ViewSonic N3235w-1M, VS11770-1M Service Manual

Service Manual

ViewSonic N3235w-1M

Model No. VS11770-1M

32” LCD TV

(N3235w-1M_SM Rev. 1a Jun. 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 06/01/07 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.......................................................................................23

5. Adjustment Procedure................................................................................27

6. Trouble Shooting Flow Chart................................................................ .....54

7. Block Diagram.............................................................................................58

8. Schematic Diagrams....................................................................................59

9. PCB Layout Diagrams.................................................................................72

10. Exploded Diagram And Exploded Parts List...........................................80

11. Recommend Spare Parts List...................................................................83

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

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. 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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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”

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 31.5” diagonal; 697.68 (H) x 392.25 (V) mm.
Pixel Pitch 0.51075(H) × 0.51075(V) mm
Viewing Angle

H = +/- 88°, V = +/- 88° with CR≥10 (Typical)
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 1.3 (Max), measured per panel spec.
Chromaticity (CIE1931) White-x:0.285,White-y:0.293 (Standard Mode Only)
Colors 16.7M (8-bit)
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 (see 7.1 General Test Equipment) 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 “Samsung DTVS205CH201A” for NTSC/ATSC. The
following table defines this tuner specification.

Parameter Specification

RF Input Level 45 ~ 85dBµV

RF Tuning Range

NTSC: 55.25 to 801.25 MHz, 2-69 Channels for

Off-Air and 2-125 Channels for CATV
RF Tuner Sensitivity (S/N Ratio at un-weight) 45 dB (min.)
Channel Bandwidth NTSC/ATSC: 6 MHz Maximum

0.7(min.)–1.1(max.) V

CVBS Characteristics:
Video Amplitude Signal
DC Level Sync Pulse Typical. 0.35 V
Audio Characteristics:
AF Output Level Measured via LP 20 kHz
Filter, RMS Decoder,
75us De-emphasis
THD
S/N

Typical. 0.35Vrms

10% (max.)

44 dB (min.)
Compatible system TUNER NTSC/ATSC
Compatible system AV NTSC M

2. Specification

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

Y : 1.0Vp-p W / Neg. Sync (IN 75 Ω )

C : 0.285Vp-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 Vp-p(IN 75 Ω),Pr:0.7 Vp-p(IN 75 Ω)

Video Bandwidth NTSC: 6 MHz Maximum
HDMI Characteristics Panel Link T.M.D.S HDMI-1.1
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 .
“MTK” MT5371 for N3235w-M shall be used as sound processor. 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

10 W x 2 at 10% T.H.D
Distortion

10W x 2 at 10% T.H.D. Distortion

Speaker Impedance main spk :6 Ω6 main spk :6 Ω6

Line In Per Tuner Spec

500 mV rms (Typ)

1.6 V rms (Max)

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) 40dB(400Hz to 20 kHz)

4. Electrical

The following table defines the electrical specification of this product.

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

Input Frequency Range 47-63 Hz

Input Current 3.0A @ 115VAC // 1.5A @ 230VAC

Power Supply Inrush

Max in < 150A (with fully loaded power supply) at 230Vac
Shall not result in

p

ermanent failure of power supply (including blown

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fuse)

Power Consumption:
Normal

Normal: 180 W (Max) // Stand by: < 3 W

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 FCC.
Power Supply Transient
Immunity
(Supply Transients and
Outage)

Able to withstand an ANSI / IEEE C62.41 – 1980 2000V ring wave

with no damage.

Surge Immunity Test

Able to withstand 1.25X nominal Line Voltage for one cycle with no

damage.
Power Supply Missing
Cycle Immunity

Function properly without reset or visible screen artifact when 1/3 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 >= 80% @ full load, nominal line

Leakage Current <0.5mA @ 240VAC

Power Saving(DPMS) < 3 W (only for VGA source)

Recovery Time < 3 sec.

Power Factor Correction Compliant with EN61000-3-2

5. Firmware & OSD

The product firmware of VS11770-1M shall have a firmware version of V:P01 or later version.
Any changes/revisions afterward shall also be pre-approved by ViewSonic in written. For
VS11770-1M, its firmware shall have a built-in frequency table for NTSC/ATSC off-air
TV/CATV, Closed-Caption, and with MTS implementation.

