ViewSonic VE710, VA721, VS10047 Schematic

Service Manual
ViewSonic
Model No. VS10047
17Color TFT LCD Display
VE710s/b-21
VA721
ViewSonic
381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
Copyright
Copyright 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.
2004 by ViewSonic Corporation. All rights reserved. No part of this publication may be
¤
Revision History
Revision Date Description Of Changes Approval
1a 03/11/04 Initial Release DCN-3765 Angela Luh
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TABLE OF CONTENTS
1. Precautions and Safety Notices
2. Specification
3. Front Panel Function Control Description
4. Circuit Description
5. Adjusting Procedure
6. Trouble Shooting Flow Chart
7. Recommended Spare Parts List
8. Exploded Diagram And Spare Parts List
9. Block Diagram
10. Schematic Diagrams
11. PCB Layout Diagrams
1
2 4
10
14
16 18
33 36 37
44
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1. Precautions and Safety Notices
1.1. SAFETY PRECAUTIONS
This monitor is manufactured and tested on a ground principle that a user's safety comes first. However, improper use or installation may cause damage to the monitor as well as to the user. Carefully go over the following WARNINGS before installing and keep this guide handy.
WARNINGS:
.This monitor should be operated only at the correct power sources indicated on the label on the rear end of the monitor. If you're unsure of the power supply in your residence, consult your local dealer or power company.
• Do not try to repair the monitor your self as it contains no user-serviceable parts. This monitor should only be repaired by a qualified technician.
• Do not remove the monitor cabinet. There is high-voltage parts inside that may cause electric shock to human bodies, even when the power cord is unplugged.
• Stop using the monitor if the cabinet is damaged. Have it checked by a service technician.
• Put your monitor only in a clean, dry environment. If it gets wet, unplug the power cable immediately and consult your service technician.
• Always unplug the monitor before cleaning it. Clean the cabinet with a soft, dry cloth. Apply non-ammonia based cleaner onto the cloth, not directly onto the glass screen.
• Keep the monitor away from magn etic objects, motors, TV sets, and transformer.
• Do not place heavy objects on the monitor or power cord.
1.2. PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety visual inspections and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltages, wattage, etc. Before replacing any of these components read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as sp ecified in the parts list may create shock, fire, or other hazards.
1.3. SERVICE NOTES
1. When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.
2. When replacing a high wattage resistor (more than 1W of metal oxide film resistor) in circuit board, keep the resistor about 5mm away from circuit board.
3. Keep wires away from high voltage, high temperature components and sharp edges.
4. Keep wires in their original position so as to reduce interference.
5. Please refer to user's manual for additional instructions on using this product.
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2. Specification
2.1. PRODUCT SPECIFICATIONS
LCD Panel 17.0" TFT
Power Management Energy Star compliant VESA DPMS compatible < 1W
Displayable Resolution SXGA 1280× 1024 (max.) Pixel Dimension 0.264(H)× 0.264(V)mm
LCD Display Color 16.2 m Color (6+2 Bits) Viewing Angle CR≧10 Horizontal: 140 deg Vertical: 130 deg
Contrast Ratio 450 : 1 (typ.) 360:1 (min.)
2
Brightness 240 cd/ m
300 cd/m2 (typ.)
(min.)
Response Time Tr: 9 ms Tf: 16 ms (typ.)
Tr: 18 ms Tf: 32 ms (max.)
Active Display Area 337.9mm(H)× 270.3mm(V)
Temperature Operating: 0°C ~ +40°C
Storage: -20°C ~ +60°C
Compliance UL, CUL, TÜV, CE, FCC, VCCI, BSMI,CCC, Energy Star, Energy, TCO'99,
PSB, PCBC, NOM, C-TICK, Gost-R / Hygienic
Power Input Voltage: 100~240 Vac
Consumption: 35 Watts (Max.)
