ViewSonic VLCDS25973-4W, VLCDS25973-4W5W Service Manual

Model No. VLCDS25973-4W/5W

19” Color TFT LCD Display

Service Manual

ViewSonic VP912s/b1

ViewSonic



381 Brea Canyon Road, Walnut, California 91789 USA - [phone]

(VP912s/b_SM_902 Rev. 1b Mar. 2005)

Copyright

Copyright

¤

2005 by ViewSonic Corporation. All rights reserved. No part of 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

i

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

DCN Number ECR Number

Documents Number

Description of Changes EditorRevision SM Editing Date

1a

08/26/04

4644

Initial Release

A. Lu

1b

03/04/05

5005

Panel Change from AUO M190EN04 V1(12ms)

A. Lu

4819

Scaler GM5120

to AUO M190EN04 V4 (12ms),

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

1
5
8

15

18

42
46

56
71
72

78

ii

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

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. LCD Module 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 CMOS LSI is used in this 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

1

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

(11) After installation of the TFT Module into an enclosure (LCD monitor 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 the TFT 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 for disposal.

(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 the CCFL to a Hazardous Voltage Circuit.

2

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

5. Handling Methods

3

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

Only touch the metal frame of the LCD
panel or the front cover of the monitor. Do
not touch the surface of the polarizer.

If the surface of the LCD panel is pressed
by fingers, that may cause "MURA."

Take out the monitor by grasping the cushions.

If the monitor is removed by grasping the
LCD panel, that may cause "MURA."

Correct Methods:

Incorrect Methods:

4

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

Place the monitor on a clean and soft
foam pad.

If the monitor is placed on foreign objects,
that could scratch the surface of the panel
or cause "MURA."

If the panel is placed facedown on the

lap, that may cause "MURA."

1. General Requirements

General Specifications

Test Resolution & Frequency 1280x1024 @ 60Hz
Test Image Size Full Size

Contrast and Brightness Controls

Factory Default:
Contrast = 50%, Brightness = 100%

2. Signal Interface

Video Interface

Input Connector 1 (Analog 1) DB-15 (Analog)
Input Connector 2 (Analog 2) 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, Composite, and Sync on Green

2. TMDS (Digital)
Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)
Exclusions Not compatible with interlaced video

3. Power

Power Supply

Internal Power Supply Primary : LSE0204A1250

2

nd

source: Tiger power TOF 5001
Input Voltage Range 90 to 264 VAC
Over Current Protection 7.0 A typical at 12.0 VDC
Power Dissipation 50 Watts (typ.)

2. Specification

5

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

4. Electrical Requirements

Horizontal / Vertical Frequency

Horizontal Frequency 24 – 82 KHz
Vertical Refresh Rate 50 – 85* HZ.

FOR RESOLUTION 1280 X 1024, THE
VERTICAL RFRESH RATE UP TO 75 HZ; FOR
THE REST RESOLUTIONS, THE VERTICAL

REFRESH RATE UP TO 85HZ
Maximum Pixel Clock 135 MHz
Primary Presets 1280x1024 @ 60Hz
Look up table timing
<<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

z Maximum Mode Change Blank Time for

image stability : 3 seconds (Max), excluding
“Auto Adjust” time

z Under DOS mode (640 x 350, 720 x 400 &

640 x 400), it should recall factory setting
when execute “Auto Adjust” by “0-Touch™”

z The monitor needs to do “Auto Adjust” the

first time a new mode is detected (see section
“0-Touch™ Function Actions”)

z While running Change Mode, Auto Adjust or

Memory Recall, the image shall blank

6

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

5. LCD Panel

Panel Characteristics

Model number AUO M190EN04
Type TN type with LVDS interface
Active Size 376.32 (H) x 301.06 (V)
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.294 mm
GLASS TREATMENT Anti Glare (Hard coating 2H)
# OF BACKLIGHTS 4 CCFL edge-light (2 top / 2 bottom)
BACKLIGHT LIFE 50,000 (Typ) / 40,000 Hours (Min)
Luminance (Center) – CT = 6500K
Contrast/ Brightness = Max

400 cd/m2 (Typ after 30 minute warm up)

350 cd/m2 (Min after 30 minute warm up)
Brightness Uniformity 75% (Typ) / 70% (Min) Entire Area
Contrast Ratio 450:1 (typ), 250:1 (min)
Color Depth 16 million colors (6+2 bit)
Viewing Angle (Horizontal, CR>10) Minimum: 130º (±65º)

Typical: 135º (+70º/-65º)
Viewing Angle (Vertical, @ CR>10) Minimum: 125º (+65º/-60º)
Response Time
10%-90% @ Ta=25°C

12 ms (Tr= 3.6 ms, Tf = 8.4 ms) (typ)

21 ms (Tr= 6.3 ms, Tf = 14.7 ms) (max)

6. Mechanical

Dimensions

Width 416 mm (16.4 inch)
Height 460 mm (18.1 inch)
Depth 238 mm (9.4 inch)
Monitor Weight 7.5 kg / 16.5 lbs

Ergonomics

Tilt Up

From 0º up to ≧20º+/-2º

Tilt Down From 0º down to -3º ~ -5 º

7. 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

7

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

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
analog and digital connection.