All audio/video and other output adjustments shall be performed by using an On Screen Display
(OSD) via a Remote Control Unit (RCU) adjustment. The following tables list the OSD
functions supported by VS11770-1M.

OSD

Picture Mode Picture effect selections on Cinema, Sport, Vivid, Hi-bright, and User

Brightness Adjust the Black levels
Contrast Adjust the White levels
Color Adjust the Color levels
Tint Adjust the Tint levels
Sharpness Adjust the Sharpness levels
Color Temperature Selections on Normal, Warm, user, Cold
Balance Adjust the Speak output levels
Bass Adjust the Low Frequency levels
Treble Adjust the Hi Frequency levels
Surround Surround sound effect On or Off
Reverb Reverb Sound effect selections on Concert, Living Room, Hall, Bathroom,

Cave, Arena, Church, and Off the effect

Equalizer Equalizer effect selections on Rock, POP, Live, Dance, Techno, Classic, Soft,

and Off the sound effect.
SPDIF Type SPDIF output selections on PCM, Dolby Digital and Off the output.
Auto Volume Control Auto set the same sound level between different TV channels.
Tuner Mode Selections TV sources to Air or Cable
Auto Scan TV program Auto Search
Channel Skip TV channel Add or Delete
MTS TV Audio Selection on Mono, Stereo and Sap sound

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Audio Language Audio Language Selections on English, Spanish, and French

OSD Language OSD Menu Language Selections on English, Spanish, and French

Aspect ratio Selections the Image Size on Full, Letterbox, zoom, Panorama, No scale,

Normal
Blue Mute Blue Display On or Off when no input signal
Time setup Set Time Zone, Time, Sleep Timer, and Auto Sleep
Close Caption Displaying captions during closed caption source and closed caption mode

select
Memory recall Set user settings to factory preset value
Parental TV program controlled by parents via password setting

RCU Key function

Power Soft power on or off
Picture Picture effect selections on Cinema, Sport, Vivid, Hi-bright, and User
Sound Reverb Sound effect selections on Concert, Living Room, Hall, Bathroom,

Cave, Arena, Church, and Off the effect
TV/CATV Swap Air TV and Cable TV. Swap to TV when in other source
MTS Selection on Mono, Stereo and Sap sound
Sleep Set TV Power off time
Info Display current source input information
Mute Mute On or Off sound
0 ~ 9, - Direct channel key number
Return Return to last channel
Guide Electric program guide on Digital TV
CH up/down Adjust channel up or channel down
Volume Adjust the Volume levels
Up/Down/Left/Right
arrows

Select or adjust the function of OSD

Fav.ch Switch to favorite channel
Fav.A/D Add or Del favorite channel
Menu Turn On or Off OSD main menu or exit current menu
Input Selections Input Source
Freeze To freeze the current image
Zoom Enlarge or shrink current image on the screen
Wide Adjust image size on Full, Letter Box, Zoom, Panorama, No scale, Normal

Enter Confirm the selection

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)

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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=632.6mm and D=210mm

W=800mm, H=573.5mm and D=117.6 mm
Net Weight 17kg, 37.4 lb.
Gross Weight 21.3kg, 46.9 lb.
Net weight *without* stand 15.41kg, 33.97 lb.
Chassis Plastic Material ABS (ABS HB / ABS VO / PC+ABS/HIPS+MICA)
External Plastic Chassis
Components

N/A

Exterior Chassis
Color/Texture/Details

Refer to N3235WM Product ID

Chassis Component’s Color
Difference

Refer to N3235WM 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.
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

Humidity 0 ~ 65% non-condensing

Altitude 0 meter to +3000 meters above sea level

Storage Temperature

-20°C to +60°C

Humidity 0 ~ 90% non-condensing

Altitude 0 meter 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

7 8 9

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

Channel down when source is

TV, or select a control while in OSD menu.

CH Up

Channel up when source is

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

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Rear View of the Product

SPDIF Optical output

Connect this port to the SPDIF input of A/V device.

Cable/Air input jack

Connect this port to RF/ CATV/ Digital cable.

Audio output

Connect this port to your A/V device with audio in (RCA) connectors or to audio amplifier.

AV/ S-Video signal Audio input (left/right)

Connect this port to the RCA audio output connectors of your A/V device.

YPbPr signal Audio input (left/right)

Connect this port to the RCA audio output connectors of your A/V device.

