ViewSonic Q9b-3, VS11455 Service manual

Service Manual

ViewSonic Q9b-3

Model No. VS11455

19” Color TFT LCD Display

(Q9b-3_SM Rev. 1a Sep. 2006)

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

Copyright

Copyright © 2006 by ViewSonic Corporation. All rights reserved. No part of this publication
may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any
language or computer language, in any form or by any means, electronic, mechanical, magnetic,
optical, chemical, manual or otherwise, without the prior written permission of ViewSonic
Corporation.

Disclaimer

ViewSonic makes no representations or warranties, either expressed or implied, with respect to
the contents hereof and specifically disclaims any warranty of merchantability or fitness for any
particular purpose. Further, ViewSonic reserves the right to revise this publication and to make
changes from time to time in the contents hereof without obligation of ViewSonic to notify any
person of such revision or changes.

Trademarks

Optiquest is a registered trademark of ViewSonic Corporation.
ViewSonic is a registered trademark of ViewSonic Corporation.
All other trademarks used within this document are the property of their respective owners.

Revision History

Revision SM Editing Date ECR Number Description of Changes Editor

1a 9/15/2006 Initial Release Jamie Chang

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TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 4

3. Front Panel Function Control Description 7

4. Circuit Description 12

5. Adjustment Procedure 17

6. Troubleshooting Flow Chart 38

7. Recommended Spare Parts List 43

8. Exploded Diagram and Exploded Parts List 51

9. Block Diagram 55

10. Schematic Diagrams 56

11. PCB Layout Diagrams 64

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1. Precautions and Safety Notices

1. Appropriate Operation

(1) Turn off the product before cleaning.
(2) Use only a dry soft cloth when cleaning the LCD panel surface.
(3) Use a soft cloth soaked with mild detergent to clean the display housing.
(4) Disconnect the power plug from AC outlet if the product is not used for a long period of

time.

(5) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display

off.
(6) Do not touch the LCD panel surface with sharp or hard objects.
(7) Do not place heavy objects on the LCD display, video cable, or power cord.
(8) Do not use abrasive cleaners, waxes or solvents for your cleaning.
(9) Do not operate the product under the following conditions:

- Extremely hot, cold or humid environment.

- Areas susceptible to excessive dust and dirt.

- Near any appliance generating a strong magnetic field.

- Place in direct sunlight.

2. Caution

No modification of any circuit should be attempted. Service work should only be performed after
you are thoroughly familiar
with all of the following safety checks and servicing guidelines.

3. Safety Check

Care should be taken while servicing this LCD display. Because of the high voltage used in the
inverter circuit, the voltage is exposed in such areas as the associated transformer circuits.

4. Power Supply Requirements

The external AC power operating range shall be from 90 to 264Vac

5. LCD Module Handling Precautions

5.1. Handling Precautions

(1) Since front polarizer is easily damaged, pay attention not to scratch it.
(2) Be sure to turn off power supply when inserting or disconnecting from input connector.
(3) Wipe off water drop immediately. Long contact with water may cause discoloration or

spots.
(4) When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth.
(5) Since the panel is made of glass, it may break or crack if dropped or bumped on hard

surface.
(6) Since CMOS LSI is used in this module, take care of static electricity and insure human

earth when handling.
(7) Do not open nor modify the Module Assembly.
(8) Do not press the reflector sheet at the back of the module to any directions.
(9) In case if a Module has to be put back into the packing container slot after once it was

taken out from the container, do not press the center of the CCFL Reflector edge.

Instead, press at the far ends of the CFL Reflector edge softly. Otherwise the TFT

Module may be damaged.
(10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate nor

tilt the Interface Connector of the TFT Module.
(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for

example), do not twist nor bend the TFT Module even momentary. At designing the

enclosure, it should be taken into consideration that no bending/twisting forces are

applied to the TFT Module from outside. Otherwise the TFT Module may be damaged.
(12) Cold cathode fluorescent lamp in LCD contains a small amount of mercury. Please

follow local ordinances or regulations for disposal.
(13) Small amount of materials having no flammability grade is used in the LCD module.