2.2. FACTORY SUPPORTING MODES
Primary Preset: VESA 1280 x 1024 @ 60Hz
Look up table timing: 1. 640 x 350 @ 70Hz, 31.5kHz
2. 640 x 480 @ 60Hz, 31.5kHz
3. 640 x 480 @ 67Hz, 35.0kHz
4. 640 x 480 @ 75Hz, 37.5kHz
5. 640 x 480 @ 72Hz, 37.9kHz
6. 640 x 480 @ 85Hz, 43.27kHz
7. 720 x 400 @ 70Hz, 31.5kHz
8. 800 x 600 @ 56Hz, 35.1kHz
9. 800 x 600 @ 60Hz, 37.9kHz
10. 800 x 600 @ 75Hz, 46.9k Hz
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11. 800 x 600 @ 72Hz, 48.1kHz
12. 800 x 600 @ 85Hz, 53.7kHz
13. 832 x 624 @ 75Hz, 49.7kHz
14. 1024 x 768 @ 60Hz, 48.4kHz
15. 1024 x 768 @ 70Hz, 56.5kHz
16. 1024 x 768 @ 72Hz, 58.1kHz
17. 1024 x 768 @ 75Hz, 60.0kHz
18. 1024 x 768 @ 85Hz, 68.67kHz
19. 1280 x 1024 @ 60Hz, 63.4kHz
20. 1280 x 1024 @ 75Hz, 79.97kHz
21. 1280x720 @ 60Hz, 45kHz
2.3. D-SUB CONNECTOR
D-SUB 15 PIN CONNECTOR
1.R 6.GND 11.NC
12345
678910
11 12 13 14 15
SIGNAL LEVEL
CONNECTOR SIGNAL DESCRIPTION
R RED 0.7vp-p(VIDEO)
2.G 7.GND 12.SDA
3.B 8.GND 13.H.SYNC
4.NC 9. +5V 14.V.SYNC
5.GND 10.GND 15.SCL
G GREEN 0.7vp-p(VIDEO) B BLUE 0.7vp-p(VIDEO) H H/SYNC TTL positive or negative V V/SYNC TTL positive or negative
SDA DDC1/2B TTL
SCL DDC1/2B TTL
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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.
Also toggles between two controls on some screens.
Also a shortcut to Auto Image Adjust.
Displays the Main Menu or exits the control screen and saves adjustments.
Power light Green = ON Orange = Power Saving
Power On/Off
Scrolls through menu options and adjusts the displayed control.
Also a shortcut to display the Contrast adjustment control screen.
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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
?
1:EXIT 2:SELECT
Auto Adjust
Contrast/Brightness
Color Adjust
Information
i
Image Adjust
Setup Menu
Memory Recall
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
1:EXIT 2: Brightness
4
To adjust the control, press the upIor downJbuttons.
5
To save the adjustments and exit the menu, press button [1] twice.
Thefollowing tips may help you optimizeyour display:
The line at the bottom of the screen tells you what you can do next: Exit or Select the control that is highlighted.
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 Iand down Jbuttons.
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
Color Adjust
adjusts background black level of the screen image.
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.
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Information
coming from the graphics card in your computer. See your
displays the timing mode (video signal input)
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
NOTE:
(Horizontal Size) adjusts the width of the screen image.
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
Setup Menu displays the menu shown below.
adjusts the clarity and focus of the screen image.
The Setup Menu controls are explained below.
L
anguage
Select allows you to choose the language used in
the menus and control screens.
OSD
Resolution Notice
OSD Position
advises the optimal resolution to use.
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.
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Control Explanation
allows you to turn the On-Screen display
OSD
OSD Background
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 [▲▲▲▲]
[▼▼] + [▲▲▲▲]
[1] + [2] toggle 720x400 and 640x400 mode when
[1] + [▼▼] + [▲▲▲▲]
(Keep pushing 5 sec)
[1] + [▼▼] [1] + [▲▲]
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.
input 720x400 or 640x400 mode. White Balance.
Power Lock OSD Lock
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4. Circuit Description
A. Scaling controller
The ADC converts RGB analog signals to digital signals that the scaling chip can acknowledge. The HSYNC input receives a logic signal and provides the frequency reference for pixel clock generation. The scaling IC converts the input signal ranging from VGA to SXGA into SXGA resolution that panel can acknowledge.
