ViewSonic VG900b-1 User manual

Service Manual

ViewSonic VG900b-1

(VG900b-1_SM_575-Rev. 1.0-October 2002)

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

Model No. VLCDS24020-2W

19” Color TFT LCD Display

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 10/2/02 Initial Reversion DCN-2351 K.Yang

ViewSonic Corporation iConfidential – Do Not Copy VG900b-1

1b 11/11/02 Revise DCN-2351 C.Shen

TABLE OF CONTENTS

ViewSonic Corporation ii Confidential – Do Not Copy VG900b-1

1. PRECAUTIONS AND NOTICES...............................................................................1

2. SPECIFICATIONS ....................................................................................................2

3. LOCATION OF CONTROLS.....................................................................................3

5. BLOCK DIAGRAM....................................................................................................9

6. TROUBLE SHOOTING FLOW CHART...................................................................11

7. SPARE PARTS LIST...............................................................................................15

8. EXPLODED DIAGRAM AND SPARE PARTS LIST................................................23

9.SCHEMATIC DIAGRAMS........................................................................................25

10.PCB LAYOUT DIAGRAM........................................................................................35

4.ADJUSTING PROCEDURE......................................................................................4

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.

Read all of these instructions.

Save these instructions for later use.

Follow all warnings and instructions marked on the product.

Do not use this product near water.

This display should be installed on a solid horizontal base.

When cleaning, use only a neutral detergent cleaner with a soft damp cloth. Do not spray with liquid or

aerosol cleaners.

Do not expose this display to direct sunlight or heat. Hot air may cause damage to the cabinet and other

parts.

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.

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.

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 must not be blocked or

covered. Those openings should never be blocked by placing this 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.

ViewSonic Corporation 1Confidential – Do Not Copy VG900b-1

2. SPECIFICATIONS

1. Specifications

LCD panel type 19.0”TFT(Fujitsu)

Power Consumption 48 W (typ)

Displayable Resolution SXGA 1280 x 1024 maximum

Pixel dimension 0.294 mm x 0.294 mm

Display Color 16.7 M

Viewing Angle

(CR=10)

Horizontal: ±85q

Vertical: ±85q

Response Time 25 ms typ.

Contrast Ratio 500:1 typ.

Brightness 250 cd / m2typ.

Active Display Area 376 mm horizontal x 301mm vertical

AC/DC adapter Input:AC 100~264V,47~63 Hz

Output:+12V DC.

Dimensions ( WxHxD ) 439 mm(W) x 465mm(H) x 180mm(D)

Weight 7.5 kg (unit)

Input connector 15 Pin D-Sub.

Power management YES

Temperature

Operating : 0°C ~ +40°C

Storage : -20°C ~ +60°C

ViewSonic Corporation 2Confidential – Do Not Copy VG900b-1

3. LOCATION OF CONTROLS

ViewSonic Corporation 3Confidential – Do Not Copy VG900b-1

The " adjusting procedure" of VG900bmodel

1. Turn off the display by power button key on the front of bezel,

2. Disconnect the DC power cable from power jack at rear side.

3. Press and hold the “Ÿ” button key on the front of the bezel

4. Connect the power cable with power jack, and keep pressing the “Ÿ” button key.

5. Press the power button key to turn the display on, and then release the “Ÿ” and power button.

6. The unit is set into Reset mode, OSD main window will be shown on the display,

you can see a red message for “ALL RESET” with a red frame inside OSD windows.

7. The LED lightsup with orange and change to green color during reset procedure.

8. OSD changesinto a message for "Auto Image Adjust", it disappearsafter reset procedure.

9. The input video signal is shownon display.

4. ADJUSTING PROCEDURE

ViewSonic Corporation 4Confidential – Do Not Copy VG900b-1

5.BLOCK DIAGRAM

FROM

A/D ADAPTOR

INTERFACE BOARD(DPWBN5419T8---A)

COMPUTER

GRAPHIC

12V

3.3V

(DB15)

A/D

CONVERTER

AD9883

(U3)

SCALER

SD1210-2

(U8)

DDC

EPROM

24C21A

(U5)

Serial

EEPROM

24C16

(U17)

MPU

(U15)

MTV230P

Serial

EEPROM

24C16

(U9) JP2

INVERTER

JP3 SWITCH MODE

POWER SUPPLY

19” LCD

PANEL

SW BOARD

DPWBN5418T8----

INVERTER

RUNTP5392T8----

CON1

CON4

5CON CON2

CON3

JP7

OSC PLL

U12

AUDIO BOARD

DPWBN5417T8----

ViewSonic Corporation 5Confidential – Do Not Copy VG900b-1

YES

OFF

GREEN

Hsync,Vsync

Or DE error

ORANGE

OSD no response

Picture too dim

The brightness is

different between upper

and lower side of panel

Picture without

Color

Vertical, Horizontal

Out of sync

One or more colored

vertical lines

Even (or odd) vertical

line is dark

Does

picture

display

Back-light

On or off?

dark picture

full of

colored

vertical lines

Check

power

LED

Check display

resolution Check inverter

Check I/F board JP1

Check LCD cable

Check I/F board JP4

Check LCD panel

J1,J2,J3

Check I/F board

Check SW board S1~S4

Check OSD adjustment

Check inverter

Check backlight

Check signal cable

Check I/F board

Check LCD panel

Check I/F board

Check SW board

Check inverter

Check I/F board

RGB signal

error

H,V sync

error

or a picture

6.TROUBLE SHOOTING FLOW CHART

ViewSonic Corporation 6Confidential – Do Not Copy VG900b-1

YES

CHECK 5V,3.3VB,

LCD_VCC & 3V3_MCU

START

POWER CKT

(12V,+5V & 3.3V CKT)

POWER CKT

CHECK POWER CKT

END

ViewSonic Corporation 7Confidential – Do Not Copy VG900b-1

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