ViewSonic VLCDS25973-2W, VLCDS25973-3W, VP191S-1, VP191S-2, VP191b Service Manual

Service Manual

ViewSonic VP191b/s-1/-2-1

Model No. VLCDS25973-2W/3W

19” Color TFT LCD Display

ViewSonic

(VP191b/s_SM_678 Rev. 1d Apr. 2005)



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

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.

DCN Number ECR Number

06/28/03

04/23/04

10/18/04

04/12

/05

Revision History

Documents Number

3379

4290

4775

5241

4226

4801

5056

Initial Release

Cost Down Chassis change

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

Change Panel From FJ FLC48SXC8V-11AA 16ms To AUO M190EN03 V0 8ms and Change scalar to gm5321

Description of Changes EditorRevision SM Editing Date

F. Fellen

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. Adjustment Procedure

6. Troubleshooting Flow Chart

7. Recommended Spare Parts List

8. Exploded Diagram and Exploded Parts List

9. Block Diagram

10. Schematic Diagrams

11. PCB Layout Diagrams

3 5

11 14

43 54 69 70

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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 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.

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(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.

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2. Specification

LCD Technology

Model number AUO M190EN03 V.0 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 3H) # of Backlights 4 CCFL edge-light (2 top / 2 bottom) Backlight Life 40,000 Hours (Typ)

Luminance (Center) – CT = 6500K, Contrast/ Brightness = Max Brightness Uniformity 80% (typ) / 75% (Min) Entire Area Contrast Ratio 800:1 (typ), 500:1 (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

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

Displayable Color -16.7M Colors

50,000 Hours (Min) 250 cd/m2 (Typ after 30 minute warm up) 200 cd/m2 (Min after 30 minute warm up)

Black to White

20 ms (Tr= 15 ms, Tf = 5 ms) (typ) 40 ms (Tr= 25 ms, Tf = 15 ms) (max)

Gray to Gray

8 ms (typ)

Max. Pixel Clock -135MHz

Re-Scaling -Yes

I/O Connectors -AC power in

-VGA in D-Sub 15 pin x 2

-DVI-D Connector x 1

Power Saving -VESA DPMS Standard

Power Consumption -On Mode: 40 Watt (typ.); 50 Watt (Max)

-Active Off Mode: ≦2 W (Max)

Ergonomics

Tilt Up ≧25º 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)

Environmental -Operating Temperature: 0o ~ 40oC/32o ~ 104oF

-Operating Related Humidity: 20% ~ 90% RH Non-condensing

-Storage Temperature: -20o ~ 60oC/ -4o ~ 140oF

-Storage Related Humidity: 5% ~ 90% RH Non-condensing

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Mounting Interface -VESA Flat Panel Monitor Physical Mounting Interface

Power Supply -Internal Power Supply

-Power Dissipation: 50 Watts (typ.)

Dimension (W*H*D) -416.0mm x 460.0mm x 238.0mm

Weight -7.5 kgs/16.5 lbs

Agency Approval -UL, cUL, FCC-B, CB, CE, NOM, TUV/GS, TUV ERGO

(covers ISO13406-2 & MPRII), TCO’03 (VP191s-2), TCO’99 (VP191b-2 / VP191b-2H), GOST-R + 20 ORIGINAL COPIES HYGIENIC, SASO, VCCI, BSMI, CCC, (PSB), (C-TICK), Green Mark, Energy Star

Compatible Modes

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

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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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Power On/Off

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Do the following to adjust the screen image:

To display the Main Menu, press button [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.

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

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.

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

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)

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

Circuit Description

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.

2. Flash Memory

The Pm39LV020R is a 2 Megabit, 3.3 Volt-only Flash Memory organized as 262,144 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 2 Megabit memory array is divided into uniform 4Kbyte sector or uniform 64Kbyte blocks 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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2. Flash Memory

The Pm39LV020R is a 2 Megabit, 3.3 Volt-only Flash Memory organized as 262,144 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 2 Megabit memory array is divided into uniform 4Kbyte sector or uniform 64Kbyte blocks 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. GM5321

The gm5321 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

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 gm5321 devices simplify and reduce the cost of LCD monitors while maintaining a high-degree of flexibility and quality.

gm5321 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. Adjustment Procedure

5-1 Product

- 19” LCD Monitor

- This Chapter is for VP191 (gm5321) monitor.

- The method to identify VP191 (gm5321) monitor:

VP191 Serial No. coding rule: xxxxxxxA

If the 8

5-2 Test Equipment

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

5-3 Hot Keys

1) All Mode Reset:

Press “b”, “a” buttons simultaneously and “Power on” with signal, hold on for 3 seconds.

Then the screen will show “All Mode Reset.”

serial code is letter “A”, that means this is VP191 (gm5321) monitor.

xxxx

2). Burn In Mode:

Press “b” and“a” buttons simultaneously and “Power on” with signal, hold on for seconds. Then the screen will show “Burn In Mode”. Press “ 1 ” button, you can find the information about

this monitor.