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

8

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

Do the following to adjust the screen image:

1

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

4

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

5

To 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 @ 60Hz 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.)

9

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

NOTE: All OnView menus and adjustment screens disappear automatically
after about 30 seconds. This time period is adjustable through the Setup

menu and the OSD timeout control described on page 10.

2

To select a control to be adjusted, press ▲ or ▼ to scroll up or down in
the Main Menu.

3

To select the highlighted control, press button [2]. A control screen appears
like the example shown below.

The line at the bottom
of the screen shows
the current functions
of buttons 1 and 2:
in this example, either
EXIT or select the
BRIGHTNESS
control.

Main Menu Controls

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

Control Explanation

Auto Image Adjust

sizes and centers the screen image

automatically.

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

toggles between inputs if you have more than one

computer connected to the VP912b/VP912s.

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.

5000K

— Adds blue and green to the screen image for a darker

color.

10

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

User Color

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

and blue (B)

.

1

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

2

To 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

Information

displays the timing mode (video signal input)
coming from the graphics card in your computer, the LCD
model number, the serial number, and the ViewSonic website
URL. See your graphic card’s user guide for instructions on
changing the resolution and refresh rate (vertical frequency).

NOTE:

VESA 1280 x 1024 @ 60Hz (recommended) means
that the resolution is 1280 x 1024 and the refresh rate is 60
Hertz.

Manual Image Adjust Sub-menu

H. Size (Horizontal Size)

adjusts the width of the screen image.

H./V. Position (Horizontal/Vertical Position)

moves the screen

image left or right and up or down.

11

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

Fine Tune sharpens the focus by aligning the text and graphics with

display pixels.

NOTE: Try Auto Image Adjust first.

Sharpness

adjusts the clarity and focus of the screen image.

Setup menu displays the menu shown below:

Language Selec t

allows the user to choose the language used in the menus

and control screens.

Control Explanation

Resolution Notice

allows you to enable or disable this notice.

If you enable the Resolution Notice shown above and your
computer is set at a resolution other than 1280 x 1024, the
following screen appears.

12

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

OSD Position

allows the user to move the on-screen display menus

and control screens.

OSD Timeout

sets the length of time the on-screen display
screen is displayed. For example, with a “30 second” setting, if a
control is not pushed within 30 seconds, the display screen
disappears.

Control Explanation

Memory Recall

returns the adjustments back to factory settings
if the display is operating in a factory Preset Timing Mode listed
in the Specifications of this manual.

OSD Pivot

This function is used to rotate the OSD menu,

when the display is changed from Landscape to Portrait mode.

OSD Background

On/Off

allows the user to turn the On-Screen display

background on or off.

13

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

Input Priority If multiple computers will be connected to the display,

this function can be used to select which computer has priority.
The display will do a one time detection for available inputs when first

powered on, and choose one depending on the selected input priority.
For example: If the Input Priority setting is D-SUB1=>D-SUB2=>DVI,
then the first priority will be given to D-SUB1 when the display turns
on. If there is no video signal on D-SUB1, then the next priority will be
given to D-SUB-2, etc… In the case when only one signal is present at
the three inputs, then the display will automatically detect and display
that signal.

The Input Priority setting can also be disabled. In this case, the input will
return to the last active setting when the display is first turned on. The
user will need to set all the port settings manually under this condition.
Inputs can be switched quickly by pressing the "Up" arrow
button on the front control panel.

Hot Keys for Function Controls

Buttons: Functions:

[Up] or [Down] arrows To immediately activate Contrast menu. It should

be change to Brightness OSD by push button [2]

[Up] + [Down] arrows Recall Contrast or Brightness while in the Contrast

or Brightness adjustment, or recall both of Contrast
and Brightness when the OSD is not on.

[1] + [2] Toggle 720x400 and 640x400 mode when input

720x400 or 640x400 mode.

[1] + [Power On] with signal Factory Mode

[1] + [Up] + [Down] White Balance: shall enter Factory Mode first.

White Balance should set the screen on the pure
black and white pattern with 1280*1024@60Hz
resolution.

[1] + [Down] (hold for 10 seconds) Power Lock (Unlock). User won’t be able to turn off

the monitor.

[1] + [Up] (hold for 10 seconds) OSD Lock (Unlock). It will lock all functions.

