ViewSonic VLCDS25973-2W User manual

Service Manual
Model No. VLCDS25973-2W/3W
19” Color TFT LCD Display
ViewSonic VP191b/s-1/-2-1
ViewSonic
381 Brea Canyon Road, Walnut, California 91789 USA - [phone]
(VP191b/s_SM_678 Rev. 1dApr.2005)

Copyright
Copyright
¤
2005by 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 02/11/04 Initial Release DCN-4207 Angela Luh
DCN Number ECR Number
Documents Number Description of Changes EditorRevision SM Editing Date
1a 06/28/03 3379 Initial Release F. Fellen
1c 10/18/04 4775
1b 04/23/04 4290 A. Lu
Cost Down Chassis change
4801 Change Panel From FJ FLC48SXC8V-11A SXGA 25ms
To FJ FLC48SXC8V-11AA 16ms A. Lu
4226
1d 04/12/05
5241
5056 Change Panel From FJ FLC48SXC8V-11AA 16ms
To AUO M190EN03 V0 8ms and Change scalar to gm5321 A. Lu

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 Exploded Parts List
11. PCB Layout Diagrams
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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. LCDModule 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 CMOSLSI isusedinthis 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
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(11) After installation of theTFT Module intoan enclosure(LCDmonitor 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 theTFT 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 fordisposal.
(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 theCCFL to a HazardousVoltage Circuit.
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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 4CCFL edge-light (2top / 2bottom)
Backlight Life 40,000 Hours (Typ)
50,000 Hours (Min)
Luminance (Center) –CT = 6500K,
Contrast/ Brightness = Max 250 cd/m2 (Typ after 30 minute warm up) 200 cd/m2 (Min after 30 minute warm up)
Brightness Uniformity 80% (typ) / 75% (Min) Entire Area
Contrast Ratio 800:1 (typ), 500:1 (min)
Color Depth 16 million colors (8bit)
Viewing Angle (Horizontal, CR>10)Typical: 170º
Viewing Angle (Vertical, @ CR>10)Typical: 170º
Response Time
10%-90% @ Ta=25°C
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)
Mercury 3.0 mg (Max) per lamp
Panel Defects Please see Panel Quality Specifications.
Displayable Color -16.7M Colors
Max. Pixel Clock -135MHz
Re-Scaling -Yes
I/O Connectors -AC power in
-VGA in D-Sub 15 pin x 2
-DVI-D Connector x1
Power Saving -VESA DPMS Standard
Power Consumption -On Mode: 40Watt (typ.); 50 Watt (Max)
-Active Off Mode: ≦2W (Max)
Ergonomics
Tilt Up ≧25º
Tilt Down From 0ºdown 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
2. Specification
-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 x460.0mm x238.0mm
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
1640 x 350 @ 70Hz, 31.5kHz Yes Yes
2640 x 400 @ 60Hz, 31.5kHz Yes Yes
3640 x 400 @ 70Hz, 31.5kHz Yes Yes
4640 x 480 @ 50Hz, 24.7kHz Yes Yes
5640 x 480 @ 60Hz, 31.5kHz Yes Yes
6640 x 480 @ 67Hz, 35.0kHz Yes Yes
7640 x 480 @ 72Hz, 37.9kHz Yes Yes
8640 x 480 @ 75Hz, 37.5kHz Yes Yes
9640 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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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
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
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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 15 seconds. This is adjustable through the OSD timeout setting in the
setup menu.
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 @ 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.)
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.
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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 adjusts background black level of the screen image.
Input Select toggles between inputs if you have more than one
computer connected to the VP191/VP191b/VP191s.
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.
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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
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.
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Fine Tune sharpens the focus by aligning the text and/or graphic
characters.
NOTE: Try Auto Image Adjust first.
Sharpness 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.
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.
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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.
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.
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 you to turn the On-Screen Display
background On or Off.
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Circuit Description
1. Power supply (DC/DC Converter)
The AP1501 is monolithic IC designed for M/B DC/DC converter, and ownsthe ability of driving a 3A load without
any additional transistor component.
The AP1501 operatesat a switching frequency of 150KHz and thus allowssmaller-sized filter componentsthan what
would be needed with lower frequency switch regulator.
2. Flash Memory
The Pm39LV020R is a 2Megabit, 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 2Megabit 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.
4. Circuit Description
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2. Flash Memory
The Pm39LV020R is a 2Megabit, 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 2Megabit 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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4.LVDS (THC63LVDM83A)
The THC63LVDM83A transmitter converts 28 bits of CMOS/TTL data into LVDS (Low Voltage Differential
Signaling) data stream. Aphase-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.
gm5321 System Design Example
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 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 gm5321 devices simplify and reduce the cost of LCD monitors while maintaining a high-degree of flexibility and
quality.
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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: xxxxxxxAxxxx
If the 8th serial code is letter “A”, that means this is VP191 (gm5321) monitor.
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.”
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.
5. Adjustment Procedure
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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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