ViewSonic VA702-3 Manuale utente

ViewSonic VA702-3

VA702b-3

Model No. VLCDS27998-3W

VLCDS27998-4W

17” Color TFT LCD Display

(VA702-3_VA702b-3_SM Rev. 1aMay 2006)

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

Service Manual

ViewSonic Corporation Confidential -Do Not Copy VA702-3_VA702b-3

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

Opt quest 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 05/02/2006 Initial Release J. Chang

ViewSonic Corporation Confidential -Do Not Copy VA702-3_VA702b-3

TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 3

3. Front Panel Function Control Description 7

4. Circuit Description 9

5. Adjustment Procedure 17

6. Troubleshooting Flow Chart 40

7. Recommended Spare Parts List 42

8. Exploded Diagram and Exploded Parts List 45

9. Block Diagram 49

10. Schematic Diagrams 51

11. PCB Layout Diagrams 57

ViewSonic Corporation Confidential -Do Not Copy VA702-3_VA702b-3

1. Precautions and Safety Notices

1. 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 guide line

2. Safety Check :

Care should be taken while servicing this LCD display. Because of the high voltage used in the

inverter circuit. These voltage are exposed in such areas as the associated transformer circuits .

3. POWER SUPPLY REQUIREMENTS

The external power converter for this display utilizes AC and DC cords , AC cord is detachable , but

DC cord is permanently attached . Any attempt to replace another adapter could result in serious

problem on the display .

4. LEAKAGE CURRENT HOT CHECK

4-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this

check.

4-2 Connect a 1500 ohm , 10 watt resistor , paralleled by a 0.15uF capacitor between each metallic

part and a good earth ground

4-3 Use an AC voltmeter with 1000 ohm / volt or more sensitivity and measure the AC voltage

across the combination 1500 ohm resistor and 0.15uF capacitor.

4-4 Move the resistor connection to each exposed metallic part and measure the voltage.

4-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement.

4-6 Voltage measured must not exceed 1.5 volt RMS, from any exposed metallic part to the ground.

A leakage current tester may be used in the above hot check, in which case any circuit measured

must not exceed 1.0 milliamp. In the case of a measurement exceeding the 1.0 milliamp value, a

rework is required to eliminate the chance of a shock hazard .

To Metal Parts

AC VOLTMETER

1500 10W

0.15u

Earth Ground

ViewSonic Corporation Confidential -Do Not Copy VA702-3_VA702b-3

Handling & Placing method

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 VA702-3_VA702b-3

2. Specification

GENERAL REQUIREMENTS

General Specifications

Test Resolution & Frequency 1280 x 1024 @ 60Hz

Test Image Size Full Size

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

SIGNAL INTERFACE

Video Interface

Analog Input Connector DB-15 (Analog)

Video Cable Strain Relief Equal to twice the weight of the monitor for five minutes.

Video Cable Connector DB-15 Pinout Compliant DDC 2B.

Video Signals Video RGB (Analog)

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 1/2B Compliant with Revision 1.3

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, 1280 x 720, 1280 x 1024

Exclusions Not compatible with interlaced video.

Power

Power Supply

Internal Power Supply Part Number: ADP-40AFB

Input Voltage Range 90 to 264 VAC

Input Frequency Range 47.5 to 63 Hertz

Short Circuit Protection OUTPUT CAN BE SHORTED WITHOUT DAMAGE.

Over Current Protection 4.5 A TYPICAL AT 12 VDC

Leakage Current 3.5MA (MAX) AT 254VAC / 60HZ

Efficiency 70 % TYPICAL AT 115VAC FULL LOAD

Fuse INTERNAL AND NOT USER REPLACEABLE

Power Dissipation 36 WATTS (MAX)

Max Input AC Current 1.2 ARMS @ 90VAC, 0.8 ARMS @180VAC

ViewSonic Corporation Confidential -Do Not Copy VA702-3_VA702b-3

ELECTRICAL REQUIREMENTS

Horizontal / Vertical Frequency

Horizontal Frequency 30 –80 kHz

Vertical Refresh Rate 50 –85 Hz.

Maximum Pixel Clock 135 MHz

Sync Polarity Independent of sync polarity.

Primary Presets

Primary Preset 1280 x 1024 @ 60Hz

Look up table timing

<<Analog>>

640 x 350 @ 70Hz, 31.5kHz

640 x 480 @ 60Hz, 31.5kHz

640 x 480 @ 67Hz, 35.0kHz

640 x 480 @ 75Hz, 37.5kHz

640 x 480 @ 72Hz, 37.9kHz

640 x 480 @ 85Hz, 43.27kHz

720 x 400 @ 70Hz, 31.5kHz

800 x 600 @ 56Hz, 35.1kHz

800 x 600 @ 60Hz, 37.9kHz

800 x 600 @ 75Hz, 46.9kHz

800 x 600 @ 72Hz, 48.1kHz

800 x 600 @ 85Hz, 53.7kHz

832 x 624 @ 75Hz, 49.7kHz

1024 x 768 @ 60Hz, 48.4kHz

1024 x 768 @ 70Hz, 56.5kHz

1024 x 768 @ 72Hz, 58.1kHz

1024 x 768 @ 75Hz, 60.0kHz

1024 x 768 @ 85Hz, 68.67kHz

1280 x 1024 @ 60Hz, 63.4kHz

1280 x 1024 @ 75Hz, 79.97kHz

21. 1280x720 @ 60Hz, 45kHz (HDTV)

Changing Modes

Maximum Mode Change Blank Time, for

image stability. Note:

1) Excluding “Auto Adjust” time

2) Under DOS mode (640 x 350, 720 x 400 & 640 x

400), there is no “Auto Adjust” feature.

3) The monitor needs to do “Auto Adjust” the first

time a new mode is detected.

3 seconds (Max)

1 seconds (Typ) for recognized timings

1-2 seconds (Typ) for unrecognized timing

Mode Change Image The image shall blank while the monitor changes modes.

ViewSonic Corporation Confidential -Do Not Copy VA702-3_VA702b-3

LCD Panel

1st Source Panel QD17EL0711

Type NORMALLY WHITE, TN, OPTICAL COMPENSATION FILM

Active Size 337.920 (H) x 270.336 (V)

Pixel Arrangement RGB Vertical Stripe

Pixel Pitch 0.264 mm

Glass Treatment ANTI GLARE

# of Backlights 4CCFL EDGE-LIGHT (2TOP / 2 BOTTOM)

Backlight Life 50,000 HOURS (TYP) / 40,000 HOURS (MIN)

Luminance –

Condition:

CT = 6500K, Contrast = Max, Brightness = Max

260 CD/M2 (TYP AFTER 30 MINUTE WARM UP)

220 CD/M2 (MIN AFTER 30 MINUTE WARM UP)

Brightness Uniformity 75 % Entire Area (minimum)

Contrast Ratio 500:1 (Typ), 300:1 (Min)

Color Depth 16 million colors (6 bit panel)

Viewing Angle (Horizontal) 140 deg @ CR>10, 160 deg @ CR>5

Viewing Angle (Vertical) 125 deg @ CR>10, 145 deg @ CR>5

Response Time

10%-90% @ Ta=25°C

8ms (Tr= 6 ms, Tf = 2 ms) (Typ)

TBD ms (Tr= TBD ms, Tf = TBD ms) (Max)

Panel Defects Please see Panel Quality Specifications.

MECHANICAL

Dimensions (Base attached unless otherwise specified)

Width 377.6 mm

Height 374.0 mm

Depth 195.6 mm

Depth (Head Only) 55.0 mm

Monitor Weight 4.1 kg / 9.0 lbs

Packaging Specification

Width 450 mm

Height 522 mm

Depth 135 mm

Gross Weight 5.2 kg (11.45lb)

# units per Pallet 36/72 (air/sea)

20’/40’ Container Loading, Palletized 720/1728 pieces

Ergonomics

Tilt Up 20 DEGREES MINIMUM

Tilt Down -5degrees

Swivel Right 0degrees

Swivel Left 0degrees

Height Adjust 0mm

Pivot 0DEGREES (CLOCKWISE)

ViewSonic Corporation Confidential -Do Not Copy VA702-3_VA702b-3

ENVIRONMENTAL

Environmental Conditions

Operating Temperature 0°C to +40°C

Storage Temperature -20°C to +60°C

Operating Relative Humidity 20% to 90% RH Non-Condensing

Storage Relative Humidity 5% to 90% RH Non-Condensing

Operating Altitude 0 to +3,000 meters

Storage Altitude 0 to +12,000 meters

ViewSonic Corporation Confidential -Do Not Copy VA702-3_VA702b-3

3. Front Panel Function Control Description

Main Menu

With On View controls

Front Control Panel

shown below in detail

Power On / OffDisplays the Main Menu or

exits the controlscreen

and saves adjustments.

Displays the control screen for the

highlighted control.Also toggles

between two controls on some screens.

Also a shortcut to auto image adjust

Power light

Green = ON

Orange=power

saving

Scrolls through menu options and

adjusts the displayed control.

Also a shortcut to display the

Contrast adjustment control screen.

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