Viewsonic VP930B-2, VP930-2 Service Manual

Service Manual

ViewSonic VP930-2

VP930b-2

Model No. VS10725

19” Color TFT LCD Display

ViewSonic

(VP930-2_VP930b-2_SM Rev. 1a Mar. 2006)



381 Brea Canyon Road, Walnut, California 91789 USA - [phone]

Copyright

Copyright
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.

2006 by ViewSonic Corporation. All rights reserved. No part of this publication may be

¤

1a

Revision History

ECR Number

03/20/06

Initail Release

Description of Changes

EditorRevision SM Editing Date

Jamie Chang

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TABLE OF CONTENTS

1. Precautions and Safety Notices

2. Specification

3. Front Panel Function Control Description

4. Circuit Description

5. Adjustment Procedure

6. Troubleshooting Flow Chart

7. Recommended Spare Parts List

8. Exploded Diagram and Exploded Parts List

9. Block Diagram

10. Schematic Diagrams

11. PCB Layout Diagrams

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1. Precautions and Safety Notices

1. Appropriate Operation

(1) Turn off the product before cleaning.
(2) Use only a dry soft cloth when cleaning the LCD panel surface.
(3) Use a soft cloth soaked with mild detergent to clean the display housing.
(4) Use only a high quality, safety approved AC/DC power cord.
(5) Disconnect the power plug from the AC outlet if the product will not be used for a long period of time.
(6) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display off.
(7) Do not touch the LCD panel surface with sharp or hard objects.
(8) Do not place heavy objects on the LCD display, video cable, or power cord.
(9) Do not use abrasive cleaners, waxes or solvents for your cleaning.
(10) Do not operate the product under the following conditions:

- Extremely hot, cold or humid environment.

- Areas containing excessive dust and dirt.

- Near any appliance generating a strong magnetic field.

- In direct sunlight.

2. Caution

No modification of any circuit should be attempted. Service work should only be performed after you are thoroughly familiar

with all of the following safety checks and servicing guidelines.

3. Safety Check

Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit, the voltage is

exposed in such areas as the associated transformer circuits.

4. LCD Module Handling Precautions

4.1 Handling Precautions

(1) Since front polarizer is easily damaged, pay attention not to scratch it.
(2) Be sure to turn off power supply when connecting or disconnecting input connector.
(3) Wipe off water drops immediately. Long contact with water may cause discoloration or spots.
(4) When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth.
(5) Since the panel is made of glass, it may break or crack if dropped or bumped on hard surface.
(6) Since CMOS LSI is used in this module, take care of static electricity and ensure human earth when handling.
(7) Do not open or modify the Module Assembly.
(8) Do not press the reflector sheet at the back of the module in any direction.
(9) In the event that a Module must be put back into the packing container slot after it was taken out of the

container, do not press the center of the CCFL Reflector edge. Instead, press at the far ends of the
CFL Reflector edge softly. Otherwise the TFT Module may be damaged.

(10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate or tilt the Interface

Connector of the TFT Module.

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(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist or

bend the TFT Module even momentarily. When designing the enclosure, it should be taken into consideration
that no bending/twisting forces may be applied to the TFT Module from outside. Otherwise the TFT Module
may be damaged.

(12) The cold cathode fluorescent lamp in the LCD contains a small amount of mercury. Please follow local

ordinances or regulations for disposal.

(13) The LCD module contains a small amount of materials having no flammability grade. The LCD module

should be supplied with power that complies with the requirements of Limited Power Source
(IEC60950 or UL1950), or an exemption should be applied for.

(14) The LCD module is designed so that the CCFL in it is supplied by a Limited Current Circuit (IEC60950

or UL1950). Do not connect the CCFL to a Hazardous Voltage Circuit.

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Correct Methods:

Only touch the metal frame of the LCD
panel or the front cover of the monitor.Do
not touch the surface of the polarizer.

Incorrect Methods:
Surface of the LCD panel is pressed by

fingers and that will probably cause
“Mura”.

Take out the monitor with cushions

Taking out the monitor by grasping the
LCD panel.That will probably cause
“Mura”.

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Place the monitor on a clean and soft

foam pad.

Placing the monitor on foreign objects.
That will probably scratch the surface
of the panel or cause “Mura.”

The panel is placed facedown on

the lap. That will probably cause
“Mura.”

