ViewSonic VX910 - 19" LCD Monitor User manual

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

Copyright
Copyright
¤
2004by ViewSonic Corporation. All rights reserved. No partof this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or
computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual or otherwise, without the prior written permission of ViewSonic Corporation.
Disclaimer
ViewSonic makes no representations or warranties, either expressed or implied, with respect to the
contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular
purpose. Further, ViewSonic reserves the right to revise this publication and to make changes from time
to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or
changes.
Trademarks
ViewSonic is a registered trademark of ViewSonic Corporation.
All other trademarks used within this document are the property of their respective owners.
Optiquest is a registered trademark of ViewSonic Corporation.
Revision History
Revision Date Description Of Changes Approval
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1a 06/07/04 Initial Release DCN-4474 Angela Lu

TABLE OF CONTENTS
2. Specification
3. Front Panel Function Control Description
4. Circuit Description
6. Trouble Shooting Flow Chart
9. Block Diagram
10. Schematic Diagrams
7. Recommended Spare Parts List
1. Precautions and Safety Notices
5. Adjusting Procedure
8. Exploded Diagram And Spare Parts List
11. PCB Layout Diagrams
1
2
3
10
22
30
36
40
42
44
50
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1. Caution :
No modification of any circuit should be attempted . Service work should only be performed after you
are thoroughly familiar with all of the following safety checks and servicing guide line
2. Safety Check :
Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter
circuit. These voltage are exposed in such areas as the associated transformer circuits .
3. POWER SUPPLY REQUIREMENTS
The internal power converter for this display utilizes AC and DC cords , AC cord is detachable , but DC
cord is permanently attached . Any attempt to replace another power board could result in serious problem
on the display .
4. LEAKAGE CURRENT HOT CHECK
4-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this check.
4-2 Connect a 1500 ohm , 10 watt resistor , paralleled by a 0.15uF capacitor between each metallic part
and a good earth ground
4-3 Use an AC voltmeter with 1000 ohm / volt or more sensitivity and measure the AC voltage across
the combination 1500 ohm resistor and 0.15uF capacitor.
4-4 Move the resistor connection to each exposed metallic part and measure the voltage.
4-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement.
4-6 Voltage measured must not exceed 1.5 volt RMS, from any exposed metallic part to the ground.A
leakage current tester may be used in the above hot check, in which case any circuit measured must
not exceed 1.0 milliamp. In the case of a measurement exceeding the 1.0 milliamp value, a rework
is required to eliminate the chance of a shock hazard .
To Metal Parts
V
AC VOLTMETER
1500 10W
0.15u
.
Earth Ground
1. Precautions and Safety Notices
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Mechanical :
Dimension ( W x H x D ) mm
Set : a. with stand :430.8 x 468.4 x 201 mm
b. Without stand :430.8 x 370.2 x 66.2mm
Slim bezel :19.0 / 19.0 / 22.0 /22.0
Base (L X W) :286 x 201 mm
Packing : ( W x H x D ) mm :496 x 532 x 247 mm
Weight : Net / Gross ( Kg ) :6.7 / 8.5
Wall Mount (VESA) :100 x 100 mm
LCD Panel type :LG / LM190E03 Rev.03
Max. resolution (HxV) :1280 x 1024
Nominal picture size (HxV) :376.3 mm x 301.1 mm
Display colors :16.2 M ( 6 bit + dithering )
Dot pitch :0.264 mm
Response time :4+12/ 16ms (Tr + Tf / typical)
Brightness (100% white) :Typical : 250 cd/m² , Min. 200cd/m²
Contrast :Typical : 500:1, Min. 300:1
Viewing angle :70 / 70/70 / 70 (L/R/T/B CR>=10)
Synchronization :Fh = 31~82 KHz / Fv=50~75Hz
Presets :26 timing modes
OSD Languag :8 kinds languages
Color Temperature :sRGB , 6500°K (default) / 9300°K
/5400°K / User R,G,B
Plug & Play :DDC1/2B interface
Scaler chip :Mstar MST8131a
AC Power range :90 V ~ 264 V, 50 Hz / 60 Hz
Power consumption :< 40W green / < 1W amber
(On / Off mode)
2. Specification
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AdjustingtheScreen Image
Use the buttons on the front control panel to display and adjust the OnView®
controls which display on the screen. The OnView controls are explained at the
top of the next page.
Front Control Panel
shown below in detail
Main Menu
With OnView controls
Scrolls through menu options and
adjusts the displayed control.
