ViewSonic VX2235wm-1 Service manual

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

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

TFTLCD PANEL

CMO

A220Z1

Input Signal

Sync Compatibility

Compatibility

Power Voltage AC 100-240V, 50/60Hz Yes

Luminance (Typ)

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 °

Recommend resolution 1680x1050@60Hz

Analog Yes (75ohms, 0.7/1.0 Vp-p)

Digital Yes

Separate Sync Yes

Composite Sync Yes

Sync on Green Yes

PC Yes

Power Mac Yes

TV Box (NextVision 6) Yes

22 " wide

280 cd/㎡

Power Consumption

Audio 3W / THD 10% (Max) Yes

Ergonomics

OSD Control [ 1 ] [ 2 ] [ ][▼] [▲] Yes

Dimension

Weight

Operating Condition

Storage Condition

On Mode(Typ) < 48 W

Off Mode (Max)

Tilt ( 20 ° - -5 °)

Swivel No

Pivot No

Height Adjust No

Physical (W x H x D) 524 x 482 x 244 mm

Package (W x H x D) 575 x 522 x 150 mm

Physical (Net Weight) 6 Kg / 13.2 lbs

Package (Gross Weight) 7.5 Kg / 16.5 lbs

Temperature (℉/℃) 41℉-95℉/+5℃-+35℃

Humidity (%) 20 % - 80 %

Temperature (℉/℃) -4℉-131℉/-20℃-55℃

Humidity (%) 20 % - 85 %

≦1 W

Ye s

Global: CB, MPR II,WEEE,ROHS

VSA:UL, cUL, FCC-B, TUV-S, NOM, Energy Star

Regulation

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

2.3 VIDEO INTERF ACE

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

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

Factory Default:

Contrast = 70%, Brightness = 100%

1. Video RGB (Analog)

Separate, Composite, and Sync on Green

2. TMDS (Digital)

Sync Signals TTL

DDC 1/2B Compliant with Revision 1.3

Sync Compatibility Separate Sync, Composite Sync, SOG

Video Compatibility

Resolution Compatibility

Exclusions Not compatible with interlaced video

Shall be compatible with all PC type computers, Macintosh computers,

and after market video cards

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.

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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./ 240V

/ 50Hz (Cold Start at 25℃,Full Load)

SHALL START AND FUNCTION PROPERLY WHEN UNDER

Power Supply Cold Start

FULL LOAD, WITH ALL COMBINATIONS OF INPUT VOLTAGE, INPUT FREQUENCY, AND OPERATING TEMPERATURE SHALL BE ABLE TO WITHSTAND AN ANSI/IEEE C62.41-1980

Power Supply Transient Immunity

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 Shall be able to function properly, without reset or visible screen

Power Supply Missing Cycle Immunity

artifacts, when ½ cycle of AC power is randomly missing at nominal input The power supply shall not produce audible noise that would be

Power Supply Acoustics

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 Separate 3-prong NEMA 5-15P type plug. Length = 1.8m. Connects

US Type Power Cable

to display. Color = Black Schuko CEE7-7 type plug.

European Type Power Cable

Length = 1.8m, Connects to display. Color = Black Separate 3-prong type plug.

CCC Type Power Cable

Length = 1.8m. Connects to display. Color = Black Separate 2-prong NEMA 1-15P type plug. Length = 1.8m. Connects

PSE Type Power Cable

to display. Color = Black

Power Saving Operation(Method) VESA DPMS Signaling

On Mode < 48 W (Typ) / 50 W (Max)

Power Consumption

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

Vertical Refresh Rate

Maximum Pixel Clock 150 MHz

Sync Polarity Independent of sync polarity.