Composite Video input

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

S-Video input

Connect this port to the S-Video output of A/V device.

YPbPr signal input

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

PC Audio input

Connect this port to PC line out jack.

VGA signal input

Connect this port to the VGA output of your PC.

Headphone Jack

Connect this port to your headphone.

HDMI Input Terminal

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

Power (AC input)

Using power cord provided, connect to a power source.

I

F

E

C

D

B

H

G

A

I

H

F

G

A

B
C

E

D

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Remote Control

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ENGLISH

1 POWER Power ON/OFF

2

MTS Select Mono, Stereo or SAP sound

3

INFO Display current information

4

SOUND Select sound modes

5

SLEEP Set timer to turn off TV

6

FREEZE “Freeze-Frame” the current screen

7

ZOOM Adjust window size

8

0~9, - number button Directly channel select

9

VOL+ and VOL- Adjust volume UP/DOWN

10

GUIDE Show electronic program guide (EPG)

11

FAV.A/D To skip or restore Favorite Channels

12

UP/ DOWN/ LEFT/ RIGHT/
ENTER button

UP/ DOWN for OSD function select and LEFT/ RIGHT
for function adjust
ENTER: Enter the function setting

13

INPUT Input source select

14

MUTE Volume mute ON/OFF

15

TV/CATV Swap between TV/CATV

16

PICTURE Select picture modes

17

WIDE Change the image size

18

RETURN Return to previous channel

19

CH▲ and CH▼ Adjust Channel UP/DOWN

20

FAV.CH Select from preset Favorite Channels

21

MENU On Screen Display (OSD) menu ON/OFF

Remote control button function as follow

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ENGLISH

Video Menu — To adjust the picture quality

In TV, AV, S-Video, YPbPr, HDMI source:

•

Picture Mode: To select picture mode between User, Cinema, Sport, Vivid, and Hi-Bright.

•

Brightness: To adjust luminance of video. (right: Max, left: Min.)

•

Contrast: To adjust contrast of video. (right: Max, left: Min.)

•

Color: To adjust color. (right: brilliant color, left: pale color.)

•

Tint: To adjust tint level. (right: greenish tone, left: reddish tone.)

•

Sharpness: To adjust picture sharpness. (right: sharper, left: softer.)

ADVANCED OPERATION — OSD MENU

OSD Functions

In VGA source:

Note: When in AV, S-Video, YPbPr or HDMI source,the TV option on the left does not appear.

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ENGLISH

Audio Menu — To set the audio quality and status

In TV source:

•

Color Temperature: Press ENTER to select color temperature from User, Cool, Normal,
and Warm.

When Color Temperature is selected to User, the R, G, B Gain level can be adjusted
separately.

•

Auto Adjust: Press ENTER to auto adjust picture’s horizontal position, vertical position,
fine tune and H-Size.

•

VGA: Press ENTER to adjust VGA setting.

＊

H. Position: To adjust the horizontal position of the picture.

＊

V. Position: To adjust the vertical position of the picture.

＊

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

＊

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

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ENGLISH

In AV, S-Video, YPbPr, HDMI, VGA source:

•

Balance: To adjust left and right audio balance.

•

Bass: To adjust bass.

•

Treble: To adjust the treble.

•

Surround: To enjoy a concert hall effect, select “On” when stereo is playing.

•

Reverb: To enjoy the reverb sound effect of Concert, Living Room, Hall, Bathroom, Cave,
Arena, or Church.

•

Equalizer: To select equalizer modes from Rock, POP, Live, Dance, Techno, Classic, Soft.

•

SPDIF Type: To select SPDIF Type from Dolby Digital, PCM, or Off.

•

Auto Volume control: To turn On or Off Auto Volume control. (This function is only effective
in TV source.)

TV Menu — To set up for TV

It is only active in TV source.

•

Tuner Mode: To select Cable or Air as the TV source. Select “Cable” if you want to watch
Cable TV channels, and select Air to watch Air TV channels.

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ENGLISH

•

Channel Skip: Press ENTER to skip the channel. To restore the channel, press ENTER
again.

•

Auto Scan: To auto scan the TV and DTV channels. Press ENTER to start auto scanning
Air and Cable TV channels. Press

MENU again at any time to interrupt scanning.

•

MTS: To select audio mode from Mono, Stereo, or SAP when available.

•

Audio Language: To select audio language from English, Spanish, or French.

