ViewSonic VS10725, VP930/b Service Manual

Model No. VS10725

19” Color TFT LCD Display

Service Manual

ViewSonic VP930/b

ViewSonic



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

(VP930/b_SM Rev. 1a Oct. 2005)

Copyright

Copyright

¤

2005 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.

Optiquest is a registered trademark of ViewSonic Corporation.

Revision History

ECR Number

Description of Changes

EditorRevision SM Editing Date

1a

Initial Release

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ViewSonic Corporation Confidential

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G. Han

10/19/05

TABLE OF CONTENTS

2. Specification

3. Front Panel Function Control Description

4. Circuit Description

6. Troubleshooting Flow Chart

9. Block Diagram

10. Schematic Diagrams

7. Recommended Spare Parts List

1. Precautions and Safety Notices

5. Adjustment Procedure

8. Exploded Diagram and Exploded Parts List

11. PCB Layout Diagrams

1
5

10

17
18
30

35
43

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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.

1. Precautions and Safety Notices

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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:

Incorrect 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.

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

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

VIDEO INTERFACE

Input Connector

D-SUB1= DB-15(Analog)
D-SUB2= DB-15(Analog)
DVI= DVI-D(Digital)

Default Input Connector Defaults to the first detected input

Video Cable Strain Relief

Equal to twice the weight of the monitor for

five minutes
Video Cable Connector DB-15 Pin
out

Compliant DDC 2B

Video Signals

Video RGB (Analog)

Separate Sync / Composite Sync / SOG

TMDS (Digital)
Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)
Maximum PC Video Signal 950 mV with no damage to monitor
Maximum Mac Video Signal 1250 mV with no damage to monitor
Sync Signals TTL
DDC/CI Compliant with Revision 1.0

Sync Compatibility

Separate Sync / Composite Sync / SOG

Video Compatibility

Shall be compatible with all PC type

computers, Macintosh computers, and

after market video cards

Resolution Compatibility

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, 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

1 640 x 350 @ 70 Hz, 31.5 KHz

Yes Yes DMT

2 640 x 400 @ 60 Hz, 31.5 KHz

Yes Yes DMT

3 640 x 400 @ 70 Hz, 31.5 KHz

Yes Yes DMT

4 640 x 480 @ 50 Hz, 24.7 KHz

Yes Yes DMT

5 640 x 480 @ 60 Hz, 31.5 KHz

Yes Yes DMT

6 640 x 480 @ 67 Hz, 35.0 KHz

Yes Yes For MAC

7 640 x 480 @ 72 Hz, 37.9 KHz

Yes Yes DMT

8 640 x 480 @ 75 Hz, 37.5 KHz

Yes Yes DMT

9 640 x 480 @ 85 Hz, 43.3 KHz

Yes Yes DMT

10 640 x 870 @ 75 Hz, 68.9 KHz

Yes Yes MAC

11 720 x 400 @ 70 Hz, 31.5 KHz

Yes Yes DMT

12 720 x 400 @ 85 Hz, 37.9 KHz

Yes Yes DMT

13 720 x 480 @ 60 Hz, 31.5 KHz

Yes Yes 480p

14 720 x 576 @ 50 Hz, 31.3 KHz

Yes Yes 576p

15 800 x 600 @ 50 Hz, 24.7 KHz

Yes Yes DMT

16 800 x 600 @ 56 Hz, 35.1 KHz

Yes Yes DMT

17 800 x 600 @ 60 Hz, 37.9 KHz

Yes Yes DMT

18 800 x 600 @ 72 Hz, 48.1 KHz

Yes Yes DMT

19 800 x 600 @ 75 Hz, 46.9 KHz

Yes Yes DMT

20 800 x 600 @ 85 Hz, 53.7 KHz

Yes Yes DMT

21 832 x 624 @ 75 Hz, 49.7 KHz

Yes Yes MAC

22 1024 x 768 @ 50 Hz, 39.6 KHz

Yes Yes DMT

23 1024 x 768 @ 60 Hz, 48.4 KHz

Yes Yes DMT

24 1024 x 768 @ 70 Hz, 56.5 KHz

Yes Yes DMT

25 1024 x 768 @ 72 Hz, 58.1 KHz

Yes Yes DMT

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26 1024 x 768 @ 75 Hz, 60.0 KHz

