Viewsonic VA712-1W, VA712-1 Service Manual

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 – [phone]

Copyright

Copyright

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

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

Documents Number

DCN Number ECR Number

1a

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

03/15/05

5245

S

Initial Release

Description of Changes EditorRevision SM Editing Date

A. Lu

ViewSonic Corporation Confidential

i

-

Do Not Copy VA712-1_VA712b-1

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

ViewSonic Corporation Confidential

ii

-

Do Not Copy VA712-1_VA712b-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.

ViewSonic Corporation Confidential

1

-

Do Not Copy VA712-1_VA712b-1

(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

2

-

Do Not Copy VA712-1_VA712b-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“.

ViewSonic Corporation Confidential

3

-

Do Not Copy VA712-1_VA712b-1

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

ViewSonic Corporation Confidential

4

-

Do Not Copy VA712-1_VA712b-1

2. Specification

VA712 Specifications (for Analog)

Chapter 1 General Descriptions

FEATURES VA712

Size 17”
Luminance (Typ, cd/㎡) 350 cd/㎡
Contrast Ratio (Typ) 350:1

TFTLCD PANEL

Input Signal

Sync Compatibility

Compatibility

Power Voltage AC 100-240V, 50/60Hz Yes
Power Consumption
Audio 1 W Yes

Ergonomics

OSD Control

Dimension

Weight

Operating Condition

Storage Condition

Regulation

Colors ( 6 bit + 2 bit FRC) 16.2 M colors
Response Time (Typ) 8 ms
Viewing Angle (H/V) 160 ° / 120 °
Recommend resolution 1280x1024@60Hz
Analog (75ohms, 0.7/1.0 Vp-p) Yes
Digital Yes
Separate Sync Yes
Composite Sync No
Sync on Green No
PC Yes
Power Mac Yes
TV Box (NextVision 6) Yes

On Mode(Max / Typ) 60 W / 51 W
Active Off Mode (Max) ≦3 W

Tilt ( 20 ° +-2° - -5 ° +-1.5°)
Swivel No
Pivot No
Height Adjust No

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

Physical (W x H x D mm) 386 x 411 x 177
Package (W x H x D mm) 470 x 476 x 228
Physical (Net kg/lb) 4.4kg / 9.48 lbs
Package (Gross Kg/lb) 6.8 kg /15 lbs
Temperature ( / )℉ ℃ 41℉-95 /℉ +5℃-+35℃
Humidity (%) 20 % - 80 %
Temperature ( / )℉ ℃ -4℉-131 /℉ -20℃-55℃
Humidity (%) 20 % - 85 %
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

] [X X]

Yes

Yes

ViewSonic Corporation Confidential

5

-

Do Not Copy VA712-1_VA712b-1

Chapter 2

Region VSA / VSAP(M)

Product Name VA712b
Model Number VS10697

OSD Languages
TFT LCD Panel and Model # Vendor : CMO, Model # : A170E1-

Scalar 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)
Power Cable

Power Cable (1.8m, color: black, CCC type)
Power Cable (1.8m, color: black, PSE type)
Analog Cable (1.8 m, color : black), with PC 2001

and Hot Plug Detect &DDC
Audio Cable (1.8m, Color: black) with PC 2001
DVI Cable(1.8m, color: black) with PC 2001 NO NO NO NO

Product definition and specification

(1.8m, color: black, Schuko type)

VSE(E) VSCN(G)

English, French, German, Italian, Spanish, Finnish,
Japanese, Traditional Chinese, Simplified Chinese

YES

NO
NO NO

NO NO NO

YES YES YES YES

YES YES YES YES

NO NO NO

YES

NO NO

YES

VSJ(J)

NO

YES

ViewSonic CD Wizard

ViewSonic Quick Start Guide
Screen Protector Mylar
Warranty Sticker NO NO

Warranty Card NO NO

Carton Sticker NO NO
PE bag of Carton NO NO

Arabic, English, Finnish, Spanish, German,
Italian, Japanese, Swedish, Polish, Korean
Portuguese, Russian, French, Simplified
Chinese, Traditional Chinese, Hungary, Czech

YES YES YES YES

YES

(Chinese)

YES

(Chinese)

YES

(Chinese)

YES

YES

(Japanese)

YES

(Japanese)

NO
NO

ViewSonic Corporation Confidential

6

-

Do Not Copy VA712-1_VA712b-1

Chapter 3 GENERAL specification

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

Contrast and Brightness Controls

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 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

Resolution Compatibility

Exclusions Not compatible with interlaced video

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

Video RGB (Analog)
Separate

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 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.

