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, 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 12/14/2006    Initial Release Jamie Chang 
     
     
     
     
     
     
 
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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
 
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1. Precautions and Safety Notices 
 
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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 switch the LCD display 
off. 
(6)  Do not touch the LCD panel su rface with sharp or hard objects. 
(7)  Do not place heavy objects on the LCD  display, video cable, or power cord. 
(8)  Do not use abrasive cleaners, wa xes or solvents for your cleaning. 
(9)  Do not operate the produc t under the following conditions: 
- Extremely hot, cold or humid environment. 
- Areas susceptible to excessive dust and dirt. 
- Near any appliance generating a strong magnetic field. 
- Place in direct sunlight. 
 
2. Caution  No modification of any circuit should be attempted. Service work should  only be performed after 
you are thoroughly familiar with all of the fo llowing safety checks and servicing guidelines. 
 
3. Safety Check  Care should be taken while servicing this LCD disp lay. Because of the high voltage used in the 
inverter circuit, the voltage is exposed in such  areas as the associated transformer circuits. 
 
4.  Power Supply Requirements  The external AC power operating range shall be from 90 to 264Vac 
 
5.  LCD Module Handling Precautions  5.1. Handling Precautions  
(1)  Since front polarizer is easily damaged, pay attention not to scratch it. 
(2)  Be sure to turn off power supply when inserting or disconnecting from input connector. 
(3)  Wipe off water drop immediately. Long contact with water may cause discoloration or 
spots. 
(4)  When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth. 
(5)  Since the panel is made of glass, it may break or crack if dropped or bumped on hard  surface. 
(6)  Since CMOS LSI is used in this module, take care of static electricity and insure human  earth when handling. 
(7)  Do not open nor modify the Module Assembly. 
(8)  Do not press the reflector sheet at the back of the module to any directions. 
(9)  In case if a Module has to be put back into the packing container slot after once it was  taken out from the container, do not press the center of the CCFL Reflector edge. 
Instead, press at the far ends of the CF L Reflector edge softly. Otherwise the TFT 
Module may be damaged. 
(10)  At the insertion or removal of the Signal  Interface Connector, be sure not to rotate nor 
tilt the Interface Connector of the TFT Module. 
(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for  example), do not twist nor bend the TFT Module even momentary. At designing the 
enclosure, it should be taken into consideration that no bending/twisting forces are 
applied to the TFT Module from outside. Otherwise the TFT Module may be damaged. 
(12) Cold cathode fluorescent lamp in LCD contains a small amount of mercury. Please  follow local ordinances or regulations for disposal. 
(13)  Small amount of ma terials having no flammability gr ade is used in the LCD module. 
The LCD module should be supplied by power complied with requirements of Limited 
Power Source (IEC60950 or UL1950), or be applied exemption. 
(14) The LCD module is designed so that the CFL in it is supplied by Limited Current 
 
Circuit (IEC60950 or UL1950). Do  not connect the CFL in Hazardous Voltage Circuit. 
  
						

							
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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 the surface of the panel or cause “Mura” 
 
 
 
 
 
 
 
 
 
 
 
  
The panel is placed facedown on the lap. That may 
cause  “Mura”  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
						

							
2. Specification 
 
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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 Degrees (Min) 
Horizontal = 170 Degrees (Typ), Vertical = 160 Degrees (Min) 
 
900:1 (Typ), 700:1 (Min)  
300 cd/m2 (Typ), 250 cd/m2 (Min), 
 
Tr = 3.6ms (Typ), Tf =1.4ms (Typ). Tr+Tf = Total =  5ms (Typ)   
Tr = 5.7ms (Max), Tf = 2.3ms (Max) Tr+Tf = Total = 8ms (Max) 
 
 
16.7 million colors (6 bits + HiFRC) 
40,000 Hrs (Min) 
2. INPUT SIGNAL  Video 
Sync   RGB Analog (75 ohms, 0.7 Vp-p) 
H/V Separated (TTL), Composite, SOG 
F
H:30~82kHz, FV:50~85Hz 
 
3. COMPATIBILITY  PC   
Mac   VGA up to 1680 x 1050 non-interlaced 
 
Power Macintosh up to 1680 x 1050 
 
4. RESOLUTION  Max   
   1680 x 1050 @ 60 Hz NI 
1600 x 1200 @ 60 Hz NI 
1440 x 900 @ 60, 75 Hz NI 
1400 x 1050 @ 60, 75 Hz NI 
1280 x 1024 @ 60, 75,85 Hz NI 
1024 x768 @ 60, 75,85 Hz NI 
800 x 600 @ 60, 75 ,85Hz NI 
640 x 480 @ 60, 75 , 85 Hz NI 
5. CONNECTOR  Signal   
 
