ViewSonic VX750 VLCDS27089-1W Manuale utente

Model No. VLCDS27089-1W

17” Color TFT LCD Display

Service Manual

ViewSonic VX7501

ViewSonic

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

(VX750_SM_755 Rev. 1a Apr. 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

Revision Date Description Of Changes Approval

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1a 04/27/04 Initial Release DCN-3772 Angela Lu

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. 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 guide line

2. Safety Check :

Care should betaken while servicing this LCDdisplay,due to thehigh voltageused in the inverter circuit.

High voltage is exposed in suchareas as the associated transformer circuits .

3. POWER SUPPLY REQUIREMENTS

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

DC cord is permanently attached .Any attempt to replace another adapter could result in damage to the display .

4. LEAKAGE CURRENT HOT CHECK

4-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this check.

4-2 Connect a1500ohm , 10wattresistor , paralleledwith a0.15uF capacitorbetween each metallicpart

and a good earth ground

4-3 Use an AC voltmeter with 1000 ohm / volt or more sensitivity and measure the AC voltage across the

combination 1500 ohm resistor and 0.15uF capacitor.

4-4 Move the resistor connection to each exposed metallic part and measure the voltage.

4-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement.

4-6 Voltage measured must not exceed 1.5 volt RMS, from any exposed metallic part to the ground. A leakage

current tester may be used in the above hot check, in which case any circuit measured must not exceed 1.0

milliamp. In the case of a measurement exceeding the 1.0 milliamp value, a rework is required to eliminate the

chance of a shock hazard .

To Metal Parts

AC VOLTMETER

1500 10W

0.15u

Earth Ground

1. Precautions and Safety Notices

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x H x D ) mm

502 x 405 x 195 mm

ering )

Tf / typical)

te : /m²

/ 9300°K

Mechanical :

Dimension ( W

Set a. with stand:

b. Without stan 502 x 340 x 63 mm

Base (L X W): 275 x 195 mm

Packing:(Wx H x D ) mm:572 x 491 x240

Weight :Net /Gross ( Kg): 5.6 /8.2

Wall Mount (VESA): 100 x 100

LCD Panel type: QDI / QD17EL07

Max. resolution (HxV) : 1280 x 1024

Nominal picture size (HxV): 338 mm x 270

Display colors: 16.2 M ( 6 bit + dith

Dot pitch: 0.264 mm

Response time: 4 +12 / 16ms (Tr +

Brightness (100% whi ) Typical : 270 cd/m² , Min. 220cd

Contrast : Typical : 450:1, Min. 300:1

Viewing angle : 75 / 75 /65 / 60 (L/R/T/B CR>=10)

Synchronization: Fh = 31~82 KHz / Fv=50~85Hz

Presets: 18timingmodes

OSD Language : 9 languages

Color Temperature : sRGB , 6500°K (default)

5400°K/UserR,G,B

Plug & Play : DDC1/2B interface

Scaler chip: Mstar MST 8131

Audio Input Connector: 3.5 mm Stereo, PC2001

Audio Amplifier : 5W x 2 (chip :TPA3002)

AC Power range: 90 V ~ 264 V, 50 Hz / 60

Power consumption: < 50W green / < 1W amber

(On/Offmode)

2. Specification

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Adjusting the Screen Image

Use the buttons on the front control panel to display and adjust the OnView®

controls which display on the screen. The OnView controls are explained at the

top of the next page.

Main Menu

With OnView controls

UP / DOWN : Scrolls through menu options and adjusts the displayed control.

Also a shortcut to display the Contrast adjustment control screen.

2 Enter : Displays the control screen for the highlighted control.

INPUT SELECT : Also toggles between two controls on some screens.

Also a shortcut to Auto Image Adjust.

1 MENU : Displays the Main Menu or exits the control screen and saves adjustments.

VOL- / VOL+ : Decreases or increases volume.

