ViewSonic VE710, VA721, VS10047 Schematic

Service Manual

ViewSonic

Model No. VS10047

17” Color TFT LCD Display

VE710s/b-21

VA721

ViewSonic

(VE710s/b-2_VA721_SM_770 Rev. 1a Mar. 2004)



381 Brea Canyon Road, Walnut, California 91789 USA - [phone]

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.

i

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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