 
Power Head 
 
 
 
Head 15 pin mini D-sub 
Audio in stereo Jack 
 
 
3 Pin AC Plug, (CEE22)  
6. POWER  Voltage 
Consumption AC/DC 
Internal 
Power  AC 100 – 240 VAC 50-60 Hz (auto switch) 
48W (Typ) 
 
7. SPEAKER  Stereo 
  2.5w x2 ,  
 
8. ERGONOMICS  Tilt    Down 
Up 5 Degrees 
20 Degrees 
9. CONTROLS  Physical 
 
OSD LCD 
Head 
 
Main 
Menu 
 
 
 
 
 
 
 
 
 
  [1], [2] , Power (Soft) ,  Down[
▼], Up[▲ ] 
 
Auto Image Adjust*
1  
Contrast/Brightness*2*4 
Audio Adjust  
        Volume*
4, Mute*4 
Color Adjust  
        SRGB, 9300K,7500K, 6500K(default), 5400k,User Color [R, G, 
B] 
    Information [H Frequency, V Frequency, Resolution, Pixel 
Clock, Serial Number ,    
     Model Number, [“www.ViewSonic.com
” ] 
Manual Image Adjust       Horizontal Size*
1, H/V. Position*1,  Fine Tune*1, Sharpness*3 , 
Opticolor [Standard, Text , Cinema, Game, Portrait, Scenery,  
						

							
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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 
[ ▲ ] + [ ▼]: Recall Contrast and Brightness 
[1] and [▼ ]: Power lock/unlock 
[1] and [▲ ]: OSD lock/unlock 
 
*
1 These functions are not available in Digital Mode 
*2  These functions are not available under SRGB Mode, 
    Opticolor On, and Opticolor Skin Tone On 
*
3  These functions are not available under Native Resolution 
Mode 
*
4  These functions setting can be recalled to default value by 
pressing [ ▼]+[ ▲] 
 
10.  BANDWIDTH  Pixel Clock    Analog 170 Mhz (Max) 
11. DISPLAY AREA     473.76 (H) x 296.1 (V)  
 
12. OPERATING 
CONDITION  Temperature 
Humidity  
32℉-104℉(0℃ -40 ℃) 
20% to 90% (no condensation) 
 
13. STORAGE /  SHIPPING  
CONDITION  Temperature 
Humidity 
  
-4°F to 140°F (-20°C to60°C) ° 
10% to 90% (no condensation)  
14. DIMENSIONS  Physical   
 
Panel Only 
 
 
Packaging 
  
 
 
W/o 
base 
 
 
 528 mm (W) x 483 mm (H) x 244 mm (D) 
20.8” (W) x 19” (H) x9.6” (D) 
 
524 mm (W) x 483 mm (H) x 65 mm (D) 
20.6” (W) x 19” (H) x2.6” (D) 
 
575 mm (W) x  172 mm (H) x 535 
mm (D) ; Horizontal-Flat type 
22.6  (W) x 6.8  (H)  x 21.1  (D) 
15. WEIGHT  Net 
Net
(w/o stand)
Gross   6.8 Kg (15 lbs)  
5.8 Kg (12.8 lbs)  
9.2 Kg (20.3 lbs) 
16.  REGULATIONS      Global: CB, MPR II, WEEE,ROHS , ISO13406-2 
VSA:UL, cUL, FCC-B, TUV-S, NOM, Energy Star 
VSE:TUV/ERGO,CE ,GOST-R+Hygienic ,SASO , ENERGY 
VSI: BSMI, CCC, PSB, C-TICK,  MIC 
VSCN:CCC 
17. RELIABILITY  MTBF     100,000hrs (demonstrated) excluding Light source 
Light Source MTBF: 40K hrs (Min) 
18. POWER SAVING FUNCTION  On 
Sleep 
Off Green 
Amber 
 Normal 

						

							

 
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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. ---------- Weight =1.3 Kg/box 
2. Weight and materials of the poly foam ------ Weight = 217 g/piece, 2 pieces per box, 
Material = EPS 
3. Weight and material of the empty accessory plastic bags --------- Weight = 4g/bag, 
Material= PE 
4. Weight and material of the plastic handle ------- Weight = 10g/piece, Material=PE 
Plastic 
5. Weight and material of the PE bag that covers the monitor -------- Weight = 35g/bag, 
Material=PE 
6. Weight / Material of Pallets:  
 (a) A/E/M/U model -Weight =15.1kg, Material= Solid Wood (Fumigation)  
 (b) S/G/J//K/P model-Weight=15.1kg, Material= Poly wood 
   
						

							
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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 
640x400@60Hz and 
640x480@60Hz by [1]+[2] short 
cut key 
(primary=640x480@60Hz) 
3 
640 x 400  @ 70 Hz,  31.5 KHz
　 　 　 　For Analog sync, OSD will be 
640x400@70Hz/720x400@70Hz
. 
(Promary=720x400@70Hz) 
4 
640 x 480  @ 50 Hz,  24.7 KHz
　 　 　 　 
5 640 x 480  @ 60 Hz,  31.5 KHz
　 　 　 　For SOG sync, switch 
640x400@60Hz and 
640x480@60Hz by [1]+[2] short 
cut key 
(primary=640x480@60Hz) 
6 
640 x 480  @ 67 Hz,  35 KHz
　 　 　 　 
7 640 x 480  @ 72 Hz,  37.9 KHz
　 　 　 　 
8 640 x 480  @ 75 Hz,  37.5 KHz
　 　 　 　 
9 640 x 480  @ 85 Hz,  43.3 KHz
　 　 　 　 
10 720 x 400  @ 70 Hz,  31.5 KHz
　 　 　 　For Analog sync, OSD will be 
640x400@70Hz/720x400@70Hz
. 
(Promary=720x400@70Hz) 
11 
720 x 480  @ 60 Hz,  31.5 KHz
   　 
12  720 x 576  @ 50 Hz,  31.3 KHz
   　 
13  800 x 600  @ 50 Hz,  24.7 KHz
　 　 　 　 
14 800 x 600  @ 56 Hz,  35.1 KHz
　 　 　 　 
15 800 x 600  @ 60 Hz,  37.9 KHz
　 　 　 　 
16 800 x 600  @ 70 Hz,  43 KHz
　 　 　 　 
17 800 x 600  @ 72 Hz,  48.1 KHz
　 　 　 　 
18 800 x 600  @ 75 Hz,  46.9 KHz
　 　 　 　 
19 800 x 600  @ 85 Hz,  53.7 KHz
　 　 　 　 
20 832 x 624  @ 75 Hz,  49.7 KHz
　 　 　 　 
21 1024 x 768  @ 50 Hz,  39.6 KHz
　 　 　 　For SOG sync, the Information 
OSD will be 1024x768@50Hz, 
the OSD content also can be 
chan
ged to 1280x768@50Hz by  
						

							
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  [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 1280x768@75Hz by 
[1]+[2] short cut key. 
26 
1024 x 768  @ 85 Hz,  68.7 KHz
　 　 　 　 
27 1152 x 864  @ 75 Hz,  67.5 KHz
　 　 　 　 
28 1152 x 870  @ 75 Hz,  68.7 KHz
　 　 　 　 
29 1280 x 720  @ 50 Hz,  37.5 KHz
   　 　 
30 1280 x 720  @ 60 Hz,  45 KHz
   　 　 
31 1280 x 768  @ 50 Hz,  39.6 KHz
　 　 　 　For SOG sync, the Information 
OSD will be 1024x768@50Hz, 
the OSD content also can be 
changed to 1280x768@50Hz by 
[1]+[2] short cut key. 
32 1280 x 768  @ 60 Hz,  47.8 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. 
33 1280 x 768  @ 75 Hz,  60.3 KHz
　 　 　 　For SOG sync, the Information 
OSD will be 1024x768@75Hz, 
the OSD content also can be 
changed to 1280x768@75Hz by 
[1]+[2] short cut key. 
34 
1280 x 960  @ 50 Hz,  49.4 KHz
　 　 　 　 
35 1280 x 960  @ 60 Hz,  59.7 KHz
　 　 　 　 
36 1280 x 960  @ 75 Hz,  75.2 KHz
　 　 　 　 
37 1280 x 1024  @ 60 Hz,  64 KHz
　 　 　 　 
38 1280 x 1024  @ 75 Hz,  80 KHz
　 　 　 　 
39 1400 x 1050  @ 60 Hz,  65.3 KHz
　 　 　  
40  1440 x 900  @ 60 Hz,  55.5 KHz
　 　 　 　 
41 1440 x 900  @ 75 Hz,  75 KHz
　 　 　 　 
42 1600 x 1200  @ 60 Hz,  75 KHz
　 　 　 　 
43 1680 x 1050  @ 60 Hz,  64.7 KHz
　 　 　 For Analog sync, switch 
1680x1050@60Hz and 
1400x1050@60Hz by [1]+[2] 
short cut key 
(primary=1680x1050@60Hz) 
 
*1. Tolerance 
≥ ±2KHz. 
*2. Any timing not in the list, it should display as normal or show on “OUT OF RANGE” OSD 
message without blanking. 
*3. The image quality of 85Hz mode might be worse than 75Hz.