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Service Manual
ViewSonic VE910/b
Model No. VS10715
19" Color TFT LCD Display
(VE910_SM Rev. 1a Jun. 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 06/09/05 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 7
4. Circuit Description 13
5. Adjustment Procedure 17
6. Troubleshooting Flow Chart 34
7. Recommended Spare Parts List 37
8. Exploded Diagram and Exploded Parts List 42
9. Block Diagram 49
10. Schematic Diagrams 50
11. PCB Layout Diagrams 58
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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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5.1. Handling and Placing Methods
Correct Methods: Incorrect Methods:
Only touch the metal frame of the LCD panel Surface of the LCD panel is pressed by fingers
or the front cover of the monitor. Do not touch and that may cause"Mura"
the surface of the polarizer.
Take out the monitor with cushions Taking out the monitor by grasping the LCD
panel. That may cause"Mura"
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Place the monitor on a clean and soft foam pad. Placing the monitor on foreign objects. That
could scratch the surface of the panel or cause
"Mura"
The panel is placed facedown on the lap. That
may cause "Mura"
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2. Specification
1. General Requirements
General Specifications
Test Resolution & Frequency "1280 x 1024" @ 60Hz
Test Image Size Full Size
Contrast and Brightness Controls Factory Default:
Contrast = 70%, Brightness = 100%
2. Signal Interface
Video Interface
Analog Input Connector DB-15 (Analog)
Default Input Connector Defaults to the first detected input
Video Cable Connector DB-15 Pin out Compliant DDC 1/2B.
Video Signals 1. Video RGB (Analog) Separate Sync
Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)
Exclusions Not compatible with interlaced video.
3. Power
Power Supply
Input Voltage Range 90 to 264 VAC
Power Dissipation 40 Watts (Typ.)
4. Electrical Requirements
Horizontal / Vertical Frequency
Horizontal Frequency 30 82 KHz
Vertical Refresh Rate 50 85 Hz
* For resolution 1280 x 1024, the vertical
Refresh rate up to 75 Hz; for there rest
Resolutions, the vertical refresh rate up
To 85Hz
Maximum Pixel Clock 135 MHz
Sync Polarity Independent of sync polarity.
Timing Table
Item Timing Analog
1 640 x 350 @ 70Hz, 31.5kHz Yes
2 640 x 400 @ 60Hz, 31.5kHz Yes
3 640 x 400 @ 70Hz, 31.5kHz Yes
4 640 x 480 @ 50Hz, 24.7kHz Yes
5 640 x 480 @ 60Hz, 31.5kHz Yes
6 640 x 480 @ 67Hz, 35.0kHz Yes
7 640 x 480 @ 72Hz, 37.9kHz Yes
8 640 x 480 @ 75Hz, 37.5kHz Yes
9 640 x 480 @ 85Hz, 43.27kHz Yes
10 720 x 400 @ 70Hz, 31.5kHz Yes
11 800 x 600 @ 56Hz, 35.1kHz Yes
12 800 x 600 @ 60Hz, 37.9kHz Yes
13 800 x 600 @ 75Hz, 46.9kHz Yes
14 800 x 600 @ 72Hz, 48.1kHz Yes
15 800 x 600 @ 85Hz, 53.7kHz Yes
16 832 x 624 @ 75Hz, 49.7kHz Yes
17 1024 x 768 @ 60Hz, 48.4kHz Yes
18 1024 x 768 @ 70Hz, 56.5kHz Yes
19 1024 x 768 @ 72Hz, 58.1kHz No
20 1024 x 768 @ 75Hz, 60.0kHz Yes
21 1024 x 768 @ 85Hz, 68.67kHz Yes
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22 1152 x 864 @ 75Hz, 67.5kHz No
23 1152 x 870 @ 75Hz, 68.7kHz Yes
24 1280 x 1024 @ 60Hz, 63.4kHz Yes
25 1280 x 1024 @ 75Hz, 79.97kHz Yes
26 1280x 720 @ 60Hz, 45kHz (HDTV) Yes
Changing Modes
Maximum Mode Change Blank Time for image Under 5 seconds (Maximum)
stability. Note: 1 seconds (Typ.) for recognized timings
1) Excluding "Auto Adjust" time 1-2 seconds (Typ.) for unrecognized timing
2) Under DOS mode (640 x 350, 720 x 400 & 640 x
400), there is no "Auto Adjust" feature.
