ViewSonic VS10805, VA905-1 Service Manual

Model No. VS10805

19” Color TFT LCD Display

Service Manual

ViewSonic VA905-1

ViewSonic



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

(VA905_SM Rev. 1a Jun. 2005)

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

Initial Release

A. Lu

ViewSonic Corporation Confidential

Do Not Copy VA905

06/16/05

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 Spare Parts List

11. PCB Layout Diagrams

1 5 8

15 16 32

36 43 50

ViewSonic Corporation Confidential

Do Not Copy VA905

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

ViewSonic Corporation Confidential

Do Not Copy VA905

(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.

ViewSonic Corporation Confidential

Do Not Copy VA905

5. Handling and Placing Methods

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 may cause ”Mura”.

Take out the monitor with cushions Taking out the monitor by grasping the LCD

panel. That may cause ”Mura”

ViewSonic Corporation Confidential

Do Not Copy VA905

Place the monitor on a clean and soft foam pad.

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

The panel is placed facedown on the lap. That may cause “Mura”.

ViewSonic Corporation Confidential

Do Not Copy VA905

2. Specification

1. General Requirements

General Specifications

Test Resolution & Frequency “1280 x 1024” @ 60Hz Test Image Size Full Size Contrast and Brightness Controls Factory Default:

Contrast = 70%, Brightness = 100%

2. Signal Interface

Video Interface

Analog Input Connector DB-15 (Analog) Digital Input Connector DVI-D (Digital) Default Input Connector Defaults to the first detected input Video Cable Connector DB-15 Pin out Compliant DDC 1/2B.

Video Signals

Video RGB (Analog) Separate Sync

2. TMDS (Digital)

Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)

Exclusions Not compatible with interlaced video.

3. Power

Power Supply

Input Voltage Range 90 to 264 VAC Power Dissipation 40 WATTS (TYP)

4. Electrical Requirements

Horizontal / Vertical Frequency

Horizontal Frequency 30 – 82 kHz Vertical Refresh Rate 50 – 85 HZ Maximum Pixel Clock 135 MHz Primary Preset “1280 x 1024” @ 60Hz

Look up table timing <<Analog>>

1. 640 x 350 @ 70Hz, 31.5kHz

2. 640 x 480 @ 60Hz, 31.5kHz

3. 640 x 480 @ 67Hz, 35.0kHz

4. 640 x 480 @ 75Hz, 37.5kHz

5. 640 x 480 @ 72Hz, 37.9kHz

6. 640 x 480 @ 85Hz, 43.27kHz

7. 720 x 400 @ 70Hz, 31.5kHz

8. 800 x 600 @ 56Hz, 35.1kHz

9. 800 x 600 @ 60Hz, 37.9kHz

10. 800 x 600 @ 75Hz, 46.9kHz

11. 800 x 600 @ 72Hz, 48.1kHz

12. 800 x 600 @ 85Hz, 53.7kHz

13. 832 x 624 @ 75Hz, 49.7kHz

14. 1024 x 768 @ 60Hz, 48.4kHz

15. 1024 x 768 @ 70Hz, 56.5kHz

16. 1024 x 768 @ 72Hz, 58.1kHz

17. 1024 x 768 @ 75Hz, 60.0kHz

18. 1024 x 768 @ 85Hz, 68.67kHz

19. 1280 x 1024 @ 60Hz, 63.4kHz

20. 1280 x 1024 @ 75Hz, 79.97kHz

<<Digital>> 640 x 350 @ 70Hz, 31.5kHz 640 x 400 @ 60Hz, 31.5kHz 640 x 480 @ 60Hz, 31.5kHz 640 x 480 @ 75Hz, 37.5kHz 640 x 480 @ 72Hz, 37.9kHz 640 x 480 @ 85Hz, 43.27kHz 720 x 400 @ 70Hz, 31.5kHz 800 x 600 @ 56Hz, 35.1kHz 800 x 600 @ 60Hz, 37.9kHz 800 x 600 @ 75Hz, 46.9kHz 800 x 600 @ 72Hz, 48.1kHz 800 x 600 @ 85Hz, 53.7kHz 1024 x 768 @ 60Hz, 48.4kHz 1024 x 768 @ 70Hz, 56.5kHz 1024 x 768 @ 72Hz, 58.1kHz 1024 x 768 @ 75Hz, 60.0kHz 1024 x 768 @ 85Hz, 68.67kHz 1280 x 1024 @ 60Hz, 63.4kHz

ViewSonic Corporation Confidential

Do Not Copy VA905

Changing Modes

Maximum Mode Change Blank Time for image stability. Note:

1) Excluding “Auto Adjust” time

2) Under DOS mode (640 x 350, 720 x 400 & 640 x 400), there is no “Auto Adjust” feature.

3) The monitor needs to do “Auto Adjust” the

first time a new mode is detected.

Under 5 seconds (Maximum) 1 seconds (Typ.) for recognized timings 1-2 seconds (Typ.) for unrecognized timing

5. Audio

Speaker Specification

Line input connection 3.5 mm stereo jack Line input signal 1.0Vrms Line input impedance 10K ohm Maximum power output (Electric) 2 W @ < 15 % DISTORTION Signal to Noise Ratio 72 dB Frequency response 400 Hz – 20 kHz Distortion <15 % THD (@1kHz),

6. LCD Panel

Panel Characteristics

Panel Type HSD190ME12-A02 Type “TFT ACTIVE MATRIX Active Size 376.32 (H) x 301.056 (V) Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.294 mm # of Backlights 4 CCFL edge-light (2 top / 2 bottom) Backlight Life 40,000 Hours (minimum) Panel Performance

Luminance – Condition: CT = 6500K, Contrast = Max, Brightness = Max

250 cd/m2 (typ. after 30-minute warm-up) 200 cd/m2 (minimum after 30-minute warm-up)

Brightness Uniformity ∆L5=Max 1.3 ∆L5= Maximum Luminance/

Minimum Luminance Contrast Ratio 500:1 (typ.), 350:1 (minimum) Color Depth 16.2M colors (RGB 6-bit data+FRC data) Viewing Angle (Horizontal) 140 degrees @ CR>10 Viewing Angle (Vertical) 130 degrees @ CR>10

Response Time 10%-90% @ Ta=25°C

12 ms (typ.)

20 ms (maximum)

Note: The 2nd source of LCD panel is “HSD190ME12-A04”

ViewSonic Corporation Confidential

Do Not Copy VA905

7. Mechanical

Dimensions

Width 418 mm Height 412.5 mm Depth 178.5 mm Monitor Weight 5.6kg / 12.32 lbs

Ergonomics

Tilt Up 25 DEGREES MINIMUM Tilt Down -0 degrees

Package Specifications

Width 490 mm Height 525 mm Depth 145 mm Gross Weight 7.1kg (15.6 lb)

8. Environmental

Environmental Conditions

Operating Temperature 0°C to +40°C Storage Temperature -20°C to +60°C Operating Relative Humidity 20% to 80% RH Non-Condensing Storage Relative Humidity 5% to 90% RH Non-Condensing Operating Altitude 0 to +3,000 meters Storage Altitude 0 to +12,000 meters

ViewSonic Corporation Confidential

Do Not Copy VA905

Main Menu

with OSD controls

Front Control Panel

shown below in detail

Scrolls through menu options

and adjusts the displayed

control.

Also a shortcut to display the

Contrast adjustment control

screen.

Displays the control screen for the highlighted control.

Also toggles between two controls on some screens.

Also a shortcut to Auto Image Adjust.

Power light Green = ON Orange = Power Saving

Standby Power On/Off

Displays the

Main Menu or

exits the

control screen

and saves

adjustments.

3. Front Panel Function Control Description

1. Control Location

ViewSonic Corporation Confidential

Do Not Copy VA905

2. OSD Menu Controls

Select the menu items shown below by using the up [▲] and down [▼] buttons.

 Main Menu:

 Auto Adjust:

To automatically adjust H./V. Position, Phase adjust and Clock adjust.

REMARK: There may need manual adjustment of “ phase ＂ for optimized

performance for various VGA tolerance.

ViewSonic Corporation Confidential

Do Not Copy VA905

 Contrast /Brightness:

To adjust the Contrast of the video and the backlight currency.

 Color Adjust:

To select the color temperature 6500°K, 9300°K , 5400°K or user settings.

