ViewSonic VA521,VLCDS27996-1W,VE510b-2,VE510s-2,VLCDS27996-2W,VLCDS279963W Service manual

Service Manual

ViewSonic VA521

VE510b/s-21

Model No. VLCDS27996-1W

Model No. VLCDS27996-2W/-3W

15” Color TFT LCD Display

ViewSonic

(VA521/VE510b/s-2_SM_819_1c Rev. 1c Oct. 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

1c

Documents Number

DCN Number ECR Number

02/11/04

04/05/04

10/25/04 4777

4207

4280

Revision History

4701

Initial Release

Add VE510b/s-2

Change Scaler from MST P/N: 2365929596
To RealTek 2013 P/N: 2365930996

Description of Changes EditorRevision SM Editing Date

A. Lu

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

5

10

16

17
19

35
44
45

51

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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 are 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 magnetic 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 specified in the parts list may
create shock, fire, or other hazards.

1.3 SERVICE NOTES

.

When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.

.

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.

.

Keep wires away from high voltage, high temperature components and sharp edges.

.

Keep wires in their original position so as to reduce interference.

.

For usage of this product please also refer to the user's manual.

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2. Specification

2.1. PRODUCT SPECIFICATION

LCD Panel 15.0" TFT

Power Management Energy Star compliant VESA
DPMS compatible
< 1W

Viewing Angle CR≧10

Vertical: -55°~+45°

Tilt +20°~ 0°

Displayable Resolution XGA 1024× 768 (max.)

Pixel Dimension 0.297× 0.297mm

LCD Display Color 16.2M Color Max. (8bit)

Horizontal: -60°~+60°

Contrast Ratio 300: 1 (min.)

Brightness 200 cd/m

Response Time Tr: 9 ms Tf: 16ms (typ.)

Active Display Area 304.1mm× 228.1mm

Temperature Operating: 0°C ~ +35°C
Storage: -20°C ~ +60°C

Power Input Voltage: 100~240 Vac
Consumption: 30 Watts (Max.)

2.2. SUPPORTING TIMING CHART

400 : 1 (typ.)

2

(min.)

250 cd/m2 (typ.)

ITEM 1 2 3 4 5

TIMING 640×350@70Hz 640×480@60Hz 640×480@67Hz 640×480@75Hz 640×480@72Hz
Pixel Rate 25.175MHz 25.175MHz 30.240MHz 31.500MHz 31.500MHz
H TOTAL 31.778us 31.778us 28.571us 26.667us 26.413us
H DISPLAY 25.422us 25.422us 21.164us 20.317us 20.317us
H B-Porch 1.907us 1.907us 3.175us 3.810us 4.063us
H Width 3.813us 3.813us 2.116us 2.032us 0.270us
H Border 0.318us 0.318us 0.000us 0.000us 0.000us
V TOTAL 14.268ms 16.683ms 15.000ms 13.334ms 13.734ms
V DISPLAY 11.122ms 15.253ms 13.714ms 12.800ms 12.678ms
V B-Porch 1.907ms 1.049ms 1.114ms 0.427ms 0.528ms
Vs Width 0.064ms 0.064ms 0.086ms 0.080ms 0.079ms
V Border 0.191ms 0.254ms 0.000ms 0.000ms 0.000ms
H/V Sync +/- -/- -/- -/- -/­Interlace No. No. No. No. No.

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ITEM 6 7 8 9 10

TIMING 640×480@85Hz 720×400@70Hz 800×600@56Hz 800×600@60Hz 800×600@72Hz
Pixel Rate 36.000MHz 28.322MHz 36.000MHz 40.000MHz 50.000MHz
H TOTAL 22.111us 31.778us 28.444us 26.400us 20.800us
H DISPLAY 17.778us 25.422us 22.222us 20.000us 16.000us
H B-Porch 2.222us 1.907us 3.556us 2.200us 1.280us
H Width 1.556us 3.813us 2.000us 3.200us 2.400us
H Border 0.000us 0.318us 0.000us 0.000us 0.000us
V TOTAL 11.764ms 14.268ms 17.778ms 16.579ms 13.853ms
V DISPLAY 11.093ms 12.711ms 17.066ms 15.840ms 12.480ms
V B-Porch 0.578ms 1.112ms 0.626ms 0.607ms 0.478ms
Vs Width 0.069ms 0.064ms 0.057ms 0.106ms 0.125ms
V Border 0.000ms 0.222ms 0.000ms 0.000ms 0.000ms
H/V Sync -/- -/+ +/+ +/+ +/+
Interlace No. No. No. No. No.