[Up] + [Down] + [Power On] with signal

(Hold for 3 seconds. Release “Power” button first

and then “Up” & ”Down” buttons.)

All Mode Reset. It will erase all end users’ settings
and restore the factory defaults.

[Up] + [Down] + [Power On]

Without signal

(Hold for 3 seconds. Release “Power” button first

and then “Up” & ”Down” buttons.)

Burn in Mode. After entering Burn in Mode, press
[1] button, you can find the information about this
monitor.

Remark: All the shortcut functions are only available while OSD is off.

14

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

1. Power supply (DC/DC Converter)

The AP1501 is monolithic IC designed for M/B DC/DC converter, and owns the ability of driving a 3A load without

any additional transistor component.

The AP1501 operates at a switching frequency of 150KHz and thus allows smaller-sized filter components than what

would be needed with lower frequency switch regulator.

4. Circuit Description

15

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

2. Flash Memory

The Pm39LV010R is a 1 Megabit, 3.3 Volt-only Flash Memory organized as 131,072 bytes of 8 bits each.
This device is designed to use a 3.0 Volt to 3.6 Volt power supply to perform in-system programming.

The 1 Megabit memory array is divided into thirty-two uniform blocks of 4 Kbytes each for data and/or code storage.

The block architecture allows users to flexibly make chip erase or block erase operation. The block erase feature

a

llows a particular block to be erased and reprogrammed without affecting the data in other blocks. After the

device performs chip erase or block erase operation, it can be reprogrammed on a byte-by-byte basis.

3. GM5120

The gm5110/20 is a graphic processing IC for Liquid Crystal Display (LCD) monitors at XGA/SXGA resolution.

It provides all key IC functions required for the highest quality LCD monitors. On-chip functions include a
high-speed triple-ADC and PLL, Ultra-Reliable DVI

TM receiver

, a high quality zoom and shrink scaling engine,

an on-screen display (OSD) controller, digital color controls and an on-chip microcontroller (OCM). With this level
of integration, he gm5110/20 devices simplify and reduce the cost of LCD monitors while maintaining a high-degree
of flexibility and quality.

16

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

gm5110/5120 System Design Example

4. LVDS (THC63LVDM8 3A)

The THC63LVDM83A transmitter converts 28 bits of CMOS/TTL data into LVDS (Low Voltage Differential

Signaling) data stream. A phase-locked transmit clock is transmitted in parallel with the data streams over a fifth
LVDS link. The HC63LVDM83A can be programmed for rising edge or falling edge clocks through a dedicated pin.
The THC63LVDF84A receiver converts the LVDS data streams back into 28 bits of CMOS/TTL data with falling
edge clock. At a transmit clock frequency of 85MHz, 24 bits of RGB data and 4 bits of LCD timing and control data

(HSYNC, VSYNC, CNTL1, CNTL2) are transmitted at a rate of 595 Mbps per LVDS data channel.

17

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

1. Function Test

1.1 Product

- 19” LCD Monitor

1.2 Test Equipment

- Color Video Signal & Pattern (or PC with SXGA resolution)

1.3 Test Condition

Before function test and alignment, each LCD Monitor should be run-in and warmed up for at least 30
minutes with the following conditions:

(a) In room temperature,

(b) With full-white screen, RGB, and Black

(c) With cycled display modes,

640*480 (H=43.27KHz, V=85Hz)

800*600 (H=53.7KHz, V=85Hz)

1024*768 (H=68.67KHz, V=85Hz)

1280*1024 (H=79.97KHz, V=75Hz)

1.4 Test Display Modes & Pattern

1.4.1 Compatible Modes

Analog Digital

1. 640 x 350 @ 70Hz, 31.5kHz

2. 640 x 400 @ 60Hz, 31.5kHz

3. 640 x 400 @ 70Hz, 31.5kHz

4. 640 x 480 @ 50Hz, 24.7kHz

5. 640 x 480 @ 60Hz, 31.5kHz

6. 640 x 480 @ 67Hz, 35.0kHz

7. 640 x 480 @ 72Hz, 37.9kHz

8. 640 x 480 @ 75Hz, 37.5kHz

9. 640 x 480 @ 85Hz, 43.27kHz

10. 720 x 400 @ 70Hz, 31.5kHz

11. 800 x 600 @ 56Hz, 35.1kHz

12. 800 x 600 @ 60Hz, 37.9kHz

13. 800 x 600 @ 75Hz, 46.9kHz

14. 800 x 600 @ 72Hz, 48.1kHz

15. 800 x 600 @ 85Hz, 53.7kHz

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

5. Adjustment Procedure

18

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

16. 832 x 624 @ 75Hz, 49.7kHz

17. 1024 x 768 @ 60Hz, 48.4kHz

18. 1024 x 768 @ 70Hz, 56.5kHz

19. 1024 x 768 @ 72Hz, 58.1kHz

20. 1024 x 768 @ 75Hz, 60.0kHz

21. 1024 x 768 @ 85Hz, 68.67kHz

22. 1152 x 864 @ 75Hz, 67.5kHz

23. 1152 x 870 @ 75Hz, 68.7kHz

24. 1280 x 1024 @ 60Hz, 63.4kHz

25. 1280 x 1024 @ 75Hz, 79.97kHz

26. 1280x 720 @ 60Hz, 45kHz (HDTV)

