ViewSonic N3250wb-1G Service Manual

Service Manual

ViewSonic N3250wb-1G

Model No. VS11752-1G

32” LCD TV

(N3250wb-1G_SM Rev. 1a May. 2007)

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

Copyright

Copyright © 200

7 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 warr anties, 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.

Revision History

Revision SM Editing Date ECR Number Description of Changes Editor

1a 05/15/07 Initial Release Sophia Kao

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All other trademarks used within this document are the property of their respective owners.

The lamp in this product contains mercury. Please dispose of in accordance with local, state or federal laws.

Product disposal at end of product life

TABLE OF CONTENTS

1. Precautions and Safety Notices.................................................................1

3. Front Panel Function Control Description................................................ 9

4. Circuit Description.......................................................................................17

5. Adjustment Procedure................................................................................18

6. Trouble Shooting Flow Chart................................................................ .....42

7. Block Diagram.............................................................................................45

8. Schematic Diagrams....................................................................................46

9. PCB Layout Diagrams.................................................................................58

10. Exploded Diagram And Exploded Parts List...........................................66

11. Recommend Spare Parts List...................................................................69

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2. Specification.................................................................................................4

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.

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.

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1. Precautions and Safety Notices

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.

Surface of the LCD panel is pressed by fingers

and that may cause “Mura”

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

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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Parameter Specification

LCD Type

a-Si TFT Active Matrix Wide Color, Transmissive Mode, Normally

Black
LCD Interface 1-Channel LVDS
Resolution (Native) WXGA, 1366 x 768
Display Area 32” diagonal; 697.68 (H) x 392.25 (V)
Pixel Pitch 0.51075(H) × 0.51075(V) mm
Viewing Angle

H = +/- 85°, V = +/- 85° with CR≥10 (Point-5)
Contrast Ratio 1200:1 (Typ); 800:1 (Min)
Brightness 500 nits (Typ.); 400 nits (Min)
Response Time 8ms, (Typical), g-g
Color Gamut NTSC 75% Typ
Brightness Uniformity 75%
Chromaticity (CIE1931) 9300K (Standard Mode Only)
Colors 16.7M
Surface Treatment Hard coating 3H
Backlight 14 CCFLs (Cold cathode Fluorescent Lamp)

Panel Acceptance

Refer to the panel acceptance criteria specification.

Note: Intermittent and/or Display Pattern defects which result in

further bright or dark dots will be counted individually against the

above specification.

Front Screen Artifacts

VS Standard:

a.) No Visible Streaking, Sag or Smearing artifacts when driven by

the specified video cards in the primary mode (VGA at 60 Hz)
and after user adjustment

b.) No image drift or lose fine-tune settings due to panel temperature

change
Note: Panel performance characteristics “ MUST BE” met in all display modes/inputs at
standard test conditions.

1. RF Tuner

RF tuner of this product shall be provided by” LG TAPQ-S701D” and “LG TAPE-S701D” for
PAL/SECAM. The following table defines this tuner specification.

Parameter Specification

RF Input Level 0 ~ 15dBmV

RF Tuning Range

PAL B/G: 48.25 to 855.25 MHz, for Off-Air and CATV
PAL D/K: 49.75 to 855.25 MHz for Off-Air and CATV
PAL I: 471.25 to 855.25 MHz for Off-Air and CATV
SECAM D/K 55.75 to 791.25 MHz for Off-Air and
CATV

PAL/SECAM: 48.25 MHz to 855.25 MHz
RF Tuner Sensitivity (S/N Ratio at
un-weight)

-45 dB (min.)

Channel Bandwidth

PAL: 7/8 MHz Maximum

SECAM: 8 MHz Maximum

CVBS Characteristics:
Video Amplitude Signal
DC Level Sync Pulse

0.7(min.)–1.1(max.) V

Typical. 0.35 V
Audio Characteristics:
AF Output Level Measured via LP
20 kHz Filter, RMS Decoder,
50us De-emphasis
THD

S/N

Typical. 0.35Vrms

0.5% (max.)

44 dB (min.)
Compatible system TUNER SECAM/PAL

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2. Specification

2. Video

Built-in A/D converter shall provide analog to digital converter for this product.

Input Parameter Specification

CVBS Characteristics:
Video Amplitude Signal
DC Level Sync Pulse

0.7(min.)–1.1(max.) V

Typical. 0.35 Vp-p
S-Video Characteristics:
Video Amplitude Signal
DC Level Sync Pulse

Y :0.7- 1.0Vp-p W / Neg. Sync (IN 75 Ω )

C : 0.286Vp-p (IN 75 Ω )

Y, Cb,Cr Characteristics:
Video Amplitude Signal
DC Level Sync Pulse

Y:1.0Vp-p(IN 75 Ω)

Pb:0.7 –1.0Vp-p(IN 75 Ω),Pr:0.7-1.0 Vp-p(IN 75 Ω)

Video Bandwidth PAL: 7/8 MHz Maximum SECAM: 8 MHz Maximum
HDMI Characteristics digital (DVI-D) applicable
RGB Characteristics:
Signal Type
Sync Type
Input Signal Rating
Sync Level:
Frequency Range
Pixel Color

Analog VGA

TTL, Separate Sync, with 4.7KΩ pull-down resistors

1250mv Max without damage to the product, 0-700 mv Full Range

2.5-5.25 V

Horizontal: 30-80K Hz, Vertical: 50-75 Hz

16 M

3. Audio

Audio amp of this product shall be provided by “YAMAHA” with a Model Number of YDA138.
In addition, a pair of speakers shall be integrated within this product. The audio signals of this product
shall comply with the specification listed in the following table.

Parameter Specification

Phone Jack out
Tuner Input Base band Input
Speaker Power Output Max

Rating

10W at 10 % T.H.D Distortion 10W at 10 % T.H.D Distortion

Speaker Impedance

6 Ω

6 Ω

Line In Per Tuner Spec

500 mV rms (Typ)

1.6 V rms (Max)

Impedance: 600 ohms

Line Out

500 mVrms +/- 10%
@1K Hz tone (with +/-25k Hz
deviation at input, volume
with non-attenuation and
loading with 47k Ohm)

500 mVrms +/- 10%
@1K Hz tone (with +/-25k Hz
deviation at input, volume
with non-attenuation and

loading with 47k Ohm)
Flatness of Amplitude Response
(100Hz ~ 10KHz)

+/- 3 db (at 1KHz @1W) +/- 3 db (at 1KHz @1W)

Total Harmonic Distortion
(1KHz @1W)

2% 1%

Signal to Noise (1KHz @1W) 30 dB (40Hz to 15KHz) 35dB(400Hz to 20 kHz)

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4. Electrical

The following table defines the electrical specification of this product.

ELECTRICAL SPECIFICATION

Power Input Voltage Range 100-240VAC +/- 10% Wide Range

Input Frequency Range 47-63 Hz

Input Current

2.5A @ 115VAC // 1.5A @ 230VAC

Power Supply Inrush

Max in < 150A (with fully loaded power supply) at
230Vac
Shall not result in permanent failure of power supply
(including blown fuse)

Power Consumption: Normal Normal: 170 W/ 200W (Max) // Sleep: < 3W

Interference with RF and Video

There shall be no visible interference between power
supply, RF and video signals. This applies to all available
RF channels and video modes.

Electromagnetic Compatibility

This product shall adhere to the compatibility and

immunity specifications in CB/CE
Power Supply Transient Immunity
(Supply Transients and Outage)

Able to withstand an IEC6100-4-4(1995) ring wave with no

damage.

Surge Immunity Test

Able to withstand 1.5X nominal Line Voltage for one cycle

with no damage.

Power Supply Missing Cycle Immunity

Function properly without reset or visible screen artifact

when ½ cycle of AC Power is randomly missing.

Power Supply Acoustics

Power supply shall not produce any audible noise during

startup and normal operation. Audible shall define to be

in compliance with ISO 7779 (DIN EN27779: 1991) .

Power Switch noise shall be Excluded.
Efficiency >= 70% @ full load, nominal line

Leakage Current <0.5mA @ 250VAC

Power Saving(DPMS)

When system is “OFF”, some minimal (<3W) power shall

be consumed.
Recovery Time < 3 sec.

Power Factor Correction Compliant with EN60065

5. Firmware & OSD

The product firmware of N3250WB(G) shall have a firmware version of VP01. Any
changes/revisions afterward shall also be pre-approved by ViewSonic in written. For N3250WB(G),
its firmware shall have a built-in frequency table for PAL off-air TV/CATV.

All audio/video and other output adjustments shall be performed by using an On Screen Display
(OSD) via a Remote Control Unit (RCU) in conjunction with the front panel adjustments. The
following tables list the OSD functions supported by N3250WB(G).

OSD Table for N3250WB(G)

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6. Remote Control Unit (RCU)

An IR remote control unit shall accompany this product along with battery. In addition,
this remote control unit shall have an operational distance of 5 meters and an operational
angle of 15 degrees for both horizontal and vertical.