24 – 82 kHz

50 – 85* Hz

Timing Table

Analog

Composite

Item

Timing

1 640 x 350 @ 70 Hz, 31.5 KHz 　　　　

2 640 x 350 @ 85 Hz, 37.9 KHz 　　　　

3 640 x 400 @ 60 Hz, 31.5 KHz 　　　　

Separated

SOG

Digital - TMDS

Remark

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). 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). For Analog sync, switch 640x400@60Hz and 640x480@60Hz by [1]+[2] short cut key (primary = 640x480@60Hz) For Analog sync, the image vertical size image

4 640 x 400 @ 70 Hz, 31.5 KHz 　　　　

5 640 x 400 @ 85 Hz, 37.9 KHz 　　　　

6 640 x 480 @ 50 Hz, 24.7 KHz 　　　

7 640 x 480 @ 60 Hz, 31.5 KHz 　　　　

8 640 x 480 @ 67 Hz, 35 KHz 　　　　 9 640 x 480 @ 72 Hz, 37.9 KHz 　　　　

For Analog sync, switch 640x400@60Hz and 640x480@60Hz by [1]+[2] short cut key (primary = 640x480@60Hz)

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10 640 x 480 @ 75 Hz, 37.5 KHz 　　　　 11 640 x 480 @ 85 Hz, 43.3 KHz 　　　　

For Analog sync, the image vertical size image

12 720 x 400 @ 70 Hz, 31.5 KHz 　　　　

13 720 x 400 @ 85 Hz, 37.9 KHz 　　　　

14 720 x 480 @ 60 Hz, 31.5 KHz 　　　　

15 720 x 576 @ 50 Hz, 31.3 KHz 　　　　

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 　　　　

will be not full screen (Still at the center), And the OSD will be 640x350/640x400/720x400 (primary= 720x400). 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). For Analog sync, the image vertical size image will be not full screen (Still at the cente r),and the information OSD shows 640x480 For Analog sync, the image vertical size image will be not full screen (Still at the cente r),and the information OSD shows 800x600

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 　　　　

For Analog sync, Switch 1024x768@50Hz and

22 1024 x 768 @ 50 Hz, 39.6 KHz 　　　　

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 　　　　

1280x768@50Hz by [1]+[2] short cut key (primary = 1024x768@50Hz)

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 　　　　

For Analog sync, Switch 1024x768@75Hz and 33 1280 x 768 @ 75 Hz, 60.3 KHz 　　　　

34 1280 x 768 @ 85 Hz, 68.6 KHz 　　　　 For Analog sync, Switch 1024x768@85Hz and

1280x768@75Hz by [1]+[2] short cut key

(primary = 1024x768@75Hz)

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1280x768@85Hz by [1]+[2] short cut key

(primary = 1024x768@85Hz) 35 1280 x 960 @ 50 Hz, 49.4 KHz 　　　　 36 1280 x 960 @ 60 Hz, 59.7 KHz 　　　　 37 1280 x 960 @ 75 Hz, 75.2 KHz 　　　　 38 1280 x 1024 @ 50 Hz, 52.7 KHz 　　　　 39 1280 x 1024 @ 60 Hz, 64 KHz 　　　　 40 1280 x 1024 @ 70 Hz, 74.6 KHz 　　　　 41 1280 x 1024 @ 72 Hz, 76.8 KHz 　 42 1280 x 1024 @ 75 Hz, 80 KHz 　　　　 43 1360 x 768 @ 60 Hz, 47.7 KHz 　　　　 44 1400 x 1050 @ 50 Hz, 54.1 KHz 　　　　 45 1400 x 1050 @ 60 Hz, 64.7 KHz 　　　

For analog sync,, Switch 1400x1050@60Hz and 46 1400 x 1050 @ 60 Hz, 65.3 KHz 　　　

47 1400 x 1050 @ 75 Hz, 82.3 KHz 　　　　 48 1440 x 900 @ 60 Hz, 55.5 KHz 　　　　 49 1440 x 900 @ 60 Hz, 59.9 KHz 　　　　 50 1440 x 900 @ 75 Hz, 75 KHz 　　　　 51 1600 x 1200 @ 60 Hz, 75 KHz 　　　　

52 1680 x 1050 @ 60 Hz, 65.3 KHz 　　　　

*1. Tolerance ≧ ±2KHz. (if the range dose not cover other timing mode)

*2. Any timing not in the list, it should display as normal or show on “OUT OF RANGE” OSD message with blanking.

*3. The image quality of 85Hz mode might be worse than 75Hz.