Also a shortcut to display the
Contrast adjustment control
screen.
Power
On/Off
Displays the control
screen for the highlighted
control.
Also toggles between two
controls on some
screens.
Also a shortcut to toggle
between analog and
digital connections.
Power light
Green = ON
Orange = Power
Saving
Displays the Main Menu
or exits the control screen
and saves adjustments
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3. Front Panel Function Control Description
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Do the following to adjust the screen image:
1To display the Main Menu, press button [1].
NOTE: All OnView menus and adjustment screens disappear automatically
after about 30 seconds.
2To select a control you want to adjust, press ▲or ▼to scroll up or down the
Main Menu.
3After the control is selected, press button [2]. A control screen like the one
shown below appears.
4To adjust the control, press the up ▲or down ▼buttons.
5To save the adjustments and exit the menu, press button [1] twice.
The following tips may help you optimize your display:
• Adjust your computer's graphic card so that it outputs a video signal 1280 x
1024 @ 60 Hz to the LCD display. (Look for instructions on “changing the
refresh rate” in your graphic card's user guide.)
• If necessary, make small adjustments using H POSITION and V POSITION
until the screen image is completely visible. (The black border around the
edge of the screen should barely touch the illuminated “active area” of the
LCD display.)
The line at the
bottom of the
screen tells you
what you can do
next: Exit or select
the Brightness
control.
1: Exit 2 : Brightness
Contrast
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Main Menu Controls
Adjust the menu items shown below by using the up ▲ and down ▼ buttons.
Control Explanation
Auto Image Adjust automatically sizes, centers, and fine tunes
the video signal to eliminate waviness and distortion.
Press the [2] button to obtain a sharper image.
If this function does not work on your LCD display, then
lower the video refresh rate to 60 Hz and set the resolution
to its
Contrast adjusts the difference between the image background
(black level) and the foreground (white level).
Brightness adjusts background black level of the screen image.
Input Select allows you to toggle between an analog and a
digital signal.
pre-set value.
functions are not available for DVI input.
NOTE:
1. Auto Image Adjust works with most common video cards.
2. The Auto Image Adjust and most Manual Image Adjust
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Color Adjust provides several color adjustment modes: preset
color temperatures and RGB which allows you to adjust red (R),
green (G), and blue (B) separately. The factory setting for this
product is 6500K (6500 Kelvin).
9300K — Adds blue to the screen image for cooler white (used
in most office settings with fluorescent lighting).
6500K — Adds red to the screen image for warmer white and
richer red.
5400K — Adds green to the screen image for a darker color.
User Color — Individual adjustments for red (R), green (G),
and blue (B).
1To select color (R, G or B) press button [2].
2To adjust selected color, press ▲or ▼.
Important: If you select RECALL from the Main Menu when
the product is set to a Preset Timing Mode, colors return to the
6500K factory preset.
Control Explanation
SRGB
9300K
6500K
5400K
User Color
Color Adjust
sRGB —sRGB is quickly becoming the industry standard for color
management, with support being included in many of the latest
applications. Enabling this setting allows the LCD display to
more accurately display colors the way they were originally
intended. Enabling the sRGB setting will cause the Contrast and
Brightness adjustments to be disabled.
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Information displays the timing mode (video signal input)
coming from the graphics card in your computer. See your
graphic card’s user guide for instructions on changing the
resolution and refresh rate (vertical frequency).
NOTE: VESA 1280 x 1024 @ 60 Hz (recommended) means
that the resolution is 1280 x 1024 and the refresh rate is 60
Hertz.
Manual Image Adjust displays the Manual Image Adjust menu.
The Manual Image Adjust controls are explained below:
Horizontal Size adjusts the width of the screen image.
Horizontal Position moves the screen image left or right.
Vertical Position moves the screen image up or down.
Fine Tune sharpens focus by aligning the illuminated text and/
or graphic characters.
Sharpness adjusts the clarity and focus of the screen image.
Control Explanation
H . / V . Position
Manual Image Adjust
1: Exit 2 : Select
H . Size
Fine Tune
Sharpness
H. Frequency: 31.47 KHz
Information
V. Frequency: 31.47 Hz
Pixel Clock: 24.80 MHz
Resolution: 640 x 480
Model No. :
Serial No. :
www.viewsonic.com
1: Exit
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Setup Menu displays the menu shown below.
The Setup Menu controls are explained below:
Language allows you to choose the language used in the menus
and control screens.