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2.SPECIFICATIONS

GENERAL specification

Test Resolution & Frequency 1280x1024 @ 60Hz
Test Image Size Full Size

Contrast and Brightness Controls

VIDEO INTERFACE

Input Connector (refer the appendix A) D-Sub1 = DB-15 (Analog)

Default Input Connector Defaults to the first detected input

Video Cable Strain Relief

Video Cable Connector DB-15 Pin out

Video Signals

Video Impedance
Maximum PC Video Signal
Maximum Mac Video Signal
Sync Signals
DDC/CI
Sync Compatibility

Video Compatibility

Factory Default:
Contrast = 70%, Brightness = 100%

D-Sub2 = DB-15 (Analog)
DVI-D = DVI-I (Digital)

Equal to twice the weight of the monitor for
five minutes

Compliant DDC/CI
Video RGB (Analog)

Separate Sync / Composite Sync / SOG
TMDS (Digital)
75 Ohms (Analog), 100 Ohms (Digital)
950 mV with no damage to monitor
1250 mV with no damage to monitor
TTL
Compliant with Revision 1.0
Separate Sync / Composite Sync / SOG
Shall be compatible with all PC type

computers, Macintosh computers, and after
market video cards

640 x 350, 640 x 400, 640 x 480, 640 x 870,
720 x 400, 720 x 480, 720 x 576, 800 x 600,
832 x 624, 1024 x 768, 1152 x 864, 1152 x
870, 1280 x 720, 1280 x 768, 1280 x 960,

Resolution Compatibility

1280 x 1024

Exclusions Not compatible with interlaced video

Horizontal / Vertical Frequency

Horizontal Frequency 24 – 82 KHZ
Vertical Refresh Rate 50 – 85 HZ
Maximum Pixel Clock 135 MHz
Sync Polarity Independent of sync polarity

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Table : 15 pin D-sub connector pin assignment

Pin Number Pin Function

1 Red video input
2 Green video input
3 Blue video input
4 No Connection
5 Ground
6 Red video ground
7 Green video ground
8 Blue video ground

9 +5V
10 Ground
11 No connection
12 (SDA)
13 Horizontal sync (Composite sync)
14 Vertical sync
15 (SCL)

Timing Table

Item Timing Analog Digital Remark

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2
3
4
5
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7
8
9

10

11

12
13
14
15

640 x 350 @ 70 Hz, 31.5 KHz Yes Yes DMT;
640 x 400 @ 60 Hz, 31.5 KHz Yes Yes DMT
640 x 400 @ 70 Hz, 31.5 KHz Yes Yes DMT
640 x 480 @ 50 Hz, 24.7 KHz Yes Yes DMT
640 x 480 @ 60 Hz, 31.5 KHz Yes Yes DMT;
640 x 480 @ 67 Hz, 35.0 KHz Yes Yes For MAC
640 x 480 @ 72 Hz, 37.9 KHz Yes Yes DMT
640 x 480 @ 75 Hz, 37.5 KHz Yes Yes DMT
640 x 480 @ 85 Hz, 43.3 KHz Yes Yes DMT
640 x 870 @ 75 Hz, 68.9 KHz Yes Yes MAC
720 x 400 @ 70 Hz, 31.5 KHz

Separate

Only

Yes DMT

720 x 480 @ 60 Hz, 31.5 KHz Yes Yes DMT
720 x 576 @ 50 Hz, 31.3 KHz Yes Yes DMT”
800 x 600 @ 56 Hz, 35.1 KHz Yes Yes DMT
800 x 600 @ 60 Hz, 37.9 KHz Yes Yes DMT

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*1. Tolerance ≧ ±2KHz.
*2. Any timing not in the list, it should display as normal or show on “OUT OF RANGE” OSD message

without blanking.

*3. The image quality of 85Hz mode might be worse than 75Hz.

800 x 600 @ 72 Hz, 48.1 KHz Yes Yes DMT

800 x 600 @ 75 Hz, 46.9 KHz Yes Yes DMT

800 x 600 @ 85 Hz, 53.7 KHz Yes Yes DMT

832 x 624 @ 75 Hz, 49.7 KHz Yes Yes MAC
1024 x 768 @ 50 Hz, 39.6 KHz Yes Yes DMT;
1024 x 768 @ 60 Hz, 48.4 KHz Yes Yes DMT
1024 x 768 @ 70 Hz, 56.5 KHz Yes Yes DMT
1024 x 768 @ 72 Hz, 58.1 KHz Yes Yes DMT
1024 x 768 @ 75 Hz, 60.0 KHz Yes Yes DMT
1024 x 768 @ 75 Hz, 60.2 KHz Yes Yes For MAC
1024 x 768 @ 85 Hz, 68.7 KHz Yes Yes DMT
1152 x 864 @ 75 Hz, 67.5 KHz Yes Yes DMT
1152 x 870 @ 75 Hz, 68.7 KHz Yes Yes For MAC
1280 x 720 @ 50 Hz, 37.5 KHz Yes Yes 720p
1280 x 720 @ 60 Hz, 45.0 KHz Yes Yes 720p
1280 x 768 @ 50 Hz, 39.6 KHz Yes Yes DMT
1280 x 768 @ 60 Hz, 47.8 KHz

1280 x 768 @ 75 Hz, 60.3 KHz

1280 x 768 @ 85 Hz, 68.6 KHz

Separate

Only

Separate

Only

Separate

Only

Yes DMT;

Yes DMT;

Yes DMT;”

1280 x 960 @ 50 Hz, 49.4 KHz Yes Yes DMT
1280 x 960 @ 60 Hz, 59.7 KHz Yes Yes DMT
1280 x 960 @ 75 Hz, 75.2 KHz Yes Yes DMT

1280 x 1024 @ 50 Hz, 52.7 KHz Yes Yes DMT
1280 x 1024 @ 60 Hz, 64.0 KHz Yes Yes DMT
1280 x 1024 @ 75 Hz, 80.0 KHz Yes Yes DMT

Primary Presets

1280x1024 @ 60Hz

User Presets

Number of User Presets (recognized timings) Available: 10 presets total in FIFO
configuration

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Panel Characteristics

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Source Panel

Model number AUO M190EN03 V.2
Type Active Matrix TFT, TN technology
Active Size 19”
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.294 mm
Glass Treatment Anti-Glare
# of Backlights 4 CCFL
Backlight Life 50000 Hrs (Typ)

CT = 6500K,
Contrast/ Brightness = Max

Brightness Uniformity 80 % (Typ) / 75 % (Min)
Contrast Ratio 1000 :1 (Typ)
750 : 1 (Min)
Color Depth 16.7 million colors (8 bit panel)

Horizontal Viewing Angle
Vertical Viewing Angle
Response Time
10%-90% @ Ta=25°C
Mercury

Panel Defects Please see Panel Quality Specifications.

30000 Hrs (Min)
250 cd/m2 (Typ after 30 minute warm up) Luminance (Center) –

200 cd/m2 (Min after 30 minute warm up)

170 degrees (Typ) / 150 degrees (Min) @ CR>10
130 degrees (Typ) / 110 degrees (Min) @ CR>10

GTG

8ms (Avg) / 16ms (Max)

3.0 mg per lamp

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IMAGE PERFORMANCE

Factory Defaults

Item Defaults Item Defaults

Contrast 70% Input Priority Auto Search
Brightness 100% Resolution Notice Enabled
Color Temperature 6500K Volume N/A
Sharpness 100% Balance N/A
OSD H. Position 50% Treble N/A
OSD V. Position 50% Bass N/A
OSD Time Out 15 Sec
OSD Background Enabled

Dimension (Desktop)

Width 412mm (16.2"
Height (Height adjust to the bottom) 356mm (14") / 491mm (19.3")
Depth 289mm (11.4"
Monitor Weight 6.8 Kg (15 lbs)
*Refer to Figure 1

Dimension (Head Only / Wall Mount)

Width 412mm (16.2"
Height 336mm (13.2"
Depth 61mm (2.4
Monitor Weight 4.2 Kg (9.3 lbs)
*Refer to Figure 1

Ergonomics

Tilt Up

≧ 20º

Tilt Down From 0º down to -3º ~ -5º
Swivel Right
Swivel Left
Height Adjust
Pivot 0~90 degrees (Clockwise)

≧ 135º
≧ 135º
0 ~ ≧ 135 mm

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3. Front Panel Function Control Description

3.1 Location of Controls

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