1680x1050@60Hz by [1]+[2] short cut key

(primary = 1680x1050@60Hz)

For analog sync,, Switch 1400x1050@60Hz and

1680x1050@60Hz by [1]+[2] short cut key

(primary = 1680x1050@60Hz)

Primary Presets

1680x1050 @ 60Hz

User Presets

Number of User Presets (recognized timings) Available: 10 presets total in FIFO configuration

Changing Modes

● Maximum Mode Change Blank Time for image stability : 3 seconds (Max), excluding “Auto Image Adjust” time

● Under DOS mode (640 x 350, 720 x 400 & 640 x 400), it should recall factory setting when execute “Auto Image

Adjust”

● The monitor needs to do “Auto Adjust” the first time when a new mode is detected

(See section “0-Touch™ Function Actions”)

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2.6 FRONT PANEL C ONTROLS AND INDICATORS

Front Panel Hardware Controls

Power Switch (Front Head) Power Control, soft Power Switch.

Power LED (Front Head) Blue – ON

Orange – Active Off

Dark = Soft Power Switch OFF

Front Panel Controls (Head)

[ 1 ] [ 2 ] [

Reaction Time OSD must fully appear within 0.5s after pushing Button 1

] [▼] [▲]

[ 1 ] BUTTON 1

[ 2 ] Button 2

[

] Power

[▼] DOWN ARROW BUTTON

[▲] UP ARROW BUTTON

Note: Power Button, Button 1 and Button 2 must be one-shot logic

operation. (i.e. there should be no cycling)

Short Cuts Function from the button(s)

[1] Main Menu

[2] Input toggle (Analog or Digital)

[▼] To immediately activate Brightness/Contrast menu.

[▼] +[▲] Recall both of Contrast and Brightness to default

[1] + [2] Toggle 720x400 and 640x400 mode when input 720x400 or 640x400 mode

[1] + [▼] + [▲]

(Keep pushing 3 sec)

[1] + [▼] Power Lock

[1] + [▲] OSD Lock

[▲] Essential mode switch

[2] + [▲] Skin tone switch

[▼] +[▲] + [ ] Factory Mode

White Balance. (Not shown on user’s guide)

Standard ->Text -> Cinema -> Game -> Portrait -> Scenery -> Vivid

Nature -> Reddish -> yellowish

Remark : All the short cuts function are only available while OSD off

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Main Menu Controls

Auto Image Adjust*

Contrast/Brightness*

2*4

Input Select

Analog, Digital

Audio Adjust

Volume*

, Mute*4

Color Adjust

SRGB, 9300K,7500K, 6500K(default), 5400,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*

Scenery, Vivid ]

, H/V. Position*1, Fine Tune*1, Sharpness*

Opticolor Skin Tone[Nature, reddish ,yellowish]

3 ,

Opticolor [Standard, Text , Cinema, Game, Portrait,

Setup Menu

Language [English, French, German, Italian, Spanish, Finnish, Japanese, Simplified Chinese, Traditional Chinese],

Resolution Notice, OSD Position, OSD Timeout, OSD Background

Memory Recall

These functions are not available in Digital Mode

These functions are not available under SRGB Mode, Opticolor On, and Opticolor Skin Tone On

These functions are not available under Native Resolution Mode

These functions setting can be recalled to default value by pressing [▼]+[▲]

[Remark] Please refer to the detail in the Appendix C

Function descriptions

OSD Lock short cuts function for the buttons

The OSD lock will be activated by pressing the front panel control buttons "(1), & (▲)" for 10 seconds. If the user then tries to

access the OSD by pressing any of the buttons "1", "▼", "▲", "2" a message will appear on the screen for 3 seconds showing

"OSD Locked". The OSD lock will be deactivated by pressing the front panel control buttons "(1), & (▲)" again for 10

seconds.

Note1: When the OSD is locked will lock all functions, including “Volume” and “Mute”

Note 2: Status bar indicating OSD Lock or Unlock is in progress and when complete it will indicate “OSD Locked”

Note 3: OSD Lock should not lock Power Button and Power Lock function Power Lock short cuts function for the buttons

The power button lock will be activated by pressing the front panel control buttons "(1), & (▼)" for 10 seconds. Locking the

power button means that the user won't be able to turn off the LCD while the power button is locked. If the user presses the

power button while it is locked, a message will appear on the screen for 3 seconds showing "Power Button Locked". It also

means that with the power button locked, the LCD would automatically turn back "On" when power is restored after a power

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failure. If the power button is not in the locked mode, then power should return to it's previous state when power is restored

after a power failure. The power button lock will be deactivated by pressing the front panel control buttons "(1), & (▼)" again

for 10 seconds.