Resolution Notice displays the Resolution Notice menu shown
below.
Resolution Notice advises the optimal resolution to use.
OSD Position allows you to move the on-screen display menus
and control screens.
OSD Timeout sets the length of time an on-screen display
screen is displayed. For example, with a “15 second” setting, if
a control is not pushed within 15 seconds, the display screen
disappears.
OSD Background allows you to turn the On-Screen-Display
background on or off.
Control Explanation
Memory Recall returns adjustments to the original factory
settings if the display is operating in a factory Preset Timing
Mode listed in this user guide.
Exception: This control does not affect changes made with the
User Color control, Language and Power Lock setting.
Language Select
Setup Menu
Resolution Notice
OSD Position
OSD Time Out
OSD Background
1: Exit
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Short Cuts Function from the button(s)
[1] Main Menu
[2] Input toggle (Analog or Digital) or Auto Image Adjust.
[ ] 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 shownon user’s guide)
[1] + [ ]Power Lock
[1] + [ OSD Lock
[2] + [ ] Factory Mode
Remark : All the short cuts function are only available while OSD off
▲
▼
▲
▼
▲
▼
▲
▼
]
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1. Outline
1.1 Power On/Off, 2Enter button (INPUT SELECT),up arrow-button, down arrow button, 1MENU button,
button on the front panel.
1.2 D-sub 15pin connector, DVI-I connector and AC-IN jack are located on the back side of the cabinet.
1.3 OSD menu includes the following function;
Auto Image Adjust (only active under analog input)
Contrast/Brightness
Audio Adjust
Color Adjust
Information
Manual Image Adjust
Setup Menu
Memory Recall
1.4 Contrast and Brightness can be directly controlled with UP / DOWN key.
2. CONNECTORS
2.1 AC inlet : CEE22 typed connector
2.2 Video signal connector for analog input: 15P Mini D-Sub
PIN MNEMONI SIGNAL
1RV Red Video
2GV Green Video
3BV Blue Video
4NC None
5GND Ground (DDC
return)
6RG Red GND
7GG Green GND
8BG Blue GND
9+5V +5V (for DDC)
10 SG Sync GND
11 NC None
12 SDA DDC Data
13 HS Horizontal Sync
14 VS Vertical Sync
15 SCL DDC Clock
CN6
DB15HD
1 6 2 7 3 8 4 9 5
11 12 13 14 15 10
16 17
4. Circuit Description
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2.3 Video signal connector for digital input: 24pin DVI-D connector
CN9
DVI-D
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
RX2-
RX2+
GND
RX4-
RX4+
SCL
SDA
VS
RX1-
RX1+
GND
RX3-
RX3+
5V
GND
HP
RX0-
RX0+
GND
RX5-
RX5+
GND
RXC+
RXC-
3. ELECTRICAL SPECIFICATIONS
3.1 Standard conditions
Display Area 404.2 x 330.0 mm
Video Signal 0.7Vpp
Contrast Max.
Brightness Max.
Ambient 20 +/-5 °C
Input AC
Warming up > 30 min
Display 1280 x 1024
Pin No.
Signal Name Description
1RX2-TMDS negative differential input, channel 2
2RX2+ TMDS positive differential input, channel 2
3GND Logic Ground
4RX4-Reserved. No connection
5RX4+ Reserved. No connection
6SCL DDC2B Clock
7SDA DDC2B Data
8VS Reserved. No connection
9RX1-TMDS negative differential input, channel 1
10 RX1+ TMDS positive differential input, channel 1
11 GND Logic Ground
12 RX3-Reserved. No connection
13 RX3+ Reserved. No connection
14 +5V Power
15 GND Logic Ground
16 HP SENSE Pin, Pull High
17 RX0-TMDS negative differential input, channel 0
18 RX0+ TMDS positive differential input, channel 0
19 GND Logic Ground
20 RX5-Reserved. No connection
21 RX5+ Reserved. No connection
22 GND Logic Ground
23 RXC+ TMDS positive differential input, reference clock
24 RXC-TMDS negative differential input, reference clock
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3.2 POWER
3.2.1 Power supply
Input voltage 100~240Vac
Power frequency 50~60Hz
<1.5Arms@90Vac
<0.8Arms@180Vac
Input current
Inrush current
50A(Max) at 120Vac(cold start)
Power consumption 35W(typical);40Watts(Max)
3.2.2 Power Management
State Power Indicator
On 35Watts Green
Standby
< 1Watts Amber
Off <1Watts Off
3.3 Acceptable timing
If the timing is within following specification, this LCD display can automatically function with a certain
position.
