ViewSonic Va703b3 Service Manual

							
 
 
ViewSonic VA703b-3  VA703m-3 
Model No. VS11359 
17” Color TFT LCD  Display 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(VA703b-3_VA703m-3_SM Rev. 1C Dec. 2006) 
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583 
Service Manual  
						

							
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ViewSonic Corporation
  Confidential - Do Not Copy  VA703b-3_VA703m-3 
Copyright 
Copyright © 2007 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, 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 
Optiquest is a registered trademar k of ViewSonic Corporation. 
ViewSonic is a registered trademar k of ViewSonic Corporation. 
All other trademarks used within this document ar e the property of their respective owners. 
 
 
 
Revision History 
Revision  SM Editing Date  ECR Number  Description of Changes  Editor 
1a  8/23/2006      Initial Release  Jamie Chang 
     
    
 
       
       
       
       
 
1b                   10/23/2006              VS-E060300           Add 2nd panel CPT CLAA170EA07Q (8ms)           Jamie Chang 
     
1c                   12/21/2006              VS-E060414            Phase in INL MT170EN01 V9 (5ms) panel
 
as backup (updated RSPL / BOM)                           Jamie Chang  
						

							
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ViewSonic Corporation
  Confidential - Do Not Copy  VA703b-3_VA703m-3 
TABLE OF CONTENTS 
 
 
1.  Precautions and Safety Notices    1
2. Specification   4
3.  Front Panel Function Control Description  10
4. Circuit Description  15
5. Adjustment Procedure  24
6.  Troubleshooting Flow Chart  37
7.  Recommended Spare Parts List 45
8. Exploded Diagram and Exploded Parts List  49
9. Block Diagram  54
10. Schematic Diagrams 55
11.  PCB Layout Diagrams 62
 
  
						

							
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ViewSonic Corporation
  Confidential - Do Not Copy  VA703b-3_VA703m-3 
1. Precautions and Safety Notices 
 
1. SAFETY PRECAUTIONS 
This monitor is manufactured and tested on a ground principl e that a user’s safety comes first. However, improper 
used or installation may cause damage to  the monitor as well as to the user. 
 
WARNINGS: 
z   This monitor should be operated only at the correct power  sources indicated on the label on the rear of the monitor. If 
you’re unsure of the power supply in you residen ce, consult your local dealer or Power Company. 
z   Use only the special power adapter that comes with this monitor for power input. 
z   Do not try to repair the monitor by yourself, as it contai ns no user-serviceable parts. Only the qualified technician can 
repair it.   
z   Do not remove the monitor cabinet. There are high-volt age parts inside that may cause electric shock to human 
bodies. 
z   Stop using the monitor if the cabinet is damaged. Have it checked by a service technician. 
z   Put your monitor only in a lean, cool, dry environment. If  it gets wet, unplug the power cable immediately and consult 
your closed dealer. 
z   Always unplug the monitor before cleaning it. Clean the ca binet with a clean, dry cloth. Apply non-ammonia based 
cleaner onto the cloth, not di rectly onto the glass screen. 
z   Do not place heavy objects on the monitor or power cord. 
     
2. PRODUCT SAFETY NOTICE 
Many electrical and mechanical parts in this chassis ha ve special safety visual inspections and the protection 
afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, 
etc. Before replacing any of these components read the part s list in this manual carefully. The use of substitute 
replacement parts, which do not have the same safety charac teristics as specified in the parts list, may create shock, 
fire, or other hazards. 
 
3. SERVICE NOTES 
z   When replacing parts or circuit boards, clamp  the lead wires around terminals before soldering. 
z   Keep wires away from high voltage, high  temperature components and sharp edges. 
z   Keep wires in their original position so as to reduce interference. 
z   Adjustment of this product pl ease refers to the user’ manual.  
						

							
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4. Handling and Placing Methods 
 
Correct Methods: Incorrect Methods: 
Only touch the metal of th e LCD panel or the front 
cover of he 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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Correct Methods: Incorrect Methods: 
Place the monitor on a clean and soft foam pad.  Placing the monitor on fo
reign objects, That could 
scratch the surface of the  panel or cause Mura. 
  
The panel is placed facedown on the lap. That may 
cause Mura. 
 