Note 1: Status bar indicating Power Button lock or unlock is in progress and when complete it will indicate “Power Button

Locked”

Note 2: Power should only be lockable in the “On State”

Memory Recall Actions

Memory Recall action on the analog and digital mode as below

1. Set the factory defaults as shown in Section 4-8

2. Clean all the mode setting buffer

3. Execute Auto Image Adjust

Note: Memory Recall should have no effect for Language, Power Lock, User Color Settings or Input Priority

Resolution Notice Ac tions

1. Resolution Notice OSD should show on screen after changing to non-native mode for 30 sec

2. The OSD should disappear after 10 sec or by pushing button [1] or [2] Resolution Notice function should be disabled when push button [2] under Resolution Notice OSD

0-Touch™ Function Actions

1. Execute Auto Image Adjust when new mode detected, and save the settings to buffer for further use

2. It should be reset by Memory Recall function

(Should not reset by power off, power unplug and others) OSD Auto Save The OSD shall save new settings when it is turned off by the user or when it times out. There shall not be a separate save

Input Priority

This function is defined the auto detect priority when the display has several inputs. Please refer to the detail flow chart as the

appendix D

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2.7 AUDIO INTERFACE (SPEAKER SPECIFICATION)

Line input signal 1.0 Vrms @1kHz

Line input impedance 10 kOhm

Maximum Amp power output (Watt)

Amp -THD < 10 % THD @1kHz

Speaker Power rating(Ω/Watt)

Signal to Noise Ratio 72 dB

Frequency response Fo – 20kHz

SPL. 85 ± 3 dB (at 0.5m)

FO 300 Hz

2 W (RL=4Ω)

4Ω/2.5 W (TYP.) ; 4Ω/ 3 W (MAX)

Line input connection

Vibration

Screen image

Connector PC99 requirement Audio in

Cable type / length 3.5mm stereo cable / 1.8m length

Audio DPMS

3.5 mm stereo jacks

There should be no audible vibration resonance at volume=100% &

treble / bass in def. Value

There should be no affect on the screen image stability under any

conditions

Lime Green pantone # 577C

SPEAKERS STAY ON WHEN THE REST OF THE MONITOR IS IN POWER SAVING NOTE: THERE IS NO GUARANTEE <1 W AT POWER CONSUMPTION IN ACTIVE OFF MODE, WHEN THE AUDIO CABLE IS CONNECTED

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3. Front Panel Function Control Description

Adjusting the Screen Image

Use the buttons on the front control panel to display and adjust the OSD controls which display on the screen. The OSD controls are explained at the top of the next page and are defined in “Main Menu Controls” on page 10.

Main Menu

with OSD controls

Front Control Panel

shown below in detail

Displays the control screen for

the highlighted control.

Also toggles between two

controls on some screens.

Also a shortcut to Auto Image

Adjust.

Displays the Main

Menu or exits the

control screen and

saves adjustments.

Standby Power On/Off Power light Blue = ON Orange = Power Saving

Scrolls through menu options and adjusts the displayed control.

Also a shortcut to display the Contrast adjustment control screen (T) / OptiColor (S)

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Do the following to adjust the display setting:

1. To display the Main Menu, press button [1].

NOTE: All OSD menus and adjustment screens disappear automatically after about 15

seconds. This is adjustable through the OSD timeout setting in the setup menu.

2. To select a control to adjust, pressSorTto scroll up or down in the Main Menu.

3. After the desired control is selected, press button [2]. A control screen like the one shown

below appears.

The command line at the bottom of the control screen tells what to do next from this screen. You can toggle between control screens, adjust the selected option, or exit the screen.