GENERAL DESC RIPTION
The MST8116A is a high performance, and fully integrated graphics processing IC solution for LCD monitors with resolutions up to SXGA. It is configured with an integrated triple-ADC/PLL, a high quality scaling engine, an on-screen display controller, a built-in output clock generator, a panel timing controller (TCON), and RSDS display interface. To further reduce system costs, the MST8116A also integrates intelligent power management control capability for green-mode requirements and spread-spectrum support for EMI management.
PIN DESCRIPTION
CPU Interface
Pin Name Pin Type Function Pin
HWRESET Schmitt Trigger Input w/ 5V-tolerant Hardware reset; active high 32 CS Input w/ 5V-tolerant 3 Wire Serial Bus Chip Select; active high 69 SDA I/O w/ 5V-tolerant 3 Wire Serial Bus Data; 4mA driving strength 70 SCL Input w/ 5V-tolerant 3 Wire Serial Bus Clock 71 INT Output CPU interrupt; 4mA driving strength 72
Analog Interface
Pin Name Pin Type Function Pin
HSYNC0 Schmitt Trigger Input w/ 5V-tolerant Analog HSYNC input 37 VSYNC0 Schmitt Trigger Input w/ 5V-tolerant Analog VSYNC input 38 REFP Internal ADC top de-coupling pin 66 REFM Internal ADC bottom de-coupling pin 67 RIN0 Analog Input Analog red input 63 RIN0M Analog Input Reference ground for analog red input 62 SOGIN0 Analog Input Sync-on-green input 61 GIN0 Analog Input Analog green input 60 GIN0M Analog Input Reference ground for analog green input 59 BIN0 Analog Input Analog blue input 58 BIN0M Analog Input Reference ground for analog blue input 57 REXT External resistor 390 ohm to AVDD 52
RSDS Interface
Pin Name Pin Type Function Pin
CLKAP Output A-Link Positive RSDS Differential Clock Output from“Odd” Channel 118
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CLKAN Output A-Link Negati ve RSD S Di fferential Clock Output from“Odd” Channel 119 CLKBP Output B-Link Positive RSDS Differential Clock Output from“Even” Channel 120 CLKBN Output B-Link Negative RSDS Differentia l Cl ock Output from“Even” Channel 121 BA[3:1]P Output A-Link Positive RSDS Differential Data Output from“Odd” Channel 92, 90, 88 BA[3:1]N Output A-Link Negative RSDS Differential Data Output from“Odd” Channel 93, 91, 89 GA[3:1]P Output A-Link Positive RSDS Differential Data Output from“Odd” Channel 102, 100, 98 GA[3:1]N Output A-Link Negative RSDS Differential Data Output from“Odd” Channel103, 101,99 RA[3:1]P Output A-Link Positive RSDS Differential Data Output from“Odd” Channel 112, 110, 108 RA[3:1]N Output A-Link Negative RSDS Differential Data Output from“Odd” Channel 113, 111, 109 BB[3:1]P Output B-Link Positive RSDS Differential Data Output from“Even” Channel 4, 128, 124 BB[3:1]N Output B-Link Negative RSDS Differential Data Output from“Even” Channel 5, 1, 125 GB[3:1]P Output B-Link Positive RSDS Differential Data Output from“Even” Channel 14, 12, 8 GB[3:1]N Output B-Link Negative RSDS Differential Data Output from“Even” Channel 15, 13, 9 RB[3:1]P Output B-Link Positive RSDS Differential Data Output from“Even” Channel 24, 22, 16 RB[3:1]N Output B-Link Negative RSDS Differential Data Output from“Even” Channel 25, 23, 17 GPO[8:5] Output TCON GPO[8: 5]; 4mA driving strength 29, 28, 30,3 1 GPO[4:0] Output w/ Pull-do wn TCO N GPO[4:0]; 4~12mA driving strength programmable 79-83 OINV Output w/ Pull-down Resistor TCON “Odd” Channel Inversion; 4~12mA driving strength programmable 78 EINV Output w/ Pull-down Resistor TCON “Even” Channel Inversion; 4~12mA driving strength programmable 77 OSP Output w/ Pull-down Resistor TCON “Odd” Channel Start Pulse; 4~12mA driving strength programmable 76 ESP Output w/ Pull-down Resistor TCON “Even” Channel Start Pulse; 4~12mA driving strength programmable 75
