Viewsonic VA721 Service Manual

Service Manual

ViewSonic

Model No. VS10047

17” Color TFT LCD Display

VE710s/b-21

VA721

ViewSonic

(VE710s/b-2_VA721_SM_770_1b Rev.1b Nov. 2004)



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

Copyright

Copyright

2004 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.

1a

1b

DCN Number ECR Number

03/11/04

11/02

/04

Revision History

Documents Number

3765

4778

4716

Initial Release

Change Scaler from MST P/N: 2365929896
To RealTek 2023 P/N: 2365930896

Description of Changes EditorRevision SM Editing Date

A. Lu

A. Lu

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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

16

30
32

49
52
53

59

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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 SPECIFICAT ION S

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 262K Color. (6bit)
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.)

Response Time 16ms Panel Tr: 6 ms Tf: 10 ms (typ.)
16ms Panel Tr: 12 ms Tf: 20 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.
Power Input Voltage: 100~240 Vac
Consumption: 35 Watts (Max.)

2.2. FACTOR Y SUPPORTING MODES

(min.)

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

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

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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

12345

678910

11 12 13 14 15

1.R 6.GND 11.NC

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

SIGNAL LEVEL

CONNECTOR SIGNAL DESCRIPTION

R RED 0.7vp-p(VIDEO)
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

General

Embedded dual DDC support DDC1 and DDC2B,CI　
Zoom scaling up and down　
Embedded Pattern Generator　
No external memory required.　
Require only one crystal　 to generate all timing
Embedded reset control output　
Embedded crystal output to MICROP　
3 channels 8 bits PWM output, and selectable PWM clock frequency.

PIN DESCRIPTION

(I/O Legend: A= Analog, I=Input, O=Output, P=Power, G=Ground)

■ ADC: 15 pins

Name I/O Pin No Description Note

ADC_ GND AG 27 ADC ground
ADC_REFIO AP 28 ADC band-gap voltage de-coupling 1.20V
ADC_VDD AP 29 Analog power (3.3V)
BLUE+ AI 30 Analog input from BLUE channel
BLUE- AI 31 Analog input ground from BLUE channel
ADC_ GND AG 32 ADC ground
SOG/ADC_TEST AIO 33 SOG in/ADC test pin
GREEN+ AI 34 Analog input from GREEN channel
GREEN- AI 35 Analog input ground from GREEN channel
ADCB_VDD AP 36 Analog power (3.3V)
RED+ AI 37 Analog input from RED channel
RED_ AI 38 Analog input ground from RED channel
ADC_GND AG 39 Analog ground
ADC_GND AG 40 Analog ground
ADC_VDD AP 41 Analog power (3.3V)
AHS AI 42 Analog HS input (10), (4), (5)
AVS AI 43 Analog VS input (2), (4), (5)

■ PLL:8 pins

Name I/O Pin No Description Note
XO AI 1 Reference clock output
XI AO 2 Reference clock input
DPLL GND AG 3 Ground for digital PLL
DPLL VDD AP 4 Power for digital PLL (3.3V)
APLL VDD AP 5 Power for multi-phase PLL (3.3V)
PLL TEST1 AIO 6 Test Pin 1 / IRQ# 3.3V tolerance
PLL TEST2 AIO 7 Test Pin 2/Power-on-latch for crystal out

APLL GND AG 8 Ground for multi-phase PLL

Frequency

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■ Control Interface: 7 pins

Name I/O Pin No Description Note

SDIO [0] IO 54 Serial control I/F data in/Parallel port data

(2), (3), / 2mA

[0]
SDIO [1] / TCON [4] /
BBLU [0]
SDIO [2] / TCON [3] /
BBLU [1]
SDIO [3] / PWM2 /
TCON [2]

IO 53 Parallel port data [1] / TCON [4] / TTL

BBLU [0]

IO 52 Parallel port data [1] / TCON [3] / TTL

BBLU [1]

(1), (2), (3), /
2mA
(1), (2), (3), /
2mA

IO 51 Parallel port data [1] / TCON [4] / PWM2 (1), (2), (3), /

2mA
SCLK I 50 Serial control I/F clock (2), (3), (5)
SCSB I 111 Serial control I/F chip select (2), (3), (5)
RESET O 56 RESET output for Micron (2), (5), (6) / 2mA

■ Display & TCON/VIDEO-8 Port: 54 pins

:LVDS+RSDS+TTLO :RSDS+TTLO :RSDS+TTLIO :TTLO :TTLIO
Pin
NO

51 S [3] /

51

52 S [2] /

6-bits Dual

RSDS

TCON [2] /
PWM2

TCON [3]