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The LCD module should be supplied by power complied with requirements of Limited
Power Source (IEC60950 or UL1950), or be applied exemption.

(14) The LCD module is designed so that the CFL in it is supplied by Limited Current

Circuit (IEC60950 or UL1950). Do not connect the CFL in Hazardous Voltage Circuit.

5.2. Handling and Placing Methods

Correct Methods: Incorrect Methods:

Only touch the metal frame of the LCD panel
or the front cover of the monitor. Do not touch
the surface of the polarizer.

Take out the monitor with cushions Taking out the monitor by grasping the LCD

Surface of the LCD panel is pressed by fingers

and that may cause “Mura”

panel. That may cause “Mura”

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Place the monitor on a clean and soft foam pad. Placing the monitor on foreign objects. That

could scratch the surface of the panel or cause
“Mura”

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2. Specification

1. General Requirements

General Specifications

Test Resolution & Frequency “1280 x 1024” @ 60Hz
Test Image Size Full Size
Contrast and Brightness Controls Factory Default:

Contrast =100%, Brightness = 100%

2. Signal Interface

Video Interface

Analog Input Connector DB-15 (Analog)
Default Input Connector Defaults to the first detected input
Video Cable Connector DB-15 Pin out Compliant DDC 1/2B.
Video Signals 1. Video RGB (Analog) Separate Sync
Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)

Exclusions Not compatible with interlaced video.

3. Power

Power Supply

Input Voltage Range 90 to 264 VAC
Power Dissipation 37Watts (Typ.)

4. Electrical Requirements

Horizontal / Vertical Frequency

Horizontal Frequency 30 – 80 KHz
Vertical Refresh Rate 56– 75 Hz

* For resolution 1280 x 1024, the vertical

Refresh rate up to 75 Hz; for there rest
Resolutions, the vertical refresh rate up
To 75Hz.

Maximum Pixel Clock 135 MHz.

Sync Polarity Independent of sync polarity.

Timing Table

Item Timing Analog

1 640 x 480 @ 60Hz, 31.5kHz Yes
2 640 x 480 @ 67Hz, 35.0kHz Yes
3 640 x 480 @ 75Hz, 37.5kHz Yes
4 720 x 400 @ 70Hz, 31.5kHz Yes
5 800 x 600 @ 56Hz, 35.1kHz Yes
6 800 x 600 @ 60Hz, 37.9kHz Yes
7 800 x 600 @ 75Hz, 46.9kHz Yes
8 800 x 600 @ 72Hz, 48.1kHz Yes

9 832 x 624 @ 75Hz, 49.7kHz Yes
10 1024 x 768 @ 60Hz, 48.4kHz Yes
11 1024 x 768 @ 70Hz, 56.5kHz Yes
12 1024 x 768 @ 75Hz, 60.0kHz Yes
13 1280 x 1024 @ 60Hz, 63.4kHz Yes
14 1280 x 1024 @ 75Hz, 79.97kHz Yes

Changing Modes

Maximum Mode Change Blank Time for image
stability. Note:

1) Excluding “Auto Adjust” time

2) Under DOS mode (640 x 350, 720 x 400 & 640 x

400), there is no “Auto Adjust” feature.

3) The monitor needs to do “Auto Adjust” the first

time a new mode is detected.

Under 5 seconds (Maximum)
1 seconds (Typ.) for recognized timings
1-2 seconds (Typ.) for unrecognized timing

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5. LCD Panel

Panel Characteristics

st

Souce:

1

Panel Type HSD190ME13-A02
Type TN type with LVDS interface
Active Size 376.32 (H) x 301.06 (V)
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.294 mm
# of Backlights 4 CCFL edge-light (2 top / 2 bottom)
Backlight Life 40,000 Hours (minimum)
Panel Performance

Luminance –
Condition:
CT = 6500K, Contrast = Max,

250 cd/m2 (typ. after 30-minute warm-up)

Brightness = Max

Brightness Uniformity ≥ 80% Entire Area(Typ)
Contrast Ratio 600:1 (typ.), 450:1 (minimum)
Color Depth 16.2M colors (6-bits+2 bits FRC)
Viewing Angle (Horizontal) 140 degrees @ CR>10
Viewing Angle (Vertical) 130 degrees @ CR>10

Response Time

8ms(Typ.)