ViewSonic Corporation Confidential

7

-

Do Not Copy VA712-1_VA712b-1

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

Shall start and function properly when under full load,

Power Supply Cold Start

Power Supply Transient Immunity

Power Supply Line Surge Immunity

Power Supply Missing Cycle Immunity

Power Supply Acoustics

US Type Power Cable

European Type Power Cable

CCC Type Power Cable

PSE Type Power Cable

Power Saving Operation(Method) VESA DPMS Signaling
Power Consumption
Recovery Time ON MODE = N/A, ACTIVE OFF < 5 SEC

Chapter 6 ELECTRICAL REQUIREMENT

with all combinations of input voltage, input frequency,
and operating temperature
Shall be able to withstand an EN61000-4-4 ±2KV
transient test with no damage
Shall be able to withstand ±2KV (L-L) and ±2.3KV (L­PE) with no damage
Shall be able to function properly, without reset or visible
screen artifacts, when ½ cycle of AC power is randomly
missing at nominal input
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
Separate 3-prong NEMA 5-15P type plug. Length =

1.8m. Connects to display.
Color = Black
Schuko CEE7-7 type plug.
Length = 1.8m, Connects to display.
Color = Black
Separate 3-prong type plug.
Length = 1.8m. Connects to display.
Color = Black
Separate 2-prong NEMA 1-15P type plug. Length =

1.8m. Connects to display.
Color = Black

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

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.

ViewSonic Corporation Confidential

8

-

Do Not Copy VA712-1_VA712b-1

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.

ViewSonic Corporation Confidential

9

-

Do Not Copy VA712-1_VA712b-1

VA712B Specifications ( for Digital)

Chapter 1 General Descriptions

FEATURES VA712b

Size 17”
Luminance (Typ, cd/㎡) 350 cd/㎡
Contrast Ratio (Typ) 350:1

TFTLCD PANEL

Input Signal

Sync Compatibility

Compatibility

Power Voltage AC 100-240V, 50/60Hz Yes
Power Consumption
Audio 1 W Yes

Ergonomics

OSD Control

Dimension

Weight

Operating Condition

Storage Condition

Regulation

Colors ( 6 bit + 2 bit FRC) 16.2 M colors
Response Time (Typ) 8 ms
Viewing Angle (H/V) 160 ° / 120 °
Recommend resolution 1280x1024@60Hz
Analog (75ohms, 0.7/1.0 Vp-p) Yes
Digital Yes
Separate Sync Yes
Composite Sync No
Sync on Green No
PC Yes
Power Mac Yes
TV Box (NextVision 6) Yes

On Mode(Max / Typ) 60 W / 51 W
Active Off Mode (Max) ≦3 W

Tilt ( 20 ° +-2° - -5 °+-1.5°)
Swivel No
Pivot No
Height Adjust No

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

Physical (W x H x D mm) 386 x 411 x 177
Package (W x H x D mm) 470 x 476 x 228
Physical (Net kg/lb) 4.4kg / 9.48 lbs
Package (Gross Kg/lb) 6.8 kg /15 lbs
Temperature ( / )℉ ℃ 41℉-95 /℉ +5℃-+35℃
Humidity (%) 20 % - 80 %
Temperature ( / )℉ ℃ -4℉-131 /℉ -20℃-55℃
Humidity (%) 20 % - 85 %
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

] [X X]

Yes

Yes

ViewSonic Corporation Confidential

10

-

Do Not Copy VA712-1_VA712b-1

Chapter 2

Region VSA / VSAP(M)

Product Name VA712b
Model Number VS10697

OSD Languages
TFT LCD Panel and Model # Vendor : CMO, Model # : A170E1-

Scalar 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)
Power Cable

Power Cable (1.8m, color: black, CCC type)
Power Cable (1.8m, color: black, PSE type)
Analog Cable (1.8 m, color : black), with PC 2001

and Hot Plug Detect &DDC
Audio Cable (1.8m, Color: black) with PC 2001
DVI Cable(1.8m, color: black) with PC 2001 NO NO NO NO