Setup Menu — To set up OSD window

In TV, AV, S-Video, YPbPr, HDMI source:

Note: When in AV, S-Video, YPbPr or HDMI source,the TV option on the left does not appear.

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ENGLISH

In VGA source:

•

OSD Language: To select an OSD language from English, Spanish or French.

•

Aspect Ratio: To select image size between No scale, Normal, Full, Letterbox, Zoom, and
Panorama.

•

Blue Mute: To set the background color to blue when there is no signal.

•

Time Setup: To set Time Zone, Time, Sleep Timer, and Auto Sleep.

＊

Time Zone: To select the time zone appropriate to your location.

＊

Time:

To set the current time.

Auto Synchronization: When “Auto Synchronization” is enabled, the date and time will
be automatically synchronized according to the program content.
Timer: To set power-on and power-off time.

＊

Sleep Timer: To set the off timer from 10~120 minutes.

＊

Auto Sleep: To set the off timer for longer intervals -- 1 hour, 2 hours, or 5 hours.

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ENGLISH

•

Close Caption: To set close caption options.

＊

Analog Close Caption: To set basic analog closed caption options. (CC1~CC4,
TEXT1~TEXT4, Off)

＊

Digital Close Caption: To select closed caption signal formats and set up caption
modes for digital TV channels. (Service1~6, Off)

＊

Digital Caption Style: Press ◄► to select Caption Style from “As Broadcaster” or
“Custom”. When “Custom” is selected, use ▲▼ to select the desired controls, ◄► to
adjust detailed settings.

Font Size: To select a font size from Large, Small, or Medium.
Font Color: To select a font color from Black, White, Green, Blue, Red, Cyan, Yellow, or

Magenta.

Font Opacity: To select font opacity from Solid, Translucent, or Transparent.
Background Color: To select background color.
Background Opacity: To select background opacity.
Window Color: To select window color.
Window Opacity: To select window opacity.

＊

•

Memory Recall: To restore the factory default settings.

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ENGLISH

Parental Menu — To set up Parental Control options

It is active in all input sources; however, when in AV, S-Video, YPbPr, HDMI, or VGA
source, the TV option on the left does not appear.

Enter password and the screen below will show. (The default password is 0000.)

•

Channel Block: To block channels. Use ▲▼ to select the channel you want to block, and
then press ENTER to block or unblock it.

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ENGLISH

•

Program Block: To set TV and Movie Ratings.

＊

Rating Enable: Choose “On” to enable the below settings.

＊

U.S. TV Ratings: To adjust TV blocking level in the US. You can select between TV-Y,
TV-Y7, TV-G, TV-PG, TV-14, or TV-MA.

＊

U.S. Movie Ratings: To adjust movie blocking level in the US. You can select between G,
PG, PG-13, R, NC-17, or X.

The TV Ratings in the US are defined as following.

Use ENTER button to block or unblock the ratings, and use MENU to exit.

TV-Y All children TV-PG Parental guidance suggested

TV-Y7 Directed to older children: this

program is designed for children
age 7 and above

TV-14 Parents strongly cautioned: this

program contains some material
that is unsuitable for children
under 14 years of age

TV-G General audience TV-MA Mature audience only

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ENGLISH

＊

The Canadian English Ratings are defined as following.

Use ENTER button to block or unblock the ratings, and use MENU to exit.

＊

Canadian English Ratings: To adjust blocking level in English-speaking region of
Canada. You can select between C, C8+, G, PG, 14+, 18+.

＊

Canadian French Ratings: To adjust blocking level in French-speaking region of
Canada. You can select between G, 8 ans +, 13 ans +, 16 ans +, 18 ans +.

The Canadian French Ratings are defined as following.

Use ENTER button to block or unblock the ratings, and use MENU to exit.

＊

Block Unrated: To block unrated movie or TV programs.

The movie Ratings in the US are defined as following.

Use ENTER button to block or unblock the ratings, and use MENU to exit.

G General audience R Restricted

PG Parental guidance suggested NC-17 No one 17 and under limited

PG-13 Parents strongly cautioned X Adult audience only

C Children PG Parental guidance

C8+ Children eight years and older 14+ Viewers 14 years and older

G General programming, suitable for

all audiences

18+

Adult programming

G General 16 ans + Not appropriate for children of

less than 16 years

8 ans + Children eight years and older 18 ans + Reserved to adults

13 ans + Not appropriate for children of less

than 13 years

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ENGLISH

•

Input Block: To set the input source to be blocked. Users will not be able to watch the
content coming from the blocked input source.