  
						

							
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2. Specification 
PRODUCT DEFINITION AND SPECIFICATION 
Product Name  VA703b-3 / VA703m-3 
Model Number  VS11359 
Region M model for America 
E model for Europe 
G model for China 
P model for Asia 
A model for Australia 
S model for Singapore 
K model for Korea 
U model for UK 
OSD Languages 
English, French, German, Italian, Spanish,  
Finnish, Japanese, Traditional Chinese, 
Simplified Chinese 
TFT LCD Panel and Model # 
INN, Model # :MT170EN01 V7 
TFT LCD Panel and Model # CPT Model # :CLAA170EA07Q 
TFT LCD Panel and Model #  INN, Model # :MT170EN01 V9 
Scalar  MST TSUM16AL 
Input Signal  Analog 
Sync Compatibility Separate  
 Audio 
1 W @ < 8 % distortion ( for VA703m-3 only )
Adapter  
No 
Power Cable  Refer to Appendix D 
Analog Cable (1.8 m, color : black), with PC 
2001 and Hot Plug Detect &DDC
  Yes
 
Audio Cable (1.8m, Color: black) with PC 
2001
  Yes 
( for VA703m-3 only ) 
ViewSonic CD Wizard 
ViewSonic  Quick Start Guide  Arabic, English, Finnish, Spanish, German,  
Italian, Swedish, Polish, Korean, Portuguese, 
Russian, French, Simplified Chinese, 
Traditional Chinese, Hungary, Czech, 
Turkish
Screen Protector Mylar 
Yes 
Hi Pot label 
Yes 
QA pass label 
Yes 
Hg Warnning label 
Yes 
Warranty Sticker  For G model only 
Warranty Card For G model only 
Carton Sticker  For G model only 
PE bag of Carton 
For G model only 
  
						

							
 
ViewSonic Corporation
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4 
1 GENERAL specification 
Test Resolution & Frequency  1280 x 1024 @ 60Hz 
Test Image Size  Full Size 
Contrast and Brightness Controls  Factory Default:   
Contrast = 70%, Brightness = 100% 
 
2 VIDEO INTERFACE
 
Analog Input Connector  DB-15 (Analog), refer the appendix A 
Default Input Connector  Defaults to the first detected input 
Video Cable Strain Relief  Equal to twice the weight of the monitor for five 
minutes 
Video Cable Connector DB-15 Pin out  Compliant DDC 1/2B 
Video Signals 
1. Video RGB (Analog), Separate 
Video Impedance  75 Ohms (Analog) 
Maximum PC Video Signal 950 mV with no damage to monitor 
Maximum Mac Video Signal  1250 mV with no damage to monitor 
Sync Signals LVDS 
DDC 1/2B Compliant with Revision 1.3 
Sync Compatibility  Separate Sync 
Video Compatibility  Shall be compatible with all PC type computers, 
Macintosh computers, and after market  video cards
Resolution Compatibility 640 x 350, 640 x 480, 720 x 400 (640 x 400), 800 x 
600, 832 x 624, 1024 x 768, 1152 x 864, 1280 x 
1024 
Exclusions 
Not compatible with interlaced video 
 
3 POWER SUPPLY 
Internal Power Supply 
Part Number: ILPI-020 
Input Voltage Range 
90 TO 264 VAC 
Input Frequency Range 
47.5 TO 63 HERTZ 
Short Circuit Protection  Output can be shorted without damage 
Over Current Protection 
5 A typical at  14 VDC 
Leakage Current 
3.5 mA (Max) at 254VAC / 60Hz 
Efficiency 
80 % typical at 115VAC Full Load 
Fuse  Internal and not user replaceable 
Power Dissipation 
35 Watts (max) 
Max Input AC Current 1.2 Arms @ 100VAC,  0.6 Arms @240VAC 
Inrush Current (Cold Start) 
40 A @ 120 VAC, 60 A(max) @ 220 VAC 
Power Supply Cold Start  Shall start and function properly when under full 
load, with all combinations of input voltage, input 
frequency, and operating temperature 
Power Supply Transient Immunity Shall be able to withstand an ANSI/IEEE C62.41-
1980 6000V 200 ampere ring wave transient test 
with no damage 
Power Supply Line Surge Immunity 
Shall be able to withstand 1.5 times nominal line 
voltage for one cycle with no damage 
Power Supply Missing Cycle Immunity  Shall be able to function properly, without reset or 
visible screen artifacts, when ½ cycle of AC power is 
randomly missing at nominal input 
Power Supply Acoustics The power supply shall not produce audible noise 
that would be detectable by 
the user.  Audible shall 
define to be in compliance with ISO 7779 (DIN 
EN27779:1991) Noise measurements of machines 
acoustics. Power Switch noise shall not be 
considered 
US Type Power Cable   Length = 1.8m. Connects to AC/DC Power Color = 
Black 
Power Saving Operation(Method) 
VESA DPMS Signaling 
Power Consumption   ON Mode < 
35 W (max)  
POWER SAVING <  2W ,OFF < 1W  
Recovery Time  On Mode = N/A, Active Off < 3 sec  
						

							
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5 ELECTRICAL REQUIREMENT 
 
 
Horizontal / Vertical Frequency 
Horizontal Frequency  30 – 82 KHZ  
Vertical Refresh Rate  50 – 85 HZ. 
Maximum Pixel Clock 
135 MHz 
Sync Polarity  Independent of sync polarity. 
 
