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Service Manual
ViewSonic VX9241
Model No. VS10162
19" Color TFT LCD Display
(VX912_SM. 1a May 2005)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
Copyright
Copyright 2005 by ViewSonic Corporation. All rights reserved. No part of this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or
computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual or otherwise, without the prior written permission of ViewSonic Corporation.
Disclaimer
ViewSonic makes no representations or warranties, either expressed or implied, with respect to the
contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular
purpose. Further, ViewSonic reserves the right to revise this publication and to make changes from time
to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or
changes.
Trademarks
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.
Revision History
Revision SM Editing Date ECR Number Description of Changes Editor
1a 05/09/05 Initial Release A. Lu
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TABLE OF CONTENTS
1. Precautions and Safety Notices 1
2. Specification 5
3. Front Panel Function Control Description 11
4. Circuit Description 17
5. Adjustment Procedure 27
6. Troubleshooting Flow Chart 49
7. Recommended Spare Parts List 55
8. Exploded Diagram and Spare Parts List 58
9. Block Diagram 68
10. Schematic Diagrams 70
11. PCB Layout Diagrams 78
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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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Correct methods : Incorrect Methods :
Only touch the metal frame of the panel or the front If the surface of the panel is pressed by fingers, this
cover of the monitor. may cause "MURA."
Do not touch the surface of the polarizer .
Take out the monitor by grasping the cushion. If the monitor is removed by grasping the LCD
panel, that may cause "MURA."
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Correct Methods : Incorrect Methods :
Place the monitor on a clean & soft foam pad . If the monitor is placed on foreign objects,
that could scratch the surface of the panel.
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2. Specification
GENERAL specification
Test Resolution & Frequency 1280x1024 @ 60Hz
Test Image Size Full Size
Factory Default:
Contrast and Brightness Controls
Contrast = 70%, Brightness = 100%
VIDEO INTERFACE
Analog Input Connector DB-15 (Analog), refer the appendix A
Digital Input Connector DVI-I (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 1/2B
1. Video RGB (Analog)
Video Signals Separate, Composite, and Sync on Green
2. TMDS (Digital)
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 LVDS
DDC 1/2B Compliant with Revision 1.3
Sync Compatibility Separate Sync, Composite Sync, SOG
Shall be compatible with all PC type computers,
Video Compatibility
Macintosh computers, and after market video cards
640 x 350*, 640 x 480, 720 x 400* (640 x 400*), 800 x
600, 832 x 624, 1024 x 768, 1152 x 864, 1152 x 870,
1280 x 720, 1280 x 960, 1280 x 1024
Resolution Compatibility
* The image vertical size might not be full screen.
But the image vertical position should be at the center.
Exclusions Not compatible with interlaced video
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POWER SUPPLY
Internal Power Supply Part Number: FSP035-1PI01
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 3.5 A typical at 12.0 VDC ( Protect when short circuit )
Leakage Current 0.75mA (Max) at 264VAC / 50Hz
EFFICIENCY 77 % typical at 115VAC Full Load
Fuse Internal and not user replaceable
Power Dissipation 35 Watts (typ)
Max Input AC Current 1.2 Arms @ 90VAC, 0.7 Arms @265VAC
INRUSH CURRENT (COLD START) 60 A @ 115VAC
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 2000V 200 ampere ring wave transient test with no
damage
Shall be able to withstand 1.5 times nominal line voltage
Power Supply Line Surge Immunity
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
Power Supply Acoustics to 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
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Separate 3-prong type plug.
CCC Type Power Cable Length = 1.8m. Connects to display.
Color = Black
Separate 2-prong NEMA 1-15P type plug. Length =
PSE Type Power Cable 1.8m. Connects to display.
Color = Black
VESA DPMS Signaling
Power Saving Operation(Method)
ON Mode < 40 W (Max) / 35 W (Typ)
On Mode < 40 W (Max) / 35 W (Typ)
Power Consumption
Saving Mode < 2 W, Off Mode < 1 W
Recovery Time On Mode = N/A, Active Off < 3 sec
ELECTRICAL REQUIREMENT
Horizontal / Vertical Frequency
Horizontal Frequency 30 82 KHZ
Vertical Refresh Rate 50 75 HZ
Maximum Pixel Clock 135 MHz
Sync Polarity Independent of sync polarity.