Parameter Specification

Type IR; Made by Bontech Electronics Co., Ltd.

Range

Off axis ± 15° ≥ 5M On axis: ≥ 7M

Life Testing
(Buttons)

100,000 cycle operations at a rate of 20~30 cycle / minute without load (with
battery)

Color

Painting Color - PANTONE 427C (Black for front bezel & back cover)
Power Key - PANTONE 032C (RED)
Key Pads – PANTONE 11C & PANTONE 5C(Cool Gray)
Texts Printed on Front Cover and Key Pads - PANTONE 427C, PANTONE
433C(Black)

Key
Functions

AV Control: Volume-Up/Dowm,CH/PG-Up/Down,Channel
Up/Down,Mute,PIP/POP,Wide,Sleep/Info,P.Source,Swap,Power,Source.
Numeric: 0~9 numeric keys,Recall.
Navigation: Up,Down,Left,Right,Enter,Menu.
Smart sound and Smart video hot key

Items Description

TV / VIDEO MODE

Contrast Adjust the White levels from 0 to 100
Brightness Adjust the Black levels from 0 to 100
Colour Adjust the color from light to heavy
Tint Adjust from Red to Green
Sharpness Adjust the Sharpness levels from 0 to 100
Fresh Tone Adjust the skin from shallow to deep
Color Temp. Select the color temperature between warm, Normal or cool.
Reset Reset Picture Function setting
Bass Adjust the Low Frequency from light to heavy
Treble Adjust the Hi Frequency from light to heavy
Balance Adjust the Speaker output from left to right
Equalizer To adjust the Equalizer Function setting
Reset Reset Sound Function setting.
Auto scan To auto scan the TV channels (TV or CATV) and scan TV system.
Manual store To adjust the channel search and fine tune or system select.
Main source To select input source
H-position To adjust H position
V-position To adjust V position
OSD Language To adjust the OSD Language select
Reset Reset Option Function setting.

PC MODE

Auto adjust Automatically adjust the clock, phase, position, and color.
Contrast Adjust the White levels from 0 to 100
Brightness Adjust the Black levels from 0 to 100
H.Position Adjust the horizontal positions
V.Position Adjust the vertical positions
Clock To adjust the clock delay time.
Phase To adjust the phase delay time.
Color mode To select the preset color temperature or user color setting.

OSD adjust

H-position To adjust the OSD H position
V-position To adjust the OSD V position
Duration To adjust the OSD display delay time
Reset Reset OSD Function setting.

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7. Mechanical

The following table defines the mechanical specifications of this product for both chassis and
cabinet.

Parameter Specification

Dimension

W/O stand

W=800mm, H=631.6mm and D=210mm

W=800mm, H=573.5mm and D=117.6 mm
Net Weight 16.91 kg
Chassis Plastic Material ABS (ABS HB / ABS VO / PC+ABS/HIPS+MICA)
External Plastic Chassis
Components

Plastic Chassis, Cover, Stand (Metal + Plastic),Len and

Button
Internal Plastic Cabinet
Components

N/A

Exterior Chassis Color Refer to N3250WB-G Product ID
Chassis Component’s Color
Difference

Refer to N3250WB-G Color Guide

Chassis Color Drift Due to
UV-Light

The color drift due to UL-Light shall be less than 10 “Delta

E” in the 1976 CIE L*a*b color space. Testing shall be

performed according to the requirements of ASTM Test

Method D4459-93.
Chassis Texture Front Bezel:N/A ; Back Cover:MT-11020
Molded Plastic Workmanship shall be inspected according to ViewSonic

Molded Plastic Parts Specification, VSCMPPSPEC001V1.2.
Screen Printed Parts, Bird Logo
Recess

Artwork shall be provided and confirmed by ViewSonic.

Rear Label A label identifying the product name, model/serial number

and FCC ID/Logo shall be placed into the rear label recess

located on the rear panel of the chassis.
Wall- Mount 400mmx200mm VESA high hole (n=6), M6 x 10mm, pitch

=1.0mm screw mounting kit not included.

Sample Sample of textured color chips, plastic material specification,

and Material Safety Data Sheets shall be submitted to

ViewSonic prior to Mass Production Release.

In addition, all exterior surfaces shall have uniform texture/color. The maximum acceptable
gap between the buckets to bezel plastic pieces shall be within 1.5 mm. The maximum

acceptable gap between LCD panel and bezel shall be within 2.5 mm.

