ViewSonic VS10805 Manuale utente

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. 1aJun.2005)

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

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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

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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. LCDModule 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 CMOSLSI isusedinthis 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 theTFT Module intoan enclosure(LCDmonitor 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 theTFT 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 fordisposal.

(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 theCCFL to a HazardousVoltage Circuit.

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5. Handling and PlacingMethods

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”

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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”.

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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

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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 LCDpanel is“HSD190ME12-A04”

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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

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