ITEM 11 12 13 14 15

TIMING 800×600@75Hz 800×600@85Hz 832×624@74.5Hz 1024×768@60Hz 1024×768@70Hz
Pixel Rate 48.500MHz 56.250MHz 57.280MHz 65.000MHz 75.000MHz
H TOTAL 21.333us 18.631us 20.112us 20.677us 17.707us
H DISPLAY 16.162us 14.222us 14.525us 15.754us 13.653us
H B-Porch 3.232us 2.702us 3.771us 2.462us 1.920us
H Width 1.616us 1.138us 1.118us 2.092us 1.813us
H Border 0.000us 0.000us 0.000us 0.000us 0.000us
V TOTAL 13.333ms 11.756ms 13.417ms 16.666ms 14.272ms
V DISPLAY 12.800ms 11.179ms 12.552ms 15.880ms 13.599ms
V B-Porch 0.448ms 0.503ms 0.784ms 0.600ms 0.513ms
Vs Width 0.064ms 0.056ms 0.060ms 0.124ms 0.106ms
V Border 0.000ms 0.000ms 0.00ms 0.000ms 0.000ms
H/V Sync +/+ +/+ -/- -/- -/­Interlace No. No. No. No. No.

ITEM 16 17

TIMING 1024×768@72Hz 1024×768@75Hz
Pixel Rate 77.066MHz 78.750MHz
H TOTAL 17.232us 16.660us
H DISPLAY 13.287us 13.003us

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H B-Porch 1.869us 2.235us
H Width 1.765us 1.219us
H Border 0.000us 0.000us
V TOTAL 13.889ms 13.328ms
V DISPLAY 13.234ms 12.795ms
V B-Porch 0.500ms 0.466ms
Vs Width 0.103ms 0.050ms
V Border 0.000ms 0.000ms
H/V Sync -/- +/+
Interlace No. No.

2.3. D-SUB CONNECTOR

D-SUB 15 PIN CONNECTOR

1.Red Video 6.Red GND 11.NC

12345

678910

11 12 13 14 15

2.Green Video 7.Green GND 12.SDA

3.Blue Video 8.Blue GND 13.H-sync

4.NC 9. +5V for DDC 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

Displays, saves
changes to, and exits
the Main Menu.

Selects a highlighted control. Also,
displays the control screen for the
selected control and toggles
between control pairs.

Front Control Panel

Power light

Scroll through menu
options and adjust the
displayed control.

Power On/Off

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Do the following to adjust the screen image:

.

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.

.

To highlight a control you want to adjust, press I or J to scroll up or down

the Main Menu.

.

To select the highlighted control, press button [2]. A control screen appears

like the example shown below.

Contrast

1:EXIT 2: Brightness

.

To adjust the control, press the up I or down J buttons.

.

To save the adjustments and exit the menu, press button [1] twice.

The line at the
bottom of the
screen tells you
what you can do
next: Exit or Select
the control that is
highlighted.

The following tips may help you optimize your display:

Adjust your computer's graphic card so that it outputs a video signal 1024 x

•
768 @ 60 Hz to the LCD display. (Look for instructions on“changing the

refresh rate” in your graphic card's user guide.)

•If necessary, make small adjustments using H. POSITION and V. POSITION

until the screen image is completely visible
edge of the screen should barely touch the illuminated “active area” of the

LCD display.)

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Main Menu Controls

Adjust the menu items shown below by using the up Iand down Jbuttons.

Contro Explanation

Auto Adjust

automatically sizes, centers, and fine tunes the

videosignal 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 display, 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.

5400K

User Color

and blue (B)

1
2

Important

— Adds green to the screen image for a darker color.

— Individual adjustments for red (R), green (G),

.

To select color (R, G or B) press button [2].
To adjust selected color, press ▲ or ▼.

: If you select RECALL from the Main Menu when
the product is set to a Preset Timing Mode, colors return to the
6500K factory preset.

Information

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).

displays the timing mode (video signal input)

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VESA 1024 x 768 @ 60 Hz (recommended) means that the
resolution is 1024 x 768 and the refresh rate is 60 Hertz.

Information

H. Frequency: 48.60 KHz

V. Frequency: 60.00 Hz

Pixel Clock: 65.00 MHz

Resolution: 1024 x 768

Model Number: VLCDS23585-2W

Serial No:

www.viewsonic.com

1:EXIT

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:

Fine Tunesharpens focus by aligning the illuminated text and/

(Horizontal Size) adjusts the width of the screen image.

Vertical size is automatic with your LCD display.

or graphic characters.

NOTE:TrytheAuto Adjustbefore using the Fine

Tune control.

Sharpness

Setup Menu displays the menu shown below.

OSD

adjusts the clarity and focus of the screen image.