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 No
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 No No
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 No No
16 832 x 624 @ 75Hz, 49.7kHz Yes Yes
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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 No No
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 : 3 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"
- The monitor needs to do "Auto Adjust" the first time when a new mode is detected
(See section "0-TouchTM Function Actions")
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TFT LCD PANEL
1st Source Panel
Model number AUO M190EN04 V5
Type TN type with LVDS interface
Active Size 376.32 (H) x 301.06 (V)
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.294 mm
GLASS TREATMENT Anti Glare (Hard coating 3H)
# OF BACKLIGHTS 4 CCFL edge-light (2 top / 2 bottom)
BACKLIGHT LIFE 50,000 Hours (Min)
Luminance (5-point) 275 cd/m2 (Typ after 30 minute warm up)
Condition: 215 cd/m2 (Min after 30 minute warm up)
CT = 6500K, Contrast = Max, Brightness = Max
Brightness Uniformity 70% Entire Area (min)
Contrast Ratio 550:1 (typ), 350:1 (min)
Color Depth 16.2 million colors (6 bits + 2 bits FRC)
Viewing Angle (Horizontal) @ CR>10
Typical: 140º
Minimum: 130º
Viewing Angle (Vertical) @ CR>10
Typical: 135º
Minimum: 125º
Total = 4.8ms (black white)
Response Time (Tr=3.4ms, Tf=1.4ms)
10%-90% @ Ta=25°C
Total = 4.0ms (gray gray)
Panel Defects Please see Panel Quality Specifications.
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MECHANICAL
Dimension (Desktop)
Width 431 mm (17 inch)
Height 468 mm (18.4 inch)
Depth 201 mm (7.9 inch)
Monitor Weight 6.7 Kg (14.8 lbs)
Dimension (Head Only / Wall Mount)
Width 431 mm (17 inch)
Height 370 mm (14.6 inch)
Depth 66 mm (2.6 inch)
Monitor Weight 5.3 Kg (11.7 lbs)
Ergonomics
Tilt Up From 0º up to 20º
Tilt Down From 0º down to -3º ~ -5 º
ENVIRONMENTAL
- Operating Temperature : 0°C to +40°C
- Storage Temperature : -20°C to +60°C
- Operating Relative Humidity : 20% to 90% RH Non-Condensing
- Storage Relative Humidity : 5% to 90% RH Non-Condensing
- Operating Altitude : 0 to +3,000 meters
- Storage Altitude : 0 to +12,000 meters
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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 OSD controls which display
on the screen. The OSD controls are explained at the top of the next page and are defined in
"Main Menu Controls" on page 13.
Main Menu
with OSD controls
Front Control Panel
shown below in detail
Scrolls through menu options and adjusts the
displayed control.
Also a shortcut to display the Contrast adjustment
control screen.
Displays the Main Displays the control screen for the
Menu or exits the highlighted control.
control screen Also toggles between two controls on
and saves some screens.
adjustments. Also a shortcut to toggle analog and
digital connection.
Power light
Green = ON
Orange = Power Saving
Power On/Off
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Do the following to adjust the display setting:
1. To display the Main Menu, press button [1].
NOTE: All OSD menus and adjustment screens disappear automatically after about 30
seconds. This is adjustable through the OSD timeout setting in the setup menu.
2. To select a setting to be adjusted, press or to scroll up or down the Main Menu.
3. After the desired control is selected, press button [2]. A control screen like the one shown
below appears.
The line at the bottom of the screen tells
you what you can do next: Exit or select the
Brightness control.
4. To adjust the setting, 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 graphics card so that it outputs a 1280 x 1024 @ 60Hz video signal
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 automatically sizes, centers, and fine tunes the video signal
to eliminate waviness and distortion.
NOTE:
1. Auto Image Adjust works with most common video cards. 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 pre-set value.
2. The Auto Image Adjust and most Manual Image Adjust functions are not
available for DVI input.
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.
Color Adjust provides several color adjustment modes: preset color
temperatures and User Color which allows you to adjust red (R), green (G), and
blue (B) separately. The factory setting for this product is 6500K (6500 Kelvin).
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.
9300K-Adds blue to the screen image for cooler white (used in most office
settings with fluorescent lighting).
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Control Explanation
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).
1. To select color (R, G or B) press button [2].
2. To adjust selected color, press or .
Important: If you select RECALL from the Main Menu when the product is set
to a Preset Timing Mode, colors return to the 6500K factory preset.
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 graphics 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 displays the Manual Image Adjust menu.
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Control Explanation
The Manual Image Adjust controls are explained below:
H./V. Position (Horizontal/Vertical Position) moves the screen image left or
right and up or down.
H. Size (Horizontal Size) adjusts the width of the screen image.
Fine Tune sharpens the focus by aligning the text and/or graphic characters.
Sharpness adjusts the clarity and focus of the screen image.
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.
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Control Explanation
OSD Timeout sets the length of time the 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.
