ViewSonic VA712b-1, VA712-1 Service Manual

ViewSonic VA712-1

VA712b-1

Model No. VS10697

17” Color TFT LCD Display

(VA712-1_VA712b-1_SM Rev. 1b Mar. 2006)

ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA – (800) 888-8583

Service Manual

2005 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

ViewSonic is a registered trademark of ViewSonic Corporation. All other trademarks used within this document are the property of their respective owners.

Optiquest is a registered trademark of ViewSonic Corporation.

Revision History

Revision Date Description Of Changes Approval

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DCN Number ECR Number

Documents Number

Description of Changes EditorRevision SM Editing Date

03/15/05

5245

Initial Release

A. Lu

1b 03/21/06 Add Lack Of panel P/N for EPL Jamie Chang

TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 5

3. Front Panel Function Control Description 15

4. Circuit Description 21

5. Adjustment Procedure 24

6. Troubleshooting Flow Chart 39

7. Recommended Spare Parts List 44

8. Exploded Diagram and Exploded Parts List 52

9. Block Diagram 66

10. Schematic Diagrams 67

11. PCB Layout Diagrams 77

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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) 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.

1. Precautions and Safety Notices

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(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“.

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Correct Methods : Incorrect Methods : 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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VA712 Specifications (for Analog)

Chapter 1 General Descriptions

FEATURES VA712

Size 17” Luminance (Typ, cd/㎡) 350 cd/㎡ Contrast Ratio (Typ) 350:1 Colors ( 6 bit + 2 bit FRC) 16.2 M colors Response Time (Typ) 8 ms Viewing Angle (H/V) 160 ° / 120 °

TFTLCD PANEL

Recommend resolution 1280x1024@60Hz Analog (75ohms, 0.7/1.0 Vp-p) Yes

Input Signal

Digital Yes Separate Sync Yes Composite Sync No

Sync Compatibility

Sync on Green No PC Yes Power Mac Yes

Compatibility

TV Box (NextVision 6) Yes

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

On Mode(Max / Typ) 60 W / 51 W

Power Consumption

Active Off Mode (Max) ≦3 W

Audio 1 W Yes

Tilt ( 20 ° +-2° - -5 °+-1.5° )

Yes Swivel No Pivot No

Ergonomics

Height Adjust No

OSD Control

[ 1 ] [?] [?] [ 2 ] [

] [X X]

Yes

Physical (W x H x D mm) 386 x 411 x 177

Dimension

Package (W x H x D mm) 470 x 476 x 228 Physical (Net kg/lb) 4.4kg / 9.48 lbs

Weight

Package (Gross Kg/lb) 6.8 kg /15 lbs Temperature ( / )℉ ℃ 41℉-95 /℉ +5℃-+35℃

Operating Condition

Humidity (%) 20 % - 80 % Temperature ( / )℉ ℃ -4℉-131 /℉ -20℃-55℃

Storage Condition

Humidity (%) 20 % - 85 %

Regulation

UL, cUL, FCC-B, CB, CE, NOM, TUV/GS, TUV ERGO (covers ISO13406-2 & MPRII), TCO99, GOST-R + 20 ORIGINAL COPIES HYGIENIC, SASO, PCBC, VCCI, BSMI, CCC, (PSB), (C-TICK), TUV-S, Green Mark, Energy Star

2. Specification

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Chapter 2

Product definition and specification

Region VSA / VSAP(M)

VSE(E) VSCN(G)

VSJ(J)

Product Name VA712b Model Number VS10697

OSD Languages

English, French, German, Italian, Spanish, Finnish,

Japanese, Traditional Chinese, Simplified Chinese TFT LCD Panel and Model # Vendor : CMO, Model # : A170E1Scalar Model # : Genesis 5126

Input Signal Analog Sync Compatibility Separate

Audio 1 W @ < 8 % distortion Adapter 60 W (max) / 51 W (typ) Power Cable (1.8m, color: black, US type)

YES

NO NO NO

Power Cable

(1.8m, color: black, Schuko type)

YES

NO NO

Power Cable (1.8m, color: black, CCC type)

NO NO

YES

Power Cable (1.8m, color: black, PSE type)

NO NO NO

YES

Analog Cable (1.8 m, color : black), with PC 2001 and Hot Plug Detect &DDC

YES YES YES YES

Audio Cable (1.8m, Color: black) with PC 2001

YES YES YES YES

DVI Cable(1.8m, color: black) with PC 2001 NO NO NO NO

ViewSonic CD Wizard

ViewSonic Quick Start Guide

Arabic, English, Finnish, Spanish, German,

Italian, Japanese, Swedish, Polish, Korean

Portuguese, Russian, French, Simplified

Chinese, Traditional Chinese, Hungary, Czech Screen Protector Mylar

YES YES YES YES

Warranty Sticker NO NO

YES

(Chinese)

