Viewsonic VA930-1 Service Manual 1a
Service Manual
ViewSonic VA930-1
Model No. VLCDS24020-1W
19” Color TFT LCD Display
LOCATION OF CONTROLS
3.
ViewSonic
(VA930-1_SM_584-Rev. 1.0-September 2002)
381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
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 9/4/02 Initial Reversion DCN-2433 K.Yang
1b 11/05/02 Revise DCN-2433 C.Shen
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TABLE OF CONTENTS
PRECAUTIONS AND NOTICES...............................................................................1
1.
SPECIFICATIONS ....................................................................................................2
2.
LOCATION OF CONTROLS.....................................................................................3
3.
ADJUSTING PROCEDURE......................................................................................4
4.
5. BLOCK DIAGRAM....................................................................................................9
6. TROUBLE SHOOTING FLOW CHART...................................................................11
7. SPARE PARTS LIST...............................................................................................15
8. EXPLODED DIAGRAM AND SPARE PARTS LIST................................................26
SCHEMATIC DIAGRAMS........................................................................................28
9.
10. PCB LAYOUT DIAGRAM........................................................................................38
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PRECAUTIONS AND NOTICES
1.
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.
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Specifications
1.
SPECIFICATIONS
2.
LCD panel type
Power Consumption
Displayable Resolution
Pixel dimension
Display Color
Viewing Angle
(CR=10)
Response Time
Contrast Ratio
Brightness
Active Display Area
AC/DC adapter
Dimensions ( WxHxD )
19.0” TFT(Fujitsu)
48 W (typ)
SXGA 1280 x 1024 maximum
0.294 mm x 0.294 mm
16.7 M
Horizontal: ±85
Vertical: ±85
25 ms typ.
500:1 typ.
250 cd / m2 typ.
376 mm horizontal x 301mm vertical
Input:AC 100~264V,47~63 Hz
Output:+12V DC.
439 mm(W) x 465mm(H) x 180mm(D)
q
q
Weight
Input connector
Power management
Temperature
7.5 kg (unit)
15 Pin D-Sub.
YES
Operating : 0°C ~ +40°C
Storage : -20°C ~ +60°C
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LOCATION OF CONTROLS
3.
LOCATION OF CONTROLS
3.
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ADJUSTING PROCEDURE
4.
The " adjusting procedure" of VA930 model
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 lights up with orange and change to green color during reset procedure.
8. OSD changes into a message for "Auto Image Adjust", it disappears after reset procedure.
9. After that the input video signal is showed on display.
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BLOCK DIAGRAM
5.
INTERFACE BOARD(DPWBN5419T8---A)
COMPUTER
GRAPHIC
W1
(DB15)
A/D
CONVERTER
SCALER
SD1210-2
(U8)
AD9883
(U3)
DDC
EPROM
24C21A
(U5)
Serial
EEPROM
24C16
(U17)
12V
3.3V
5V
X1
OSC
MPU
(U15)
MTV230P
PLL
U12
JP3
Serial
EEPROM
24C16
(U9)
INVERTER
SWITCH MODE
POWER SUPPLY
JP2
TO
FROM
A/D ADAPTOR
JP7
SW BOARD
DPWBN5418T8----
CON4
5CON
CON1
INVERTER
RUNTP5392T8----
CON2
CON3
AUDIO BOARD
DPWBN5417T8----
19” LCD
PANEL
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Does
A
picture
display
NO
Back-light
On or off?
OFF
Check
power
LED
ORANGE
YES
6. TROUBLE SHOOTING FLOW CHART
ON
GREEN
dark picture
or a picture
full of
colored
vertical lines
Hsync,Vsync
Or DE error
Check display
resolution
Check I/F board
OSD no response
Picture dim
The brightness is
different between upper
and lower side of panel
Picture without color
Vertical, Horizontal
Out of sync
Check inverter
Check I/F board JP1
Check SW board S1~S4
Check OSD adjustment
Check inverter
Check backlight
Check signal cable
RGB signal
error
Check I/F board
Check LCD panel
Check LCD cable
Check I/F board JP4
Check LCD panel
J1,J2,J3
Check I/F board
Check SW board
J1
Check inverter
Check I/F board
One or more colored
vertical lines
Check LCD panel
Even (or odd) vertical
line is dark
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H,V sync
error
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POWER CKT
START
YES
CHECK 5V,3.3VB,
LCD_VCC & 3V3_MCU
NO
CHECK POWER CKT
(12V,+5V & 3.3V CKT)
POWER CKT
YES
END
YES
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ADC CKT
START
YES
REPLACE U3
OK
YES
Check U3 O/P
& VCLK00
CHECK I/P R,G & B Video,
HSYNC(pin 30),Coast(pin 31) AND
I2C BUS Signal
CHECK MCU CKT(I2C
BUS),D_SUB connector
And U2(74LV14)
SIGNAL
NO
NO
YES
TO SD1210 CKT
ADC CKT
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MCU CKT START
YES
YES
OK
CHECK MCU_I2C(pin
31;32),ROM I2C(pin
27;28),ASIC I2C(pin
25;26) AND OUTPUT
SIGNAL
NO
CHECK U15 RESET(pin
19),12MHZ(Pin7,8),H_sync
(pin 14)&V_sync(pin13)
SIGNAL
NO
CHECK U15 F/W
OR REPLACE
YES
END
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MCU CKT
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