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.
Exception: This control does not affect changes made with the User Color
control, Language or Power Lock setting.
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4. Circuit Description
1. Outline
1.1 Buttons on the front panel: Power On/Off button, button 2 (ENTER / INPUT SELECT), up arrow
button, down arrow button, button 1 (MENU).
1.2 The D-sub 15-pin connector, DVI-I connector and AC-IN jack are located on the back side of the cabinet.
1.3 The OSD menu includes the following functions:
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 the UP / DOWN buttons.
2. Connectors
2.1 AC Socket: CEE22 type connector
2.2 Video signal connector for analog input: 15P Mini D-Sub
CN6
10
PIN MNEMONIC SIGNAL
1
6
2
7
3
8
4
9
5
DB15HD
1 RV Red Video
16 17
2 GV Green Video
3 BV Blue Video
11
12
13
14
15
4 NC None
5 GND Ground(DDC return)
6 RG Red GND
7 GG Green GND
8 BG 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
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2.3 Video signal connector for digital input: 24pin DVI-D connector
CN9
Pin No. Signal Name Description
1 RX2- TMDS negative differential input, channel 2
1
RX2- 2 2 RX2+ TMDS positive differential input, channel 2
RX2+ 3
GND 4
RX4- 3 GND Logic Ground
5
RX4+ 6
SCL 4 RX4- Reserved. No connection
7
SDA 8
VS 5 RX4+ Reserved. No connection
9
RX1- 10 6 SCL DDC2B Clock
RX1+ 11
GND 12 7 SDA DDC2B Data
RX3- 13
RX3+
5V
14 8 VS Reserved. No connection
15
GND 16
HP 9 RX1- TMDS negative differential input, channel 1
17 10 RX1+ TMDS positive differential input, channel 1
RX0- 18
RX0+ 19
GND 20 11 GND Logic Ground
RX5- 21
RX5+ 22 12 RX3- Reserved. No connection
GND 23
RXC+ 24 13 RX3+ Reserved. No connection
RXC-
14 +5V Power
15 GND Logic Ground
16 HP SENSE Pin, Pull High
17 RX0- TMDS negative differential input, channel 0
DVI-D 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
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 ¢X
C
Input AC
Warming up > 30 min
Display 1280 x 1024
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3.2 Power
3.2.1 Power supply
Input voltage 100~240Vac
Power frequency 50~60Hz
Input current <1.5A RMS @90V AC
Inrush current <0.8A RMS @180V AC
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
This LCD display can automatically detect and display input signals whose timing falls within the
following limits.
Horizontal: Sync frequency: 30~82 kHz
Vertical: Sync frequency: 56~75Hz
3.4 Signal level and input impedance
3.4.1 Video signal level: 0.7Vp-p
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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5. EDID data
AUO Analog EDID
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 | 1C 0F 01 01 01 01 01 0F 01 03
20 | 0E 26 1E 78 2E 68 75 A2 5A 49
30 | 9F 23 13 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 53 33
80 | 30 35 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 32 34 0A 20
120 | 20 20 20 20 20 20 00 D3
__________ _______________________________________
(08-09) ID Manufacturer Name = VSC
(11-10) P roduct ID Code = 0F1C
(12-15) Last 5 Digits of Serial Number = Not Used
(16) Week of Manufacture = 01
(17) Year of Manufacture = 2005
(10-17) Complete Serial Number = See Descriptor Block
(18) EDID Version Number =1
(19) EDID Revision Number =3
(20) VIDEO INPUT DEFINITION:
Analog Signal
0.700, 0.300 (1.000 Vp-p)
Separate Syncs, Composite Sync, Sync on Green
(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 - 0.634 Green X - 0.287 Blue X - 0.138 White X - 0.313
Red Y - 0.354 Green Y - 0.621 Blue Y - 0.077 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)
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(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
______________________________________________________________________
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:
PS3050100001
______________________________________________________________________
(90-107) Detailed Timing / Descriptor Block 3:
Monitor Range Limits:
Min Vertical Freq - 50 Hz
Max Vertical Freq - 85 Hz
Min Horiz. Freq - 30 KHz
Max Horiz. Freq - 82 KHz
Pixel Clock - 140 MHz
Secondary GTF - Not Supported
______________________________________________________________________
(108-125) Detailed Timing / Descriptor Block 4:
Monitor Name: VX924
(126) No Extension EDID Block(s)
(127) CheckSum OK
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Digital EDID
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 | 1C 0F 01 01 01 01 01 0F 01 03
20 | 80 26 1E 78 2E 68 75 A2 5A 49