ViewSonic Corporation Confidential

Do Not Copy VA905

 Information:

To display the data about Horizontal / Vertical frequency, Pixel clock,

Resolution , Model number and Serial No. of the monitor.

ViewSonic Corporation Confidential

Do Not Copy VA905

 Image Adjust:

H./V. Position: To adjust the horizontal and vertical position of the video. Hsize: To adjust the horizontal pixel clock of the video. Fine Tune: To adjust the delay time of data and clock. Sharpness: To select the picture sharpness of display.

ViewSonic Corporation Confidential

Do Not Copy VA905

 Setup Menu::

Language Select: To select one of eight languages.

(English, French, German, Italian, Spanish, Finnish,

Japanese, Traditional Chinese, and Simplified Chinese)

Resolution Notifier: Enable : OSD will Notifier the best picture quality resolution

change

the resolution to 1280x1024

OSD Position: To set OSD position. OSD Timeout: To set the displaying time of OSD.

INPUT SELECT:TO SELECT DSUB ANALOG OR DVID DIGITAL INPUT

 Memory Recall:

Restore default settings of Clock, H./V. Position, Phase, Contrast, Brightness, Color

temperature, OSD position, OSD timeout and Sharpness, Volume.

 Audio Menu:

Volume: To adjust the output of speaker or earphone. Mute: To set or reset the mute function.

ViewSonic Corporation Confidential

Do Not Copy VA905

3. Hot Keys for Function Controls

Buttons: Functions:

[Up] + [Down] arrows recall Contrast or Brightness while in the Contrast

or Brightness adjustment, or recall both of Contrast and Brightness when the OSD is not on.

[2] + [Up] volume mute on or off when OSD is not on.

[2] Input toggle (Analog or Digital)

[2] + [Up] + [Down] White Balance. White Balance should set the screen

on the pure black and white pattern with 640*480@60Hz resolution.

[2] + [Down] (hold for 10 seconds) Power Lock (Unlock). User won’t be able to turn off

the monitor.

[2] + [Up] (hold for 10 seconds) OSD Lock (Unlock). It will lock all functions.

[Up] + [Down] + [Power On] with signal

(hold for 3 seconds)

Inter FACTORY mode adj white balance.

[Up] + [Down] + [Power On]

without signal

(hold for 3 seconds)

Burn in Mode.

ViewSonic Corporation Confidential

Do Not Copy VA905

1. Power supply (DC/DC Converter)

This brick convert is the 110-220AC input voltage to 12V AND 5V output for invert use and panel use and system controller use. It consists of a PWM IC (FP5001, I804), flywheel diode (MS2 2,D812), buck choke (L812) and capacitor C817. 5V Out put at 5,6 pin VCC 12V In put at L801,L812 pin

2. Scaling controller

The ADC is to convert RGB analog signal to digital signal that scaling chip can acknowledge. The HSYNC input receives a logic signal and provides the frequency reference for pixel clock generation. The scaling IC is to converts the input signal ranging from VGA to SXGA into SXGA resolution that panel can acknowledge.

GENERAL DESCRIPTION

The I108TSU56AK is a high performance, and fully integrated graphics processing IC solution for LCD monitors with resolutions up to SXGA. It is configured with an integrated triple-ADC/PLL, a high quality scaling engine, an on-screen display controller, a built-in output clock generator, an integrated DVI receiver, and LVDS display interface. To further reduce system costs, the TSU56AK also integrates intelligent power management.

3. MTV312M64

The I106 MTV312M micro-controller is an 8051 CPU core embedded device especially tailored for CRT/LCD Monitor applications. It includes an 8051 CPU core, 1024-byte SRAM, 14 built-in PWM DACs, VESA DDC interface, 4- channel A/D converter, and a 64K-byte internal progr am Flash-ROM. A “CMOS output pin” means it can sink and drive at least 4mA current. It is not recommended to use Such pin as input function. A “open drain pin” means it can sink at least 4mA current but only drive 10~20uA to VDD. It can be used as input or output function and needs an external pull up resistor

4. Circuit Description

ViewSonic Corporation Confidential

Do Not Copy VA905

1. Function Test

1.1 Product

- 19” LCD Monitor

1.2 Test Equipment

- Color Video Signal & Pattern (or PC with SXGA resolution and a sound card )

1.3 Test Condition

Before function test and alignment, each LCD Monitor should be run-in and warmed up for at least 30 minutes with the following conditions: (a) In room temperature, (b) With full-white screen, RGB, and Black (c) With cycled display modes,

640*480 (H=43.27kHz, V=85Hz) 800*600 (H=53.7kHz, V=85Hz) 1024*768 (H=68.67kHz, V=85Hz) 1280*1024 (H=79.97kHz, V=75Hz)

1.4 Test Display Modes & Pattern

1.4.1 Compatible Modes

Analog Digital

1. 640 x 350 @ 70Hz, 31.5 k Hz

2. 640 x 480 @ 60Hz, 31.5 k Hz

3. 640 x 480 @ 67Hz, 35.0 k Hz

4. 640 x 480 @ 75Hz, 37.5 k Hz

5. 640 x 480 @ 72Hz, 37.9 k Hz

6. 640 x 480 @ 85Hz, 43.2 7 kHz

7. 720 x 400 @ 70Hz, 31.5 k Hz

8. 800 x 600 @ 56Hz, 35.1 k Hz

9. 800 x 600 @ 60Hz, 37.9 k Hz

10. 800 x 600 @ 75Hz, 46.9kHz

11. 800 x 600 @ 72Hz, 48.1kHz

12. 800 x 600 @ 85Hz, 53.7kHz

13. 832 x 624 @ 75Hz, 49.7kHz

14. 1024 x 768 @ 60Hz, 48.4kHz

15. 1024 x 768 @ 70Hz, 56.5kHz

16. 1024 x 768 @ 72Hz, 58.1kHz

640 x 350 @ 70Hz, 31.5kHz 640 x 400 @ 60Hz, 31.5kHz 640 x 480 @ 60Hz, 31.5kHz 640 x 480 @ 75Hz, 37.5kHz 640 x 480 @ 72Hz, 37.9kHz 640 x 480 @ 85Hz, 43.27kHz 720 x 400 @ 70Hz, 31.5kHz 800 x 600 @ 56Hz, 35.1kHz 800 x 600 @ 60Hz, 37.9kHz 800 x 600 @ 75Hz, 46.9kHz 800 x 600 @ 72Hz, 48.1kHz 800 x 600 @ 85Hz, 53.7kHz 1024 x 768 @ 60Hz, 48.4kHz 1024 x 768 @ 70Hz, 56.5kHz 1024 x 768 @ 72Hz, 58.1kHz 1024 x 768 @ 75Hz, 60.0kHz

5. Adjustment Procedure

ViewSonic Corporation Confidential

Do Not Copy VA905

17. 1024 x 768 @ 75Hz, 60.0kHz

18. 1024 x 768 @ 85Hz, 68.67kHz

19. 1280 x 1024 @ 60Hz, 63.4kHz

20. 1280 x 1024 @ 75Hz, 79.97kHz

1024 x 768 @ 85Hz, 68.67kHz 1280 x 1024 @ 60Hz, 63.4kHz

1.4.2 Function Test Display Pattern

Item Test Content Pattern Specification Remark

1 Frequency & Tracking Fine Line Moire Eliminate visual wavy

noise.

Figure 1

2 Contrast/Brightness 16 Gray Scale 16 gray levels should be

distinguishable.

Figure 2

3 Boundary Horizontal &

Vertical Thickness

Horizontal and Vertical position of video should be adjustable to be within the screen frame.

Figure 3

4 RGB Color

Performance

RGB Color Intensities

Contrast of each R, G, B, color should be normal.

Figure 4, 5, 6

5 Screen Uniformity &

Flicker

Full White Should be compliant with

the spec.

Figure 7

6 Dead Pixel/Line White Screen &

Dark Screen

The numbers of dead pixels should be compliant with the spec.

Figure 7, 8

7 White Balance Wh ite & Black

Pattern

The screen must have the pure white and black pattern, no other color.

Figure 9

Fine Line Morie Pattern (Figure1) Gray Scale Pattern (Figure2)

ViewSonic Corporation Confidential

Do Not Copy VA905

+ 46 hidden pages

ViewSonic VS10805, VA905-1 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual