ViewSonic VP191b, VP191s, VLCDS25973-2W, VLCDS25973-3W Service manual

Service Manual

ViewSonic VP191b/s-1

Model No. VLCDS25973-2W/3W

19” Color TFT LCD Display

ViewSonic

(VP191b/s_SM_678 Rev. 1c Oct. 2004)



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

Copyright

Copyright

2004 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

Optiquest is a registered trademark of ViewSonic Corporation.
ViewSonic is a registered trademark of ViewSonic Corporation.
All other trademarks used within this document are the property of their respective owners.

1a

1b

1c

DCN Number ECR Number

06/28/03

04/23/04

10/18/04

Revision History

Documents Number

3379

4290

4775

4226

4801

Initial Release

Cost Down Chassis change

Change Panel From FJ FLC48SXC8V-11A SXGA 25ms
To FJ FLC48SXC8V-11AA 16ms

Description of Changes EditorRevision SM Editing Date

F. Fellen

A. Lu

A. Lu

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TABLE OF CONTENTS

1. Precautions and Safety Notices

2. Specification

3. Front Panel Function Control Description

4. Circuit Description

5. Adjusting Procedure

6. Trouble Shooting Flow Chart

7. Recommended Spare Parts List

8. Exploded Diagram And Spare Parts List

9. Block Diagram

10. Schematic Diagrams

11. PCB Layout Diagrams

1

3
7

17

19

42
46

54
69
70

76

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1. Precautions and Safety Notices

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 power cord.
(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 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 susceptible to excessive dust 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. 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 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.

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(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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2. Specification

2-1 GENERAL SPECIFICATION

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

Contrast and Brightness Controls

2-2 VIDEO INTERFACE

Input Connector 1 (Analog 1) DB-15 (Analog), refer the appendix A
Input Connector 2 (Analog 2) DB-15 (Analog), refer the appendix A
Input Connector 3 (Digital) DVI-D (Digital), refer the appendix B
Default Input Connector Defaults to the first detected input
Video Cable Strain Relief Equal to twice the weight of the monitor for five minutes
Video Cable Connector DB-15 Pin out Compliant DDC 2B

Video Signals

Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)
Maximum PC Video Signal 950 mV with no damage to monitor
Maximum Mac Video Signal 1250 mV with no damage to monitor
Sync Signals TTL
DDC 2B Compliant with Revision 1.3
Sync Compatibility Separate Sync, Composite Sync, SOG

Video Compatibility

Resolution Compatibility

Exclusions Not compatible with interlaced video

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

1. Video RGB (Analog)
Separate, Composite, and Sync on Green

2. TMDS (Digital)

Shall be compatible with all PC type computers,
Macintosh computers, and after market video cards
640 x 350*
600, 832 x 624, 1024 x 768, 1152 x 864, 1152 x 870*

1

, 640 x 480, 720 x 400*1 (640 x 400*), 800 x

2

,
1280 x 720, 1280 x 960, 1280 x 1024
*1 The image vertical size might not be full screen.

But the image vertical position should be at the
center.

*2 Under 1152x870@60Hz or 72Hz, the OSD

information

shows on “1152x864”

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2-3 POWER SUPPLY

Internal Power Supply

Primary : LSE0204A1250

nd

source: Tiger power TOF 5001

2
Input Voltage Range 90 TO 264 VAC
Input Frequency Range 47.5 TO 63 HERTZ
Short Circuit Protection Output can be shorted without damage
Over Current Protection 7.0 A typical at 12.0 VDC
Leakage Current 3.5mA (Max) at 254VAC / 60Hz
EFFICIENCY 80 % typical at 115VAC Full Load
Fuse Internal and not user replaceable
Power Dissipation 50 Watts (typ)
Max Input AC Current 1.5 Arms @ 90VAC, 0.75 Arms @180VAC
INRUSH CURRENT (COLD START) 20 A @ 115VAC, 30 A(max) @230VAC

Shall start and function properly when under full load,
Power Supply Cold Start

with all combinations of input voltage, input frequency,

and operating temperature

Shall be able to withstand an ANSI/IEEE C62.41-1980
Power Supply Transient Immunity

6000V 200 ampere ring wave transient test with no

damage

Power Supply Line Surge Immunity

Shall be able to withstand 1.5 times nominal line voltage

for one cycle with no damage

Shall be able to function properly, without reset or visible
Power Supply Missing Cycle Immunity

screen artifacts, when ½ cycle of AC power is randomly

missing at nominal input

The power supply shall not produce audible noise that

would be detectable by the user. Audible shall defined to
Power Supply Acoustics

be in compliance with ISO 7779 (DIN EN27779:1991)

Noise measurements of machines acoustics. Power

Switch noise shall not be considered

Separate 3-prong NEMA 5-15P type plug. Length =
US Type Power Cable

1.8m. Connects to display.

Color = Black

Schuko CEE7-7 type plug.
European Type Power Cable

Length = 1.8m, Connects to display.

Color = Black

CCC Type Power Cable(Color, Black)

PSE Type Power Cable(Color, Black)

Separate 3-prong type plug.

Length = 1.8m. Connects to display.

Separate 2-prong NEMA 1-15P type plug. Length =

1.8m. Connects to display.

Power Saving Operation(Method) VESA DPMS Signaling

Power Consumption

On Mode < 50 W (max) / 40 W (typ)

Active Off < 2W
Recovery Time On Mode = N/A, Active Off < 3 sec

2-4 ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency 24 – 82 KHZ

50 – 85* HZ.

*1. FOR RESOLUTION 640X480, 800X600 AND

Vertical Refresh Rate

1024X768, THE VERTICAL REFRESH RATE UP
TO 85HZ; FOR THE REST RESOLUTIONS, THE
VERTICAL REFRESH RATE UP TO 75HZ.

*2. ALL THE 85HZ MODE PICTURE QUALITY

MIGHT BE WORSE THAN ≦75HZ MODE.

Maximum Pixel Clock 135 MHz

Sync Polarity Independent of sync polarity.

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Timing Table

Item Timing Analog Digital

1 640 x 350 @ 70Hz, 31.5kHz Yes Yes
2 640 x 400 @ 60Hz, 31.5kHz Yes Yes
3 640 x 400 @ 70Hz, 31.5kHz Yes Yes
4 640 x 480 @ 50Hz, 24.7kHz Yes Yes
5 640 x 480 @ 60Hz, 31.5kHz Yes Yes
6 640 x 480 @ 67Hz, 35.0kHz Yes Yes
7 640 x 480 @ 72Hz, 37.9kHz Yes Yes
8 640 x 480 @ 75Hz, 37.5kHz Yes Yes

9 640 x 480 @ 85Hz, 43.27kHz Yes Yes
10 720 x 400 @ 70Hz, 31.5kHz Yes Yes
11 800 x 600 @ 56Hz, 35.1kHz Yes Yes
12 800 x 600 @ 60Hz, 37.9kHz Yes Yes
13 800 x 600 @ 75Hz, 46.9kHz Yes Yes
14 800 x 600 @ 72Hz, 48.1kHz Yes Yes
15 800 x 600 @ 85Hz, 53.7kHz Yes Yes
16 832 x 624 @ 75Hz, 49.7kHz Yes Yes
17 1024 x 768 @ 60Hz, 48.4kHz Yes Yes
18 1024 x 768 @ 70Hz, 56.5kHz Yes Yes
19 1024 x 768 @ 72Hz, 58.1kHz Yes Yes
20 1024 x 768 @ 75Hz, 60.0kHz Yes Yes
21 1024 x 768 @ 85Hz, 68.67kHz Yes Yes
22 1152 x 864 @ 75Hz, 67.5kHz Yes Yes
23 1152 x 870 @ 75Hz, 68.7kHz Yes Yes
24 1280 x 1024 @ 60Hz, 63.4kHz Yes Yes
25 1280 x 1024 @ 75Hz, 79.97kHz Yes Yes
26 1280x 720 @ 60Hz, 45kHz (HDTV) Yes Yes