10%-90% @ Ta=25°C

nd

2

Panel Type 2

and 3

rd

Source:

nd

panel source : HSD190ME13-A10

rd

Panel source : HSD190ME13-A16

3

Type TN type with LVDS interface
Active Size 376.32 (H) x 301.056 (V)
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.294 mm
# of Backlights 4 CCFL edge-light (2 top / 2 bottom)
Backlight Life 40,000 Hours (minimum)
Panel Performance

Luminance –
Condition:
CT = 6500K, Contrast = Max,

300 cd/m2 (typ. after 30-minute warm-up)

Brightness = Max

Brightness Uniformity 75%(Typ)/70%min
Contrast Ratio 700:1 (typ.), 450:1 (minimum)
Color Depth 16.2million colors (6 bits+2bits data)
Viewing Angle (Horizontal) 160degrees @ CR>10
Viewing Angle (Vertical) 155 degrees @ CR>10

Response Time

8ms (Typ.)

10%-90% @ Ta=25°C

6. Mechanical

Dimensions

Width 407 mm
Height 414 mm
Depth 200 mm
Monitor Weight 4.85kg / 10.67 lbs

Ergonomics

Tilt Up 20 DEGREES MINIMUM
Tilt Down -5 degrees

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Package Specifications

Width 465 mm

Height 445 mm

Depth 150 mm

Gross Weight 5.55kg (12.21 lbs)

7. Environmental

Environmental Conditions

Operating Temperature 0°C to +40°C

Storage Temperature -20°C to +60°C

Operating Relative Humidity 10% to 90% RH Non-Condensing

Storage Relative Humidity 5% to 90% RH Non-Condensing

Operating Altitude 0 to +3,000 meters

Storage Altitude 0 to +12,000 meters

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3. Front Panel Function Control Description

Main Menu

with OSD controls

Front Control Panel

shown below in detail

Displays the Main

Menu or exits the

control screen and

saves adjustments.

Scrolls through menu options and adjusts the
displayed control.

Also a shortcut to display the Contrast adjustment
control screen.

Displays the control screen for the
highlighted control.

Also toggles between two controls on
some screens.

Also a shortcut to Auto Image Adjust.

Power light
Green = ON
Orange = Power Saving

Standby Power
On/Off

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Do the following to adjust the display setting:

1. To display the Main Menu, press button [1].

NOTE: All OSD menus and adjustment screens disappear automatically after about 30

seconds. This is adjustable through the OSD timeout setting in the setup menu.

2. To select a control to adjust, pressSorTto scroll up or down in the Main Menu.

3. After the desired control is selected, press button [2]. A control screen like the one shown

below appears.

The line at the bottom of the screen
shows the current functions of buttons 1
and 2: Exit or select the Brightness
control.

4. To adjust the setting, press the upSor downTbuttons.

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

The following tips may help you optimize your display:

• Adjust the computer's graphics card so that it outputs a 1280 x 1024 @ 60Hz video signal to
the LCD display. (Look for instructions on “changing the refresh rate” in the graphics 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 display.)

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Main Menu Controls

Adjust the menu items shown below by using the upSand downTbuttons.

Control Explanation

Auto Image 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 Image 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 adjusts background black level of the screen image.

Color Adjust provides several color adjustment modes, including preset color

temperatures and a User Color mode which allows independent adjustment of
red (R), green (G), and blue (B). The factory setting for this product is 6500K
(6500 Kelvin).

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

User Color Individual adjustments for red (R), green (G), and blue (B).

1. To select color (R, G or B) press button [2].

2. To adjust selected color, pressSorT.
Important: 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.

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Control Explanation

Information displays the timing mode (video signal input) coming from the
graphics card in the computer, the LCD model number, the serial number, and

®

the ViewSonic
instructions on changing the resolution and refresh rate (vertical frequency).

NOTE: VESA 1280 x 1024 @ 60Hz (recommended) means that the resolution
is 1280 x 1024 and the refresh rate is 60 Hertz.

Manual Image Adjust displays the Manual Image Adjust menu.

website URL. See your graphics card’s user guide for

The Manual Image Adjust controls are explained below:

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

H./V. Position (Horizontal/Vertical Position) moves the screen image left or

right and up or down.

Fine Tune sharpens the focus by aligning the text and/or graphics with pixel
boundaries.

Sharpness adjusts the clarity and focus of the screen image.

Setup Menu displays the menu shown below:

The Setup Menu controls are explained below:

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Control Explanation

Language Select allows the user to choose the language used in the menus and
control screens.

Resolution Notice advises the optimal resolution to use.

OSD Position allows the user to move the OSD menus and control screens.

OSD Timeout sets the length of time the OSD 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 the adjustments back to factory settings if the display is
operating in a factory Preset Timing Mode listed in the Specifications of this
manual.

Exception: This control does not affect changes made with the User Color
control, Language or Power Lock setting.

Audio Adjust
Vol ume increases the volume, decreases the volume, and mutes the audio.

Mute temporarily silences audio output.

Short Cut Key

Function Key : 5 Keys !!!! 1 2 ▼

[▼]+ [▲]

[1] Main Menu
[2] 1. Auto Image Adjust

2. toggle 720x400 and 640x400 mode when input
720x400 or 640x400 mode

[▼]
[▲]

to immediately activate Brightness menu.
to immediately activate Contrast menu.
recall both of Contrast and Brightness to default

▼▼▼

▲▲▲▲

[1] + [▼]
[1] + [▲]

[▼]+ [▲] +

No signal message OSD

Signal + [▲] + [2] + [ ]

Remark : All the short cuts function are only available while OSD off (exclude Power
Lock and OSD Lock)

Power Lock
OSD Lock
Burning mode

Factory Mode

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4. Circuit Description

A. DC-DC CONVERTER

This brick convert is the 110-220AC input voltage to 12V AND 5V output for invert use and
panel use and system controller use .
5V Out put at L804
VCC 12V In put at L803,F901

B. Scaling controller

The ADC is to convert RGB analog signal to digital signal that scaling chip can acknowledge.
The HSYNC input receives a logic signal and provides the frequency reference for pixel clock
generation.
The scaling IC is to converts the input signal ranging from VGA to SXGA into SXGA
resolution that panel can acknowledge.
The scaling IC is to converts the input signal ranging from VGA to SXGA into SXGA
resolution that panel can acknowledge.

GENERAL DESCRIPTION

The TSUM16AK is total solution graphics processing IC for LCD monitors with panel
resolutions up to SXGA. It is configured with a high-speed integrated triple-ADC/PLL, a high
quality display processing engine, and an integrated output display interface that can support
LVDS panel interface format. To further reduce system costs, the TSUM16AK also integrates
intelligent power management control capability for green-mode requirements and
spread-spectrum support for EMI management.
The TSUM16AK incorporates the world’s first coherent oversampled RGB graphics ADC in a
monitor controller system1. The oversampling ADC samples the input RGB signals at a
frequency that is much higher than the signal source pixel rate. This can preserve details in the
video signal that ordinarily would be lost due to input signal jitter or bandwidth limitations in
non-oversampled systems.
The TSUM16AK also incorporates a new Dynamic Frame Rate (DFR) generator2 for the
digital output video to the display panel that preserves the advantages of a fixed output clock

rate, while eliminating the output end of frame short-line.