Horizontal: Sync frequency: 30~82kHz
Vertical: Sync frequency: 56~75Hz
3.4 Signal level and input impedance
3.4.1 Video Signal level: 0.7Vp-p Video signal.
3.4.2 Sync Signal level
H/V Separate: TTL level
3.4.3 Input impedance
Analog video input: 75 ohm
Digital video input: 100 ohm
Sync input: > 1 k ohm
Audio input: 10K ohm
4. SIGNAL CABLE:
Signal cable with Mini D-Sub 15P connectors at both ends. Length: 1.8 meter.
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Appendix E: Analog EDID
Time: 16:44:01
Date: Mon Dec 01, 2003
______________________________________________________________________
______________________________________________________________________
VIEWSONIC CORPORATION
EDID Version # 1, Revision # 3
DDCTest For: ViewSonic VX910
______________________________________________________________________
______________________________________________________________________
128 BYTES OF EDID CODE:
0 1 2 3 4 5 6 7 8 9
________________________________________
0 | 00 FF FF FF FF FF FF 00 5A 63
10 | 19 3C 01 01 01 01 01 0D 01 03
20 | 0E 26 1E 78 2E A2 65 A3 57 4C
30 | 9D 25 11 50 54 BF EF 80 81 80
40 | 71 4F 61 59 45 59 31 59 01 01
50 | 01 01 01 01 30 2A 00 98 51 00
60 | 2A 40 30 70 13 00 78 2D 11 00
70 | 00 1E 00 00 00 FF 00 50 31 54
80 | 30 33 30 31 30 30 30 30 31 0A
90 | 00 00 00 FD 00 32 55 1E 52 0E
100 | 00 0A 20 20 20 20 20 20 00 00
110 | 00 FC 00 56 58 39 31 30 0A 20
120 | 20 20 20 20 20 20 00 8A
______________________________________________________________________
(08-09) ID Manufacturer Name = VSC
(11-10) Product ID Code = 3C19
(12-15) Last 5 Digits of Serial Number = Not Used
(16) Week of Manufacture = 01
(17) Year of Manufacture = 2003
(10-17) Complete Serial Number = See Descriptor Block
(18) EDID Version Number = 1
(19) EDID Revision Number = 3
(20) VIDEO INPUT DEFINITION:
Analog Signal
5. EDID data
0.700, 0.300 (1.000 Vp-p)
Separate Syncs, Composite Sync, Sync on Green
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(21) Maximum Horizontal Image Size = 380 mm
(22) Maximum Vertical Image Size = 300 mm
(23) Display Gamma = 2.20
(24) Power Management and Supported Feature(s):
Active Off/Very Low Power, Standard Default Color Space,
Preferred Timing Mode
Display Type = R/G/B Color
(25-34) CHROMA INFO:
Red X -0.639 Green X -0.297 Blue X -0.146 White X -0.313
Red Y -0.342 Green Y -0.615 Blue Y -0.068 White Y -0.329
(35) ESTABLISHED TIMING I:
720 X 400 @ 70Hz (IBM,VGA)
640 X 480 @ 60Hz (IBM,VGA)
640 X 480 @ 67Hz (Apple,Mac II)
640 X 480 @ 72Hz (VESA)
640 X 480 @ 75Hz (VESA)
800 X 600 @ 56Hz (VESA)
800 X 600 @ 60Hz (VESA)
(36) ESTABLISHED TIMING II:
800 X 600 @ 72Hz (VESA)
800 X 600 @ 75Hz (VESA)
832 X 624 @ 75Hz (Apple,Mac II)
1024 X 768 @ 60Hz (VESA)
1024 X 768 @ 70Hz (VESA)
1024 X 768 @ 75Hz (VESA)
1280 X 1024 @ 75Hz (VESA)
(37) Manufacturer's Reserved Timing:
1152 X 870 @ 75Hz (Apple,Mac II)
(38-53) Standard Timing Identification:
1280 X 1024 @60Hz
1152 X 864 @75Hz
1024 X 768 @85Hz
800 X 600 @85Hz
640 X 480 @85Hz
Not Used
Not Used
Not Used
(54-71) Detailed Timing / Descriptor Block 1:
1280x1024 Pixel Clock: 108.00 MHz
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Horizontal Image Size: 376 mm Vertical Image Size: 301 mm
Refreshed Mode: Non-Interlaced Normal Display -No Stereo
Horizontal:
Active Time: 1280 pixels Blanking Time: 408 pixels