6-bits Single

RSDS

S 3] /
TCON [2] /
PWM2
S [2] /
TCON [3]

8/6 bits

Dual/Single

LVD S
S [3] /
TCON [2] /
PWM2
S [2] /
TCON [3]

8 bits

Dual/Single

TTL
S [3] /
TCON [2] /
PWM2
S [2] /
BBLU [1] /

6 bits Dual

TTL

S [3] /
TCON [2] /
PWM2
S [2] /
TCON [3]

6 bits Single

TTL

S [3] /
TCON [2] /
PWM2
S [2] /
TCON [3]

Note

(1), (2), (3), /
2mA

(1), (2), (3), /
2mA

TCON [3]

53 S [1] /

TCON [4]

S [1] /
TCON [4]

S [1] /
TCON [4]

S [1] /
BBLU [0] /

S [1] /
TCON [4]

S [1] /
TCON [4]

(1), (2), (3), /
2mA

TCON [4]

55 PWM2 /

COUT /
TCON [13]

PWM2 /
COUT /
TCON [13]

PWM2 /
COUT /
TCON [13]

PWM2 /
COUT /
TCON [13]

PWM2 /
COUT /
TCON [13]

PWM2 /
COUT /
TCON [13]

(1), (2), (3), /
2mA

59 BB3P BB3P NC BBLU [7] BBLU [7] BBLU [7]
60 BB3N BB3N NC BBLU [6] BBLU [6] BBLU [6]
61 BB2P BB2P NC BBLU [5] BBLU [5] BBLU [5]
62 BB2N BB2N NC BBLU [4] BBLU [4] BBLU [4]
63 BB1P BB1P NC BBLU [3]

BBLU [3] BBLU [3]

/T0

64 BB1N BB1N NC BBLU [2]

BBLU [2] BBLU [2]

/T1

65 BCLKP BCLKP NC BGRN [1] /

TCON [6] TCON [6]

T2

66 BCLKN BCLKN NC BGRN [0] /

TCON [5] TCON [5]

T3

67 BG3P BG3P NC BGRN [7] BGRN [7] BGRN [7]
68 BG3N BG3N NC BGRN [6] BGRN [6] BGRN [6]

73 BG2P BG2P TODP

74 BG2N BG2N TODN

75 BG1P BG1P TOCLKP

76 BG1N BG1N TOCLKN

77 BR3P BR3P TOCP

78 BR3N BR3N TOCN

79 BR2P BR2P TOBP

BGRN [5] /
T4
BGRN [4] /
T5
BGRN [3] /
T6
BGRN [2] /
T7
BRED [7] /
T8
BRED [6] /
T9
BRED [5] /
T10

BGRN [5] BGRN [5]

BGRN [4] BGRN [4]

BGRN [3] BGRN [3]

BGRN [2] BGRN [2]

BRED [7] BRED [7]

BRED [6] BRED [6]

BRED [5] BRED [5]

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80 BR2N BR2N TOBP

81 BR1P BR1P TOAP

82 BR1N BR1N TOAP

85 AB3P NC TEDP

86 AB3N NC TEDN

87 AB2P NC TECLKP

88 AB2N

89 AB1P

90 BB1N

91 ACLKP

92 ACLKN

93 AG3P

AG3N NC

94

AG2P

99

AG2N TCON [10] NC AGRN [4] /

100

AG1P TCON [9] NC AGRN [3] /

101

AG1N TCON [8] NC AGRN [2] /

102

103 AR3P

104 AR3N

105 AR2P

106 AR2N

107 AR1P

108 AR1N NC

113 PWM2 /

COUT /
TCON [12]

114 TCON [11]

NC

NC

NC

NC

NC

NC

TECLKN

TECP

TECN

TEBP

TEBN

TEAP

TEAN

TCON [11]

NC AGRN [5] /

TCON [7] NC ARED [7] /

TCON [6] NC ARED [6] /

TCON [5] NC ARED [5] /

TCON [1] NC ARED [4] /

TCON [0] NC ARED [3] /

NC ARED [2] /

PWM2 /
COUT /
TCON [12]

PWM2 /
COUT /
TCON [12]

V [0] V [0] ARED [0] TCON [11] (1), (7), (8)

/V [0]

115 TCON [10]

V [1] V [1] BRED [1] TCON [10] (1), (7), (8)

/V [1]

116 TCON [9] /

V [2] V [2] BRED [0] TCON [9] (1), (7), (8)

