ViewSonic VX910 - 19" LCD Monitor User manual

Model No. VS10162
19” Color TFT LCD Display
Service Manual
ViewSonic VX910-1
ViewSonic
381 Brea Canyon Road, Walnut, California 91789 USA - [phone]
(VX910_SM_834 Rev. 1aJune 2004)

Copyright
Copyright
¤
2004by ViewSonic Corporation. All rights reserved. No partof 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
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
V
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
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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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