Setup Menu

Language Select

Resolution Notifier

OSD Position

OSD Timeout

1:EXIT 2:SELECT

The Setup Menu controls are explained below.

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L

anguage

Selectallowsyoutochoosethelanguageusedin

the menus and control screens.

OSD

Short Cut Key

Function Key : 5 Keys !!!! 1 2 ▼

Resolution Notice

Resolution Notice

For best picture quality

change the resolution to

1024 x 768

1:EXIT 2:DISABLE

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.

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.

▲▲▲▲

▼▼▼

[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] + [▼▼▼▼] + [▲▲▲▲]

(Keep pushing 5 sec)

[1] + [▼▼▼▼]

[1] + [▲▲▲▲]

White Balance.

Power Lock

OSD Lock

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4. Circuit Description

(VA521/VE510s-2/VE510b-2 Realtek Scaler)

A. AC-DC CONVERTER

The power supply with a high-integrated green-mode PWM controller provides several features to enhance the
performance of power flyback converters.
I801 is a PWM controller and provides many protection functions.
I802 is a photo couple to transfer the feedback signal from the second side wh ich I803 detected both of the output
DC voltage on 3.3V and 12V.
D813 detected the working voltage o n I801 and Q805 would pull down the voltage on I8 01 pin5 to shut down
I801 if feedback loop was failed.
R826 would be a dynamic load which was active while backlight was turned off and system still working on, this
kept 12V output voltage under 13V to protect the panel. After system went to power saving mode, the R826
would no loaded. This was detected by I804 and Q803 active the R826 to load or not.

B. Scaling controller

The RTD2013 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 XGA into XGA resolution that panel can
acknowledge.

General

 Embedded dual DDC support DDC1, DDC2B,DDC/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)

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■ 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 fo r dig ital 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

Frequency

APLL GND AG 8 Ground for multi-phase PLL

■ 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] /

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

LVDS
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]

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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
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

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] /

BGRN [5] /
T4
BGRN [4] /
T5
BGRN [3] /
T6
BGRN [2] /
T7
BRED [7] /
T8
BRED [6] /
T9
BRED [5] /
T10
BRED [4] /
T11
BRED [3] /
T12
BRED [2] /
T13
ABLU [7] /
T14
ABLU [6] /
T15
ABLU [5] /
T16
ABLU [4] /
T17
ABLU [3] /
T18
ABLU [2] /
T19
ABLU [1] /
T20
ABLU [0] /
T21
AGRN [7] /
T22
AGRN [6] /
T23

T24
T25
T26
T27

T28
T29
TH
TV
TE

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]
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]
ABLU [3] ABLU [3]
ABLU [2] ABLU [2]

TCON [1] TCON [1]
TCON [0] TCON [0]
AGRN [7] AGRN [7]

AGRN [6] AGRN [6]
AGRN [5] AGRN [5]
AGRN [4] AGRN [4]
AGRN [3] AGRN [3]
AGRN [2] AGRN [2]

ARED [7] ARED [7]
ARED [6] ARED [6]

ARED [5] ARED [5]
ARED [4] ARED [4]
ARED [3] ARED [3]

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108 AR1N NC
113 PWM2 /

COUT /
TCON [12]

114 TCON [11]

PWM2 /
COUT /
TCON [12]
V [0] V [0] ARED [0] TCON [11] (1), (7), (8)

NC AR ED [2] /

TK

PWM2 /

ARED [1] COUT PWM2 /
COUT /
TCON [12]

ARED [2] ARED [2]

(9)
COUT /
TCON [12]

/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]

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

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

for serial / parallel port
PWM1 / DDCSDA /
TCON [1] / BBLU [0]
PWM1 / TCON [7] IO 125 PWM1 / TCON [7] (1), (2), (3), (5),

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

■ DDC Channel:4 pins

Name I/O Pin No Description Note
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

Name I/O Pin No Description

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

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

output / TCON [4]

Video8 even-odd signal

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

BBLU [1]

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

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

(2), (7), (8)

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

(8),
(2), (9)

(2), (3), (5)

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

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

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C. 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.

D. INVERTER

In order to drive the CCFLs embedded in the panel module, there is a push-pull inverter to convert by the
controller.
from input 12V up to hundreds of AC volta ge output peak to peak.
The inverter is formed by symmetric in order to drive the separate lamp modules.
The input stage consists of a PWM controller, push-pull inverter, and switching MOSFET to convert DC input
into AC output.
The output stage consists of a tuning capacitor, transformer, and push-pull MOSFET pair to boost AC output up
to hundreds of voltage peak to peak.
And one resister is serial to lamp for output volt a ge feedback.

There are two signals which control the inverter come from system to turn on the inverter and control brightness.
Logic “low” 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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