YES

(Japanese)

Warranty Card NO NO

YES

(Chinese)

YES

(Japanese)

Carton Sticker NO NO

YES

(Chinese)

PE bag of Carton NO NO

YES

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Chapter 3 GENERAL specification

Test Resolution & Frequency 1280x1024 @ 60Hz Test Image Size Full Size

Contrast and Brightness Controls

Factory Default: Contrast = 70%, Brightness = 100%

Chapter 4 VIDEO INTERFACE

Analog Input Connector DB-15 (Analog), refer the appendix A Digital Input Connector N/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 2B

Video Signals

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 TTL DDC 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 870, 1280 x 720, 1280 x 960, 1280 x 1024

* 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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Chapter 5 POWER SUPPLY

Power Supply (Adapter) Part Number: UP060B1190 or DA-60F19 Input Voltage Range 90 TO 264 VAC Input Frequency Range 47 TO 63 HERTZ Short Circuit Protection Output can be shorted without damage Over Current Protection 3.476~4.74 A typical at 18.05 VDC Leakage Current 0.25mA (Max) at 264VAC / 60Hz EFFICIENCY 80 % typical at 115VAC Full Load Fuse Internal and not user replaceable Power Dissipation 60 Watts (max) / 51 Watts (typ) Max Input AC Current 1.6 Arms @ 90VAC, INRUSH CURRENT (COLD START) 80 A @ 120VAC, 80 A(max) @220VAC

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 EN61000-4-4 ±2KV transient test with no damage

Power Supply Line Surge Immunity

Shall be able to withstand ±2KV (L-L) and ±2.3KV (LPE) 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 defined 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 < 60 W (max) / 51 W (typ) ACTIVE OFF < 3W

Recovery Time ON MODE = N/A, ACTIVE OFF < 5 SEC

Chapter 6 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.

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Chapter 7 Timing Table

Item Timing Analog

1 640 x 350 @ 70Hz, 31.5kHz Yes 2 640 x 400 @ 60Hz, 31.5kHz Yes 3 640 x 400 @ 70Hz, 31.5kHz Yes 5 640 x 480 @ 60Hz, 31.5kHz Yes 6 640 x 480 @ 67Hz, 35.0kHz Yes 7 640 x 480 @ 72Hz, 37.9kHz Yes 8 640 x 480 @ 75Hz, 37.5kHz Yes

9 640 x 480 @ 85Hz, 43.27kHz Yes 10 720 x 400 @ 70Hz, 31.5kHz Yes 11 800 x 600 @ 56Hz, 35.1kHz Yes 12 800 x 600 @ 60Hz, 37.9kHz Yes 13 800 x 600 @ 75Hz, 46.9kHz Yes 14 800 x 600 @ 72Hz, 48.1kHz Yes 15 800 x 600 @ 85Hz, 53.7kHz Yes 16 832 x 624 @ 75Hz, 49.7kHz Yes 17 1024 x 768 @ 60Hz, 48.4kHz Yes 18 1024 x 768 @ 70Hz, 56.5kHz Yes 19 1024 x 768 @ 72Hz, 58.1kHz Yes 20 1024 x 768 @ 75Hz, 60.0kHz Yes 21 1024 x 768 @ 85Hz, 68.67kHz Yes 22 1152 x 870 @ 75Hz, 68.7kHz Yes 23 1280 x 1024 @ 60Hz, 63.4kHz Yes 24 1280 x 1024 @ 75Hz, 79.97kHz Yes 25 1280x 720 @ 60Hz, 45kHz (HDTV) Yes

Note 1:When Vertical frequency at 85Hz or resolution, the vertical image size might not be full screen. But the vertical image position should be at the center. Note 2: Out of scalar chip (gm5126) limit.

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VA712B Specifications ( for Digital)

Chapter 1 General Descriptions

FEATURES VA712b

Size 17” Luminance (Typ, cd/㎡) 350 cd/㎡ Contrast Ratio (Typ) 350:1 Colors ( 6 bit + 2 bit FRC) 16.2 M colors Response Time (Typ) 8 ms Viewing Angle (H/V) 160 ° / 120 °

TFTLCD PANEL

Recommend resolution 1280x1024@60Hz Analog (75ohms, 0.7/1.0 Vp-p) Yes

Input Signal

Digital Yes Separate Sync Yes Composite Sync No

Sync Compatibility

Sync on Green No PC Yes Power Mac Yes

Compatibility

TV Box (NextVision 6) Yes

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

On Mode(Max / Typ) 60 W / 51 W

Power Consumption

Active Off Mode (Max) ≦3 W

Audio 1 W Yes

Tilt ( 20 ° +-2° - -5 °+-1.5° )

Yes Swivel No Pivot No

Ergonomics

Height Adjust No

OSD Control

[ 1 ] [?] [?] [ 2 ] [

] [X X]

