ViewSonic VA702-2 User manual

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 –[phone]
Service Manual

ViewSonic Corporation Confidential -Do Not Copy
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Copyright
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 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
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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

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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

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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".

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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".

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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%
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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

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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