ViewSonic VA702-1 User manual

ViewSonic VA702-1
VA702b-1
Model No. VS10781
17” Color TFT LCD Display
(VA702-1_ VA702b-1_SM Rev. 1b Sep. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - [phone]
Service Manual

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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
1b9/12/2006 Add 2nd panel V7 & VA (updated RSPL, BOM) Jamie Chang
1a Initial Release G. Han
10/20/05

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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 18
5. Adjustment Procedure 29
6. Troubleshooting Flow Chart 35
7. Recommended Spare Parts List 42
8. Exploded Diagram and Exploded Parts List 47
9. Block Diagram 49
10. Schematic Diagrams 50
11. PCB Layout Diagrams 58

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1. Precautions and Safety Notices
1. 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:
zThis 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.
zUse only the special power adapter that comes with this monitor for power input.
zDo not try to repair the monitor by yourself, as it contains no user-serviceable parts. Only the qualified
technician can repair it.
zDo not remove the monitor cabinet. There are high-voltage parts inside that may cause electric shock to
human bodies.
zStop using the monitor if the cabinet is damaged. Have it checked by a service technician.
zPut your monitor only in a lean, cool, dry environment. If it gets wet, unplug the power cable immediately
and consult your closed dealer.
zAlways 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.
zDo not place heavy objects on the monitor or power cord.
2. 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.
3. SERVICE NOTES
zWhen replacing parts or circuit boards, clamp the lead wires around terminals before soldering.
zKeep wires away from high voltage, high temperature components and sharp edges.
zKeep wires in their original position so as to reduce interference.
zAdjustment of this product please refers to the user’ manual.

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4. Handling and Placing Methods
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".

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
INTRODUCTION
FEATURES VA702/b
Size 17 “
Luminance (Typ) 300 cd/㎡
Contrast Ratio (Typ) 500:1
Colors (6 bits + 2 bits FRC) 16.2 M
Response Time (Typ) 12 ms
Viewing Angle (H/V) 140 ° / 125 °
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
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
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
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
Operating Condition Temperature ( / )℉℃ 32℉-104℉/ 0℃-40℃
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, RoHS, WEEE

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GENERAL specification
Test Resolution & Frequency 1280x1024 @ 60Hz
Test Image Size Full Size
Contrast and Brightness Controls Factory Default:
Contrast = 70%, Brightness = 100%
VIDEO 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

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POWER SUPPLY
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 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
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) / 35 W(typ)
Off Mode< 1W
Recovery Time On Mode = N/A, Active Off < 3 sec

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ELECTRICAL 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
1 640 x 350 @ 70Hz, 31.5kHz Yes
2 640 x 400 @ 60Hz, 31.5kHz Yes
3 640 x 400 @ 70Hz, 31.5kHz Yes
4 640 x 480 @ 50Hz, 24.7kHz 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
Primary Presets
1280x1024 @ 60Hz
User Presets
Number of User Presets (recognized timings) Available: 10 presets total in FIFO
configuration
Changing Modes
● Maximum Mode Change Blank Time for image stability: 3 seconds (Max), excluding
“Auto Image Adjust” time.
● Under DOS mode (640 x 350, 720 x 400 & 640 x 400), it should recall factory setting
when execute “Auto Image Adjust”.
● The monitor needs to do “Auto Image Adjust” the first time when a new mode is
detected. (See section “0-Touch™ Function Actions”)