8. Environmental

Operating Temperature 0°C to +40°C

Storage Temperature -20°C to +60°C

Operating Relative Humidity 65% non-condensing

Storage Relative Humidity 85% non-condensing

Operating Altitude 0 to +3,000 meters above sea level

Storage Altitude 0 to +12,000 meters above sea level

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3. Front Panel Function Control Description

Front View of the Product

1 2 3 4 5

6

87

Volume Down

Decrease sound volume or adjust a highlighted control while in OSD menu.

Volume Up

Increase sound volume or adjust a highlighted control while in OSD menu.

Menu

T

urn OSD menu ON/OFF.

CH Down

C

hannel down when source is at TV or select a control while in OSD menu.

CH Up

Channel up when source is at

TV or select a control while in OSD menu.

ENTER

T

o highlight a control in OSD menu.

Power ON/OFF button
Remote Control Receiver
Power LED Indicator

1

3

2

4

5

6

7

8

9

9

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Power (AC input)

Connect to LCD TV and AC outlet with the power cord.

HDMI Input Terminal

Connect this port to the HDMI output of A/V device.

VGA (15 pin) Signal Input

Connect this port to the VGA output of your PC.

YPbPr / HD Component Video Input

Connect the external video devices with component output to these jacks.

S-Video input

Connect other devices, such as DVD or VCD to this port.

Composite Video input

Connect other devices, such as DVD or VCD to this port.

PC Audio input

Connect this port to PC line out jack.

Audio Input for YPbPr Components

Connect external audio to this port (left/ right).

Audio Input for AV or S-Video Components

Connect external audio to this port (left/ right).

Audio output (left/right)

Connect external speaker into this jack.

RF Antenna / Cable TV Input

Connect to the antenna or cable service.

I

F

E

C

D

B

H

G

A

A

B

C

F

G

I

H

E

D

Rear View of the Product

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Remote Control

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ENGLISH

1 POWER Power ON/OFF

MTS MTS select

3

INFO Display current information

4

SOUND Select situation mode for sound

5

SLEEP TV Sleep timer setup

6

FREEZE “Freeze-Frame” the current screen

0~9 number button

Switch channel number keys

8

AVC

The tuner contains automatic volume control circuitry (AVC)
to prevent converter overload

9

VOL+ and VOL- Adjust volume up or down

UP/ DOWN /LEFT/ RIGHT/
ENTER

UP/ DOWN/ LEFT/ RIGHT: Select or adjust the function of
OSD
ENTER: Enter the function setting

INPUT Select input source

MUTE Volume mute ON/OFF

TV Swap between TV. Swap to TV when in other source

PICTURE Select situation mode for picture

WIDE Aspect ratio, used to select image size

RETURN Return to previous channel

PROGRAM UP/ DOWN Select up or down programs

MENU On Screen Display (OSD) menu ON/OFF

Remote control button function as follow

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ENGLISH

ADVANCED OPERATION—OSD MENU/ REMOTE CONTROL

Picture Menu — Adjusting the picture

It is active in TV/ AV/ S-VIDEO/ YPbPr/ HDMI source.

• Contrast: To adjust contrast of video.

• Brightness: To adjust luminance of video.

• Colour: To adjust colour.

• Tint: To adjust tint level.

• Sharpness: To adjust picture sharpness.

• Fresh Tone: To adjust colour of skin.

• Colour Temp.: To select the screen colour temperature between Normal, Warm, and Cool

.

• Reset: Press ENTER to reset all the settings in Picture page.

Sound Menu — To adjust sound

It is active in all input sources.

• Bass: To adjust the bass (It is only active when sound mode is in “User” condition).

• Treble: To adjust the treble (it is only active when sound mode is in “User” condition).

• Balance: To adjust left and right audio balance.

• Equalizer: To adjust the equalizer.

• Reset: Press ENTER to reset all the settings in Sound page.

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ENGLISH

Channel Menu — To setup for TV

It is only active in TV source.

• Auto Scan: To automatically preset the channels into TVs memory by pressing◄►. Kindly

suggest you auto scan all the channels before watching your TV for the fi rst time.

Note: Auto Scan will scan twice. First scan for PAL system, and second scan for SECAM
system. After auto scan all the channels, you need not to do it again when turning on your
TV next time.

*China TV system: PAL D/K

• Manual Store: The function is to give a minute search for possible existing channels and

store them in memory.

1. Press ◄ or ► to get into “Manual Store”.

2. Move the cursor to “Prog. No”, and select the desired channel position with ◄►.

3. Move your cursor to “Search”, and search the detectable channels with ◄►.

4. Move your cursor to “Fine Tune”, and adjust the picture with ◄►.

5. Move to Store, then store the instruction with ENTER.

Note: The channel will be stored instead of the former program.

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ENGLISH

Option Menu

When input source is TV/ AV/ S-VIDEO/
YPbPr/ HDMI (HDCP):

When input source is PC/ HDMI(PC):

• Main Source: To select the input source for main screen between TV, YPbPr, AV, S-Video,

PC, and HDMI with ◄►.

• H-Position: To adjust the horizontal position of the video with ◄►.

• V-Position: To adjust the vertical position of the video with ◄►.

• OSD Language: To select the OSD language between English, Simply Chinese and

Traditional Chinese with ◄►.

• Reset: Press ENTER to reset all the settings in Option page.
Note: When input source is PC/ HDMI(PC), the controls of H-Position and V-Position are
disabled.

PC Menu — to Adjust for PC

It is only active in PC and HDMI (support PC mode).
When input source is PC: When input source is HDMI(PC mode):

• Auto Adjust: Auto adjust picture’s horizontal position, vertical position, fi ne tune, and

H-Size with ◄►.

• Contrast: To adjust foreground luminance of video.

• Brightness: To adjust background luminance of video.

• H-Position: To adjust horizontal position of video.

• V-Position: To adjust vertical position of video.

• Clock: To adjust delay time of clock in order to reduce the noise of picture.

• Phase: To adjust delay time of phase in order to reduce the noise of picture.

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ENGLISH

1. Press ◄ or ► to get into Colour Mode.

2. Use ◄►to select between Normal, Warm, Cool, and User.

3. When select “User”, it allows you separately adjust the colour of red, green, and blue.

• Reset: Press ENTER to reset all the settings in PC page.
Note: When input source is HDMI(PC), the controls of H-Position, V-Position, Clock, and Phase are
disabled.

• Colour Mode: To adjust colour temperature.

OSD Menu — To setup OSD window

It is active in all input sources.

• H-Position: To adjust the OSD horizontal position with ◄►.

• V- Position: To adjust the OSD vertical position with ◄►.

• Duration: To automatically shut off the OSD after a preset period of time passed. Use ◄►

to preset the time from 5 to 60 seconds.

• Reset: Press ENTER to reset all the settings in OSD page.

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Video:

The MST96889LD is a high performance and full integrated IC for multi-function LCD
monitor/TV with resolution up to SXGA/WXGA. It is configured an integrated triple-ADC/PLL,
an integrated DVI/HDCP/HDMI receiver ,a multi-standard TV video and audio decoder,a video
de-interlacer,a scaling engine,the MSTARACE-3 color engine,an on-screen display controller,an
8 bit mcu and a built-in output panel interface.With external frame buffer,3-D video decoding and
processing are fulfilled for high-quality TV applications.to further reduces system costs,the
MST96889LD also integrates intelligent power management control capability for qreen-mode
requirment and spread-spectrum support for EMI management.

Audio:

This is a stereo fully digital audio amplifier with output power which can deliver up to 2 x 16 w
to 4ohm load with 12v supply voltage. Using SCL/SDA digital contral interface,AD8256A
provides sound processing functions including volume ,bass ,treble,EQ,Mixing and Dynamic
Range control.

TUNER FEATURES

Multi-standard TV Systems broadcast reception
Especially developed for LCD-TV/PDP application
New input configuration resurts in best-in-class noise
Figure : typically 5.5dB in UHF
True 5 v device
Full frequency range from 48.25MHz TO 863.25MHz
PLL controlled tuning
True synchronous vision IF demodulator
Ultra linear FM PLL demodulator
Demodulated video output,AF sound output,second IF sound output.
I2C-bus control 2

nd

IF address for pip application
Coplies with European regulations on radiation,signal handling and immunity
Coplies to CISPR13 including am end ment and amen dment
Low profilr horizontally mounted metal 70 mmhousing
Enviromentally friendly lead-free process used
Suitable for lead-free wave soldering

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4. Circuit Description

1. Function Test

1.1. Product

- 32” LCD TV

1.2. Test Equipment

-PC signal generator: CHROMA 2525 CARD ,CHROMA 2327 or 2329,Pioneer
DV-S969AVi.

-TV and Video signal generator.

-Color analyzer: MINOLTA CA210.

-Power meter: CP-310A or CP-320A.

-AC power supply transformer: 110V/120V ±10% 60Hz ±5%.

220V/240V±10% 50Hz ±5%.

-Digital ammeter

1.3. Test Condition

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.

1.4. Test Display Modes & Pattern

1.4.1 EEPROM INIT
A. Timing : 1280X1024@60Hz.
B. Pattern : Cross hatch.

C. Switch off the power and press the “▲” and “enter ” key simultaneously, and

switch on the power. At this time we can enter into the factory mode.

D. Select the “EEPROM INIT” item and press “enter”key to reset the EEPROM.

1.4.2 COLOR TEMPERATURE ADJUSTING
PC MODE:

A. Timing : 1280X1024@75Hz.
B. Pattern : 16 gray.
C. Set CA110 color analizer at the center of screen and along a perpendicular to the

screen at 20cm from the display.
D. Press menu key select the OSD page on INPUT SELECT and select MAIN:VGA.
E. Press menu key change the OSD page to adjust page.
F. Press “▼” key to select the “ WHITE BALANCE” item in the factory mode and

press “enter ”key, then the white balance will be auto dadjusted .
G. Color temperature verification :

USER x=0.283±0.015 y=0.297±0.015

1.4.3 Power Consumption Check ( VGA MODE )
A. TIMING: 1360 x 768@60Hz
B. Pattern: 1010UPRIGHTNESS PATTERN
C. BRIGHTNESS=MAX, CONTRAST=MAX.
D. The power that each MODE consumed is shown in Chart 1.

MODE

MAX POWER COMSUMED POWER LED COLOR

NORMAL

200W(max) for 32” BLUE

Stand-by

3W (max) RED

Chart 1

1.4.4 Check the position of the picture displayed and phase auto adjusting (VGA MODE).
Depend on the TIMING of TIMING TABLE (TABLE 3) to switch MODE in order,
stay about 10 seconds each MODE, it can changed and stored automatically each

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5. Adjusting Procedure

MODE. We can’t switch over to the next MODE until AUTO ADJUST disappears.

1.4.5 HDMI MODE FUNCTION TEST
A.DVI MODE: Depend on the TIMING of TIMING TABLE (TABLE 3 ) to check

MODE in order.

B.HDMI MODE: make sure the 480i, 480p, 720p, 1080i TIMING is right.

1.4.6 OSD FUNCTION TEST
A. Time: 1360x768@60Hz
B. Pattern: 16*12 pane
C. Make sure that Each FUNCTION has one right action.

1.4.7 YPbPr, S-VIDEO, AV, TV, DTV’S FUNCTION TEST

A. Input YPbPr, S-VIDEO, AV , TV, signal and check.
B. Input PAL D/K air channel (TABLE 1) for TV channel.

C.Under YPbPr MODE, Make sure the 408i, 480P, 720P, 1080i is right.

1.4.8 AUDIO FUNCTION TEST

A. Audio input includes PC AUDIO IN, S-VIDEO/AV AUDIO IN and YPbPr AUDIO

IN.

B. Under PC MODE, input PC AUDIO signal, checks whether the action of AUDIO IN

is right.

C. Under S-VIDEO/AV MODE, input L/R AUDIO signal, checks whether the action of

AUDIO IN is right.

D. Under YPbPr MODE, input L/R AUDIO signal, checks whether the action of

AUDIO IN is right.
E. Under HDMI MODE, checks whether the action of AUDIO IN is right.
F. AUDIO OUT FUNCTION TEST: Under all patterns except PC,HDMI,YPbPr pattern,

The Audio output meets active extra speaker, examines whether the extra speaker
makes the sound.

1.4.9 EARPHONE FUNCTION TEST
Under PC MODE, input PC AUDIO signal, determines whether the action of INT

SPEAKER output is right. Meets earphone with the EARPHONE, Determined whether
the action of EARPHONE output is normal.

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TV Frequency Table:

(TABLE 2)

CHINA Channel –PAL- D/K (VIF:38.0MHz , SIF:31.5MHz) (Unit：MHz)

CH Frequency

Range

Picture

fp

Sound

fs

Oscillation

f osc

CH Frequency

Range

Picture

fp

Sound

fs

Oscillation

f osc
1 48.5-56.5 49.75 56.25 87.75 Z-36 447-455 448,25 454,75 486.25
2 56.5-64.5 57.75 64.25 95.75 Z-37 455-463 456,25 462,75 494.25
3 64.5-72.5 65.75 72.25 103.75 13 470-478 471.25 477.75 509.25
4 76-84 77.25 83.75 115.25 14 478-486 479.25 485.75 517.25
5 84-92 85.25 91.75 123.25 15 486-494 487.25 493.75 525.25

Z-1 111-119 112.25 118.75 150.25 16 494-502 495.25 501.75 533.25
Z-2 119-127 120.25 126.75 158.25 17 502-510 503.25 509.75 541.25
Z-3 127-135 128.25 134.75 166.25 18 510-518 511.25 517.75 549.25
Z-4 135-143 136.25 142.75 174.25 19 518-526 519.25 525.75 557.25
Z-5 143-151 144.25 150.75 182.25 20 526-534 527.25 533.75 565.25
Z-6 151-159 152.25 158.75 190.25 21 534-542 535.25 541.75 573.25
Z-7 159-167 160.25 166.75 198.25 22 542-550 543.25 549.75 581.25

6 167-175 168.25 174.75 206.25 23 550-558 551.25 557.75 589.25
7 175-183 176.25 182.75 214.25 24 558-566 559.25 565.75 597.25
8 183-191 184.25 190.75 222.25 25 606-614 607.25 613.75 645.25
9 191-199 192.25 198.75 230.25 26 614-622 615.25 621.75 653.25

10 199-207 200.25 206.75 238.25 27 622-630 623.25 629.75 661.25
11 207-215 208.25 214.75 246.25 28 630-638 631.25 637.75 669.25

12 215-223 216.25 222.75 254.25 29 638-646 639.25 645.75 677.25
Z-8 223-231 224.25 230.75 262.25 30 646-654 647.25 653.75 685.25
Z-9 231-239 232.25 238.75 270.25 31 654-662 655.25 661.75 693.25

Z-10 239-247 240.25 246.75 278.25 32 662-670 663.25 669.75 701.25
Z-11 247-255 248.25 254.75 286.25 33 670-678 671.25 677.75 709.25
Z-12 255-263 256.25 262.75 294.25 34 678-686 679.25 685.75 717.25
Z-13 263-271 264.25 270.75 302.25 35 686-694 687.25 693.75 725.25
Z-14 271-279 272.25 278.75 310.25 36 694-702 695.25 701.75 733.25
Z-15 279-287 280.25 286.75 318.25 37 702-710 703.25 709.75 741.25
Z-16 287-295 288.25 294.75 326.25 38 710-718 711.25 717.75 749.25
Z-17 295-303 296.25 302.75 334.25 39 718-726 719.25 725.75 757.25
Z-18 303-311 304.25 310.75 342.25 40 726-734 727.25 733.75 765.25
Z-19 311-319 312.25 318.75 350.25 41 734-742 735.25 741.75 773.25
Z-20 319-327 320.25 326.75 358.25 42 742-750 743.25 749.75 781.25
Z-21 327-335 328.25 334.75 366.25 43 750-758 751.25 757.75 789.25
Z-22 335-343 336.25 342.75 374.25 44 758-766 759.25 765.75 797.25
Z-23 343-351 344.25 350.75 382.25 45 766-774 767.25 773.75 805.25
Z-24 351-359 352.25 358.75 390.25 46 774-782 775.25 781.75 813.25
Z-25 359-367 360.25 366.75 398.25 47 782-790 783.25 789.75 821.25
Z-26 367-375 368,25 374.75 406.25 48 790-798 791.25 797.75 829.25
Z-27 375-383 376,25 382.75 414.25 49 798-806 799.25 805.75 837.25
Z-28 383-391 384,25 390.75 422.25 50 806-814 807.25 813.75 845.25
Z-29 391399 392,25 398.75 430.25 51 814-822 815.25 821.75 853.25
Z-30 399-407 400,25 406.75 438.25 52 822-830 823.25 829.75 861.25
Z-31 407-415 408,25 414.75 446.25 53 830-838 831.25 837.75 869.25
Z-32 415-423 416,25 422.75 454.25 54 838-846 839.25 845.75 877.25
Z-33 423-431 424,25 430.75 462.25 55 846-854 847.25 853.75 885.25
Z-34 431-439 432,25 438.75 470.25 56 854-862 855.25 861.75 893.25
Z-35 439-447 440,25 446.75 478.25

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1.5. TV receiving test:

1.5.1 TV SIGNAL TEST ITEM

CENTRALISM TRANSMITTING SIGNAL CHECK CONTENT

SET CONTENT

CHANNEL

ORDER

FREQUENCY

(MHz)

PATTERN SOUND P/S(dB)

CHECK

CONTENT

P0(PAL I)

45.75 MONO SCOPE

FM Mono

(SWEEP TONE)

-5 ELECTRIC
ABNORMITY SOUND

P1(SECAM L)