Yes

Physical (W x H x D mm) 386 x 411 x 177

Dimension

Package (W x H x D mm) 470 x 476 x 228 Physical (Net kg/lb) 4.4kg / 9.48 lbs

Weight

Package (Gross Kg/lb) 6.8 kg /15 lbs Temperature ( / )℉ ℃ 41℉-95 /℉ +5℃-+35℃

Operating Condition

Humidity (%) 20 % - 80 % Temperature ( / )℉ ℃ -4℉-131 /℉ -20℃-55℃

Storage Condition

Humidity (%) 20 % - 85 %

Regulation

UL, cUL, FCC-B, CB, CE, NOM, TUV/GS, TUV ERGO (covers ISO13406-2 & MPRII), TCO99, GOST-R + 20 ORIGINAL COPIES HYGIENIC, SASO, PCBC, VCCI, BSMI, CCC, (PSB), (C-TICK), TUV-S, Green Mark, Energy Star

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Chapter 2

Product definition and specification

Region VSA / VSAP(M)

VSE(E) VSCN(G)

VSJ(J)

Product Name VA712b Model Number VS10697

OSD Languages

English, French, German, Italian, Spanish, Finnish,

Japanese, Traditional Chinese, Simplified Chinese TFT LCD Panel and Model # Vendor : CMO, Model # : A170E1Scalar Model # : Genesis 5126

Input Signal Analog + Digital Sync Compatibility Separate

Audio 1 W @ < 8 % distortion Adapter 60 W (max) / 51 W (typ) Power Cable (1.8m, color: black, US type)

YES

NO NO NO

Power Cable

(1.8m, color: black, Schuko type)

YES

NO NO

Power Cable (1.8m, color: black, CCC type)

NO NO

YES

Power Cable (1.8m, color: black, PSE type)

NO NO NO

YES

Analog Cable (1.8 m, color : black), with PC 2001 and Hot Plug Detect &DDC

YES YES YES YES

Audio Cable (1.8m, Color: black) with PC 2001

YES YES YES YES

DVI Cable(1.8m, color: black) with PC 2001 NO NO NO NO

ViewSonic CD Wizard

ViewSonic Quick Start Guide

Arabic, English, Finnish, Spanish, German,

Italian, Japanese, Swedish, Polish, Korean

Portuguese, Russian, French, Simplified

Chinese, Traditional Chinese, Hungary, Czech Screen Protector Mylar

YES YES YES YES

Warranty Sticker NO NO

YES

(Chinese)

YES

(Japanese)

Warranty Card NO NO

YES

(Chinese)

YES

(Japanese)

Carton Sticker NO NO

YES

(Chinese)

PE bag of Carton NO NO

YES

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Chapter 3 GENERAL specification

Test Resolution & Frequency 1280x1024 @ 60Hz Test Image Size Full Size

Contrast and Brightness Controls

Factory Default: Contrast = 70%, Brightness = 100%

Chapter 4 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 2B

Video Signals

1. Video RGB (Analog) Separate

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 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 870, 1280 x 720, 1280 x 960, 1280 x 1024

* 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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Chapter 5 POWER SUPPLY

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 EN61000-4-4 ±2KV transient test with no damage

Power Supply Line Surge Immunity

Shall be able to withstand ±2KV (L-L) and ±2.3KV (LPE) 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

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 < 60 W (max) / 51 W (typ) ACTIVE OFF < 3W

Recovery Time ON MODE = N/A, ACTIVE OFF < 5 SEC

Chapter 6 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.

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Chapter 7 Timing Table

Item Timing Analog Digital

1 640 x 350 @ 70Hz, 31.5kHz Yes Yes 2 640 x 400 @ 60Hz, 31.5kHz Yes Yes 3 640 x 400 @ 70Hz, 31.5kHz Yes Yes 5 640 x 480 @ 60Hz, 31.5kHz Yes Yes 6 640 x 480 @ 67Hz, 35.0kHz Yes Yes 7 640 x 480 @ 72Hz, 37.9kHz Yes Yes 8 640 x 480 @ 75Hz, 37.5kHz Yes Yes

9 640 x 480 @ 85Hz, 43.27kHz Yes Yes 10 720 x 400 @ 70Hz, 31.5kHz Yes Yes 11 800 x 600 @ 56Hz, 35.1kHz Yes Yes 12 800 x 600 @ 60Hz, 37.9kHz Yes Yes 13 800 x 600 @ 75Hz, 46.9kHz Yes Yes 14 800 x 600 @ 72Hz, 48.1kHz Yes Yes 15 800 x 600 @ 85Hz, 53.7kHz Yes Yes 16 832 x 624 @ 75Hz, 49.7kHz Yes Yes 17 1024 x 768 @ 60Hz, 48.4kHz Yes Yes 18 1024 x 768 @ 70Hz, 56.5kHz Yes Yes 19 1024 x 768 @ 72Hz, 58.1kHz Yes Yes 20 1024 x 768 @ 75Hz, 60.0kHz Yes Yes 21 1024 x 768 @ 85Hz, 68.67kHz Yes Yes 22 1152 x 870 @ 75Hz, 68.7kHz Yes Yes 23 1280 x 1024 @ 60Hz, 63.4kHz Yes Yes 24 1280 x 1024 @ 75Hz, 79.97kHz Yes No 25 1280x 720 @ 60Hz, 45kHz (HDTV) Yes Yes