Product definition and specification

(1.8m, color: black, Schuko type)

VSE(E) VSCN(G)

English, French, German, Italian, Spanish, Finnish,
Japanese, Traditional Chinese, Simplified Chinese

YES

NO
NO NO

NO NO NO

YES YES YES YES

YES YES YES YES

NO NO NO

YES

NO NO

YES

VSJ(J)

NO

YES

ViewSonic CD Wizard

ViewSonic Quick Start Guide
Screen Protector Mylar
Warranty Sticker NO NO

Warranty Card NO NO

Carton Sticker NO NO
PE bag of Carton NO NO

Arabic, English, Finnish, Spanish, German,
Italian, Japanese, Swedish, Polish, Korean
Portuguese, Russian, French, Simplified
Chinese, Traditional Chinese, Hungary, Czech

YES YES YES YES

YES

(Chinese)

YES

(Chinese)

YES

(Chinese)

YES

YES

(Japanese)

YES

(Japanese)

NO
NO

ViewSonic Corporation Confidential

11

-

Do Not Copy VA712-1_VA712b-1

Chapter 3 GENERAL specification

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

Contrast and Brightness Controls

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

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

Resolution Compatibility

Exclusions Not compatible with interlaced video

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

1. Video RGB (Analog)
Separate

2. TMDS (Digital)

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 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.

ViewSonic Corporation Confidential

12

-

Do Not Copy VA712-1_VA712b-1

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

Shall start and function properly when under full load,

Power Supply Cold Start

Power Supply Transient Immunity

Power Supply Line Surge Immunity

Power Supply Missing Cycle Immunity

Power Supply Acoustics

US Type Power Cable

European Type Power Cable

CCC Type Power Cable

PSE Type Power Cable

Power Saving Operation(Method) VESA DPMS Signaling
Power Consumption
Recovery Time ON MODE = N/A, ACTIVE OFF < 5 SEC

Chapter 6 ELECTRICAL REQUIREMENT

with all combinations of input voltage, input frequency,
and operating temperature
Shall be able to withstand an EN61000-4-4 ±2KV
transient test with no damage
Shall be able to withstand ±2KV (L-L) and ±2.3KV (L­PE) with no damage
Shall be able to function properly, without reset or visible
screen artifacts, when ½ cycle of AC power is randomly
missing at nominal input
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
Separate 3-prong NEMA 5-15P type plug. Length =

1.8m. Connects to display.
Color = Black
Schuko CEE7-7 type plug.
Length = 1.8m, Connects to display.
Color = Black
Separate 3-prong type plug.
Length = 1.8m. Connects to display.
Color = Black
Separate 2-prong NEMA 1-15P type plug. Length =

1.8m. Connects to display.
Color = Black

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

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.

ViewSonic Corporation Confidential

13

-

Do Not Copy VA712-1_VA712b-1

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.

ViewSonic Corporation Confidential

14

-

Do Not Copy VA712-1_VA712b-1

3. Front Panel Function Control Description

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

Displays the Main Menu or

exits the control screen and

saves adjustments.

Audio Mute

button turns

the sound off

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

ViewSonic Corporation Confidential

15

-

Do Not Copy VA712-1_VA712b-1

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.

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 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.)

ViewSonic Corporation Confidential

16

-

Do Not Copy VA712-1_VA712b-1

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.

ViewSonic Corporation Confidential

17

-

Do Not Copy VA712-1_VA712b-1

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.

ViewSonic Corporation Confidential

18

-

Do Not Copy VA712-1_VA712b-1

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.

ViewSonic Corporation Confidential

19

-

Do Not Copy VA712-1_VA712b-1

Hot Keys for Function Controls

[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

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

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

[1] + [▼] + [▲] White Balance. (Not shown on user’s guide)

[1] + [▼] Power Lock

[1] + [▲] OSD Lock

OSD by push button [2]

mode

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

2. Press [▲] + [▼] + [Power

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

defaults.

on/off] at same time

3. Press [1]

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

ViewSonic Corporation

20

Confidential

-

Do Not Copy VA712-1_VA712b-1

4. Circuit Description

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.

ViewSonic Corporation Confidential

21

-

Do Not Copy VA712-1_VA712b-1

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.

ViewSonic Corporation Confidential

22

-

Do Not Copy VA712-1_VA712b-1