Primary Presets

1280x1024 @ 60Hz

User Presets
Number of User Presets (recognized timings) Available: 10 presets total in FIFO configuration

Changing Modes

Maximum Mode Change Blank Time for image stability : 5 seconds (Max), excluding “Auto Adjust” time ●

●

Under DOS mode (640 x 350, 720 x 400 & 640 x 400), it should recall factory setting when execute “Auto

Adjust” by “0-Touch™”

●

The monitor needs to do “Auto Adjust” the first time a new mode is detected
(see section “0-Touch™ Function Actions”)

●

While running Change Mode, Auto Adjust or Memory Recall, the image shall blank

2-5 FRONT PANEL CONTROLS AND INDICATORS

Front Panel Hardware Controls

Power Switch (Front Head) Power Control, soft Power Switch.
Power LED (Front Head) Green – ON

Orange – Active Off
Dark = Soft Power Switch OFF

Front Panel Controls (Head)

] [ 1 ] [ 2 ] [▲] [▼]

[

] Power

[
[ 1 ] Button 1
[ 2 ] Button 2

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[▲] Up arrow button
[▼] Down arrow button

Note: Power Button, Button 1 and Button 2 must be one­shot logic operation. (i.e. there should be no cycling)

Reaction Time OSD must fully appear within 0.5s after pushing Button 1

Short Cuts Function from the button(s)

[1] Main Menu
[2] Input Select

[▼] or [▲] to immediately activate Contrast menu. It should be change to Brightness

OSD by push button [2]

[▼]+ [▲] recall both of Contrast and Brightness to default

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

mode

[1] + [▼] + [▲] White Balance. (Not shown on user’s guide)

[1] + [▼] Power Lock
[1] + [▲] OSD Lock
[1] + [ ] Factory Mode

Remark : All the short cuts function are only available while OSD off

Main Menu Controls

Auto Image Adjust*
Contrast/Brightness

1

*3

Input Select

Analog 1, Analog 2, DVI-D

Color Adjust

9300K, 6500K(default), 5400K, 5000KUser Color [R, G, B]

Information

H Frequency, V Frequency, Resolution, Pixel Clock, Serial Number,
Model Number, “www.ViewSonic.com

Manual Image Adjust [Horizontal Size*

” ]

1

, H./V. Position*1, Fine Tune*1, Sharpness*2

Setup Menu

Language [English, French, German, Spanish, Italian, Finnish, Japanese, Simplified Chinese, Traditional

Chinese], Resolution Notice, Input Priority

[Analog1Æ Analog 2ÆDVI-D, Analog1ÆDVI-DÆ Analog 2, Analog 2Æ Analog 1ÆDVI-D, Analog

2ÆDVI-DÆ Analog 1, DVI-DÆ Analog 1Æ Analog 2, DVI-DÆ Analog 2Æ Analog 1, Disable], OSD
Position, OSD Timeout, OSD Background, OSD Pivot*

4

MEMORY RECALL

1

These functions are not available in Digital Mode

*

2

These functions are not available under Native Resolution Mode

*

*3

These functions setting can be recalled to default by [▼]+[▲]

*4

Both of automatically and manually OSD pivot should be available.

[Remark] Please refer to the detail in the Appendix C

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Function descriptions
OSD Lock short cuts function for the buttons

The OSD lock will be activated by pressing the front panel control buttons "(1), & (▲)" for 10 seconds. If the user
then tries to access the OSD by pressing any of the buttons "1", "▼", "▲", "2" a message will appear on the screen
for 3 seconds showing "OSD Locked". The OSD lock will be deactivated by pressing the front panel control
buttons "(1), & (▲)" again for 10 seconds.
Note1: When the OSD is locked will lock all functions.
Note 2: Status bar indicating OSD Lock or Unlock is in progress and when complete it will indicate “OSD
Locked”

Note 3: OSD Lock should not lock Power Button and Power Lock function
Power Lock short cuts function for the buttons

The power button lock will be activated by pressing the front panel control buttons "(1), & (▼)" for 10 seconds.
Locking the power button means that the user won't be able to turn off the LCD while the power button is locked.
If the user presses the power button while it is locked, a message will appear on the screen for 3 seconds showing
"Power Button Locked". It also means that with the power button locked, the LCD would automatically turn back
"On" when power is restored after a power failure. If the power button is not in the locked mode, then power
should return to it's previous state when power is restored after a power failure. The power button lock will be
deactivated by pressing the front panel control buttons "(1), & (▼)" again for 10 seconds.