Use ENTER button to block the input source, and press ENTER again to unblock.

•

Change Password: To change the password, press ENTER, and the following screen
appears.

Enter the new password from the remote control, and then enter the new password again
to confirm.

Note:

Please make sure you remember your new password after changing, because you

cannot recall the default setting of the password by any selection.

•

Clear All: To clear all the locks set before, press ENTER, and then select “OK” to confirm.

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4. Circuit Description

A. Analog Switch and Video input.

The MT5371 is a complete backend hardware and software solution. It consists of a DTV
backend decoder and a TV controller and combines a transport de-multiplexer, a high
definition MPEG-2 video decoder, an AC3 audio decoder, an LVDS transmitter, and an
NTSC/PAL/SECAM video decoder with a 3D comb filter.

On-chip advanced motion adaptive de-interlacer (MDDi™) generates very smooth picture

quality for motions.

A 3D comb filter added to the video decoder recovers great detail for still pictures. The special
color processing technology provides natural colors and true studio quality graphics.

Analog switch is built in MT5371 and accept CVBS, YPbPr, S-Video, RGB signal directly to
internal video front end. For most system application, there is no need to add external

components to add analog video multiplexer on board.

The video ADC sample analog input signals. After ADC, all signal processing is digital

domain. The source select multiplex all inputs from digital and analog video ports and route
them into Main data path.

B. 3D comb filter, Video Decoder, Deinterlacer and Scaling controller.

MT5371 includes 3D comb filter TV decoder to retrieve the best image from popular
composite signals. Embedded HDTV/VGA decoders let the high bandwidth input signals
perfectly reproduced. 8 bits digital port may accept all kinds of external digital input video
source. New advanced motion adaptive de-interlacer converts accordingly the interlace video
into progressive one with overlay of a 2D Graphic processor. Advanced full function color
processing with fully 10-bit path provides h ig h quality video contents. Independent two
Flexible scalers provide wide adoption to various LCD panels for two of different video
sources at the same time. MT5371 supports alpha blending for Video and two OSD planes. It
also supports 10bit gamma correction and advanced ditheri ng processi ng for LC D display with
6/8/10 bit output.

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C. DTV and HDMI.

MT5112 is a fully integrated single-chip 8-VSB and 64/256-QAM demodulator. The chip is

designed specifically for the digital terrestrial HDTV and CATV receivers

. MT5112 includes a

10-bit A/D converter, 8-VSB/QAM demodulator, TCM (Trellis-Coded modulation) decoder,

and Reed- Solomon Forward Error Correction decoder. Moreover, an internal controller
handles the acquisition and tracking to ensure the best receiving performance.

The internal controller communicates with the external host controller via the I2C-compatible
interface, and also provides direct control to the RF tuner via the second I2C-compatible
interface.

MT5112 accepts either the direct IF signals and the IF signals are sampled by a 10-bit A/D
converter. Afterward, the digitized samples are further processed for adjacent channel

interference rejection. MT5112 measures the power level of the digitized sequence, and feeds
the control voltages back to the RF tuner and the IF amplifier respectively. The control
voltages are converted to analog signals through the on-chip 1-bit sigma-delta D/A converters
plus the off-chip R-C low-pass filters. The automatic gain control keeps the received power
level at a desired level and maximizes the received SNR.

The MT5371 includes a DTV Backend Decoder SOC which support flexible transport demux,

HD MPEG-2 video decoder, JPEG decoder, MPEG1,2, MP3, AC3 audio decoder.
It incorporates a processor for system control. The processor issues instructions to control the
peripheral via I²C. DDR

SDRAM is externally connected to the MT5371, the unified memory

allows all internal decoders can share data, which reduces external memory types and

capacities.

MT5371 is also including a fully HDMI-compliant receiver that fits directly into home theater

products such as LCD TVs, plasma TVs and HDTVs. The receiver is capable of supporting

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bandwidths up to 150 MHz and video resolutions up to 1080p and WXGA.

The built-in High-bandwidth Digital Content Protection (HDCP) decryption engine secures the
digital link for transmission of valuable high-definition video and audio. Built-in HDCP

self-test engine simplifies manufacturing testing.