V [2]

117 TCON [8] /

V [3] V [3] AGRN [1] TCON [8] (1), (7), (8)

V [3]

118 TCON [7] /

V [4] V [4] AGRN [0] TCON [7] (1), (7), (8)

V [4]

BRED [4] /
T11
BRED [3] /
T12
BRED [2] /
T13
ABLU [7] /
T14
ABLU [6] /
T15
ABLU [5] /
T16
ABLU [4] /

BRED [4] BRED [4]

BRED [3] BRED [3]

BRED [2] BRED [2]

ABLU [7] ABLU [7]

ABLU [6] ABLU [6]

ABLU [5]

ABLU [5]

ABLU [4] ABLU [4]
T17
ABLU [3] /

ABLU [3] ABLU [3]
T18
ABLU [2] /

ABLU [2] ABLU [2]
T19
ABLU [1] /
T20
ABLU [0] /
T21
AGRN [7] /
T22
AGRN [6] /

TCON [1] TCON [1]

TCON [0] TCON [0]

AGRN [7] AGRN [7]

AGRN [6] AGRN [6]
T23

AGRN [5] AGRN [5]
T24

AGRN [4] AGRN [4]
T25

AGRN [3] AGRN [3]
T26

AGRN [2] AGRN [2]
T27

T28

ARED [7] ARED [7]

ARED [6] ARED [6]
T29

ARED [5] ARED [5]
TH

ARED [4] ARED [4]
TV

ARED [3] ARED [3]
TE

ARED [2] ARED [2]
TK
ARED [1] COUT PWM2 /

COUT /
TCON [12]

(9)

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119 TCON [6] /

V [5] V [5] DHS DHS DHS (1), (7), (8)

V [5]

122 TCON [5] /

V [6] V [6] DVS DVS DVS (1), (7), (8)

V [6]

123 TCON [1] /

V [7]

124 TCON [0] /

V [7] V [7] DENA

DENA DENA (1), (7), (8)

VCLK VCLK DCLK DCLK DCLK (1), (7), (8)

VCLK

*Single RSDS, even/odd swap, data (59~82) output to pin85~108, TCON (99~108) output to pin59~68.
*In 6-bit dual TTL output mode, Video8 cannot output TCON7~TCON11; while video8 can output TCON in

6-bit single TTL mode.

■ TMDS: 18 pins

Name I/O Pin No Description Note

TMDS_TST/ PWM1 AIO 9 TMDS_TEST Pin / PWM1 / Power-on-latch

for serial / parallel port
TMDS_GND G 10
TMDS_VDD P 11 (3.3V)
NC A 12 Impedance Match Reference.
TMDS_VDD P 13 (3.3V)
NC I 14 Differential Data Input
NC I 15 Differential Data Input
TMDS_GND G 16
NC I 17 Differential Data Input
NC I 18 Differential Data Input
TMDS_VDD P 19 (3.3V)
NC I 20 Differential Data Input
NC I 21 Differential Data Input
TMDS_GND G 22
NC I 23 Differential Data Input
NC I 24 Differential Data Input
TMDS_GND G 25
TMDS_VDD P 26 (3.3V)

■ PWM Interface: (PWM1, PWM2 can be selected from 1 of 3 possible pins.)

Name I/O Pin No Description Note
PWM2 / TCON [2] / S
[3]
PWM2 / TCON [13] /

O 51 PWM2 / TCON [2] / SDIO [3] (1), (2), (3), (5),

(8),

O 55 PWM2 / TCON [13] / Crystal out (2), (8), (9)
COUT
PWM2 / TCON [12] /
COUT

O 113 PWM2 / TCON [12] / Crystal out (2), (8), (9) 6bit

dual TTL cannot
support

PWM1 / TMDS_TST AIO 9 PWM1/ TMDS_TEST Pin/ Power-on-latch

(2), (7), (8)

for serial / parallel port
PWM1 / DDCSDA /
TCON [1] / BBLU [0]

IO 47 PWM1 / DDC serial control I/F data input /

output / TCON [4]

(1), (2), (3), (5),
(8),

PWM1 / TCON [7] IO 125 PWM1 / TCON [7] (1), (2), (3), (5),

(8),

PWM0 / REFCLK IO 112 PWM0 / (In / out) test pin for DCLK /

(2), (9)

Video8 even-odd signal

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■ DDC Channel:4 pins

DDCSCL/TCON [0] /
BBLU [1]
DDCSDA/TCON [1] /
PWM1/BBLU [0]