3) The monitor needs to do "Auto Adjust" the first
time a new mode is detected.
5. LCD Panel
Panel Characteristics
Panel Type M190EN04V5
Type "TFT ACTIVE MATRIX
Active Size 376.32 (H) x 301.056 (V)
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.294 mm
# of Backlights 4 CCFL edge-light (2 top / 2 bottom)
Backlight Life 50,000 Hours (minimum)
Panel Performance
Luminance 270 cd/m2 (typ. after 30-minute warm-up)
Condition: 215 cd/m2 (minimum after 30-minute warm-up)
CT = 6500K, Contrast = Max,
Brightness = Max
Brightness Uniformity L5=Max 1.3 L5= Maximum Luminance/
Minimum Luminance
Contrast Ratio 550:1 (typ.), 350:1 (minimum)
Color Depth 16.2M colors (RGB 6-bit data+FRC data)
Viewing Angle (Horizontal) 140 degrees @ CR>10
Viewing Angle (Vertical) 135 degrees @ CR>10
Response Time 8 ms (Tr= 5.6 ms, Tf = 2.4 ms) (typ.)
10%-90% @ Ta=25°C 12 ms (Tr= 8.4 ms, Tf =3.6 ms) (maximum)
6. Mechanical
Dimensions
Width 414 mm
Height 407 mm
Depth 219 mm
Monitor Weight 5.4kg / 11.88 lbs
Ergonomics
Tilt Up 20 DEGREES MINIMUM
Tilt Down -5 degrees
Package Specifications
Width 490 mm
Height 570 mm
Depth 145 mm
Gross Weight 6.8kg (14.96lb)
7. Environmental
Environmental Conditions
Operating Temperature 0°C to +40°C
Storage Temperature -20°C to +60°C
Operating Relative Humidity 10% 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
Main Menu
With OnView controls
Front Control Panel
shown below in detail
Displays the control
screen for the highlighted
control. Scrolls through menu options and
Also toggles between two adjusts the displayed control.
controls on some Power light Also a shortcut to display the
screens. Green = ON Contrast adjustment control
Also a shortcut to Auto Orange = Power Saving screen.
Image Adjust.
Displays the Main Menu Power
or exits the control screen On/Off
and saves adjustments.
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Do the following to adjust the screen image:
1 To display the Main Menu, press button [1].
Main Menu
AUTO
SET Auto Adjust
Contrast/Brightness
Color Adjust
i Information
Image Adjust
? Setup Menu
Memory Recall
1:EXIT 2:SELECT
NOTE: All OnView menus and adjustment screens disappear automatically
after about 15 seconds. This time period is adjustable through the Setup
menu and the OSD timeout control described on page 11.
2 To highlight a control you want to adjust, press I or J to scroll up or down
the Main Menu.
3 To select the highlighted control, press button [2]. A control screen appears
like the example shown below.
Contrast The line at the
bottom of the
screen tells you
1:EXIT 2: Brightness what you can do
next: Exit or Select
the control that is
highlighted.
4 To adjust the control, press the up I or down J buttons.
5 To save the adjustments and exit the menu, press button [1] twice.
The following tips may help you optimize your display:
· Adjust your computer's graphic card so that it outputs a video signal 1280 x
1024 @ 60 Hz to the LCD dislay. (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 dislay.)
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Main Menu Controls
Adjust the menu items shown below by using the up Iand down Jbuttons.
Control Explanation
Auto Adjust automatically sizes, centers, and fine tunes the
video signal to eliminate waviness and distortion.
Press the [2] button to obtain a sharper image.
NOTE: Auto Adjust works with most common video cards. If
this function does not work on your LCD dislay, then lower the
video refresh rate to 60 Hz and set the resolution to its pre-set
value.
Contrast adjusts the difference between the image background
(black level) and the foreground (white level).
Brightness adjusts background black level of the screen image.
Color Adjust provides several color options: preset color
temperatures and User which allows you to adjust red (R), green
(G), and blue (B). 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).
6500K -- Adds red to the screen image for warmer white and
richer red. Default setting.
5400K -- Adds green to the screen image for a darker color.
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Control Explanation
User -- Individual adjustments for red, green, and blue.
1 To select color (R, G or B) press button [2].
2 To adjust selected color, press I or J.
3 When you are finished making all color adjustments, press
button [1] twice.
Information displays the timing mode (video signal input)
i 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).
VESA 1280 x 1024 @ 60 Hz (recommended) means that the
resolution is 1280 x 1024 and the refresh rate is 60 Hertz.
Image Adjust
Image Adjust
H./V. Position
H. Size
Fine Tune
Sharpness
1:EXIT 2:SELECT
The Image Adjust controls are explained below:
H./V. Position adjusts horizontal and vertical position of the
screen image. You can toggle between Horizontal and Vertical
by pressing button [2]. Horizontal moves the screen image to
the left or to the right. Vertical moves the screen image up and
down.
H. Size (Horizontal Size) adjusts the width of the screen image.
NOTE: Vertical size is automatic with your LCD dislay.
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Control Explanation
Fine Tune sharpens focus by aligning the illuminated text and/
or graphic characters.
NOTE: Try the Auto Adjust (see page 9) before using the Fine
Tune control.
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 Select allows you to choose the language used in
the menus and control screens.
Resolution Notice advises the optimal resolution to use.
OSD Position allows you to move the on-screen display menus
OSD 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.
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Control Explanation
OSD Background allows you to turn the On-Screen display
OSD background on or off. This means that while making adjustments
from the OSD control screens you can also view open software
applications, or the Windows desktop.
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.
Short Cut Key
Function Key : 5 Keys ! 1 2
[1] Main Menu
[2] Auto Image Adjust
[] or [] to immediately activate Contrast menu.
It should be change to Brightness OSD
by push button [2].
[] + [] recall Contrast or Brightness while in
the Contrast or Brightness adjustment,
or recall both of Contrast and
Brightness when the OSD is not open.
[1] + [2] toggle 720x400 and 640x400 mode when
input 720x400 or 640x400 mode.
[1] + [] + [] White Balance.
(Keep pushing 5 sec)
[1] + [] Power Lock
[1] + [] OSD Lock
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4. Circuit Description
A. DC-DC Converter
This brick convert is the 110-220AC input voltage to 12V AND 5V output for invert use and
panel use and system controller use .
It consists of a PWM IC (FP5001, I804), flywheel diode (MS22,D812), buck choke (L812)
and capacitor C817.
5V Out put at 5,6 pin
VCC 12V In put at L801,L812 pin
B. Scaling controller
The ADC is to convert RGB analog signal to digital signal that scaling chip can acknowledge.
The HSYNC input receives a logic signal and provides the frequency reference for pixel clock
generation.
The scaling IC is to converts the input signal ranging from VGA to SXGA into SXGA
resolution that panel can acknowledge.
The scaling IC is to converts the input signal ranging from VGA to SXGA into SXGA
resolution that panel can acknowledge.
GENERAL DESCRIPTION
The TSU16AS is total solution graphics processing IC for LCD monitors with panel
resolutions up to SXGA. It is configured with a high-speed integrated triple-ADC/PLL, a high
quality display processing engine, and an integrated output display interface that can support
LVDS panel interface format. To further reduce system costs, the TSU16AS also integrates
intelligent power management control capability for green-mode requirements and
spread-spectrum support for EMI management.
The TSU16AS incorporates the world's first coherent oversampled RGB graphics ADC in a
monitor controller system1. The oversampling ADC samples the input RGB signals at a
frequency that is much higher than the signal source pixel rate. This can preserve details in the
video signal that ordinarily would be lost due to input signal jitter or bandwidth limitations in
non-oversampled systems.
The TSU16AS also incorporates a new Dynamic Frame Rate (DFR) generator2 for the digital
output video to the display panel that preserves the advantages of a fixed output clock rate,
while eliminating the output end of frame short-line.
