ViewSonic VA702-2 Manuale utente

ViewSonic VA702-2

VA721-3

VA721b-3

Model No. VS10781

17” Color TFT LCD Display

(VA702-2_VA721-3_VA721b-3_SM Rev. 1bSep. 2006)

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

Service Manual

ViewSonic Corporation Confidential -Do Not Copy

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 03/06/2006 Initial Release Jamie Chang

VS-E060223

VA702-2_VA721-3_VA721b-3

1b09/01/2006 Add panel source (MT170EN01 V7) Jamie Chang

VS-E060293 Add panel source (MT170EN01 VA)

ViewSonic Corporation Confidential -Do Not Copy VA702-2_VA721-3_VA721b-3

TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 4

3. Front Panel Function Control Description 13

4. Circuit Description 17

5. Adjustment Procedure 27

6. Troubleshooting Flow Chart 33

7. Recommended Spare Parts List 40

8. Exploded Diagram and Exploded Parts List 46

9. Block Diagram 50

10. Schematic Diagrams 51

11. PCB Layout Diagrams 59

ViewSonic Corporation Confidential -Do Not Copy

1. Precautions and Safety Notices

SAFETY PRECAUTIONS

This monitor is manufactured and tested on a ground principle that a user’s safety comes first.

However, improper used or installation may cause damage to the monitor as well as to the user.

WARNINGS:

lThis monitor should be operated only at the correct power sources indicated on the label on the

rear of the monitor. If you’re unsure of the power supply in you residence, consult your local

dealer or Power Company.

lUse only the special power adapter that comes with this monitor for power input.

lDo not try to repair the monitor by yourself, as it contains no user-serviceable parts. Only the

qualified technician can repair it.

lDo not remove the monitor cabinet. There are high-voltage parts inside that may cause electric

shock to human bodies.

lStop using the monitor if the cabinet is damaged. Have it checked by a service technician.

lPut your monitor only in a lean, cool, dry environment. If it gets wet, unplug the power cable

immediately and consult your closed dealer.

lAlways unplug the monitor before cleaning it. Clean the cabinet with a clean, dry cloth. Apply

non-ammonia based cleaner onto the cloth, not directly onto the glass screen.

lDo not place heavy objects on the monitor or power cord.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety visual inspections and the

protection afforded by them cannot necessarily be obtained by using replacement components

rated for higher voltage, wattage, etc. Before replacing any of these components read the parts list

in this manual carefully. The use of substitute replacement parts, which do not have the same

safety characteristics as specified in the parts list, may create shock, fire, or other hazards.

SERVICE NOTES

lWhen replacing parts or circuit boards, clamp the lead wires around terminals before soldering.

lKeep wires away from high voltage, high temperature components and sharp edges.

lKeep wires in their original position so as to reduce interference.

lAdjustment of this product please refers to the user’ manual.

VA702-2_VA721-3_VA721b-3

ViewSonic Corporation Confidential -Do Not Copy

Handling and Placing Methods

VA702-2_VA721-3_VA721b-3

Correct Methods: Incorrect Methods:

Only touch the metal of the LCD panel or the front

cover of he monitor. Do not touch the surface of the

polarizer.

Surface of the LCD panel is pressed by fingers and

that may cause "Mura".

Take out the monitor with cushions. Taking out the monitor by grasping the LCD panel.

That may cause "Mura".

ViewSonic Corporation Confidential -Do Not Copy

VA702-2_VA721-3_VA721b-3

Correct Methods: Incorrect Methods:

Place the monitor on a clean and soft foam pad. Placing the monitor on foreign objects, That could

scratch the surface of the panel or cause "Mura".

The panel is placed facedown on the lap. That may

cause "Mura".

ViewSonic Corporation Confidential -Do Not Copy

2. Specification

1. INTPRODUCTION

VA702-2_VA721-3_VA721b-3

FEATURES VA702/b-2 / VA702/b-2U

Size 17 “

Luminance (Typ) 300 cd/㎡

Contrast Ratio (Typ) 500:1

Colors (6 bits + 2 bits FRC) 16.2 M

Response Time (Typ) 8 ms

Viewing Angle (H/V) 140 ° / 130 °

1st panel source

TFTLCD PANEL

Recommend resolution 1280x1024@60Hz

Size 17 “

Luminance (Typ) 300 cd/㎡

Contrast Ratio (Typ) 500:1

Colors (6 bits + 2 bits FRC) 16.2 M

Response Time (Typ) 8 ms

Viewing Angle (H/V) 150 ° / 135 °

2nd panel source

TFTLCD PANEL

Recommend resolution 1280x1024@60Hz

Size 17 “

Luminance (Typ) 280 cd/㎡

Contrast Ratio (Typ) 600:1

Colors (6 bits + 2 bits FRC) 16.2 M

Response Time (Typ) 8 ms

Viewing Angle (H/V) 150 ° / 135°

3rd panel source

TFTLCD PANEL

Recommend resolution 1280x1024@60Hz

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

Input Signal Digital No

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) 36 W/ 35 W

Power Consumption Off Mode (Max) ≦1 W

Audio No

Tilt ( 20 ° - -5 °) Yes

Swivel No

Pivot No

Ergonomics

Height Adjust No

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

Physical (W x H x D) 378 x 374 x 196 mm

Dimension Package (W x H x D) 440 x 511 x 132 mm

Physical (Net Weight) 4.5 kg

Weight Package (Gross Weight) 6.2 kg

Temperature ( / )℉℃ 32℉-104℉/ 0℃-40℃

Operating Condition Humidity (%) 10 % - 90 %

Temperature ( / )℉℃ -4℉-140℉/ -20℃-60℃

Storage Condition Humidity (%) 5 % - 90 %

Regulation

UL, cUL, FCC-B, CB, CE, ENERGY, NOM, TUV/GS, TUV ERGO

(covers ISO13406-2 & MPRII), TCO’03, GOST-R+20 ORIGINAL

COPIES HYGIENIC, SASO, PCBC, VCCI, BSMI, CCC, (PSB), (C-

TICK), TUV-S, Green Mark, Energy Star, WEEE, RoHS

2 GENERAL specification

Test Resolution & Frequency 1280x1024 @ 60Hz

Test Image Size Full Size

Contrast and Brightness Controls Factory Default:

Contrast = 70%, Brightness = 100%

ViewSonic Corporation Confidential -Do Not Copy

VA702-2_VA721-3_VA721b-3

FEATURES VA721/b-3

Size 17 “

Luminance (Typ) 300 cd/㎡

Contrast Ratio (Typ) 500:1

Colors (6 bits + 2 bits FRC) 16.2 M

Response Time (Typ) 8 ms

Viewing Angle (H/V) 150 ° / 135 °

1st panel source

TFTLCD PANEL

Recommend resolution 1280x1024@60Hz

Size 17 “

Luminance (Typ) 280 cd/㎡

Contrast Ratio (Typ) 600:1

Colors (6 bits + 2 bits FRC) 16.2 M

Response Time (Typ) 8 ms

Viewing Angle (H/V) 150 ° / 135°

2nd panel source

TFTLCD PANEL

Recommend resolution 1280x1024@60Hz

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

Input Signal Digital No

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) 36 W/ 35 W

Power Consumption Off Mode (Max) ≦1 W

Audio No

Tilt ( 20 ° - -5 °) Yes

Swivel No

Pivot No

Ergonomics

Height Adjust No

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

Physical (W x H x D) 378 x 374 x 196 mm

Dimension Package (W x H x D) 440 x 511 x 132 mm

Physical (Net Weight) 4.5 kg

Weight Package (Gross Weight) 6.2 kg

Temperature ( / )℉℃ 32℉-104℉/ 0℃-40℃

Operating Condition Humidity (%) 10 % - 90 %

Temperature ( / )℉℃ -4℉-140℉/ -20℃-60℃

Storage Condition Humidity (%) 5 % - 90 %

Regulation

UL, cUL, FCC-B, CB, CE, ENERGY, NOM, TUV/GS, TUV ERGO (covers

ISO13406-2 & MPRII), TCO’03, GOST-R+20 ORIGINAL COPIES HYGIENIC,

SASO, PCBC, VCCI, BSMI, CCC, (PSB), (C-TICK), TUV-S, Green Mark,

Energy Star, WEEE, RoHS

ViewSonic Corporation Confidential -Do Not Copy

3VIDEO INTERFACE

Analog Input Connector DB-15 (Analog), refer the appendix A

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 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 LVDS

DDC 1/2B 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 1024

Exclusions Not compatible with interlaced video

4POWER SUPPLY

VA702-2_VA721-3_VA721b-3

Internal Power Supply Part Number: ILIPI-004

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 2.4 A typical at 14.2 VDC

Leakage Current 3.5mA (Max) at 254VAC / 60Hz

Efficiency 80% typical at 115VAC Full Load

Fuse Internal and not user replaceable

Power Dissipation 36w (max) / 35 Watts (typ)

Max Input AC Current 0.8 Arms @ 90VAC, 0.4 Arms @265VAC

INRUSH CURRENT (COLD START) 30 A @ 120VAC, 50 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 ANSI/IEEE

C62.41-1980 2000V 200 ampere ring wave

transient test with no damage

Power Supply Line Surge Immunity

Shall be able to withstand 1.5 times

nominal line voltage for one cycle with no

damage

Power Supply Missing Cycle Immunity

Shall be able to function properly, without

reset or visible screen artifacts, when ½

cycle of AC power is randomly missing at

nominal input

Power Supply Acoustics

The power supply shall not produce audible

noise that would be detectable by the user.

Audible shall be defined to be in compliance

with ISO 7779 (DIN EN27779:1991) Noise

measurements of machines acoustics.

Power Switch noise shall not be considered

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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 < 36 W (max)

Off Mode< 1W

Recovery Time On Mode = N/A, Active Off < 3 sec

5ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency 30 –82 kHz

Vertical Refresh Rate 50 –85* Hz.

* When the resolution is set to 1280 x 1024, the vertical refresh

rate may be up to 75 Hz; for all other resolutions, the vertical

refresh rate may be up to 85Hz.

Maximum Pixel Clock 140 MHz

Sync Polarity Independent of sync polarity.

Timing Table

Item Timing Analog

1640 x 350 @ 70Hz, 31.5kHz Yes

2640 x 400 @ 60Hz, 31.5kHz Yes

3640 x 400 @ 70Hz, 31.5kHz Yes

4640 x 480 @ 50Hz, 24.7kHz Yes

5640 x 480 @ 60Hz, 31.5kHz Yes

6640 x 480 @ 67Hz, 35.0kHz Yes

7640 x 480 @ 72Hz, 37.9kHz Yes

8640 x 480 @ 75Hz, 37.5kHz Yes

9640 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, 49.7kHzYes

17 1024 x 768 @ 60Hz, 48.4kHz Yes

18 1024 x 768 @ 70Hz, 56.5kHz Yes

19 1024 x 768 @ 72Hz, 58.1kHz Yes

VA702-2_VA721-3_VA721b-3

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