Note 1: Status bar indicating Power Button lock or unlock is in progress and when complete it will indicate
“Power Button Locked”
Note 2: Power should only be lockable in the “On State”

Memory Recall Actions

Memory Recall action on the analog and digital mode as below

1. Recall white balance to factory setting

2. Set the factory defaults as shown in Section 4-8

3. Clean all the mode setting buffer

4. Execute Auto Image Adjust

Note: Memory Recall should have no effect for Language, Power Lock, User Color Settings

Resolution Notice Actions

1. Resolution Notice OSD should show on screen after changing to non-native mode for 30 sec

2. The OSD should disappear after 10 sec or by pushing button [1] or [2]
Resolution Notice function should be disabled when push button [2] under Resolution Notice OSD

0-Touch™ Function Actions

1. Execute Auto Image Adjust when new mode detected, and save the settings to buffer for further use

2. It should be reset by Memory Recall function

(Should not reset by power off, power unplug and others)
OSD Auto Save

The OSD shall save new settings when it is turned off by the user or when it times out. There shall not be a

separate save

2-6 TFT LCD PANEL

Panel Source Identify

(1) ID label - The panel code “S” for Samsung panel or “F” for Fujitsu panel should be shown on the lower
right side of ID label. (see Figure 2)
(2) UPC label - The panel code “S” for Samsung panel or “F” for Fujitsu panel should be shown on the lower
right side of UPC label. (see Figure 3)
(3) Main board - The panel code “S” for Samsung panel or “F” for Fujitsu panel should be shown on the main
board by F/W version sticker or silkscreen.

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Panel Characteristics :

st

1

Source Panel

Model number Samsung LTM190E1-L01
Type PVA 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 4H)
# of Backlights 4 CCFL edge-light (2 top / 2 bottom)
Backlight Life 50,000 Hours (Min)
Luminance (Center) – CT = 6500K, Contrast/
Brightness = Max

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

220 cd/m2 (Min after 30 minute warm up)
Brightness Uniformity 75% (Min) Entire Area
Contrast Ratio 600:1 (typ), 400:1 (min)
Color Depth 16 million colors (8 bit)
Viewing Angle (Horizontal, CR>10) Typical: 170º
Viewing Angle (Vertical, @ CR>10) Typical: 170º
Response Time
10%-90% @ Ta=25°C

25 ms (Tr= 15 ms, Tf = 10 ms) (typ)

35 ms (Tr= 20 ms, Tf = 15 ms) (max)
Panel Defects Please see Panel Quality Specifications.

nd

Source Panel

2

Model number Fujitsu FLC48SXC8V-11AA
Type MVA 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 Hours (Min)
Luminance (Center) – CT = 6500K, Contrast/
Brightness = Max

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

210 cd/m2 (Min after 30 minute warm up)
Brightness Uniformity 70% (Min) Entire Area
Contrast Ratio 700:1 (typ), 400:1 (min)
Color Depth 16 million colors (8 bit)
Viewing Angle (Horizontal, CR>10) Minimum: 170º (±85º)
Viewing Angle (Vertical, @ CR>10) Minimum: 170º (±85º)
Response Time
10%-90% @ Ta=25°C

16 ms (typ)

34 ms (max)
Mercury 3.0 mg (Max) per lamp
Panel Defects Please see Panel Quality Specifications.