30 | 9F 23 13 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 53 33
80 | 30 35 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 32 34 0A 20
120 | 20 20 20 20 20 20 00 28
_________________________________________________
(08-09) ID Manufacturer Name = VSC
(11-10) Product ID Code = 0F1C
(12-15) Last 5 Digits of Serial Number = Not Used
(16) Week of Manufacture = 01
(17) Year of Manufacture = 2005
(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
(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 - 0.634 Green X - 0.287 Blue X - 0.138 White X - 0.313
Red Y - 0.354 Green Y - 0.621 Blue Y - 0.077 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)
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(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
______________________________________________________________________
(54-71) Detailed Timing / Descriptor Block 1:
1280x1024 Pixel Clock: 108.00 MHz
______________________________________________________________________
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:
PS3050100001
______________________________________________________________________
(90-107) Detailed Timing / Descriptor Block 3:
Monitor Range Limits:
Min Vertical Freq - 50 Hz
Max Vertical Freq - 85 Hz
Min Horiz. Freq - 30 KHz
Max Horiz. Freq - 82 KHz
Pixel Clock - 140 MHz
Secondary GTF - Not Supported
______________________________________________________________________
(108-125) Detailed Timing / Descriptor Block 4:
Monitor Name: VX924
(126) No Extension EDID Block(s)
(127) CheckSum OK
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6. THEORY OF OPERATION
This section describes the function of the LCD monitor per functional block.
This monitor includes MB board, power board and button board.
6.1 MB BOARD
The MB board is a two-layer, single-grounded design with ground and internal planes provided. DC power from
the power board enters the board through a 6P connector. The other connector on the board is for the button board.
The VGA cable is a signal cable that carries the video, sync and DDC signals from the PC VGA adapter. This
system board consists of 4 functional areas: flat panel controller, MCU with flash ROM, and power regulators.
6.1.1 Flat panel controller: RTD2523(U7)
The heart of the system board is the Realtek RTD2523. The RTD2523 is a graphics processing IC
designed for LCD monitors. It provides all key IC functions required for LCD displays. On-chip
functions include a high-speed triple-ADC, PLL, high scaling engine and OSD controller.
a) Clock Generation:
Crystal Input Clock (TCLK and XTAL). This is the input pair to an internal crystal oscillator and
corresponding logic. A 24.576 MHz crystal is recommended.
b) Analog to Digital Converter:
The RTD2523 chip has three ADCs (analog-to-digital converters), one for each color (red, green and blue).
The analog RGB signals are connected to RTD2523 as described below.
Pin Name Pin Number
Red + 37
Red - 38
Green + 34
Green - 35
Blue + 30
Blue - 31
c) OSD: The RTD2523 has a fully programmable, high-quality OSD controller. The on-chip static
RAM (4096 words by 24 bits) stores the cell map and the cell definitions.
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d) MTV312 Micro Controller: The MTV312 micro controller (MCU) serves as the system micro controller.
It programs the RTD2523 and manages other devices in the system such as the keypad, the backlight, the
LED, the audio system and the non-volatile RAM using general purpose input/output (GPIO) pins.
Pin number Pin Name Pin Usage
1 P5.2 Key / Power on, off
13 P3.4 NV_RAM (U4) SDA
14 P3.5 NV_RAM (U4) SCL
41 P5.4 Key_down
40 P5.5 Key_right
42 P5.3 Key_up
34 P5.6 Key_left
9 P6.3 Key_mute
2 P5.1 Key_select
27 P6.0 LED_red
26 P6.1 LED_green
16 P6.2 LCD panel power1 on / off control
17 P1.0 Backlight on / off control
e) Panel Power Sequencing (PANEL_PW12,3) (Pin 16, 18): The MTV312 has two dedicated outputs
VDDCTRL1 and 2 ( Pin32 and Pin3) to control LCD power sequencing once data and control signals
are stable.
f) Panel interface (Pin73~94): The RTD2523 driver interface is highly programmable. It supports dual bus /
dual port for SXGA drivers.
6.1.2 Power Regulator AIC1563 (U2), AIC1117CY (U1,U3): The AIC1563 is a monolithic control IC
containing the primary functions required for DC to DC converters. The device consists of an internal temperature
compensated reference, a comparator, and a controlled duty cycle oscillator with an active current
sense circuit. The desired output voltage is determined by the equation, Volt = 1.25 (1 + R11 / R12).
