ViewSonic VG712s Manuale utente

Model No. VLCDS23719-6W/7W

17” Color TFT LCD Display

Service Manual

ViewSonic VG712s/b-1

ViewSonic

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

(VG712s/b_SM_835_1b Rev. 1bOct. 2004)

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

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DCN Number ECR Number

Documents Number Description of Changes EditorRevision SM Editing Date

1a 06/18/04 4475 Initial Release A. Lu

1b 10/18/04 4774 Change Panel From AUO M170EN05 V.8 48.62701.003 12ms/20ms

A. Lu

4626

To AUO M170EG01 V.0 48.62701.004 12ms

TABLE OF CONTENTS

2. Specification

3. Front Panel Function Control Description

4. Circuit Description

6. Trouble Shooting Flow Chart

9. Block Diagram

10. Schematic Diagrams

7. Recommended Spare Parts List

1. Precautions and Safety Notices

5. Adjusting 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 high quality and safety approved AC/DC power adapter.

(5) Disconnect the power plug from AC outlet if the product is not used for a long period of time.

(6) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD displayoff.

(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 susceptible to excessive dusts and dirt.

-Near any appliance generating a strong magnetic field.

-Place 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. Power Supply Requirements

The external power converter for this display utilizes AC and DC cords, AC cord is detachable, but DC cord is permanently

attached. Any attempt to replace another adapter could result in serious problems on the display.

1. Precautions and Safety Notices

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5. LCD Module Handling Precautions

5.1 Handling Precautions

(1) Since front polarizer is easily damaged, pay attention not to scratch it.

(2) Be sure to turn off power supply when inserting or disconnecting from input connector.

(3) Wipe off water drop 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 insure human earth when

handling.

(7) Do not open nor modify the Module Assembly.

(8) Do not press the reflector sheet at the back of the module to any directions.

(9) In case if a Module has to be put back into the packing container slot after once it was taken out from 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 nor tilt the Interface

Connector of the TFT Module.

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

nor bend the TFT Module even momentary. At designing the enclosure, it should be taken into

consideration that no bending/twisting forces are applied to the TFT Module from outside. Otherwise the

TFT Module may be damaged.

(12) Cold cathode fluorescent lamp in LCD contains a small amount of mercury. Please follow local ordinances

or regulations for disposal.

(13) Small amount of materials having no flammability grade is used in the LCD module. The LCD module

should be supplied by power complied with requirements of Limited Power Source (IEC60950 or UL1950),

or be applied exemption.

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

UL1950). Do not connect the CFL in Hazardous Voltage Circuit.

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5.2 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

will probably cause “Mura.”

Take out the monitor with cushions

Take 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. Place 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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1. General Requirements

Test Resolution & Frequency 1280x1024 @ 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-I (Digital)

Default Input Connector Defaults to the first detected input

Video Cable Connector DB-15 Pin out Compliant DDC 2B

Video Signals 1. Video RGB (Analog)

Separate

2. TMDS (Digital)

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

Exclusions Not compatible with interlaced video

3. Power

Power Supply

Power Supply (Adapter) Part Number: LSE 0107A1240

Input Voltage Range 90 to 264 VAC

Over Current Protection 12.7V ~ 18V full load

Power Dissipation 40 Watts (typ.)

4. Electrical Requirements

Horizontal / Vertical Frequency

Horizontal Frequency 30 – 82 KHz

Vertical Refresh Rate 50 – 85* Hz.

1. Since 75Hz in panel spec, the image quality

might be worse than <= 75Hz

2. For resolution 1280 x 1024, the vertical refresh

rate up to 75 Hz; for the rest resolutions, the vertical

refresh rate up to 85Hz

Maximum Pixel Clock 135 MHz

Primary Preset 1280x1024@60Hz

Look up table timing

2. Specification

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<<Analog>>

640 x 350 @ 70Hz, 31.5KHz

640 x 400 @ 60Hz, 31.5KHz

640 x 400 @ 70Hz, 31.5KHz

640 x 480 @ 50Hz, 24.7KHz

640 x 480 @ 60Hz, 31.5KHz

640 x 480 @ 67Hz, 35.0KHz

640 x 480 @ 72Hz, 37.9KHz

640 x 480 @ 75Hz, 37.5KHz

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

832 x 624 @ 75Hz, 49.7KHz

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

1152 x 864 @ 75Hz, 67.5KHz

1152 x 870 @ 75Hz, 68.7KHz

1280 x 1024 @ 60Hz, 63.4KHz

1280 x 1024 @ 75Hz, 79.97KHz

1280x 720 @ 60Hz, 45KHz (HDTV)

<<Digital>>

640 x 350 @ 70Hz, 31.5KHz

640 x 400 @ 60Hz, 31.5KHz

640 x 400 @ 70Hz, 31.5KHz

640 x 480 @ 50Hz, 24.7KHz

640 x 480 @ 60Hz, 31.5KHz

640 x 480 @ 67Hz, 35.0KHz

640 x 480 @ 72Hz, 37.9KHz

640 x 480 @ 75Hz, 37.5KHz

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

832 x 624 @ 75Hz, 49.7KHz

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

1152 x 864 @ 75Hz, 67.5KHz

1152 x 870 @ 75Hz, 68.7KHz

1280 x 1024 @ 60Hz, 63.4KHz

1280 x 1024 @ 75Hz, 79.97KHz

1280x 720 @ 60Hz, 45KHz (HDTV)

Changing Modes

Maximum Mode Change Blank Time for image

stability. Note:

1. 3 seconds (Max), excluding “AutoAdjust”

time

2. Under DOS mode (640 x 350, 720 x 400 &

640 x 400), it should recall factory setting

when execute “Auto Adjust”

3. The monitor needs to do “AutoAdjust” the

first time a new mode is detected

4. While running Change Mode, Auto Adjust or

Memory Recall, the image shall blank.

5. Audio Interface

Speaker Specification

Line input connection 3.5 mm stereo jack

Line input signal 1.0 Vrms

Line inputimpedance 10 k Ohm

Maximum power output (Electric) 3 W @ < 8% DISTORTION

Signal to Noise Ratio 72 dB

Frequency response 400 Hz – 20 KHz

Distortion < 8 % THD (@1KHz)

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6. LCD Panel

Panel Characteristics

Source panel AU panel (M170EG01 V0)

Size 17”diagonal screen size

Type MVA type with LVDS interface

Pixel 1280*1024 addressable pixels

Pixel Pitch 0.264mm*0.264mm pixel pitch

Brightness 300 cd/m2 (Typ after 30 minute warm up)

Contrast Ratio 500:1 (Typ), 300:1 (Min)

ViewingAngle(Horizontal) 140 deg @ CR>10

ViewingAngle (Vertical) 130 deg @ CR>10

Response Time 12 ms (Tr=9ms, TF =3 ms) (Typ.)

Backlight lamps 4 CCFL backlight lamps

Backlight Life 50,000 Hours (Typ.) / 45,000 hours (Min.)

7. Mechanical

Dimensions

Width 378 mm (14.9 inch)

Height 405 mm (16.0 inch)

Depth 177 mm ( 7.0 inch)

Monitor Weight 5.3 kg / 11.66 lbs

Ergonomics

Tilt Up 20 º +/- 20%

Tilt Down -5 º +/- 20%

8. Environmental

Environmental Conditions

Operating Temperature 0°C to +40°C

Storage Temperature -20°C to +60°C

Operating Relative Humidity 20% to 90% 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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