ViewSonic VG800-2 Manuel utilisateur

Service Manual

Model No. VLCDS23896-5W

18” Color TFT LCD Display

ViewSonic VG800b

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

VG800b-1_SM_606 - Rev. 1a – Oct 2002)

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

ViewSonic Corporation iConfidential – Do Not Copy VG800b

TABLE OF CONTENTS

1..

SPECIFICATIONS

..............................................................................1.

2. ..................................................................................................2-32

3. CIRCUIT DESCRIPTIONS....................................................................................33-49

4. ADJUSTMENT........................................................................................................50-54

MECHANICAL ASSEMBLY...................................................................................55-59

6. SPARE PARTS LISTS.......................................................................................60-78

7.SCHEMATIC DIAGRAMS.......................................................................................80-88

ViewSonic Corporation iii Confidential – Do Not CopyVG800b

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)

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

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

5 1

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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