Timing Table 
Item Timing  Analog 
1  640 x 350 @ 70Hz, 31.5kHz 
Yes 
2  640 x 400 @ 70Hz 
Yes 
3  640 x 480 @ 50Hz Yes 
4  640 x 480 @ 60Hz, 31.5kHz 
Yes 
5  640 x 480 @ 67Hz, 35.0kHz 
Yes 
6  640 x 480 @ 72Hz, 37.9kHz 
Yes 
7  640 x 480 @ 75Hz, 37.5kHz 
Yes 
8  640 x 480 @ 85Hz, 43.27kHz 
Yes*3 
9  720 x 400 @ 70Hz, 31.5kHz 
Yes 
10  800 x 600 @ 56Hz, 35.1kHz 
Yes 
11  800 x 600 @ 60Hz, 37.9kHz 
Yes 
12  800 x 600 @ 72Hz, 48.1kHz 
Yes 
13  800 x 600 @ 75Hz, 46.9kHz 
Yes 
14  800 x 600 @ 85Hz, 53.7kHz 
Yes*3 
15  832 x 624 @ 75Hz, 49.7kHz 
Yes 
16  1024 x 768 @ 60Hz, 48.4kHz 
Yes 
17  1024 x 768 @ 70Hz, 56.5kHz 
Yes 
18  1024 x 768 @ 72Hz, 58.1kHz 
Yes 
19  1024 x 768 @ 75Hz, 60.0kHz 
Yes 
20  1024 x 768 @ 85Hz 
Yes*3 
21  1152 x 864 @ 75Hz 
Yes 
22  1152 x 870 @ 75Hz 
Yes 
23  1280 x 960 @ 60Hz 
Yes 
24  1280 x 960 @75Hz 
Yes 
25  1280 x 1024 @ 60Hz 
Yes 
26  1280 x 1024 @ 75Hz 
Yes 
*1. Tolerance  ≧ ± 2kHz. 
*2. Any timing not in the list, it should display as nor mal or show on “OUT OF RANGE” OSD message without 
blanking. 
*3. The image quality of 85Hz mode might be worse than 75Hz.  
						

							
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6  FRONT PANEL CONTROLS AND INDICATORS 
Front Panel Hardware Controls 
Power Switch (Front Head)  Power Control, soft Power Switch. 
Power LED (Front Head)  Green – ON 
Orange – Active Off 
Dark = Soft Power Switch OFF 
Front Panel Controls (Head) 
[ 1 ] [ 2 ] [
] [
▲ ] [▼ ]  [ 1 ] BUTTON 1   
[ 2 ] Button 2 
[
] Power 
[ ▲ ] UP ARROW BUTTON 
[ ▼ ] DOWN ARROW BUTTON 
 
Note: Power Button, Button 1 and Button 2 must be 
one-shot logic operation. (i.e. there should be no 
cycling) 
Reaction Time  OSD must fully appear within 0.5s after pushing Button 
1 
 
Short Cuts Function from the button(s) 
[1] Main 
Menu 
[2] Auto Image Adjust 
[]  Power Control, soft Power Switch 
[▼ ] or [ ▲]  To immediately activate Contrast menu. It should be change to 
Brightness OSD by push button [2] 
[ ▼ ]+ [▲ ]  Recall both of Contrast and Brightness to default 
[1] + [2]  Toggle 720x400 and 640x400 mode when input 720x400 or 
640x400 mode 
[1] + [▼ ] + [▲]    White Balance. (Not shown on user’s guide) 
[1] + [▼ ] Power  Lock 
[1] + [▲] OSD  Lock 
[▼ ] + [▲ ]+ []  Enter Factory Mode 
Remark : All the short cuts function are only available while OSD off 
 
 
Main Menu Controls 
Auto Image Adjust 
Contrast/Brightness*
1 
Audio Adjust  ( for VA703m-3 only ) 
Vo l u m e *3, Mute*3 
Color Adjust   
SRGB, 9300K, 6500K(default), 5400, User Color [R, G, B] 
     Information    [H Frequency, V Frequency, Pixel Clock, Resolution, Model Number,       
                             Serial Number, “www.ViewSonic.com
” ] 
Manual Image Adjust [H. Size, H./V. Position, Fine Tune,  Sharpness*2 
Setup Menu   
 
Language [English, French, German, Italian, Spanish, Finnish, Simplified Chinese 
Traditional Chinese, Japanese],   
Resolution Notice, OSD Position*
1, OSD Timeout, OSD Background 
Memory Recall 
 
*1 These functions can be recalled to default by [ ▼]+ [ ▲] 
*2  These functions are not available under Native Resolution Mode 
*3  These functions setting can be recalled to default by [ ▼]+[▲ ] under audio mode 
 
[Remark] Please refer to the detail in the Appendix C