2-7 IMAGE PERFORMANCE

Factory Defaults

Item Defaults Item Defaults
Contrast 50% OSD H. Position 50%
Brightness 100% OSD V. Position 50%
Color Temperature 6500K OSD Time Out 15 Sec

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Sharpness 100% OSD Background On
Input Priority Analog 1Æ Analog 2ÆDVI-D Resolution Notice Enabled
720x400/640x400 720x400

Luminance

Ly (Max) –Condition:

Contrast / Brightness = 100%
Color Temperature = 6500K

Same as the Luminance in section, 4-6 “TFT LCD
PANEL”

Ly (Def) –Condition:

Contrast / Brightness = Default

Lv (Def) / Lv (Max) x 100% ≧ 90%

Color Temperature = 6500K

Display Size

Horizontal Display Size, Primary Preset Full Screen
Vertical Display Size, Primary Preset Full Screen

Saturation

Contrast / Brightness = Default
Test pattern = 32-gray
Contrast / Brightness = 100%
Test pattern = 32-gray

No visible saturation

6~8 - level saturation

Preset Color Temperatures

Preset 1

CCT (typ) = 9300K ( Wx = 0.283, Wy = 0.298 )

CCT (max) = 10925K, CCT (min) = 8086K

Preset 2 (Primary)

CCT (typ) = 6500K ( Wx = 0.313, Wy = 0.329 )

CCT (max) = 7180K, CCT (min) = 5931K

Preset 3

CCT (typ) = 5400K ( Wx = 0.335, Wy = 0.350 )

CCT (max) = 5920K, CCT (min) = 4935K

Preset 4

CCT (typ) = 5000K ( Wx = 0.346, Wy = 0.359 )

CCT (max) = 5400K, CCT (min) = 4653K
Preset Color Temperature
Adjustability

Each color preset shall be adjustable. Red, Green, and Blue shall be

individually controlled.

Video Cards Compatibility

Peaking Performance : Peaking is not adjustable

Raster Artifacts

●

Video Artifacts : No visible streaking, sag, or smearing artifacts when driven by the specified video cards
in the primary mode and after user adjustment to best condition

●

Power Supply, and Grounding Artifacts : No visible artifacts in any specified video mode within the

horizontal or vertical frequency range of the monitor

●

Temperature Drift : Image shall not drift or lose fine-tune adjustment

2-8 MECHANICAL

Dimension (Desktop)

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

Dimension (Head Only / Wall Mount)

Width 416 mm (16.4 inch)
Height 341 mm (13.4 inch)
Depth 55 mm (2.2 inch)
Monitor Weight 5.1 kg / 11.22 lbs

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Ergonomics

Tilt Up From 0º up to ≧20º+/-2º

Tilt Down From 0º down to -3º ~ -5 º
Swivel Right 45 degrees
Swivel Left 45 degrees
Height Adjust 0~110 mm
Pivot 0~90 degrees (Clockwise)

Cabinet Material

Display Head Plastic Material PC+ABS (meets UL94V0 degree)
Neck/Base Plastic Material PC+ABS (meets UL94V0 degree)

All internal plastic cabinet components shall be in compliance

Internal Plastic Cabinet Components

with the requirements of TCO’03 (VP191s) / TCO’99
(VP191b/VP191b-H)

Front Bezel Color The reference for the bezel is the Silver (VP191s) / Midnight-

Gray (VP191b/VP191b-H) color chip provided by ViewSonic
The color difference between any two cabinet

components shall be less than 0.80 “Delta E”,

in the 1976 CIE L*a*b Colorspace.
Neck, Base, Speaker Cover,
Rear Cover and Rear Logo Color

The reference for the Neck, Base, Speaker Cover, Rear Cover

and Rear Logo Color is the Black (VP191s) / Midnight-Gray

(VP191b /VP191b-H) color chip provided by ViewSonic.

The color difference between any two cabinet

components shall be less than 0.80 “Delta E”,

in the 1976 CIE L*a*b Colorspace.

The color drift due to UV-Light shall be less than 3.0 “Delta

Cabinet Color Drift Due To UV-Light

E” in the 1976 CIE L*a*b colorspace. Testing shall be

performed according to the requirements of ASTM Test

Method D4459-93.
Cabinet Texture Mold-Tech # 11010 used on all external textured surfaces.