Sync Offset: 48 pixels Sync Pulse Width: 112 pixels
Border: 0 pixels Frequency: 63.98 KHz
Vertical:
Active Time: 1024 lines Blanking Time: 42 lines
Sync Offset: 1 lines Sync Pulse Width: 3 lines
Border: 0 lines Frequency: 60.02 Hz
Digital Separate, Horizontal Polarity (+) Vertical Polarity (+)
(72-89) Detailed Timing / Descriptor Block 2:
Monitor Serial Number:
P1T030100001
(90-107) Detailed Timing / Descriptor Block 3:
Monitor Range Limits:
Max Vertical Freq -85 Hz
Min Horiz. Freq -30 KHz
Secondary GTF -Not Supported
(108-125) Detailed Timing / Descriptor Block 4:
Monitor Name:
VX910
(126) No Extension EDID Block(s)
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
(127) CheckSum OK
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Appendix F: Digital EDID
Time: 16:45:03
Date: Mon Dec 01, 2003
______________________________________________________________________
______________________________________________________________________
VIEWSONIC CORPORATION
EDID Version # 1, Revision # 3
DDCTest For: ViewSonic VX910
______________________________________________________________________
______________________________________________________________________
128 BYTES OF EDID CODE:
0 1 2 3 4 5 6 7 8 9
________________________________________
0 | 00 FF FF FF FF FF FF 00 5A 63
10 | 19 3C 01 01 01 01 01 0D 01 03
20 | 80 26 1E 78 2E A2 65 A3 57 4C
30 | 9D 25 11 50 54 BF EF 80 81 80
40 | 71 4F 61 59 45 59 31 59 31 0A
50 | 01 01 01 01 30 2A 00 98 51 00
60 | 2A 40 30 70 13 00 78 2D 11 00
70 | 00 1E 00 00 00 FF 00 50 31 54
80 | 30 33 30 31 30 30 30 30 31 0A
90 | 00 00 00 FD 00 32 55 1E 52 0E
100 | 00 0A 20 20 20 20 20 20 00 00
110 | 00 FC 00 56 58 39 31 30 0A 20
120 | 20 20 20 20 20 20 00 DF
(08-09) ID Manufacturer Name = VSC
(11-10) Product ID Code = 3C19
(12-15) Last 5 Digits of Serial Number = Not Used
(16) Week of Manufacture = 01
______________________________________________________________________
(17) Year of Manufacture = 2003
(10-17) Complete Serial Number = See Descriptor Block
(18) EDID Version Number = 1
(19) EDID Revision Number = 3
(20) VIDEO INPUT DEFINITION:
Digital Signal
Non -VESA DFP 1.x Compatible
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(21) Maximum Horizontal Image Size = 380 mm
(22) Maximum Vertical Image Size = 300 mm
(23) Display Gamma = 2.20
(24) Power Management and Supported Feature(s):
Active Off/Very Low Power, Standard Default Color Space,
Preferred Timing Mode
Display Type = R/G/B Color
(25-34) CHROMA INFO:
Red X -0.639 Green X -0.297 Blue X -0.146 White X -0.313
Red Y -0.342 Green Y -0.615 Blue Y -0.068 White Y -0.329
(35) ESTABLISHED TIMING I:
720 X 400 @ 70Hz (IBM,VGA)
640 X 480 @ 60Hz (IBM,VGA)
640 X 480 @ 67Hz (Apple,Mac II)
640 X 480 @ 72Hz (VESA)
640 X 480 @ 75Hz (VESA)
800 X 600 @ 56Hz (VESA)
800 X 600 @ 60Hz (VESA)
(36) ESTABLISHED TIMING II:
800 X 600 @ 72Hz (VESA)
800 X 600 @ 75Hz (VESA)
832 X 624 @ 75Hz (Apple,Mac II)
1024 X 768 @ 60Hz (VESA)
1024 X 768 @ 70Hz (VESA)
1024 X 768 @ 75Hz (VESA)
1280 X 1024 @ 75Hz (VESA)
(37) Manufacturer's Reserved Timing:
1152 X 870 @ 75Hz (Apple,Mac II)
(38-53) Standard Timing Identification:
1280 X 1024 @60Hz
1152 X 864 @75Hz
1024 X 768 @85Hz
800 X 600 @85Hz
640 X 480 @85Hz
640 X 400 @70Hz
Not Used
Not Used
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