Power On / Off

Power light

Blue = ON

Orange = Power Saving

3. Front Panel Function Control Description

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. (The black border around the

edge of the screen should barely touch the illuminated “active area” of the

LCD dislay.)

The line at the

bottom of the

screen tells you

what you can do

next: Exit or Select

the control that is

highlighted.

Do the following to adjust the screen image:

1To display the Main Menu, press button [1].

4To adjust the control, press the up Ior down Jbuttons.

5To save the adjustments and exit the menu, press button [1] twice.

The following tips may help you optimize your display:

• Adjust your computer's graphic card so that it outputs a video signal 1280 x

1024 @ 60 Hz to the LCD dislay. (Look for instructions on “changing the

refresh rate” in your graphic card's user guide.)

• If necessary, make small adjustments using H. POSITION and V. POSITION

until the screen image is completely visible

NOTE: All OnView menus and adjustment screens disappear automatically

after about 15 seconds. This time period is adjustable through the Setup

menu and the OSD timeout control described on page 11.

2To highlight a control you want to adjust, press Ior Jto scroll up or down

the Main Menu.

3To select the highlighted control, press button [2]. A control screen appears

like the example shown below.

Contrast

1:EXIT 2: Brightness

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Main Menu Controls

Adjust the menu items shown belowbyusing the up Iand downJbuttons.

Control Explanation

Auto Image Adjust automatically sizes, centers, and fine tunes the

video signal to eliminate waviness and distortion.

Press the [2] button to obtain a sharper image.

NOTE:Auto Adjust works with most common video cards. If

this function does not work on your LCD dislay, then lower the

video refresh rate to 60 Hz and set the resolution to its pre-set

value.

Contrast adjusts the difference between the image background

(black level) and the foreground (white level).

Brightness adjusts background black level of the screen image.

Color Adjust provides several color options: preset color

temperatures and User which allows you to adjust red (R), green

(G), and blue (B). The factory setting for this product is 6500K

(6500 Kelvin).

6500K — Adds red to the screen image for warmer white and

richer red. Default setting.

9300K — Adds blue to the screen image for cooler white (used

in most office settings with fluorescent lighting).

sRGB —sRGB is quickly becoming the industry standard for color

management, with support being included in many of the latest

applications. Enabling this setting allows the LCD display to

more accurately display colors the way they were originally

intended. Enabling the sRGB setting will cause the Contrast and

Brightness adjustments to be disabled.

5400K — Adds green to the screen image for a darker color.

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Information displays the timing mode (video signal input)

coming from the graphics card in your computer. See your

graphic card’s user guide for instructions on changing the

resolution and refresh rate (vertical frequency).

VESA 1280 x 1024 @ 60 Hz (recommended) means that the

resolution is 1280 x 1024 and the refresh rate is 60 Hertz.

Control Explanation

Manual Image Adjust

The Image Adjust controls are explained below:

1To select color (R, G or B) press button [2].

2To adjust selected color, press Ior J.

3When you are finished making all color adjustments, press

button [1] twice.

User — Individual adjustments for red, green, and blue.

Input Select allows you to toggle between an analog and a

digital signal.

Important: If you select RECALL from the Main Menu when

the product is set to a Preset Timing Mode, colors return to the

6500K factory preset.

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Fine Tune sharpens focus by aligning the illuminated text and/

or graphic characters.

NOTE: Try the Auto Adjust (see page 9) before using the Fine

Tune control.

Sharpness adjusts the clarity and focus of the screen image.

Setup Menu displays the menu shown below.

Control Explanation

the menus and control screens.

The Setup Menu controls are explained below.

Resolution Notice advises the optimal resolution to use.

Language Select allows you to choose the language used in

H. Size (Horizontal Size) adjusts the width of the screen image.

NOTE: Vertical size is automatic with your LCD dislay.

H./V. Position adjusts horizontal and vertical position of the

screen image. You can toggle between Horizontal and Vertical

by pressing button [2]. Horizontal moves the screen image to

the left or to the right. Vertical moves the screen image up and

down.

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