Samples

The supplier shall submit textured color chips, plastic material

specifications, and Material Safety Data Sheets for approval.

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3. Front Panel Function Control Description

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

Front Control Panel
shown below in detail

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

Scrolls through menu options and
adjusts the displayed control.

Also a shortcut to display the
Contrast adjustment control
screen.

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

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Do the following to adjust the screen image:

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

1

NOTE:

All OnView menus and adjustment screens disappear automatically
after about 15 seconds. This is adjustable through the OSD timeout setting in the
setup menu.

2

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

3

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

The command line at the
bottom of the control screen
tells what to do next from this
screen. You can toggle
between control screens,
adjust the selected option, or
exit the screen.

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.)

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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

sizes and centers the screen image

automatically.

Contrast

adjusts the difference between the image background

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

Brightness

Input Select

adjusts background black level of the screen image.

toggles between inputs if you have more than one

computer connected to the VP191/VP191b/VP191s.

Color Adjust

color temperatures and

provides several color adjustment modes: preset

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

5000K

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

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

color.

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Control Explanation

User Color

and blue (B)

1

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

2

To adjust selected color, press ▲ or ▼.

Important

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

.

: 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.

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)

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

adjusts the width of the screen image.

image left or right and up or down.

moves the screen

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Control Explanation

Fine Tune

sharpens the focus by aligning the text and/or graphic

characters.

NOTE:

Sharpness

Try Auto Image Adjust first.

adjusts the clarity and focus of the screen image.

Setup menu displays the menu shown below:

Language

allows you to choose the language used in the menus

and control screens.

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.

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Control Explanation

Input Priority

If multiple computers will be connected to the display,
this function can be used to select which computer has priority
Depending on the selected Input Priority, the display will do a one
time detection for available inputs when first powered on.

For example: If the Input Priority setting is D-SUB=>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 of only one signal being 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 setting when the display is first turned on. The
user will need to control all the port settings manually under this
condition. Inputs can be switched quickly by pressing the "Up" arrow
button on the front panel controls.

OSD Position

allows you 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.

OSD Background

On/Off

allows you to turn the On-Screen Display

background On or Off.

OSD Pivot

This function is used to rotate the OSD menu,

when the display is changed from Landscape to Portrait mode.

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.

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4. Circuit Description

1. Power supply (DC/DC Converter)

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

additional transistor component.

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

would be needed with lower frequency switch regulator.

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 allows 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.

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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, the

gm5110/20 devices simplify and reduce the cost of LCD monitors while maintaining a high-degree of flexibility and

quality.

gm5110/5120 System Design Example

4. LVDS (THC63LVDM83A)

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.

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5. Adjusting Procedure

5-1 Function Test and Alignment Procedure

5-1-1 Product

19 LCD Monitor

5-1-2 Test Equipment

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

5-1-3 Hot Key

1). All Mode Reset:

Press  ,   buttons simultaneously and Power on with signal, hold on for 3 seconds. Then the

screen will show All Mode Reset.

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2). Burn In Mode:

Press  ,   buttons simultaneously and Power on without signal, hold on for 3 seconds. Then the

screen will show Burn In Mode. Press   button, you can find the information about this monitor.

1

3). White Balance:

Set the screen on 640*480@60Hz resolution pure black and white pattern, no other color. Press  , 

 and   simultaneously.

1

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4). OSD Lock :

Press   and   buttons simultaneously for 10 seconds, and the OSD will lock. Repeat the action, and

1

the OSD will unlock.

5). Power Lock :

Press   and   buttons simultaneously for 10 seconds, and the Power will lock. Repeat the action,

1

and the Power will unlock.

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6). Contrast and Brightness Recall :

Press   and   buttons simultaneously, and the contrast and brightness will restore the factory

defaults.

7). Test Mode(720*400)/Graphic Mode (640*400) exchange :

Press   and   buttons simultaneously.

1

2

5-1-4 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, R.G.B. 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)

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