Norcent LT2022 SERIES Manuale utente

NORCENT LT2022

LCD TV MONITOR

LT2022 SERIES

THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY

REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL;

WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE

OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR

OMISSIONS.

NORCENT LT2022

Table of Contents

Table of Contents ….....................................................................................…………...….. 2

1. Specifications ….......................................................................................…………...….. 3

1.1 General Specifications ………………………………………………………………………………. 3

1.2 LCD TV Description ................................................................................................................. 4

1.3 Interface Connectors ........................................................................................………….....…. 4

2. Adjustment........................................................................……………...…………………. 5

2.1 Use of the Remote Control.....................................................................................………….... 5

2.2 Use of the Menus ..................................................................................................………….... 6

2.2.1 Front Panel Control Knobs.........................................................………………………………..……... 6

2.2.2 To Use The Menus………..………………………………………………………………………………… 6

3. Trouble Shooting Chart................................................................……………………..... 10

4. White-Balance, Luminance Adjustment…………………………………………………... 14

5. Software Flow Chart…………………………………………………………………………... 15

6. BOM …………………………………………………………………………………………..…. 17

7. PCB Layout ..……………………..………………………...........................……………...… 39

7.1 Main Board PCB Layout.……………………………………....……………...…………………….. 39

7.2 Power Board PCB Layout………………………………………...……………...………………….. 41

8. Block Diagram ........................................................………………...……………………... 43

8.1 Main Board…………………………………………….. ……...……………...……………...……… 43

8.2 Power Board……………………………………..………...……………...……………...……….….. 44

9. Schematic Diagram …................................................................…….........…………….. 45

9.1 Main Board Schematic Diagram………………...…………...……………...……………………. 45

9.2 Power Board Schematic Diagram…………...…………...……………...………………………… 59

NORCENT LT2022

1. Specifications

1.1 General Specifications

Items Specification

Screen Size 20” TFT-LCD Panel

Aspect Ratio 4:3

Resolution 640 x 480 (VGA)

Display Area (opening) H x V 408mm x 306mm

Pixel Pitch 0.212mm x 0.637mm

Display colors 16.7 million

Contrast Ratio 500:1

Brightness 500cd / m²

Viewing Angle 160°(Horizontal)/140°(Vertical)

Response Time 16ms

Lamp Type/Life 60000 hr

LCD Panel

Color Temperature Cool

TV Tuning System NTSC 181 Channel with Electronic PLL Tuner

Sound System MTS / SAP

Closed Caption, V-chip Yes

TV Function

Color System NTSC

AV1 RCA x 1 Audio L/R x 1

RCA x 1

AV2

S-Video x 1

Audio L/R x 1

(Share)

Video Inputs

Component YPbPr x 1 Audio L/R x 1

Speaker (built-in): Two 5 watt speakers

Headphone Mini-jack for stereo (3.5ø)

Audio Output Audio Output: L / R

Line Output (RCA L/R)

OSD language English / French / Spanish

Table Stand Included

Wall Mount VESA 100 x 100 mm

Power Supply AC100V~240V, 50/60Hz

Power

Power Consumption <70W

Operating Temp. + 0°C ~ + 40°C

Storage Temp. - 25°C ~ + 60°C

Environment

Operating Humidity. 10 % ~ 85 %

Panel Tilt Forwards/Backwards/ Rotation -5° / +20° / ±30°

Dimension W x H x D (with stand) 696 x 443 x 261 (mm)

Weight (net) Kg (w/o Accessories) 9 Kg

Accessories Remote Controller, Batteries (x2), AC Power Cord, User’s Manual

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1.2 LCD TV Description

The LCD TV will contain a main board (include audio), a switching power board (include an inverter board), an

IR board, a Headphone jack board and a function keyboard. The main board and power board will house the

flat panel to control logic I2C bus, DDC, brightness control logic for LCD panel, DC-DC conversion to supply the

appropriate power to the whole board and transmitting TTL level signals into LCD Module to drive the LCD

display circuit.

The inverter board will drive the 6CCFLs (Cold Cathode Fluorescent Tube).

The function keyboard and Remote Control will provide the OSD control signal to the Main Board.

Apply power to the display by turning the power switch to the "ON" position and allow about ten seconds for

panel warm-up. The Power-On indicator lights "ORANGE" when the display is on.

With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness

and contrast to the most pleasing display, or press auto-adjust to get the best picture-quality.

If your TV requires service, it must be returned with the power cord.

1.3 Interface Connectors

(A) AC Power: TV rear side

(B) TV Signal: TV rear side

(D) Composite Video: TV rear side, RCA female

(E) Composite Video: TV rear side, RCA female

(F) Audio: TV rear side, RCA female (Red/White), right channel/ left channel for Composite Video/ S-Video/

Component Video.

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2. Adjustment

2.1 Use of the Remote Control

POWER:

Press to turn on/off the TV. The

TV is never completely powered

off unless it is physically

unplugged.

0~9/100 Digit buttons

To select a TV channel.

MTS

Press this key to activate

Multichannel Television

Sound, Stereo or Mono

sound.

SLEEP

With this key you can set a time

period after which the TV

should switch itself to standby.

Press the key repeatedly to

select the number of minutes.

This counter runs from 0, 30,

60, 90, 120 minutes. The timer

begins to count down from the

numbers of minutes selected

after the display has

disappeared.

Not supported. (for the

model with this function

only)

MUTE

Temporarily interrupt the

sound or restore it.

DISPLAY

Press this button to Display

Channel number on the

right-top corner.

Press ▲or▼to brows

through the TV channels

which are not erased. To

view a blocked channel, use

the digit buttons to access

PRE-CH

Display the previously

selected TV channel.