PIN DESCRIPTION

Analog Interface

Pin Name Pin Type Function Pin

HSYNC0

VSYNC0

REFP

REFM

Schmitt Trigger Input
w/ 5V-tolerant

Schmitt Trigger Input
w/ 5V-tolerant

Analog
HSYNC

Analog VSYNC input

Internal ADC top de-coupling pin 62

Internal ADC bottom de-coupling pin 61

input

63

64

RIN0P Analog Input Analog red input 59

RIN0M Analog Input Reference ground for analog red input 58

SOGIN0 Analog Input Sync-on-green input 57

GIN0P Analog Input Analog green input 56

GIN0M Analog Input

BIN0P Analog Input

BIN0M Analog Input

REXT

Reference ground for analog
green

Analog
blue
Reference ground for analog
blue

External resistor 390 ohm to AVDD_ADC 51

input 54

input 55

input 53

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Serial Flash Interface

Pin Name Pin Type Function Pin

SDO Input w/ 5V-Tolerant

CSZ Output SPI Flash Chip Select 71

SCK Output SPI Flash Serial Clock 72

SDI Output

LVDS Interface

Pin Name Pin Type Function

LVA0M Output

LVA0P Output

LVA1M Output

LVA1P Output

LVA2M Output

LVA2P Output

LVA3M Output

LVA3P Output

LVACKM Output

Pin Name Pin Type Function Pin

LVACKP Output

LVB0M Output

LVB0P Output

LVB1M Output

LVB1P Output

LVB2M Output

LVB2P Output

LVB3M Output

LVB3P Output

LVBCKM Output

LVBCKP Output

SPI Flash
Serial

SPI Flash
Serial

A-Link Negative LVDS
Differential

A-Link Positive LVDS
Differential

A-Link Negative LVDS
Differential
A-Link Positive LVDS
Differential

A-Link Negative LVDS
Differential

A-Link Positive LVDS
Differential
A-Link Negative LVDS
Differential

A-Link Positive LVDS
Differential

A-Link Negative LVDS Differential Clock
Output

A-Link Positive LVDS Differential Clock
Output

B-Link Negative LVDS
Differential

B-Link Positive LVDS
Differential
B-Link Negative LVDS
Differential

B-Link Positive LVDS
Differential

B-Link Negative LVDS
Differential
B-Link Positive LVDS
Differential

B-Link Negative LVDS
Differential

B-Link Positive LVDS
Differential
B-Link Negative LVDS Differential Clock
Output

B-Link Positive LVDS Differential Clock
Output

Data Output 70

Data Input 73

Data
Output

Data
Output

Data
Output

Data
Output

Data

Output
Data
Output

Data

Output
Data

Output

Data

Output
Data
Output

Data

Output
Data

Output

Data

Output
Data

Output

Data

Output
Data
Output

Pin

114

113

112

111

110

109

106

105

108

107

127

126

125

124

123

122

119

118

121

120

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GPIO Interface

Pin Name Pin Type Function Pin

GPIO_P12 I/O w/ 5V-tolerant

PWM1/
GPIO_P25

GPIO_P00/
SAR1

GPIO_P01/
SAR2

GPIO_P02/
SAR3

GPIO_P03 I/O w/ 5V-tolerant

GPIO_P06 I/O w/ 5V-tolerant

GPIO_P07 I/O w/ 5V-tolerant

PWM0/
GPIO_P26

GPIO_P13 I/O w/ 5V-tolerant General

GPIO_P14 I/O w/ 5V-tolerant General

GPIO_P16/
PWM2

I/O w/ 5V-tolerant

I/O w/ 5V-tolerant

I/O w/ 5V-tolerant

I/O w/ 5V-tolerant

I/O w/ 5V-tolerant

I/O w/ 5V-tolerant

General Purpose Input/Output; 4mA
programmable driving strength

Pulse Width Modulation Output; 4mA
driving strength/ General Purpose
Input/Output; 4mA driving strength

