ViewSonic VG800-2 User manual

Service Manual
Model No. VLCDS23896-5W
18” Color TFT LCD Display
ViewSonic VG800b
ViewSonic381 Brea Canyon Road, Walnut, California 91789 USA - [phone]
VG800b-1_SM_606 - Rev. 1a – Oct 2002)

Copyright
Copyright
¤
2002 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
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 Date Description Of Changes Approval
1a 10/22/02 Initial Release DCN-2660 C.Shen
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TABLE OF CONTENTS
1..
SPECIFICATIONS
..............................................................................1.
2. ..................................................................................................2-32
3. CIRCUIT DESCRIPTIONS....................................................................................33-49
4. ADJUSTMENT........................................................................................................50-54
5.
MECHANICAL ASSEMBLY...................................................................................55-59
6. SPARE PARTS LISTS.......................................................................................60-78
7.SCHEMATIC DIAGRAMS.......................................................................................80-88
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PRECAUTIONS AND NOTICES
8.PCB DRAWING...................................................................................................89-90

1. PRECAUTIONS AND NOTICES
Prior to using this manual, please ensure that you have carefully followed all the procedures
outlined in the user manual for this product.
zRead all of these instructions.
zSave these instructions for later use.
zFollow all warnings and instructions marked on the product.
zDo not use this product near water.
zThis display should be installed on a solid horizontal base.
zWhen cleaning, use only a neutral detergent cleaner with a soft damp cloth. Do not spray
with liquid or aerosol cleaners.
zDo not expose this display to direct sunlight or heat. Hot air may cause damage to the cabinet
and other parts.
zAdequate ventilation must be maintained to ensure reliable and continued operation and to
protect the display from overheating. Do not block ventilation slots and openings with objects or
install the display in a place where ventilation may be hindered.
zDo not install this display near a motor or transformer where strong magnetism is generated.
Images on the display will become distorted and the color irregular.
zDo not allow metal pieces or objects of any kind fall into the display from ventilation holes.
Slots and openings in the cabinet and the back or bottom are provided for ventilation, to ensure reliable
operation of the product and to protect it from overheating, those openings mustnot be blocked or
covered. The openings should never be blocked by placing the product on a bed, sofa, rug, or other
similar surface. This product should never be placed near or over a radiator or heat register. This
product should not be placed in a built-in installation unless proper ventilation is provided.
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2.SPECIFICATIONS
Content
1.Scope
2. General Description (Quick Reference)
3. Electrical Characteristics
4. Mechanical Characteristics
5. Packaging
6. Environmental Characteristics
7. Factory Setting for Shipment
Appendix I (Preset Signal Timing)
Appendix II (EDID Code)
Appendix III (Label printing)
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1. Scope
The following specifications are applicable to model VG800b 18 inch color
LCD monitor.
2. General Description (Quick Reference)
Chi-Mei 18.0” SXGA TFT- MVA
LCD
Size
Effective Display Size
Pixel Pitch
Resolution
Brightness
Contrast Ratio
Color
Viewing Angle
Surface treatment
18.0 inches diagonal
357.12 mm X 285.696 mm (typical)
0.279 mm X 0.279 mm
1280 x 1024 dot (SXGA)
250 cd / m² (typ.), 200(min.)
600:1(max), 400:1(typ.), 300 (min.)
16,777,216
Up 80° Down 80°(min.)
Left 80° Right 80°(min.)
CR>10:1
Anti-Glare
Input Signals RGB Analog 0.7 Vp-p / 75Ө
Separate sync.