1,2 Patent Pending
PIN DESCRIPTION
CPU Interface
Pin Name Pin Type Function Pin
HWRESET Schmitt Trigger Input w/
5V-tolerant
Hardware reset; active high 5
INT Output CPU interrupt; 4mA driving strength 27
AD3 I/O w/ 5V-tolerant DDR direct bus AD3; 4mA driving strength 4
AD2 I/O w/ 5V-tolerant DDR direct bus AD2; 4mA driving strength 1
AD1 I/O w/ 5V-tolerant DDR direct bus AD1; 4mA driving strength 2
AD0 I/O w/ 5V-tolerant DDR direct bus AD0; 4mA driving strength 3
ALE I w/ 5V-tolerant DDR direct bus ALE; active high 24
WRZ I w/ 5V-tolerant DDR direct bus WRZ; active low 25
RDZ I w/ 5V-tolerant DDR direct bus RDZ; active low 26
Analog Interface
Pin Name Pin Type Function Pin
HSYNC Schmitt Trigger Input w/
5V-tolerant
Analog HSYNC input 8
VSYNC Schmitt Trigger Input w/
5V-tolerant
Analog VSYNC input 9
REFP Internal ADC top de-coupling pin 22
REFM Internal ADC bottom de-coupling pin 23
RINP Analog Input Analog red input 19
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RINM Analog Input Reference ground for analog red input 18
SOGIN Analog Input Sync-on-green input 17
GINP Analog Input Analog green input 16
GINM Analog Input Reference ground for analog green input 15
BINP Analog Input Analog blue input 14
BINM Analog Input Reference ground for analog blue input 13
REXT External resistor 390 ohm to AVDD_ADC 11
LVDS Interface
Pin Name Pin Type Function Pin
LVA0M Output A-Link Negative LVDS Differential Data Output 42
LVA0P Output A-Link Positive LVDS Differential Data Output 41
LVA1M Output A-Link Negative LVDS Differential Data Output 40
TSU16AS
SXGA LCD Controller with Analog Interface and Dual LVDS Transmitter
Preliminary Data Sheet Version 0.2
Version 0.2 - 5 - 10/1/2004
Copyright c 2004 MStar Semiconductor, Inc. All rights reserved.
Pin Name Pin Type Function Pin
LVA1P Output A-Link Positive LVDS Differential Data Output 39
LVA2M Output A-Link Negative LVDS Differential Data Output 38
LVA2P Output A-Link Positive LVDS Differential Data Output 37
LVA3M Output A-Link Negative LVDS Differential Data Output 34
LVA3P Output A-Link Positive LVDS Differential Data Output 33
LVACKM Output A-Link Negative LVDS Differential Clock Output 36
LVACKP Output A-Link Positive LVDS Differential Clock Output 35
LVB0M Output B-Link Negative LVDS Differential Data Output 52
LVB0P Output B-Link Positive LVDS Differential Data Output 51
LVB1M Output B-Link Negative LVDS Differential Data Output 50
LVB1P Output B-Link Positive LVDS Differential Data Output 49
LVB2M Output B-Link Negative LVDS Differential Data Output 48
LVB2P Output B-Link Positive LVDS Differential Data Output 47
LVB3M Output B-Link Negative LVDS Differential Data Output 44
LVB3P Output B-Link Positive LVDS Differential Data Output 43
LVBCKM Output B-Link Negative LVDS Differential Clock Output 46
LVBCKP Output B-Link Positive LVDS Differential Clock Output 45
GPO Interface
Pin Name Pin Type Function Pin
PWM1 Output PWM1; 4mA driving strength 29
PWM0 Output PWM0; 4mA driving strength 28
Misc. Interface
Pin Name Pin Type Function Pin
XIN Crystal Oscillator Input Xin 6
XOUT Crystal Oscillator Output Xout 7
VCTRL Output Regulator Control 54
Power Pins
Pin Name Pin Type Function Pin
AVDD_ADC 3.3V Power ADC Power 12, 20
VDDP 3.3V Power Digital Output Power 30, 53
DDC 1.8V Power Digital Core Power 32, 55
GND Ground Ground 10, 21, 31, 56
ELECTRICAL SPECIFICATIONS
Analog Interface Characteristics
Parameter Min Typ Max Unit
Resolution 8 Bits
DC ACCURACY
Differential Nonlinearity ±0.5 +1.50/-1.0 LSB
Integral Nonlinearity ±1 LSB
No Missing Codes Guaranteed
ANALOG INPUT
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Input Voltage Range
Minimum 0.5 V p-p
Maximum 1.0 V p-p
Input Bias Current 1 uA
Input Full-Scale Matching 1.5 %FS
Brightness Level Adjustment 62 %FS
SWITCHING PERFORMANCE
Maximum Conversion Rate 220 MSPS
Minimum Conversion Rate 12 MSPS
HSYNC Input Frequency 15 200 kHz
PLL Clock Rate 12 220 MHz
PLL Jitter 500 ps p-p
Sampling Phase Tempco TBD ps/ C
DIGITAL INPUTS
Input Voltage, High (VIH) 2.5 V
Input Voltage, Low (VIL) 0.8 V
Input Current, High (IIH) -1.0 uA
Input Current, Low (IIL) 1.0 uA
Input Capacitance 5 pF
DIGITAL OUTPUTS
Output Voltage, High (VOH) VDDP-0.1 V
Output Voltage, Low (VOL) 0.1 V
DYNAMIC PERFORMANCE
Analog Bandwidth, Full Power 250 MHz
Channel to Channel Matching 0.5% Full-Scale
Specifications are subjected to change without notice.