3). Factory Mode: Press “ 1 ” and “Power” buttons simultaneously to enter Factory Mode. The Method to check if

Factory Mode is enabled: Press “ 1 ” and “a” buttons simultaneously, if the message of “DMT

XXX” appears, that means Factory Mode is enabled.

4). White Balance for VP191 with GM5321 Scaler:

Enter Factory Mode first. Set the Screen on 1280*1024@60Hz resolution and 16 Gray Scale Pattern. Press “ 1 ”, “b” and “a” buttons simultaneously.

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5). OSD Lock:

Press “ 1 ” and “a” buttons simultaneously for 10 seconds, and the OSD will lock.

Repeat the action, and the OSD will unlock.

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6). Power Lock:

Press “ 1 ” and “b” buttons simultaneously for 10 seconds, and the Power will lock.

Repeat the action, and the Power will unlock.

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7). Contrast and Brightness Recall:

Press “b” and “a” buttons simultaneously, and the contrast and brightness will restore the

factory defaults.

8). Test Mode (720*400) / Graphic Mode (640*400) exchange: Press “ 1 ” and “ 2 ” buttons simultaneously.

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5-4 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)

5-5 Test Display Modes & Pattern

5-5.1 Compatible Modes for GM5321 Saler

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

1280 x 720 @ 60Hz, 45kHz

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

1280 x 720 @ 60Hz, 45kHz

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5.5.2 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

Figure 2

distinguishable.

3 Boundary Horizontal & Vertical

Thickness

Horizontal and Vertical position of

video should be adjustable to be

Figure 3

within the screen frame.

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

Figure 4, 5, 6

should be normal.

5 Screen Uniformity & Flicker Full White Should be compliant with the spec. Figure 7

6 Dead Pixel/Line White Screen & Dark

Screen

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

The numbers of dead pixels should

be compliant with the spec.

Figure 7, 8

Figure 9

white and black pattern, no other

color.

Fine Line Morie Pattern (Figure1) 16 Gray Scale Pattern (Figure2)

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

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

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

Black-White Pattern (Figure 9)

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5-6 Function Test and Alignment Procedure

5-6.1 All Modes Reset

You should do “All Mode Resent” (Refer to Chapter 6-3) first. This action will allow you to erase all end-

user’s settings and restore the factory defaults.

5-6.2 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.

5-6.3 Firmware and DDC

Test Pattern: Burn In Mode (Refer to Chapter 6-3)

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

- Make sure the S/N is the same as the Spec. label.

- Make sure the model name is correct.

5-6.4 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.

5-6.5 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.

5-6.6 White Balance for GM5321 scaler

Test Signal: 1280-1024 @ 60Hz

Test Pattern: 16 Gray Scale

- Refer to Chapter 6-3

5-6.7 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.

5-6.8 Screen Uniformity and Flicker

Test Signal: 1280*1024@60Hz

Test Pattern: Full White Pattern

- Check and see if it is in normal condition.

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5-6.9 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.

5-6.10 Mura

Test Pattern: White, RGB, Black & White

Test Tool: 8% ND filter

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

5-6.11 Check for Secondary Display Modes

Test Signal for GM5321 Scaler:

Analog : 640*350@70Hz; 640 x 400 @ 60/70Hz

640*480@50/60/67/72/75/85Hz;

720*400@70Hz; 800*600@56/60/72/75/85Hz;

832*624@75Hz, 1024*768@60/70/72/75/85Hz;

1152*864@75Hz, 1152*870@75Hz;

1280*1024@75Hz, 1280*720@60Hz

Digital : 640*350@70Hz; 640 x 400 @ 60/70Hz

640*480@50/60/67/72/75/85Hz;

720*400@70Hz; 800*600@56/60/72/75/85Hz;

832*624@75Hz, 1024*768@60/70/72/75/85Hz;

1152*864@75Hz, 1152*870@75Hz;

1280*1024@75Hz, 1280*720@60Hz

- Normally when the primary mode 1280*1024@60Hz is well adjusted and

compliant with the specification, the secondary display modes will also be

compliant with the spec. It is still necessary to check with the general test pattern

to make sure every secondary is compliant with the specification.

5-6.12 All Modes Reset

After final QC step, we have to erase all saved changes again and restore the factory

defaults. You should do “All Mode Reset” (Refer to Chapter 6-3) again.

5-6.13 Power Off Monitor

Turn off the monitor by pressing “Power” button, and turn off the “Switch” that is on the back of the

monitor.

ViewSonic Corporation Confidential

Do Not Copy VP191b/s-1/-2

+ 57 hidden pages

ViewSonic VLCDS25973-2W, VLCDS25973-3W, VP191S-1, VP191S-2, VP191b Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual