ViewSonic LCD Display VS11349 Manuale utente

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

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

ViewSonic Corporation Confidential - Do Not Copy VX2235wm-1

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

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

ViewSonic Corporation Confidential - Do Not Copy VX2235wm-1

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

ViewSonic Corporation Confidential - Do Not Copy VX2235wm-1

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

ViewSonic Corporation Confidential - Do Not Copy VX2235wm-1

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

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