TSU16AS
SXGA LCD Controller with Analog Interface and Dual LVDS Transmitter
Preliminary Data Sheet Version 0.2
Version 0.2 - 7 - 10/1/2004
Copyright c 2004 MStar Semiconductor, Inc. All rights reserved.
Absolute Maximum Ratings
Parameter Symbol Min Typ Max Units
3.3V Supply Voltages VVDD_33 -0.3 3.6 V
1.8V Supply Voltages VVDD_18 -0.3 1.98 V
Input Voltage (5V tolerant inputs) VIN5Vtol -0.3 5.0 V
Input Voltage (non 5V tolerant inputs) VIN -0.3 VVDD_33 V
Ambient Operating Temperature TA 0 70 °C
Storage Temperature TSTG -40 150 °C
Junction Temperature TJ 150 °C
Thermal Resistance (Junction to Air) Natural
Conversion
JA TBD °C /W
Thermal Resistance (Junction to Case) Natural
Conversion
JC TBD °C /W
Note: Stress above those listed under Absolute Maximum Rating may cause permanent
damage to those indicated in the stress rating only; functional operation of the device at
these or any other conditions outside of those indicated in the operation sections of this
specification is not implied. Exposure to absolute maximum ratings foextended periods
may affect device reliability.
ORDERING GUIDE
Model Temperature
Range
Package
Description
Package
Option
TSU16AS 0°C to +70°C SDIP
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MTV512M64
The MTV512M micro-controller is an 8051 CPU core embedded device especially tailored for
flat panel display applications. It includes an 8051 CPU core,768-byte SRAM, 4 channels of
6-bit ADC, 3 external counters/timers, 6 channels of PWMDAC, VESA DDC interface, and a
64K-byte internal program Flash-ROM memory.
FEATURES
· 8051 core, CPU operating frequency up to 24MHz
· 3.3V power supply
· 768-byte RAM; 64K-byte program Flash memory
· Maximum 6 channels of PWM DAC
· Compliant with VESA DDC1/2B/2Bi/2B+/CI
standard
· Watchdog timer with programmable interval
· Support external counters/timers, T0, T1, and ET2
· Single/double frequency clock output
· Two clock output ports
· Two external interrupts, INT1 is shared with Slave
IIC interrupt source
· Maximum 4 channels of 6-bit ADC
· Flash-ROM code protection selection
· Hardware ISP (In System Programming), no Boot
Code required
· Embedded Dual Ports DDCRAM (128-byte x 2
· Green products like Pb-Free Packages or All Green Packages available
PIN CONFIGURATION & DESCRIPTION
A "CMOS output pin" means it can sink and drive at least 4mA current. It is not
recommended to use such pin as input function.
An "open drain pin" means it can sink at least 4mA current. It can be used as input or output
function and needs an external pull up resistor.
An "8051 standard pin" is a pseudo open drain pin. It can sink at least 4mA current when
output is at low level, and drives at least 4mA current for 160nS when output transits from low
to high, then keeps driving at 120 uA to maintain the pin at high level. It can be used as input
or output function. It needs an external pull up resistor when driving heavy load device.
There is an internal pull-up resistance on each CMOS PAD and an internal pull-down
resistance on each input
Low Power Reset (LVR) & Watchdog Timer
When the voltage level of power supply is below 2.4V (+/-0.4V) for a specific period of time,
the LVR generates a chip reset signal. After the power supply is above 2.4V (+/-0.4V)
INVERTER
In order to drive the CCFLs embedded in the panel module, there is a half bridge inverter to
convert by the controller.
The input 12V up to hundreds of AC voltage output.
The inverter is formed by symmetric in order to drive the separate lamp modules.
The input stage consists of a PWM controller, half bridge inverter, and switching MOSFET to
convert DC input into AC output.
The output stage consists of a tuning capacitor, coupling capacitor, transformer, push-pull
MOSFET pair to boost AC output up to hundreds of voltage.
And one resister is serial to lamp for output voltage feedback.
There are two signal to control the inverter which come from system.
Logic "high" level which send to I901 is turn on the inverter.
BRI signal control brightness by DC level which was integral from PWM signal.
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5. Adjustment Procedure
1. Function Test
1.1. Product
- 19" LCD Monitor
1.2. Test Equipment
- Color Video Signal & Pattern (or PC with SXGA resolution and a sound card)
1.3. 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, RGB, and 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)
1.4. Test Display Modes & Pattern
1.4.1 Compatible Modes
Item Timing
1 640 x 350 @ 70Hz, 31.5kHz
2 640 x 400 @ 60Hz, 31.5kHz
3 640 x 400 @ 70Hz, 31.5kHz
4 640 x 480 @ 50Hz, 24.7kHz
5 640 x 480 @ 60Hz, 31.5kHz
6 640 x 480 @ 67Hz, 35.0kHz
7 640 x 480 @ 72Hz, 37.9kHz
8 640 x 480 @ 75Hz, 37.5kHz
9 640 x 480 @ 85Hz, 43.27kHz
10 720 x 400 @ 70Hz, 31.5kHz
11 800 x 600 @ 56Hz, 35.1kHz
12 800 x 600 @ 60Hz, 37.9kHz
13 800 x 600 @ 75Hz, 46.9kHz
14 800 x 600 @ 72Hz, 48.1kHz
15 800 x 600 @ 85Hz, 53.7kHz
16 832 x 624 @ 75Hz, 49.7kHz
17 1024 x 768 @ 60Hz, 48.4kHz
18 1024 x 768 @ 70Hz, 56.5kHz
19 1024 x 768 @ 75Hz, 60.0kHz
20 1024 x 768 @ 85Hz, 68.67kHz
21 1152 x 864 @ 75Hz, 67.5kHz
22 1152 x 870 @ 75Hz, 68.7kHz
23 1280 x 1024 @ 60Hz, 63.4kHz
24 1280 x 1024 @ 75Hz, 79.97kHz
25 1280x 720 @ 60Hz, 45kHz (HDTV)
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1.4.2 Function Test Display Pattern
Item Test Content Pattern Specification Remark
1 Frequency & Fine Line Moire Eliminate visual wavy Figure 1
Tracking noise.
2 Contrast/Brightness 16 Gray Scale 16 gray levels should be Figure 2
distinguishable.
3 Boundary Horizontal & Vertical Horizontal and Vertical Figure 3
Thickness position of video should be
adjustable to be within the
screen frame.
4 RGB Color RGB Color Contrast of each R, G, B, Figure 4,
Performance Intensities color should be normal. 5, 6
5 Screen Uniformity & Full White Should be compliant with Figure 7
Flicker the spec.
6 Dead Pixel/Line White Screen & Dark The numbers of dead Figure 7,
Screen pixels should be compliant 8
with the spec.
7 White Balance White & Black The screen must have the Figure 9
Pattern pure white and black
pattern, no other color.
Fine Line Morie Pattern (Figure1) 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)
1.5. Function Test and Alignment Procedure
1.5.1 All Modes Reset
You should do "All Mode Reset" (Refer to Chapter III-3. Hot Keys for Function
Controls) first. This action will allow you to erase all end-user's settings and restore the
factory defaults.
1.5.2 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.
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1.5.3 Firmware
Test Pattern: Burn In Mode (Refer to Chapter III-3. Hot Keys for Function Controls)
- Make sure the F/W is the latest version.
1.5.4 DDC
Test Pattern: EDID program
- Make sure it can pass test program.
1.5.5 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.
1.5.6 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.
1.5.7 White Balance
A. TIMING: 1280x1024 64KHz/60Hz.
B. PATTERN: 5 Blocks.
C. LCD MONITOR set to 1280x1024 80K/75Hz BURN IN and warm up over 30
minutes.
D. CA110 color analizer at the center of screen and along a perpendicular to the
screen at 20cm from the display.
E. Power turn off, Press "" and " 2 " and turn on power at the same time after
power LED is on, release "" and " 2 " key, Then press " 1 " key go to
factory mode. (Fig.1)
(Fig.1)
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F. Adjust Color Temperature:
(1) EEPROM INIT (5 BLOCKS):
Press "" key move cursor to EEPROM INIT, Press " 2 " key then
monitor will INIT ADC value.
(2) Press "" key move cursor to "White Balance", Press " 2 " key do
white balance adjustment.
(3) Press "" key move cursor to "Color Temperature Adjust", Press
" 2 " key, Then OSD will display Fig.2
(Fig.2)
(4) 9300K verify: move cursor to 9300K Press " 2 " key.
Press "", "" key adjust R.G.B value
x=0.283 ± 0.02
y=0.298 ± 0.02
Press " 1 " key return to Fig.2
(5) 6500K verify: Repeat (4) press "", "" move cursor to 6500K press
" 2 " key
x=0.313 ± 0.02
y=0.329 ± 0.02
(6) 5400K verify: Repeat (4) press "", "" move cursor to 5400K press
" 2 " key
x=0.332 ± 0.02
y=0.348 ± 0.02
(7) Press " 1 " key go back to Fig.2, Then press " 1 " key return to Fig.1,
Power key OFF/ON quit factory mode.
G. Color Temperature & Luminance Verify:
BRIGHTNESS MAX, CONTRAST MAX
9300K: x=0.283 ± 0.02 y=0.298 ± 0.02
6500K: x=0.313 ± 0.02 y=0.329 ± 0.02
5400K: x=0.332 ± 0.02 y=0.348 ± 0.02
1.5.8 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.
1.5.9 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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1.5.10 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.
1.5.11 Mura
Test Pattern: White, RGB, Black, & Grey
Test Tool: 8% ND Filter
- Check if the Mura can pass 8% ND Filter.
1.5.13 Check for Secondary Display Modes
Test Signal:
Analog: 640*350@70Hz; 640*480@60HZ
720*400@70Hz; 800*600@60HZ/70HZ/75HZ
832*624@75Hz, 1024*768@60HZ/70HZ/75HZ
1280*1024@60/75Hz
- Normally when the primary mode 1280*1024@60Hz is well adjusted and compliant
with the specification, the secondary display modes will be great possible to be
compliant with the spec. But we still have to check with the general test pattern to
make sure every secondary is compliant with the specification.
1.5.14 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" again.
1.5.15 Power Off Monitor
Turn off the monitor by pressing "Power" button.
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2. Firmware Upgrade Procedure
When you receive the returned monitor, please check whether the firmware version is the
latest. If not, please do the following procedures to upgrade it to the latest version.
2.1. Equipment Needed
- VE910 Monitor
- Fixture for Firmware Upgrade
- VGA Cable
- PC (Personal Computer)
- LPT Cable
- Firmware Upgrade Program
- One additional monitor for checking the program execution
Printer Port
VE910
PC
LPT Cable VGA Cable
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2.2. Setup Procedure
2.2.1 Connect P2 of Fixture with printer port of PC by LPT Cable.
2.2.2 Connect P1 of Fixture with Q190mb Monitor by VGA Cable.
2.2.4 Connect Power Cord to Q190mb Monitor.
2.2.5 Connect PC to the additional monitor.
2.3. ISP Download program procedure
2.3.1 Hardware Connect status:
2.3.2 Down load isp program
Step 1: Execute ISP.exe
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Step 2: Select MCU type
Pressing the Comb box to select the type of the MCU , It need to be selected the
MTV512MV64 for this project. Then press the Creat Security File Button to enter step 3.
Step 3: Creat Security File
Enter the three string into the blank like fig 2. Then press OK Button.
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Step 4: Load file
Press the Load MCU File button to select the file will be download. (*.hex)
Step 5: Run
Pressing the Run Button to start download program. Press OK button to Enter ISP
mode.
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Step 6: Download program finish
Pressing the OK Button to finish the download program procedure.
Trouble shooting:
If you find the status like the follow picture. Please check the following item.
a. The connecting status between PC and ISP board.
b. The connecting status between ISP status and Monitor.
Turn off the power of monitor (AC plug off ) and disconnect the D-Sub connector . To
connect the D-Sub connector and then turn on the power of monitor.(AC plug on)
If the test result shows "passed," it means the connection is well. If not (failed), it
means the connection has problems. Then you need to check the setup procedure
or reboot the PC, or simply use another PC to do the firmware upgrade.
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3. DDC Key In Procedure
Note:
1. Every time after replacing the main board, you have to do the DDC key in.
2. If you find the DDC does not conform to the monitor, you have to do the DDC key in.
3.1. Equipment Needed
- VE910 Monitor
- DDC Card
- PC
- RS232 cable
- Barcode Reader
- VGA Cable
VE910 DDC Card PC
RS-232 Cable VGA Cable Barcode Reader
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3.2. Setup Procedure
3.2.1 Connect VGA Card and DDC Card with RS-232 cable.
3.2.2 Barcode Reader connect with keyboard and PC keyboard port.
3.2.3 Connect RS-232 Cable and VE910 with VGA Cable.
(when key in DVI DDC information, use VGA transform to DVI port )
3.2.4 Connect Power Cord to VE910 Monitor.
3.3. DDC Key In Procedure
3.3.1 Run DDC.exe
3.3.2 Choose model number and conform the Time then Press "ENTER" key.
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3.3.3 When appear the PIC " choose DDC Card", Press ALT+2 Enter DDC 2B test
interface.
Choose DDC Card
3.3.4 Press F8 to choose corresponding model.DAT (VE910.DAT press "ENTER" key)
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3.3.5 Press F9 enter the download interface
3.3.6 Key in the serial number or use the barcode reader to scan the barcode of the monitor,
and press "ENTER" key.
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3.3.7 The successful picture is as follows. "Compare EDID OK! Press any key to
continue".
3.3.8 Let VE910 active then see the information in OSD, it shows "Serial NO :
PPZ0517A3178"
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3.4. Check Method
Use ViewSonic EDID Editor
Connect the VE910 to PC with VGA Cable. Excute the EDID Editor, then Press Ctrl+F5. If
the DDC is correct, you can see the information as follow:
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6. Troubleshooting Flow Chart
STAR
CHECK
MAIN BOARD
CHECK
N CHECK
I102 AND
5V OK? POWER BOARD
SUROUND CAP
OK?
OK?
Y
CHECK CHECK
3.3V N I104, SUROUND I104 3.3V
OK? CAP BEAD SUROUND CAP
OK? OK?
Y
CHECK CHECK
1.8V N I103, SUROUND I103 1.8V
OK? CAP BEAD SUROUND CAP
OK? OK?
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6.1. NO POWER
CHECK
POWER CHECK CHECK
5V O/P PANEL
STAR I902 P901~P904
T801
12V
CHECK I901
CHECK
Q905, Q911
12V O/P
Q907, Q908
C823
Q909, Q910
Y
CHECK
CHECK 5V
F801 CHECK
D823
D801 T901, T902
D822
C805
CHECK 12V MAIN
I801
BOARD
Q801
6.2. MCU NO FUNCTION
CHECK CHECK
N
RESET C123,R125,D107
CHECK N
CHECK
VCC5V L804,D823,D822
OK? OK?
N
CHECK I102 Y CHECK
PIN40 D109,D110,D112
3.3 V ?
N
CHECK 12 MHZ Y CHECK
D807,I801,I801
PIN18, X101, C126
OK? C127 OK?
N
CHECK Y CHECK TRACE
D807,I801,I801
PIN14,PIN15 RP04 RP05
CLOCK OK? OK?
N
CHECK Y CHECK
D807,I801,I801
I102,EVERY TWO PIN KEYPAD
SHORT? P103 OK?
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6.3. NO DISPLAY
Power key N Check N N Check
Check
Work ok Keypad 5VMCU