General Purpose Input/Output; 4mA driving
strength/ SAR ADC Input

General Purpose Input/Output; 4mA driving
strength/ SAR ADC Input

General Purpose Input/Output; 4mA driving
strength/ SAR ADC Input

General Purpose Input/Output; 4mA
programmable driving strength

General Purpose Input/Output; 6/12mA
programmable driving strength

General Purpose Input/Output; 6/12mA
programmable driving strength

Pulse Width Modulation Output; 4mA
driving strength/ General Purpose
Input/Output; 4mA driving strength

Purpose Input/Output; 4mA
driving strength
Purpose Input/Output; 4mA

driving strength
General
Pulse

W

Purpose Input/Output; 4mA

driving strength/ idth Modulation

Output; 4mA driving strength

20

21

23

24

25

26

27

28

29

30

31

35

Pin Name Pin Type Function Pin

GPIO_P15

/PWM0

GPIO_P23

GPIO_P22

GPIO_P11/

I2C_MDA

GPIO_P10/

I2C_MCL

PWM2/

GPIO_P24

GPIO_P27

/PWM1

I/O w/
5V-tolerant

I/O w/
5V-tolerant
I/O w/
5V-tolerant

I/O w/
5V-tolerant

I/O w/
5V-Tolerant

I/O w/
5V-tolerant

I/O w/
5V-tolerant

General Purpose Input/Output; 4mA driving strength/ 69

Pulse Width Modulation Output; 4mA driving strength

General Purpose Input/Output; 4mA driving strength 74

General Purpose Input/Output; 4mA driving strength 75

General Purpose Input/Output; 4mA driving strength/ 76

I2C Master Data; 4mA driving strength

General Purpose Input/Output; 4mA driving strength/ 77

I2C Master Clock; 4mA driving strength

Pulse Width Modulation Output; 4mA driving strength/ 78

General Purpose Input/Output; 4mA driving strength

General Purpose Input/Output; 4mA driving strength/ 79

Pulse Width Modulation Output; 4mA driving strength

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Misc. Interface

Pin Name Pin Type Function Pin

BYPASS

RST Input w/ 5V-Tolerant Chip Reset; High Reset 19

RSTN Input w/ 5V-Tolerant Chip Reset; Low Reset 22

VCTRL Output Regulator Control 11

MODE[1:0] Input

DDCA_SDA/ I/O w/ 5V-tolerant

RS232_TX

DDCA_SCL/ Input w/ 5V-Tolerant DDC Clock for Analog Interface/ 66

RS232_RX

XIN Crystal

XOUT Crystal

Oscillator
Input
Oscillator
Output

For External Bypass Capacitor 4

Chip Configuration Input

MODE[1:0]

00

DDC Data for Analog Interface; 4mA
driving strength/

UART Transmitter/GPIO

UART Receiver/GPIO

Xin 32

Xout 33

102,

104

65

Power Pins

Pin Name Pin Type Function Pin

AVDD_ADC 3.3V Power ADC Power 44, 50, 60

AVDD_MPLL 3.3V Power MPLL Power 34

AVDD_PLL 3.3V Power PLL Power 52

VDDP 3.3V Power Digital Output Power 14, 67, 95, 103, 115

Pin Name Pin Type Function Pin

VDDC 1.8V Power Digital Core Power 12, 68, 97, 117

GND Ground Ground

13, 38, 41, 47, 96,
116

No Connects

Pin Name Pin Type Function Pin
NC No connects 1-3, 5-10, 15-18,

36, 37, 39, 40, 42,
43, 45, 46, 48, 49,
80-94, 98-101, 128

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

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MOSFET pair to boost AC output up to hundreds of voltage.
And one resister is serial to lamp for output voltage feedback.
There are two signal to control the inverter which come from system.
Logic “high” level which send to I901 is turn on the inverter.
BRI signal control brightness by DC level which was integral from PWM signal.