55.75 COLOR BAR

Nicam Stereo*2

-10 SOUND ,PICTURE

P2(SECAM L)

160.00 MONO SCOPE

FM Mono*1

(400Hz)

-10 NOISE LIMITED
SENSITIVITY

P3(PAL D/K)

440.25 Full White 100% Nicam Dual -10 SOUND,PICTURE

P4(PAL B/G)

471.25 Dem

Nicam Stereo*2

-16 STEREO FUNCTION

P5(PAL I)

603.25 MULTIBURST Nicam Dual -10 DUAL FUNCTION

P6(PAL B/G)

855.25 Color Bar Nicam
Stereo*2

-10 SOUND,VIDEO

P7(PAL D/K)

863.25 MONO SCOPE FM MONO*1

(400Hz)

-10 NOISE LIMMITTED
SENSITIVITY

TV TEST METHOD

A.P0 Examines sound by ear, whether the sound does have mechanical resonation and the
electrical unusual sound, and image to sound disturbance.
B.P1and P6: Check sound and picture.
C.P2: Examines whether the sound does receive the image disturbance, Judgment basis: Whether
there is unusual sound, input signal LEVEL<=36dBu,and STEREO SENSITIVITY is normal.
D.P3: Under main/sub/main-sub mode, check sub function.
E.P4: Examines whether the sound does receive the image disturbance, Judgment basis: Whether
there is unusual sound.
F. P5:Check T1 of close-caption. Input signal level<=45dBu.
G.P7: Adjustment attenuator, If the critical point of the change of the image signal to noise ratio is
under LEVEL<=60dBu, regards as normally.

TIMING TABLE (FACTORY PRESET MODE) (TABLE 3)

ITEM

1 2 3 4

TIMING

640*480@60HZ 640 *480@75HZ 800 *600@60HZ 800*600@75HZ

Pixel Rate

25.175MHZ 31.500MHZ 40.000MHZ 49.500MHZ

H TOTAL

31.778us 26.667us 26.400us 21.333us

H DISPLAY

25.422us 20.317us 20.000us 16.162us

H B-Porch

1.907us 3.810us 2.200us 3.232us

H Width

3.813us 2.032us 3.200us 1.616us

H Border

0.318us 0.000us 0.000us 0.000us

V TOTAL

16.683ms 13.334ms 16.579ms 13.333ms

V DISPLAY

15.253ms 12.800ms 15.840ms 12.800ms

V B-Po rch

1.049ms 0.427ms 0.607ms 0.448ms

Vs Width

0.064ms 0.080ms 0.106ms 0.064ms

V Border

0.254ms 0.000ms 0.000ms 0.000ms

H/V Sync

-/- -/- +/+ +/+

Interlace

No. No. No. No.

ITEM

5 6 7 8

TIMING

1024 ×768 60HZ 1024 ×768 75HZ 1280 ×720 60HZ 1280 ×768 60HZ

Pixel Rate

65.000MHZ 78.750MHZ 74.250MHZ 65.000MHZ

H TOTAL

20.677us 16.660us 22.222us 20.677us

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H DISPLAY

15.754us 13.003us 17.239us 15.754us

H B-Porch

2.462us 2.235us 2.936us 2.462us

H Width

2.092us 1.219us 1.007us 2.092us

H Border

0.000us 0.000us 0.000us 0.000us

V TOTAL

16.666ms 13.328ms 16.667ms 16.666ms

V DISPLAY

15.880ms 12.795ms 16.000ms 15.880ms

V B-Po rch

0.600ms 0.466ms 0.444ms 0.600ms

Vs Width

0.124ms 0.050ms 0.111ms 0.124ms

V Border

0.000ms 0.000ms 0.000ms 0.000ms

H/V Sync

-/- +/+ -/- -/-

Interlace

No. No. No. No.

TIMING TABLE (FACTORY PRESET MODE) (TABLE 3)

ITEM

9 10 11 12

TIMING

1360 ×768 60HZ 1280 ×1024 60HZ

Pixel Rate

85.5MHZ 108MHZ

H TOTAL

20.959us 15.630us

H DISPLAY

15.906us 11.852us

H B-Porch

2.994us 2.296us

H Width

1.310us 1.037us

H Border

0.000us 0.000us

V TOTAL

16.662ms 16.661ms

V DISPLAY

16.097ms 16.005ms

V B-Po rch

0.377ms 0.594ms

Vs Width

0.126ms 0.047ms

V Border

0.00ms 0.00ms

H/V Sync

+/+ +/+

Interlace

No. No.

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