ViewSonic VX910 - 19" LCD Monitor Bedienungsanleitung

Model No. VS10162

19” Color TFT LCD Display

Service Manual

ViewSonic VX910-1

ViewSonic

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

(VX910_SM_834 Rev. 1aJune 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 06/07/04 Initial Release DCN-4474 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 be taken while servicing this LCD display. Because of the high voltage used in the inverter

circuit. These voltage are exposed in such areas as the associated transformer circuits .

3. POWER SUPPLY REQUIREMENTS

The internal 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 power board could result in serious problem

on 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 a 1500 ohm , 10 watt resistor , paralleled by a 0.15uF capacitor between each metallic part

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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Mechanical :

Dimension ( W x H x D ) mm

Set : a. with stand :430.8 x 468.4 x 201 mm

b. Without stand :430.8 x 370.2 x 66.2mm

Slim bezel :19.0 / 19.0 / 22.0 /22.0

Base (L X W) :286 x 201 mm

Packing : ( W x H x D ) mm :496 x 532 x 247 mm

Weight : Net / Gross ( Kg ) :6.7 / 8.5

Wall Mount (VESA) :100 x 100 mm

LCD Panel type :LG / LM190E03 Rev.03

Max. resolution (HxV) :1280 x 1024

Nominal picture size (HxV) :376.3 mm x 301.1 mm

Display colors :16.2 M ( 6 bit + dithering )

Dot pitch :0.264 mm

Response time :4+12/ 16ms (Tr + Tf / typical)

Brightness (100% white) :Typical : 250 cd/m² , Min. 200cd/m²

Contrast :Typical : 500:1, Min. 300:1

Viewing angle :70 / 70/70 / 70 (L/R/T/B CR>=10)

Synchronization :Fh = 31~82 KHz / Fv=50~75Hz

Presets :26 timing modes

OSD Languag :8 kinds languages

Color Temperature :sRGB , 6500°K (default) / 9300°K

/5400°K / User R,G,B

Plug & Play :DDC1/2B interface

Scaler chip :Mstar MST8131a

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

Power consumption :< 40W green / < 1W amber

(On / Off mode)

2. Specification

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AdjustingtheScreen 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.

Front Control Panel

shown below in detail

Main Menu

With OnView controls

Scrolls through menu options and

adjusts the displayed control.

Also a shortcut to display the

Contrast adjustment control

screen.

Power

On/Off

Displays the control

screen for the highlighted

control.

Also toggles between two

controls on some

screens.

Also a shortcut to toggle

between analog and

digital connections.

Power light

Green = ON

Orange = Power

Saving

Displays the Main Menu

or exits the control screen

and saves adjustments

3. Front Panel Function Control Description

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Do the following to adjust the screen image:

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

NOTE: All OnView menus and adjustment screens disappear automatically

after about 30 seconds.

2To select a control you want to adjust, press ▲or ▼to scroll up or down the

Main Menu.

3After the control is selected, press button [2]. A control screen like the one

shown below appears.

4To adjust the control, press the up ▲or down ▼buttons.

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 display. (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. (The black border around the

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

LCD display.)

The line at the

bottom of the

screen tells you

what you can do

next: Exit or select

the Brightness

control.

1: Exit 2 : Brightness

Contrast

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Main Menu Controls

Adjust the menu items shown below by using the up ▲ and down ▼ 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.

If this function does not work on your LCD display, then

lower the video refresh rate to 60 Hz and set the resolution

to its

Contrast adjusts the difference between the image background

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

Brightness adjusts background black level of the screen image.

Input Select allows you to toggle between an analog and a

digital signal.

pre-set value.

functions are not available for DVI input.

NOTE:

1. Auto Image Adjust works with most common video cards.

2. The Auto Image Adjust and most Manual Image Adjust

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Color Adjust provides several color adjustment modes: preset

color temperatures and RGB which allows you to adjust red (R),

green (G), and blue (B) separately. The factory setting for this

product is 6500K (6500 Kelvin).

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

in most office settings with fluorescent lighting).

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

richer red.

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

User Color — Individual adjustments for red (R), green (G),

and blue (B).

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

2To adjust selected color, press ▲or ▼.

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.

Control Explanation

SRGB

9300K

6500K

5400K

User Color

Color Adjust

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.

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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).

NOTE: VESA 1280 x 1024 @ 60 Hz (recommended) means

that the resolution is 1280 x 1024 and the refresh rate is 60

Hertz.

Manual Image Adjust displays the Manual Image Adjust menu.

The Manual Image Adjust controls are explained below:

Horizontal Size adjusts the width of the screen image.

Horizontal Position moves the screen image left or right.

Vertical Position moves the screen image up or down.

Fine Tune sharpens focus by aligning the illuminated text and/

or graphic characters.

Sharpness adjusts the clarity and focus of the screen image.

Control Explanation

H . / V . Position

Manual Image Adjust

1: Exit 2 : Select

H . Size

Fine Tune

Sharpness

H. Frequency: 31.47 KHz

Information

V. Frequency: 31.47 Hz

Pixel Clock: 24.80 MHz

Resolution: 640 x 480

Model No. :

Serial No. :

www.viewsonic.com

1: Exit

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