4. To adjust the setting, press the up S or down T buttons.

5. To save the adjustments and exit the menu, press button [1] twice.

The following tips may help you optimize your display:

• Adjust the computer's graphics card so that it outputs a 1680 x 1050 @ 60Hz video signal to the LCD display. (Look for instructions on “changing the refresh rate” in the graphics card's user guide.)

• If necessary, make small adjustments using H. POSITION and V. POSITION until the screen image is completely visible

. (The black border around the edge of the screen should

barely touch the illuminated “active area” of the LCD display.)

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Main Menu Controls

Adjust the menu items shown below by using the up S and down T buttons.

Control Explanation

Auto Image Adjust sizes and centers the screen image automatically.

Contrast adjusts the difference between the image background (black level)

and the foreground (white level).

Brightness adjusts background black level of the screen image.

Input Select toggles between inputs if you have more than one computer

connected to the VX2235wm.

Audio Adjust Vol ume increases the volume, decreases the volume, and mutes the audio. Mute temporarily silences audio output.

Color Adjust provides several color adjustment modes, including preset color

temperatures and a User Color mode which allows independent adjustment of red (R), green (G), and blue (B). The factory setting for this product is 6500K (6500 Kelvin).

sRGB-This is quickly becoming the industry standard for color management, with support being included in many of the latest applications. Enabling this setting allows the LCD display to more accurately display colors the way they were originally intended. Enabling the sRGB setting will cause the Contrast and Brightness adjustments to be disabled.

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Control Explanation

9300K-Adds blue to the screen image for cooler white (used in most office

settings with fluorescent lighting).

7500K - Adds blue to the screen image for cooler white (used in most office

settings with fluorescent lighting).

6500K-Adds red to the screen image for warmer white and richer red.

5400K-Adds green to the screen image for a darker color.

User Color Individual adjustments for red (R), green (G), and blue (B).

1. To select color (R, G or B) press button [2].

2. To adjust selected color, pressSandT.

Important: If you select RECALL from the Main Menu when the product is

set to a Preset Timing Mode, colors return to the 6500K factory preset.

Information displays the timing mode (video signal input) coming from the graphics card in the computer, the LCD model number, the serial number, and the ViewSonic® website URL. See your graphics card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency). NOTE: VESA 1680 x 1050 @ 60Hz (recommended) means that the resolution is 1680 x 1050 and the refresh rate is 60 Hertz.

Manual Image Adjust

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Control Explanation

Horizontal Size adjusts the width of the screen image.

H./V. Position (Horizontal/Vertical Position) moves the screen image left or

right and up or down.

Fine Tune sharpens the focus by aligning text and/or graphics with pixel boundaries.

NOTE: Try Auto Image Adjust first.

Sharpness adjusts the clarity and focus of the screen image.

OptiColor Mode provides an optimum display environment depending on the

contents displayed. It contains 7 user-selectable presets. These 7 presets are easily accessible from the short cut keys.

Standard is for general windows environment and monitor default setting.

Tex t optimized for text editing and viewing in a word processing environment.

Cinema optimized for movie and video environment.

Game optimized for PC/TV game environment.

Portrait optimized for displaying indoor portraits and enhancing pictures.

Scenery optimized for displaying outdoor scenery images.

Vivid optimized for color luster and sharpness.

These 7 presets are carefully chosen by Viewsonic, but may not suit all users' tastes. In that case, the user can either return to the Standard setting and manually adjust the brightness and contrast as desired.

OptiColor Skin Tone includes 3 presets (Natural / Red Tone / Yellow Tone) which user can select according to user's preference.

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Control Explanation

Setup Menu displays the menu shown below:

Language Select allows the user to choose the language used in the menus and

control screens.

Resolution Notice allows the user to enable or disable this notice.

If you enable the Resolution Notice shown above and your computer is set at a resolution other than 1680 x 1050, the following screen appears.

OSD Position allows the user to move the OSD menus and control screens.

OSD Timeout sets the length of time the OSD screen is displayed. For example,

with a “30 second” setting, if a control is not pushed within 30 seconds, the display screen disappears.

OSD Background allows the user to turn the OSD background On or Off.

Memory Recall returns the adjustments back to factory settings if the display is

operating in a factory Preset Timing Mode listed in the Specifications of this manual.

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4. Circuit Description

1.RTD 2553V

Realtek RTD2553V series products are all-in-one LCD monitor controllers supporting UXGA / WSXGA+ / WXGA+ / SXGA

(optional), and integrate Realtek high performance ADC, TMDS Rx(optional),scaling engine, OSD engine, LVDS Tx, RSDS

Tx and so on. Moreover, all products are pin compatible in QFP128-pin package to save cost and make the design easier.

2. RTD2120

This chip is the micro-processor of LCD monitor. It uses the design ware DW8051 of Synopsys as the 8051 core of this chip

and is compatible with other industry 8051 series. Also, 96Kbyte FLASH with 8 bit bus is embedded in this chip which is

licensed from TSMC 0.18um e-FLASH process. Here we use the package of PLCC44/LQFP48 if we would like to have a

discrete MCU controller or we make a multi-chip package with our LCD monitor controller to form one chip package to save

the cost of package and PCB material.

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5. Adjustment Procedure

A. Function Test and Alignment Procedu re

1. All Modes Reset You should do “All Model Reset” (Refer to Chap 3. Hot Keys for Function Controls) first. This action will allow you to erase all end-user’s settings and restore the factory defaults.

2. Auto Image Adjust The Auto Adjust is aimed to offer a best screen quality by built-in ASIC. For optimum screen quality, the user has to adjust each function manually .

A.Turn the computer and LCD monitor on.

B. Press the ‘Auto’ button on monitor keypad to Auto Adjust.

C. The LCD monitor will start the Auto Adjust process automatically and run for 10 consecutive seconds, during

which time you will notice the image change.

3. Firmware Test Patten: Burn in Model (Refer to Chap3. Hot Keys for Function Control)

-Make sure the F/W is the latest version.

4. DCC Test Patten: EDID program

-Make sure it can pass test program.

5. Window Shut Down Test Signal: 1280*1024@60Hz Test Pattern:

Checkered Pattern Every One Pixel (50%Green & 50%Blue) Inspection Item: Flicker, Mura

6. Window BG Test Signal: 1280*1024@60Hz Test Pattern:

Window standard pattern Inspection Item: Line Defect, Function Defect & Mura

7. 25 Gray Test Signal: 1280*1024@60Hz

Test Pattern:

Full Screen 25% White (Gray) Inspection Item: Particle, Line Defect & Mura

8. 50 Gray Test Signal: 1280*1024@60Hz Test Pattern:

Full Screen 50% White (Gray) Inspection Item: Bright Dot, Particle, Line Defect & Mura

9. White Box Test Signal: 1280*1024@60Hz Test Pattern:

Window standard pattern Inspection Item: Particle, Line Defect, Power, Image Remain & Mura

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10. Black Box Test Signal: 1280*1024@60Hz Test Pattern:

Window standard pattern Inspection Item: Bright Dot, Line Defect & Power

11. RED Test Signal: 1280*1024@60Hz Test Pattern:

Full Screen Red Inspection Item: Bright Dot, Partial & Line Defect

12. Green Test Signal: 1280*1024@60Hz Test Pattern:

Full Screen Green Inspection Item: Bright Dot, Partial & Line Defect

13. Blue Test Signal: 1280*1024@60Hz Test Pattern:

Full Screen Green Inspection Item: Bright Dot, Partial & Line Defect

14. Gray_Scale_0-100_V64 Test Signal: 1280*1024@60Hz Test Pattern:

Vertical 64 (256) Gray Scale (Right → Left，From 0 to 100% White) Inspection Item: Line Defect & Function Defect

15. Function Test Display pattern

Item Pattern Description Remark

1 2

3 4 5

Gray_Scale_0-100_V Gray_Scale_0-100_H

Vertical 64 (256) Gray Scale (right→left，From 0 to 100% White)

Horizontal 64 (256) Gray Scale (up→down，From 0 to 100% White)

Black Full Screen Black Figure 3

Red Full Screen 50% Red Figure 4

Green Full Screen 50% Green Figure 5

Blue Full Screen 50% Blue Figure6

Figure 1

Figure 2

7 8

White Full Screen White Figure7

Black_Tile Black Tile Under White Background Figure 8

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