In this case, the output voltage is 5 Volts. The AIC1563 is a low dropout positive adjustable
regulator with minimum of 1A output current capability, so it is well suited to serve as a 3.3 V or
2.5 V regulator.
6.1.3 Power Regulator AIC1117CY (U1,U3): The AIC1117CY is a monolithic control IC containing the
primary functions required for DC to DC converters. The device consists of an internal temperature
compensated reference, a comparator, and a controlled duty cycle oscillator with an active current
sense circuit. The desired output voltage is determined by the equation, Volt = 1.25 (1 + R17 / R15).
In this case, the output voltage is 2.5 Volts for panel power.
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6.2 Power (Inverter) Board
This is a specific power (inverter) board for VX912 monitor with output of 40W / 12V / 3.5A. It provides
12 VDC to drive the four cold cathode fluorescence tubes in the backlight.
6.2.1 The inverter's electrical specification is described below.
Input Rated Input Voltage 12Vdc
Input Voltage Range 11.4 ~ 12.6 Vdc
Input Current <2A
On / Off control Voltage 2~3.3 for on, 0~1 for off
Output Rated Output Strike-on Voltage 1500Vrms
Rated Output Voltage 710Vrms at 7mA
Rate Output Frequency 40~50KHz
Rated Output Current 7~8 mA
6.2.2 Power
This is a general purpose AC / DC adapter which converts 90~240 Vac to a stabilized DC voltage: 12
Volts, with a rated output current of 4.16A. The electrical specification is described below.
Rated Input Voltage 90~240 Vac, 50 / 60Hz
Operation Input Voltage 90~260 Vac, 47 ~ 63Hz
Input Current <1.5A
Inrush Current <100A@120Vac
Standby Input Voltage 12Vdc
Output Voltage Regulation +/-5%
Output Ripple & Noise 120mVp-p
Rate Output Current <3.5A
Turn-on delay <3secs
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5. Adjustment Procedure
OSD Function Menu
A. When in Analog Input Mode
1. Main Menu
Press the [1] (Menu) button to enter the Main Menu:
Press the [] button to highlight the previous item or the [] button to highlight
the next item.
Press the [1] (Menu) button to exit the Main Menu.
(1) Auto Image Adjust Page:
Press the [2] button to execute the auto image adjust function.
Press the [1] button to exit the page.
(2) Contrast/Brightness Page:
Press the [2] button to enter the contrast adjustment page.
Press the [1] button to exit the page.
1) Contrast Item
Press the [] button to increase the contrast.
Press the [] button to decrease the contrast.
Press the [2] button to enter the brightness adjustment page.
Press the [1] button to exit the page.
2) Brightness Item
Press the [] button to increase the brightness.
Press the [] button to decrease the brightness.
Press the [2] button to enter the contrast adjustment page.
Press the [1] button to exit the page.
(3) Input Select Page:
Press the [2] button to switch to digital input mode.
(4) Color Adjust Page:
Press the [2] button to enter the color adjustment page.
Press the [1] button to exit the page.
Press the [] button to highlight the previous item or the [] button to
highlight the next item.
1) sRGB Item
2) 9300K Item
3) 6500K Item
4) 5400K Item
Press the [2] button to select the currently highlighted item.
Press the [1] button to exit the currently highlighted item.
5) User Color Item
Press the [2] button to enter the user color page.
Press the [1] button to exit the page.
Red, Green, Blue Options:
Press the [2] button to cycle among the colors.
Press the [1] button to exit the page.
Press the [] button to increase the selected color level.
Press the [] button to decrease the selected color level.
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(5) Information Page:
Press the [2] button to enter the information page.
Press the [1] button to exit the information page.
(6) Manual Image Adjust Page:
Press the [2] button to enter the manual image adjustment page.
Press the [1] button to exit the page.
Press the [] button to highlight the previous item or the [] button to
highlight the next item.
1) H./V. Position Item
Press the [2] button to enter the horizontal/vertical postion adjustment page.
Press the [1] button to exit the page.
a) Horizontal Position:
Press the [2] button to enter the vertical position adjustment page.
Press the [1] button to exit the page.
Press the [] button to shift the image to the right.
Press the [] button to shift the image to the left.
b) Vertical Position:
Press the [2] button to return to the horizontal position adjustment page.
Press the [1] button to exit the page.
Press the [] button to shift the image upward.
Press the [] button to shift the image downward.
2) Horizontal Size Item
Press the [2] button to enter the horizontal size adjustment page.
Press the [1] button to exit the page.
Press the [] button to make the image wider.
Press the [] button to make the image narrower.
3) Fine tune Item
Press the [2] button to enter the fine tuning page.
Press the [1] button to exit the page.
Press "[]" Button to adjust character position in one direction.
Press "[]"Button to adjust character position in the other direction.
4) Sharpness Item
Press the [2