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)

1.4.2 Function Test Display Pattern

Item Test Content Pattern Specification Remark

1 Frequency & Tracking Fine Line Moire Eliminate visual wavy noise. Figure 1
2 Contrast/Brightness 16 Gray Scale 16 gray levels should be

distinguishable.

Figure 2

3 Boundary Horizontal & Vertical

Thickness

Horizontal and Vertical position of
video should be adjustable to be
within the screen frame.

Figure 3

4 RGB Color Performance RGB Color Intensities Contrast of each R, G, B, color

should be normal.

Figure 4, 5, 6

5 Screen Uniformity & Flicker Full White Should be compliant with the spec. Figure 7
6 Dead Pixel/Line White Screen & Dark

Screen

The numbers of dead pixels should
be compliant with the spec.

Figure 7, 8

7 White Balance White & Black Pattern The screen must have the pure

white and black pattern, no other
color.

Figure 9

Fine Line Morie Pattern (Figure1) Gray Scale Pattern (Figure2)

19

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

Horizontal & Vertical Thickness Pattern (Figure 3) R. Color Pattern (Figure 4)

G. Color Pattern (Figure5) B. Color Pattern (Figure 6)

Full White Patter (Figure 7) Dark Screen Pattern (Figure 8)

20

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

Black-White Pattern (Figure 9)

1.5 Function Test and Alignment Procedure

1.5.1 All Modes Reset

You should do “All Mode Reset” (Refer to Chapter III-3. Hot Keys for Function Controls) first. This action
will allow you to erase all end-user’s settings and restore the factory defaults.

1.5.2 Auto Image Adjust

Please select and enter “Auto Image Adjust” function on Main Menu to see if it is workable.
The "Auto Image Adjust" function is aimed to offer a better screen quality by built-in ASIC.
For optimum screen quality, the user has to adjust each function manually.

1.5.3 Firmware

Test Pattern: Burn In Mode (Refer to Chapter III-3. Hot Keys for Function Controls)

- Make sure the F/W is the latest version.

1.5.4 DDC

Test Pattern: EDID program

- Make sure it can pass test program.

1.5.5 Fine Tune and Sharpness

Test Signal: 1280*1024@60Hz

Test Pattern: Line Moire Pattern

- Check and see if the image has noise and focus performs well. Eliminate visual line bar.

- If not, readjust by the following steps:

(a) Select and enter “Fine Tune” function on “Manual Image Adjust” to adjust the image to eliminate

visual wavy noise.

(b) Then, select and enter “Sharpness” function to adjust the clarity and focus of the screen image.

21

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b

1.5.6 Boundary

Test Signal: 1280*1024@60Hz

Test Pattern: Horizontal & Vertical Line Thickness Pattern

- Check and see if the image boundary is within the screen frame.

- If not, readjust by the following steps:

(a) Select and enter “Manual Image Adjust” function on OSD Main Menu.

(b) Then, select and enter “Horizontal Size” or “Horizontal/Vertical Position” function to adjust the

video boundary to be full scanned and within screen frame.

1.5.7 White Balance (Auto Gain) (Refer to Chapter III-3. Hot Keys for Function Controls)

Test Signal: 1280*1024@60Hz

Test Pattern: White and Black Pattern

1.5.8 R, G, B, Colors Contrast

Test Signal: 1280*1024@60Hz

Test Pattern: R, G, B, Color Intensities Pattern and 16 Gray Scale Pattern

- Check and see if each color is normal and distinguishable.

- If not, please return the unit to repair area.

1.5.9 Screen Uniformity and Flicker

Test Signal: 1280*1024@60Hz

Test Pattern: Full White Pattern

- Check and see if it is in normal condition.

1.5.10 Dead Pixel and Line

Test Signal: 1280*1024@60Hz

Test Pattern: Dark and White Screen Pattern

- Check and see if there are dead pixels on LCD panel with shadow gauge and filter film.

- The total numbers and distance of dead pixels should be compliant with the spec.

1.5.11 Mura

Test Pattern: White, RGB, Black, & Grey

Test Tool: 8% ND Filter

- Use 8% ND Filter to check if any Mura on the screen.

22

ViewSonic Corporation Confidential

-

Do Not Copy VP912s/b