Composite sync
Sync-On-Green
Positive Polarity
TTL level
Input connector Analog mini D-sub 15 pin x 1
Audio min-Din 2 channel x 2
Speaker Max 3W x 2
Main IC GM5020
Display Colors 16,777,216
Preset Timings 1280x1024@60Hz, 75Hz,
1024x768@60Hz, 70Hz, 75Hz, 85Hz
800x600@56Hz, 60Hz, 72Hz, 75Hz, 85Hz
640x480@60Hz, 72Hz, 75Hz, 85Hz
720x400@70Hz
Synchronization Horizontal
Vertical
Non-interlaced
30 kHz to 82 kHz
50 Hz to 85 Hz
Max Pixel Rated 135Mhz
(automatically)
(automatically)
Resolution Horizontal
Vertical
1280 dots
1024 lines
Active Display
Area
Horizontal
Vertical
357.12 mm (typical)
285.696 mm (typical)
(Active display area is dependent upon signal timings)
Power Supply
Rating
AC adapter input
DC input
AC90V-264V 50 / 60 Hz
DC 12V
AC Power
Consumption
60W
less than 3W
On mode
Off mode( w/o audio cable connected )
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Current Rating AC input
DC input
0.7A
4.0A
@AC 100-240V
@DC 12.0V
Dimensions Net
Gross
436 (W) x 462 (H) x 181 (D) mm
565 (W) x 525 (H) x 260 (D) mm
Weight Net
Gross
6.9Kg
10.6Kg
Environmental
Conditions
Operating Temperature
Operating Humidity
Storage Temperature
Storage Humidity
0 to 50°C (PANEL SURFACE)
20 to 80% ( no condensation, < wetbulb
29 degree C )
-20 to 60°C
5 to 85% ( no condensation, < wetbulb
29 degree C )
Accessories AC power cord-UL
AC power cord-Schuko
Analog VGA cable
Audio cable
Viewsonic CD-Wizard
1.8m
1.8m
1.8m
1.8m
1
1
Regulatory
Standards
UL, CSA or cUL, CB Report, CE, FCC-B, DOC-B, TUV/Ergo
(which covers ISO13406-2 and MPRIII), TUV/GS, PCT
(GOST-R) with 20 Hygienic certificates, PCBC (B Mark),
SEMKO, DEMKO, FIMKO, NEMKO, BSMI, VCCI, CCIB/EMC,
CCEE, PSB (Singapore Safety), TCO’95, NOM and Argentina
IRAM (thru TUV).
Osd Language English, French, German,Spanish, Italian, Suomi
Others Tilt Angle 20° up / 5° down
Power Saving System
User Control by touch sensor keypad with On Screen Display-
VESA DDC1/2B compatible ( digital port DDC2B only)
3. Electrical Characteristics
3.1 Power Supply
3.1.1 AC Input (AC Adapter)
Input Voltage AC90-264V
Frequency 47 / 63Hz
Power Consumption:
60 W (typ) on mode
less than 3W power save mode ( audio cable not
connected )
Current Rating 0.7A @ AC100-240V
3.1.2 DC Input
Input Voltage DC 12 V
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Current Rating 4.0A
3.2 LCD
LCD Chi-Mei panel(TFT-MVA)
Effective display size 357.12 (H) x 285.696 (V) mm (typ)
18.0” / 46 cm diagonal
Pixel number 1280 x 1024 pixels
Color filter arrangement R.G.B. vertical stripe
Display method TFT, normally black
Drive method Active matrix (TFT) - MVA
Dot pitch 0.093 (H) x 0.279 (V) mm
Pixel pitch 0.279 (H) x 0.279 (V) mm
Dot number 1280 x 1024 x 3 dots
Backlight Edge-lighting type with 6 CCFLs
(Cold Cathode Fluorescent Tube)
Brightness 250 cd/m2(typ),200 cd/m2(min: center / all white)
Contrast ratio 600 :1 (max), 400:1(typ), 300:1(min)
Display color 16,777,216
Minimum viewing angle Up 80° / down 80° / right 80° / left 80°
(Contrast ratio>10 at Ta=25°C, 77°F)
Response time 30 msec (Typical at 25 degree C)
3.3 Interface Signals
3.3.1 RGB Video Signals
3.3.1.1 Separate Sync . Signals
Analog R,G,B 0 - 0.7 Vp-p
Signal Level 75Ө± 5%
Sync Level TTL level
Sync Polarity independent
3.3.1.2 Sync On green, Composite Sync
3.3.2 Audio spec.
3.3.2.1 Line input connection
3.5 mm stereo jack x 1
3.3.2.2 Line input signal & impedance
1.0 Vrms, 10 kOhm
3.3.2.3 OUTPUT SIGNAL AT SPEAKER TERMINAL
Vp-p(out) >= 5 Vp-p @ < 10 % distortion
3.3.2.4 Frequency Response
300 Hz – 20 Khz
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3.3.2.5 Connector PC99 requirement Audio in
Lime Green pantone # 577C
3.3.2.6 Cable length
1.8 m
3.3.2.7 Audio DPMS
Speakers stay on when the rest of the monitor is in power saving.
3.3.2.8 Speakers
Impedance 4 Ohm
Output Wattage 3.0W(max.) x 2
3.3.3 Input Signal Connectors
3.3.3.1 Analog RGB Video Input : 15 pin mini D-sub
PIN NO. Separate Sync
1 RED
2 GREEN
3 BLUE
4 GROUND
5 GROUND
6 GROUND
7 GROUND
8 GROUND
9 +5V
10 GROUND
11 N.C
12 SDA
13 H.SYNC
14 V.SYNC
15 SCL
15
10
5 1
6
11
3.3.3.2 Audio Connector
3.5 mm Stereo jack x 1,
3.5mm Microphone jack x 1
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3.3.4 Signal Timing
3.3.4.1 User Timing Mode memory
always do auto image adjust after timing mode change
3.3.4.2 Timing mode Change
maximum time for mode Change with auto image adjust 7 sec.
3.3.4.3 Signal Timing Table
The factory test input video signal is defined as the following table:
Preset H.sync V.sync SYNC POL. Video Mode Description
No. Frequency Frequency H-
SYNC
V-
SYNC
MOD [1] 31.468 1.0KHz 70.0 1.0Hz + - 640X350(70) Text mode
MOD [2] 31.468 1.0KHz 70.0 1.0Hz - + 720X400(70) Dos text
MOD [3] 31.468 1.0KHz 59.94 1.0Hz - - 640X480(60) VESA STANDARD
MOD [4] 35.01 1.0KHz 66.67 1.0Hz - - 640X480(66) MAC
MOD [5] 37.86 1.0KHz 72.81 1.0Hz - - 640X480(72) VESA STANDARD
MOD [6] 37.5 1.0KHz 75.0 1.0Hz - - 640X480(75) VESA STANDARD
MOD [7] 43.27 1.0KHz 85.0 1.0Hz - - 640X480(85) VESA STANDARD
MOD [8] 35.16 1.0KHz 56.25 1.0Hz + + 800X600(56) VESA STANDARD
MOD [9] 37.88 1.0KHz 60.32 1.0Hz + + 800X600(60) VESA STANDARD
MOD [10] 48.077 1.0KHz 72.19 1.0Hz + + 800X600(72) VESA STANDARD
MOD [11] 46.875 1.0KHz 75.0 1.0Hz + + 800X600(75) VESA STANDARD
MOD [12] 53.67 1.0KHz 85.0 1.0Hz + + 800X600(85) VESA STANDARD
MOD [13] 49.72 1.0KHz 74.5 1.0Hz - - 832X624(75) MAC
MOD [14] 48.363 1.0KHz 60.0 1.0Hz - - 1024X768(60) VESA STANDARD
MOD [15] 58.01 1.0KHz 72.08 1.0Hz - - 1024X768(72) VESA STANDARD
MOD [16] 60.023 1.0KHz 75.0 1.0Hz + + 1024X768(75) VESA STANDARD
MOD [17] 68.67 1.0KHz 85.0 1.0Hz + + 1024X768(85) VESA STANDARD
MOD [20] 63.981 1.0KHz 60.02 1.0Hz + + 1280X1024(60) VESA STANDARD
MOD [21] 79.976 1.0KHz 75.0 1.0Hz + + 1280X1024(75) VESA STANDARD
3.4 Luminance Control
Analog signal (6500K)
over 200 cd / m2(@ Cont / Bright max)
3.5. Synchronization
Horizontal: 30 to 82 kHz
Vertical: 50 to 85 Hz Non-interlaced
maximum 75Hz @ 1280 x 1024 mode
Recommended 60Hz @ 1280 x 1024 mode
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