GPIO Interface
Pin Name Pin Type Function Pin
GOUT1/PWM1 Output GOUT1/ PWM1; 4mA driving strength 74 GOUT0/PWM0 Output GOUT0/ PWM0; 4mA driving strength 73
Misc. Interface
Pin Name Pin Type Function Pin
BYPASS For External Bypass Capacitor 3 XIN Crystal Oscillator Input Xin 33 XOUT Crystal Oscillator Output Xout 34
Power Pins
Pin Name Pin Type Function Pin
AVDD 3.3V Power ADC Power 45, 51, 55, 65 AVSS Ground ADC Ground 39, 42, 48, 56, 64, 68 AV DD_PLL 3.3V Power PLL Power 53 AVSS_PLL Ground PLL Ground 54 AVDD_MPLL 3.3V Power MPLL Power 35
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AVSS_MPLL Ground MPLL Ground 2, 36 VDDP 3.3V Power Digital Output Power 11, 21, 84, 94, 104, 114, 126 GNDP Ground Digital Output Ground 10, 20, 85, 95, 105, 115, 127 VDDC 2.5V Power Digita l Core Power 18, 87, 97, 1 17 GNDC Ground Digital Core Ground 19, 86, 96, 116
No Connects
Pin Name Pin Type Function Pin
NC No Connect. Leave These Pins Floating. 6, 7, 26, 27, 40, 41, 43, 44, 46, 47, 49, 50, 106, 107, 122, 123 Resolution 8 Bits DC ACCURACY Differential Nonlinearity ±0.5 +1.50/-1.0 LSB Integral Nonlinearity ±1 LSB No Missing Codes Guaranteed ANALOG INPUT 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 165 MSPS Minimum Conversion Rate 20 MSPS HSYNC Input Frequency 15 200 kHz PLL Clock Rate 20 162.5 MHz PLL Jitter 500 ps p-p Sampling Phase Tempco TBD ps/ C  DIGITAL IN PUTS Input Voltage, High (VIH) 2.5 V Input Vo ltage, Low (VIL) 0.8 V Input Current, High (IIH) -1.0 uA Input Current, Low (IIL) 1.0 uA Input Capacitance 5 pF DIGITAL O UTPUTS Output Voltage, High (VOH) VDDP-0.1 V Output Voltage, Low (VOL) 0.1 V DYNAMIC PERFORMANCE
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Analog Bandwidth, Full Power 250 MHz Channel to Channel Matching 0.5% Full-Scale
3.3V Supply Voltages VVDD_33 -0.3 3.6 V
2.5V Supply Voltages VVDD_25 -0.3 2.75 V Input Voltage (5V tolerant inputs) VIN5Vtol -0.3 5.0 V Input Voltage (non 5V tolerant inputs) VIN -0.3 VVDD_33 V
B. MTV312M64
The MTV312M micro-controller is an 8051 CPU core embedded device especially tailored for CRT/LCD Monitor applications. It includes an 8051 CPU core, 1024-byte SRAM, 14 built-in PWM DACs, VESA DDC interface, 4-channel A/D converter, and a 64K-byte internal program Flash-ROM. 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. A “open drain pin” means it can sink at least 4mA current but only drive 10~20uA to VDD. It can be used as input or output function and needs an external pull up resistor. A “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 100uA 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.
POWER CONFIGURATION
The MTV312M can work on 5V or 3.3V power supply system. In 5V power system, the VDD pin is connected to 5V power and the VDD3 needs an external capacitor, all output pins can swing from 0~5V, input pins can accept 0~5V input range. And ADC conversion range is 5V. However, X1 and X2 pins must be kept below 3.3V. In 3.3V power system, the VDD and VDD3 are connected to 3.3V power, all output pins swing from 0~3.3V, HSYNC, VSYNC and open drain pin can accept 0~5V input range, other pins must be kept below 3.3V. And the ADC conversion range is 3.3V.
C. INVERTER
In order to drive the CCFLs embedded in the panel module, there is a half bridge inverter to convert the input 12V up to several hundred volts AC. The inverter is formed by symmetric stages 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,
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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