AUDIO
General description

The TDA7496L is a stereo 2W+2W class AB
power amplifier assembled in the @ Powerdip
14+3+3 package, specially designed for high
quality sound, TV and Monitor applications.
Features of the TDA7496L include linear volume
control, Stand-by and mute functions
Ipeak Output Peak Current (internally limited) 0.7 0.9 A
Vin Input Signal 2.8 Vrms

GV Closed Loop Gain Vol Ctrl > 4.5V 28.5 30 31.5 dB
GvLine Monitor Out Gain Vol Ctrl > 4.5V; Zload > 30K 　-1.5 0 1.5 dB

AMin VOL Attenuation at Minimum Volume Vol Ctrl < 0.5V 80 dB
BW 0.6 MHz

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

VS DC Supply Voltage 26 V
VIN Maximum Input Voltage 8 Vpp
Ptot Total Power Dissipation (Tcase = 60°C) 6 W
Tamb Ambient Operating Temperature 0 to 70 °C
Tstg, Tj Storage and Junction Temperature -40 to 150 °C
V6 Volume CTRL DC voltage 7 V
0 4 8 12 Area(cm2)

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5. Adjustment Procedure

1. Function Test

1.1. Product

- 19” LCD Monitor

1.2. Test Equipment

- Color Video Signal & Pattern (or PC with SXGA resolution and a sound card)

1.3. Test Condition

Before function test and alignment, each LCD Monitor should be run-in and warmed up for
at least 30 minutes with the following conditions:
(a) In room temperature,
(b) With full-white screen, RGB, and Black
(c) With cycled display modes,

640*480 (H=43.27kHz, V=85Hz)
800*600 (H=53.7kHz, V=85Hz)
1024*768 (H=68.67kHz, V=85Hz)
1280*1024 (H=79.97kHz, V=75Hz)

1.4. Test Display Modes & Pattern

1.4.1 Compatible Modes

Item Timing

1 640 x 480 @ 60Hz, 31.5kHz
2 640 x 480 @ 67Hz, 35.0kHz
3 640 x 480 @ 75Hz, 37.5kHz
4 720 x 400 @ 70Hz, 31.5kHz
5 800 x 600 @ 56Hz, 35.1kHz
6 800 x 600 @ 60Hz, 37.9kHz
7 800 x 600 @ 75Hz, 46.9kHz
8 800 x 600 @ 72Hz, 48.1kHz

9 832 x 624 @ 75Hz, 49.7kHz
10 1024 x 768 @ 60Hz, 48.4kHz
11 1024 x 768 @ 70Hz, 56.5kHz
12 1024 x 768 @ 75Hz, 60.0kHz
13 1280 x 1024 @ 60Hz, 63.4kHz
14 1280 x 1024 @ 75Hz, 79.97kHz

1.4.2 Function Test Display Pattern

Item Test Content Pattern Specification Remark

1 Frequency &

Tracking

2 Contrast/Brightness 16 Gray Scale 16 gray levels should be

3 Boundary Horizontal &

4 RGB Color

Performance

5 Screen Uniformity

& Flicker

6 Dead Pixel/Line White Screen &

Fine Line Moire Eliminate visual wavy noise. Figure 1

Figure 2
distinguishable.
Horizontal and Vertical position

Vertical Thickness

RGB Color
Intensities
Full White Should be compliant with the

Dark Screen

of video should be adjustable to
be within the screen frame.
Contrast of each R, G, B, color
should be normal.

spec.
The numbers of dead pixels
should be compliant with the
spec.

Figure 3

Figure 4,

5, 6

Figure 7

Figure 7,

8

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7 White Balance White & Black

Pattern

Fine Line Morie Pattern (Figure1) Gray Scale Pattern (Figure2)

The screen must have the pure
white and black pattern, no other
color.

Figure 9

Horizontal & Vertical Thickness Pattern (Figure 3) R. Color Pattern (Figure 4)

G. Color Pattern (Figure5) B. Color Pattern (Figure 6)

Full White Patter (Figure 7) Dark Screen Pattern (Figure 8)

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