Note 1:When Vertical frequency at 85Hz or resolution, the vertical image size might not be full screen. But

the vertical image position should be at the center.

Note 2: Out of scalar chip (gm5126) limit.

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Adjusting the Screen Image

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

Main Menu

with OnView controls

Front Control Panel

shown below in detail

Scrolls through menu options and adjusts the displayed control.

Also a shortcut to display the Contrast adjustment control screen.

Displays the control screen for the highlighted control.

Also toggles between two controls on some screens.

Also a shortcut to toggle analog and digital connection.

Power light Green = ON Orange = Power Saving

Standby Power On/Off

Displays the Main Menu or

exits the control screen and

saves adjustments.

Audio Mute

button turns

the sound off

3. Front Panel Function Control Description

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Do the following to adjust the screen image:

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

NOTE: All OnView 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 you want to adjust, press S or T to scroll up or down the Main Menu.

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

appears.

4. To adjust the control, 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 your computer's graphic card so that it outputs a video signal 1280 x 1024 @ 60Hz to the LCD display. (Look for instructions on “changing the refresh rate” in your graphic 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.)

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.

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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.

Audio Adjust

Vol um e increases the volume, decreases the volume, and mutes the audio.

Mute temporarily silences audio output.

Color Adjust provides several color adjustment modes: preset color

temperatures and RGB which allows you to adjust red (R), green (G), and blue (B) separately. The factory setting for this product is 6500K (6500 Kelvin).

9300K-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.

5000K-Adds blue and 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].

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.

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Control Explanation

Information displays the timing mode (video signal input) coming from the graphics card in your computer, the LCD model number, the serial number, and the ViewSonic website URL. See your graphic cards user guide for instructions on changing the resolution and refresh rate (vertical frequency).

NOTE: VESA 1280 x 1024 @ 60Hz (recommended) means that the resolution is 1280 x 1024 and the refresh rate is 60 Hertz.

Manual Image Adjust Sub-menu

H. Size (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 the text and/or graphic characters.

NOTE: Try Auto Image Adjust first.

Sharpness adjusts the clarity and focus of the screen image.

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Control Explanation

Setup menu displays the menu shown below:

Language allows you to choose the language used in the menus and control

screens.

Resolution Notice allows you to enable or disable this notice.

If you enable the Resolution Notice shown above and your computer is set at a resolution other than 1280 x 1024, the following screen appears.

OSD Position allows you to move the on-screen display menus and control screens.

OSD Timeout sets the length of time the on-screen display 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 On/Off allows you to turn the On-Screen Display 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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[1] Main Menu

[2] Input toggle (Analog or Digital) or Auto Image Adjust.

[▼] 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

1. Turn off [Power on/off] button.

2. Press [▲] + [▼] + [Power

on/off] at same time

3. Press [1]

All Mode Reset. It will erase all end users’ setting and restore the factory

defaults.

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

Hot Keys for Factory Control

3. Turn off [Power on/off] button.

4. Press [▲] + [▼] + [Power on/off] at same time

5. Press [1]

Then you will see the BIOS update picture show in the screen as below.

17E1HG3004

Hot Keys for Function Controls

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Circuit Description

1. Power supply (DC/DC Converter)

The AT1741 is 2-channel PWM switching regulator controllers that contains an on-chip 2.5V reference, two error amplifier, an adjustable oscillator, two dead-time comparators, under voltage lockout circuitry and 2 common-emitter output. It is idea for step-up, step-down, and inverting converter.

4. Circuit Description

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2. Flash Memory

The F29C51001T/F29C51001B is a 1 Megabit, 5.0 Volt-only Flash Memory organized as 131,072 bytes of 8 bits each. This device is designed to use a 4.7 Volt to 5.3 Volt power supply to perform in-system programming. The 1 Megabit memory array is divided into thirty-two uniform blocks of 4 Kbytes each for data and/or code storage.

The block architecture allows users to flexibly make chip erase or block erase operation. The block erase feature allows a particular block to be erased and reprogrammed without affecting the data in other blocks. After the device performs chip erase or block erase operation, it can be reprogrammed on a byte-by-byte basis.

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+ 56 hidden pages

ViewSonic VA712b-1, VA712-1 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual