ViewSonic LCD Display VS11349 User 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- [phone]
Service Manual

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Copyright
Copyright © 2006 by ViewSonic Corporation. All rights reserved. No part of this publication
may be reproduced, transmitted, transcribed, 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 otherwise, 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 trademark of ViewSonic Corporation.
ViewSonic is a registered trademark of ViewSonic Corporation.
All other trademarks used within this document are the property of their respective owners.
Revision History
Revision SM Editing Date ECR Number Description of Changes Editor
1a 8/14/2006 Initial Release J. Chang

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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

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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.
(6) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display off.
(7) Do not touch the LCD panel surface with sharp or hard objects.
(8) Do not place heavy objects on the LCD display, video cable, or power cord.
(9) Do not use abrasive cleaners, waxes or solvents for your cleaning.
(10) Do not operate the product under the following conditions:
-Extremely hot, cold or humid environment.
-Areas containing excessive dust and dirt.
-Near any appliance generating a strong magnetic field.
-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 following safety checks and servicing guidelines.
3. Safety Check
Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit, the voltage is
exposed in such areas as the associated transformer circuits.
4. LCD Module Handling Precautions
4.1 Handling Precautions
(1) Since front polarizer is easily damaged, pay attention not to scratch it.
(2) Be sure to turn off power supply when connecting or disconnecting input connector.
(3) Wipe off water drops 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 ensure human earth when handling.
(7) Do not open or modify the Module Assembly.
(8) Do not press the reflector sheet at the back of the module in any direction.
(9) In the event that a Module must be put back into the packing container slot after it was taken out of the container, do
not press the center of the CCFL Reflector edge. Instead, press at the far ends of the CFL 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 or 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 or bend the
TFT Module even momentarily. When designing the enclosure, it should be taken into consideration that no
bending/twisting forces may be applied to the TFT Module from outside. Otherwise the TFT Module may be
damaged.
(12) The cold cathode fluorescent lamp in the LCD contains a small amount of mercury. Please follow local ordinances or
regulations for disposal.
(13) The LCD module contains a small amount of materials having no flammability grade. The LCD module should be
supplied with power that complies with the requirements of Limited Power Source (IEC60950 or UL1950), or an
exemption should be applied for.
(14) The LCD module is designed so that the CCFL in it is supplied by a Limited Current Circuit (IEC60950 or
UL1950). Do not connect the CCFL to a Hazardous Voltage Circuit

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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 .
That could scratch the surface of panel

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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
1st
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 on Green Yes
PC Yes
Power Mac Yes
Compatibility
TV Box (NextVision 6) Yes
Power Voltage AC 100-240V, 50/60Hz Yes
On Mode(Typ) < 48 W
Power Consumption
Off Mode (Max) ≦1 W
Audio 3W / THD 10% (Max) Yes
Tilt ( 20 ° - -5 °) Yes
Swivel No
Pivot No
Ergonomics
Height Adjust No
OSD Control [ 1 ] [ 2 ] [ ][▼] [▲] Yes
Physical (W x H x D) 524 x 482 x 244 mm
Dimension
Package (W x H x D) 575 x 522 x 150 mm
Physical (Net Weight) 6 Kg / 13.2 lbs
Weight
Package (Gross Weight) 7.5 Kg / 16.5 lbs
Temperature (℉/℃) 41℉-95℉/+5℃-+35℃
Operating Condition
Humidity (%) 20 % - 80 %
Temperature (℉/℃) -4℉-131℉/-20℃-55℃
Storage Condition
Humidity (%) 20 % - 85 %
Regulation
Global: CB, MPR II,WEEE,ROHS
VSA:UL, cUL, FCC-B, TUV-S, NOM, Energy Star
VSE:TUV/ERGO(covers ISO13406-2&MPR II),CE, GOST-R+Hygienic ,SASO , ENERGY
VSI: BSMI, CCC, PSB, C-TICK, MIC, Green Mark
VSCN:CCC

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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 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, Composite, and Sync on Green
2. TMDS (Digital)
Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)
Maximum PC Video Signal 950 mV with no damage to monitor
Maximum Mac Video Signal 1250 mV with no damage to monitor
Sync Signals TTL
DDC 1/2B Compliant with Revision 1.3
Sync Compatibility Separate Sync, Composite Sync, SOG
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, 1152 x 870, 1280 x 720, 1280 x 960, 1280 x
1024 , 1400 x 1050 , 1440 x 900 , 1600 x 1200, 1680 x 1050
* The image vertical size might not be full screen.
But the image vertical position should be at the center.
Exclusions Not compatible with interlaced video

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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
Power Dissipation < 48 WATTS (TYP)
Max Input AC Current 1.6A (max)
Inrush Current (Cold Start) 80 A Max./ 240VAC / 50Hz (Cold Start at 25℃,Full Load)
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
Separate 3-prong NEMA 5-15P type plug. Length = 1.8m. Connects
to display.
Color = Black
European Type Power Cable
Schuko CEE7-7 type plug.
Length = 1.8m, Connects to display.
Color = Black
CCC Type Power Cable
Separate 3-prong type plug.
Length = 1.8m. Connects to display.
Color = Black
PSE Type Power Cable
Separate 2-prong NEMA 1-15P type plug. Length = 1.8m. Connects
to display.
Color = Black
Power Saving Operation(Method) VESA DPMS Signaling
Power Consumption
On Mode < 48 W (Typ) / 50 W (Max)
Saving Mode < 2 W@230VAC 50HZ
Off Mode < 1 W @230VAC 50Hz
(DC Power Off; Meet to Energy Star Ver4.0 Tier2)
Recovery Time On Mode = N/A, Active Off < 3 sec

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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 center), And the
OSD will be 640x350/640x400/720x400
(primary= 720x400).
2 640 x 350 @ 85 Hz, 37.9 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).
3 640 x 400 @ 60 Hz, 31.5 KHz
For Analog sync, switch 640x400@60Hz and
640x480@60Hz by [1]+[2] short cut key (primary
= 640x480@60Hz)
4 640 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).
5 640 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 the
OSD will be 640x350/640x400/720x400
(primary= 720x400).
6 640 x 480 @ 50 Hz, 24.7 KHz
7 640 x 480 @ 60 Hz, 31.5 KHz
For Analog sync, switch 640x400@60Hz and
640x480@60Hz by [1]+[2] short cut key (primary
= 640x480@60Hz)
8 640 x 480 @ 67 Hz, 35 KHz
9 640 x 480 @ 72 Hz, 37.9 KHz

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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 the
OSD will be 640x350/640x400/720x400 (primary
= 720x400).
14 720 x 480 @ 60 Hz, 31.5 KHz
For Analog sync, the image vertical size image
will be not full screen (Still at the center),and the
information OSD shows 640x480
15 720 x 576 @ 50 Hz, 31.3 KHz
For Analog sync, the image vertical size image
will be not full screen (Still at the center),and the
information OSD shows 800x600
16 800 x 600 @ 56 Hz, 35.1 KHz
17 800 x 600 @ 60 Hz, 37.9 KHz
18 800 x 600 @ 72 Hz, 48.1 KHz
19 800 x 600 @ 75 Hz, 46.9 KHz
20 800 x 600 @ 85 Hz, 53.7 KHz
21 832 x 624 @ 75 Hz, 49.7 KHz
22 1024 x 768 @ 50 Hz, 39.6 KHz
For Analog sync, Switch 1024x768@50Hz and
1280x768@50Hz by [1]+[2] short cut key
(primary = 1024x768@50Hz)
23 1024 x 768 @ 60 Hz, 48.4 KHz
24 1024 x 768 @ 70 Hz, 56.5 KHz
25 1024 x 768 @ 75 Hz, 60 KHz
26 1024 x 768 @ 75 Hz, 60.2 KHz
27 1024 x 768 @ 85 Hz, 68.7 KHz
28 1152 x 864 @ 75 Hz, 67.5 KHz
29 1152 x 870 @ 75 Hz, 68.7 KHz
30 1280 x 768 @ 50 Hz, 39.6 KHz
For Analog sync, Switch 1024x768@50Hz and
1280x768@50Hz by [1]+[2] short cut key
(primary = 1024x768@50Hz)
31 1280 x 768 @ 60 Hz, 47.4 KHz
32 1280 x 768 @ 60 Hz, 47.8 KHz
33 1280 x 768 @ 75 Hz, 60.3 KHz
For Analog sync, Switch 1024x768@75Hz and
1280x768@75Hz by [1]+[2] short cut key
(primary = 1024x768@75Hz)
34 1280 x 768 @ 85 Hz, 68.6 KHz For Analog sync, Switch 1024x768@85Hz and