TCON [5] I 126 TCON [5] (2), (3), (5)
TCON [7]/PWM1 IO 125 TCON [7]/ PWM1 (1), (2), (3), (5),

■ Power & Ground:22 pins

3.3V Power P 49,121 VCCIO: 2

3.3V Ground G 48,120 GNDIO: 2

3.3V Power P 58,71,83, 95,110 PVCC: 5

3.3V Ground G 57,72,84,96,109 PGND: 5

2.5V Power P 45,69,98,127 VCCK: 4

2.5V Ground G 44,70,97,128 GNDK: 4

Note: (1) TTL compatible CMOS Input (Vt=1.7V); VCC=3.3V;
(2) 5V tolerance pad;
(3) Internal 75K Ohms pull high resistor.
(4) Internal 75K Ohms pull low resistor.
(5) Schmitt trigger CMOS Input (Vt=1.4~2.2V);
(6) Open-Drain, Output Drive low & Pull-high.
(7) Bi-directional input/output
(8) Programmable driving current (2~10mA)
(9) TTL output 5V & 3.3V
(10) 4V tolerance pad

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.

Name I/O Pin No Description Note

I 46 DDC serial control I/F clock/TCON [0]/TTL

(2), (3), (5)

BBLU [1]

IO 47 DDC serial control I/F data input/ output/

TCON [1]/ PWM1/ TTL BBLU [0]

(1), (2), (3), (5),
(6), (8)/8mA/no
slew

(6), (8)/8mA/no
slew

Name I/O Pin No Description

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C. 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 signals 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. Adjusting Procedure

5.1. ADJUSTMENT CONDITIONS AND PRECAUTIONS

1. Approximately 30 minutes should be allowed for warm up before proceeding.

2. Adjustments should be undertaken only on those necessary elements since most of them have been carefully
preset at the factory.

3. ESD protection is needed before adjustment.

5.2. MAIN ADJUSTMENTS

NO. FUNCTION DESIGNATION

1. White Balance Function Key

2. GEOMETRY Function Key

5.3. ALIGNMENT PROCEDURES

Adjustment Conditions and Precautions:

(A). Power supply voltage:

AC 110/120V±10% 60 Hz±5%, AC 220/240V±10% 50 Hz ±5%.

(B). Warm up time:

The display must be power ON for at least 30 minutes at full white pattern before starting alignments.
This is especially critical in color temperature and white balance adjustments.

(C). Signals: reference the front detail specifications and timing table.

Video: reference the front detail specifications.

1. Adjustment of 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

release

“▲” and “ ”

“▲” and “ ”

key, Then press “ ” key go to factory mode. (Fig.1)

2

2

and turn on power at the same time after power LED is on,

1

(Fig.1)

F. Adjust Color Temperature:

(1) EEPROM INIT (5 BLOCKS):
Press “▼” key move cursor to EEPROM INIT, Press key then monitor will INIT ADC value.
(2) Press “▲” key move cursor to “White Balance”, Press key do white balance adjustment.
(3) Press “▼” key move cursor to “Color Temerature Adjust”, Press key, Then OSD will display

Fig.2

2

2

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(Fig.2)

(4) 9300K verify: move cursor to 9300K Press key.

Press “▼” ,“▲” key adjust R.G.B value

≧

240 cd/m

1

±

0.02

±

0.02

±

0.02

±

0.02

2

x=0.283
y=0.298
Press key return to Fig.2

(5) 6500K verify: Repeat (4) press “▼” ,“▲” move cursor to 6500K press key

x=0.313 ±0.02
y=0.329 ±0.02
Y

(6) 5400K verify: Repeat (4) press “▼” ,“▲” move cursor to 5400K press key
x=0.332
y=0.348

(7) Press key go back to Fig.2, Then press 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 Y≧240 cd/㎡
5400K: x=0.332 ±0.02 y=0.348 ±0.02

2. Geometry:

(a). Set cross-hatch pattern and preset timing as timing table listed.
(b). Change to each mode in turn and wait for the monitor finish auto-alignment and save process before

change to next mode.

(c). Until all of modes are agjusted, exit OSD menu and press PWR OFF to exit factory mode.

1

2

1

2

2

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5.4. Firmware update procedure :

When you receive the monitor , please check the firmware version is 11-23-04A. If not , please

following procedure to upgrade to the latest version .

1. Equipment needed :

- VA7

- PC ( Personal computer )

- LPT cable

- Fixture (LM5ISP)

- Firmware upgrade program

21/VE510s-2/VE710b-2

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