HDMI Transmitter will pull high HDMI_PLUG_POWER (pin 18 in connector) when the cable

is connected. LCD Controller will pull high HDMI_HPD (pin 19 in connector) to info the
HDMI transmitter that the receiver is ready. The HDMI transmitter sends the video & audio to
MT5371 via 3 Data TMDS pairs & 1 CLOCK TMDS pairs.

M T537x

ATSC+NTSC
Combo Tu ner

MT 5112
(Demod.)

HDMI
Connector

HDCP
EEPROM

CVBS / SIF

DDR
SDRAM

DDR
SDRAM

Flash

LCD Module

System
EEPROM

D. Audio

When the Antenna receive the analog TV signal and modulate it to the CVBS signal which can
be recognized by the video decoder and SIF audio signal output to the sound decoder in the
MT5371.

When the Antenna receive the digital TV signal, RF signal will be converted to IF signals and
the IF signals will be modulated to the transport bitstream by MT5112. The MT5371 receives
bitstream input in TS format, and then separates the TS into audio and video PES, analyzing the

PES header, and transferring the PES to the audio and video decoders.

The MT8291 is a highly integrated stereo audio CODEC. The MT8291 performs stereo
analog-to-digital and two digital-to-analog conversions with single-ended analog voltage input
and output. It’s up to 24-bit serial values at sample rates up to 192 kHz. A 7:1 stereo input
multiplexer and an auto matic level control are included.

The three analog audio sources are put into MT8291 which first select the sources and do the
stereo analog-to-digital conversion with single-ended analog voltage input Sampled data is
transmitted through the serial audio interface at various rates from 32 kHz to 192 kHz.

The serial audio signals that coming from MT8291 are put into MT5371 for DSP and audio

effect processing. The serial audio signals output from MT5371 go into the MT8291 for doing
digital-to-analog conversion and then put analog audio signals into the IC YDA138. Two DAC
outputs from MT8291 reach 2Vrms in a 12V supply environment including a headphone, two
left/right line outputs with volume gain/attenuation from -127 dB to +12 dB and digital

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de-emphasis function.

The IC YDA138 is a class-D amplifier that can be output power of 10Watts per channel on a

6-ohm load speaker when using a 12V power supply operation.

PC/DVI Audio(mini jack)

AV/SV Audio(RCAR/L)

MT8291
(Audio Codec)

YPbPr Audio(RCAR/L)

MT5371

I2S

YDA138
(Audio Amp.)

Speaker

HeadPhone

I2S

ATSC+NTSC
Combo Tuner

MT5112

SIF

TS

CVBS

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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 CA110.

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

-AC power supply transformer: 110V/120V ±20% 60Hz ±5%.

-Digital ammeter

1.3. Test Condition

Before function test and alignment, each LCD TV 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, and 16 grey scale,
(c) With cycled display modes.

1.4. Test Display Modes & Pattern

1.4.1 EEPROM INIT
A. Timing: 1366*768@60Hz
B. Pattern: 16*12 pane
C. Press ‘POWER’, ‘▲’and ‘ENTER’ at the same time, then go into the FACTORY

MODE.

Fig. 1 Fig. 2

D. Figure 1,Select EEPROM INITIAL and press ENTER. The act of EEPROM

INITIAL is completed when EEPROM INIT disappeared.

1.4.2 COLOR TEMPERATURE ADJUSTING
PC MODE:

A. Timing: 1360*768@60Hz.
B. Pattern: 16 grey scale.
C. LCD TV should be run-in and warmed up for at least 30 minutes.
D. Make sure the distance between SENOR of the CA110 and the LCD TV is about

20cm.

E. Color Temperature adjusting.

1.Fig. 1: under the picture 16 grey scale of VGA source, select WHITE
BALANCE and press ENTER, The color warm will auto adjust. The act of EHITE
BALANCEL is completed when the picture is steady.

2.After adjusting, switch to FULL WHITE and check the value of each color.
Preset color for N3235WM

x=0.283±0.015 y=0.298±0.015

3.Under the picture NTSC color bar of YPbPr source, select WHITE BALANCE

and press ENTER, The color warm will auto adjust. The act of EHITE
BALANCEL is completed when EHITE BALANCEL disappeared.

4.After adjusting, switch to FULL WHITE and check the value of each color.

5. Adjusting Procedure

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