Yes Yes DMT

27 1024 x 768 @ 75 Hz, 60.2 KHz

Yes Yes For MAC

28 1024 x 768 @ 85 Hz, 68.7 KHz

Yes Yes DMT

29 1152 x 864 @ 75 Hz, 67.5 KHz

Yes Yes DMT

30 1152 x 870 @ 75 Hz, 68.7 KHz

Yes Yes For MAC

31 1280 x 720 @ 50 Hz, 37.5 KHz

Yes Yes 720p

32 1280 x 720 @ 60 Hz, 45.0 KHz

Yes Yes 720p

33 1280 x 768 @ 50 Hz, 39.6 KHz

Yes Yes DMT

34 1280 x 768 @ 60 Hz, 47.4 KHz

Yes Yes DMT

35 1280 x 768 @ 60 Hz, 47.8 KHz

Yes Yes DMT

36 1280 x 768 @ 75 Hz, 60.3 KHz

Yes Yes DMT

37 1280 x 768 @ 85 Hz, 68.6 KHz

Yes Yes DMT

38 1280 x 960 @ 50 Hz, 49.4 KHz

Yes Yes DMT

39 1280 x 960 @ 60 Hz, 59.7 KHz

Yes Yes DMT

40 1280 x 960 @ 75 Hz, 75.2 KHz

Yes Yes DMT

41 1280 x 1024 @ 50 Hz, 52.7 KHz

Yes Yes DMT

42 1280 x 1024 @ 60 Hz, 64.0 KHz

Yes Yes DMT

43 1280 x 1024 @ 75 Hz, 80.0 KHz

Yes Yes DMT

User Presets

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

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Panel Characteristics

Model number AUO M190EN03 V.0/V.2
Type Active Matrix TFT, PMVA technology
Active Size 19”
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.294 mm
Glass Treatment Anti Glare
# of Backlights 4 CCFL
Backlight Life 50,000 Hours (Typ)

40,000 Hours (Min)

Luminance (Center)– CT =

6500K, Contrast / Brightness =

250 cd/m2 (Typ after 30 minute warm up)

200 cd/m2 (Min after 30 minute warm up)
Brightness Uniformity 80%(Typ) / 75%(Min)
Contrast Ratio 1000:1 (Typ), 500:1 (Min)
Color Depth 16.7 million colors (8 bit panel)
Horizontal Viewing Angle 170 degress (Typ) @ CR>10

Vertical Viewing Angle 170degress (Typ) @ CR>10

Response Time
10%-90% @ Ta=25°C

On/Off

Typical= 20 ms (Tr= 13 ms, Tf = 7 ms)

GTG

8 ms (Avg)

Mercury

3.0 mg per lamp

Panel Defects Please see Panel Quality Specifications.

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IMAGE PERFORMANCE

Factory Defaults

Item Defaults Item Defaults
Contrast 70% 720x400/640x400 720x400
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

Width 412 mm (16.2 “)
Height (adjust to the top/bottom) 356 mm (14”) / 491mm(19.3”
Depth 289 mm (11.4”)
Monitor Weight 6.8 kg (15 lbs)

Dimension (Head Only / Wall Mount)

Width 412 mm (16.2”)
Height 336 mm (13.2”)
Depth 61 mm (2.4”)
Monitor Weight 4.2 kg (9.3 lbs)

Ergonomics

Tilt Up 20º≧
Tilt Down From 0º down to -3º ~ -5 º
Swivel Right 135º≧
Swivel Left 135º≧
Height Adjust 0 135 mm≧
Pivot 0~90 degress (clockwise)

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3. Front Panel Function Control Description

3.1 Location of Controls

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Hot Key for Function Controls

Buttons: Functions:

[1] Main menu
[2] Input Select

[Up] or [Dn]

To immediately activate Contrast menu. It should

be change to Brightness OSD by push button [2]

[Up] + [Dn] Recall both of Contrast and Brightness to default

[1] + [2] Toggle 720x400 and 640x400 mode when input

720x400 or 640x400 mode.

[1] + [Up] + [Dn] Auto White Balance.(Not shown on user’s guide)

[1] + [Dn] Power Lock
[1] + [Up] OSD Lock

[1] + [Dn] + [2] Didable Theft Defence function

[Up] + [PW] + Main

Power On

All reset

No signal + [PW] +[2] +

Main Power on

Burning mode

Signal + [PW] +[2]

+ Main

Power on

Factory Mode

Remark : All the short cuts function are only available while OSD off

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4. Circuit Description

1. WORKING THEOREM

A. Scaler

The TSU66AJ is total solution graphics processing IC for LCD monitors with panel
resolutions up to SXGA. It is configured with a high-speed integrated triple-ADC/PLL, an
integrated DVI receiver, a high quality display processing engine, and an integrated output
display interface that can support LVDS panel interface format. To further reduce system
costs, the TSU66AJ also integrates intelligent power management control capability for
green-mode requirements and spread-spectrum support for EMI management. The
TSU66AJ incorporates the world’s first coherent oversampled RGB graphics ADC in a
monitor controller system1. The oversampling ADC samples the input RGB signals at a
frequency that is much higher than the signal source pixel rate. This can preserve details in
the video signal that ordinarily would be lost due to input signal jitter or bandwidth limitations
in non-oversampled systems. The TSU66AJ also incorporates a new Dynamic Frame Rate
(DFR) generator2 for the digital output video to the display panel that preserves the
advantages of a fixed output clock rate, while eliminating the output end of frame short-line.

??

B. MCU:

The MTV416M micro-controller is an 8051 CPU core embedded device targeted for LCD
Monitor or LCD TV application. It includes an 8051 CPU core, a 128K-byte internal
program Flash-ROM, a 768-byte SRAM, 4 channels of PWM DAC, 4 channels of 6-bit
ADC, and a built-in sync-processor. It also includes two IIC Slave B ports, supporting
VESA DDC/CI for both D-sub and DVI interfaces, and a Boot-Code-Free ISP (In System
Programming).

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