes (75ohms, 0.7/1.0 Vp-p) Input Signal Digital Yes 
Separate Sync    Yes 
Composite Sync  Yes Sync Compatibility 
Sync...

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2.2 GENERAL SPECTION   
 
Test Resolution & Frequency  1680x1050 @ 60Hz 
Test Image Size  Full Size 
Contrast and Brightness Controls  Factory Default:   
Contrast = 70%, Brightness = 100% 
 
2.3 VIDEO INTERFACE 
 
Analog Input Connector  DB-15 (Analog), refer the appendix A 
Digital Input Connector  DVI-D (Digital), refer the appendix B 
Default Input Connector  Defaults to the first detected input 
Video Cable Strain Relief  Equal to...

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2.4 POWER SUPPLY 
 
Internal Power Supply  Part Number: 27-D009542  
Input Voltage Range  AC100~240 (Worldwide) 
Input Frequency Range  50    to 60 Hertz 
Short Circuit Protection  OUTPUT CAN BE SHORTED WITHOUT DAMAGE 
Over Current Protection  3.3~4.5A    typical at 5 VDC ( PROTECT WHEN SHORT CIRCUIT ) 
Leakage Current  3.5MA (MAX) AT 264VAC / 50HZ 
Efficiency  80 % TYPICAL AT 115VAC FULL LOAD 
Fuse  INTERNAL AND NOT USER REPLACEABLE...

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2.5 ELECTRICAL REQUIREMENT 
Horizontal / Vertical Frequency 
Horizontal Frequency  24 – 82 kHz   
Vertical Refresh Rate 50 – 85* Hz 
Maximum Pixel Clock  150 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 Analog sync, the image vertical size image 
will be not full screen (Still 
at the...

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10  640 x 480  @  75  Hz,  37.5  KHz  　　 　　  
11  640 x 480  @  85  Hz,  43.3  KHz  　　 　　  
12  720 x 400  @  70  Hz,  31.5  KHz  　　 　　For Analog sync, the image vertical size image 
will be not full screen (Still 
at the center), And the 
OSD will be 640x350/640x400/720x400 
(primary= 720x400). 
13  720 x 400  @  85  Hz,  37.9  KHz  　　 　　For Analog sync, the image vertical size image 
will be not full screen (Still 
at the center), And...