TV/VIDEO

Select your input source:

press repeatedly to select TV,

AV1, AV2, S-VIDEO or

COMPONENT VIDEO mode,

according to where you

connected your external

source.

 AV1/AV2 for a VCR

connected to the AV

connectors of the TV.

 S-VIDEO for a S-Video

VCR connected to the S-

VIDEO connector of the

TV.

 COMPONENT for a

DVD/DTV Set Top Box or

another component video

device connected to Y, Pb,

Pr and to the AV AUDIO

inputs L and R.

CAPTION

Press this button to turn

Closed Caption on.

Be sure you have selected

Caption On in the Setup

menu.

Press repeatedly to

dis

OSD menu.

V-CHIP

Press this button to

setu

arental control.

SWAP

Not Supported. (for

the model with this

function only)

SIZE

Not Supported. (for the

model with this function onl

POP

Not Supported. (for the

model with this function

only)

VOL

Press + or – to adjust the

volume.

PIP

Not Supported. (for the

model with this function

only)

NORCENT LT2022

2.2 use of the menus

2.2.1 Front Panel Control Knobs

Power Key: Press to turn on or off the TV.

MENU Key: Press to show the OSD menu and exit OSD menu at the TV.

Down / Up Key: Press to perform select function and channel.

- / + Key: Press to confirm your function selection and adjustment.

Source Key: Press to select your input source.

2.2.2 To Use the Menus

1. Press the MENU button to display each menu

2. Use the cursor up/down to select a menu item.

3. Use the cursor left/right to enter a submenu or enable/disable the function.

4. Press the MENU button to exit the menu.

MAIN MENU

Press the MENU button to enter the main OSD (On Screen Display). Adjust items include VIDEO ADJUST,

AUDIO ADJUST, CLOSED CAPTION, V-CHIP, SLEEP TIMER and SET UP

VIDEO ADJUST

1. Contrast, Brightness and Saturation are adjusted from 0 to 100.

2. Tint is adjusted from 0 to 100.

3. Black Level is adjusted from 0 to 100.

4. Sharpness is adjusted from 0 to 10.

You can adjust picture contrast, brightness, color, tint and sharpness to the levels you prefer.

NORCENT LT2022

5. Reset is set up to default value.

When adjust any item sub-OSD will show up like this

AUDIO ADJUST

1. Volume is adjusted from 0 to 100.

2. Bass and Treble are adjusted from 0 to 100.

3. W-Head Phone (optional) is the function for wireless headphone enable or disable.

You can adjust audio Volume, Balance, Bass and Treble to the levels you prefer.

When adjust any item sub-OSD will show up like this.

CLOSED CAPTION

It’s allows you to read the dialog of television programs on the TV screen. Designed to help the hearing impaired,

this feature uses on screen “text boxes” to show dialogue and conversations while the TV program is in progress.

Captions will appear on the screen only during captioned broadcasts.

Remark: the captions do not always use correct spelling and grammar.

Not all TV programs and product commercials are made for broadcast with Closed Caption information included.

Refer to your area’s TV program listings for the TV channels and times of closed Caption shows. The captioned

programs are usually noted in the TV listings with service Marks such as “CC”.

Caption Mode:

Dialogue (and descriptions) for the action on the captioned TV program shows on screen. Usually CH1 is the most

used channel. CH2 may be used for alternate languages if they are being transmitted.

Text Mode:

Often used for channel guide, schedules, bulletin board information for Closed Caption programs, news, weather

NORCENT LT2022

information or stock marker reports. Not all Closed Caption modes are necessarily being use by a TV channel

during the transmission of a Closed Caption program.

V-CHIP SETUP

Select V-Chip on OSD then enter 4 digits of pin number.

 Initial pin number is “0000”.

 If you enter an incorrect pin number “Incorrect” message will be displayed.

It is the parental control function (V-chip). It is used to block program viewing based on the ratings by the

broadcaster. The default setting is to allow all programs to be viewed. Viewing can be blocked by the type of

program and by the categories chosen be blocked. It is also possible to block all program viewing for a time period.

A. There are two item could be defined. One is TV Guidelines another one is Movie Guidelines.

B. Setting up TV Guidelines

 Use Up/Down arrow buttons to move around the matrix and press Right arrow button to change the

value form “U” to “B” or ”B” to ”U”

 U: Unblock

B: Block

C. Setting up Movie Guidelines

 Use Up/Down arrow buttons to move around the matrix and press Right arrow button to change the

value from “U” to ‘B” or “B” to “U”

NORCENT LT2022

D. CHANGE PIN (personal identification number) is needed for changing password to control V-chip setup.

Process as follows:

1) Enter old pin code

2) Enter new pin code

3) Confirm new pin by entering new pin one more time.

SLEEP TIMER

It is for set a time period after which the TV should switch itself to standby. The counter runs from 0 > 30 > 60 > 90

> 120 minutes.

The timer begins to count down from the number of minutes selected after the display has disappeared.

Note: To view the remaining time, press the SLEEP button once. To cancel the sleep time, repeatedly press the

SLEEP button until… appears. If you turn the TV off after setting the sleep time, the setting will be erased. Set it

again.

SETUP

1. Blue screen for when no video input screen will be blue or blank. If it’s ON, the screen will be in blue. If it’s

OFF, the screen will be blank. Preset is ON.

2. Language for different language OSD MENU includes English / French / Spanish. Preset is English.

3. AIR/CATV/HRC/IRC for different TV input solution, RF and cable.

4. CH Search is for auto memorizes all receiving channels of air TV or CATV programs.

5. CH DEL. /ADD.is for add “ ” or delete “ “ the current channel for memorizes.

6. RESET is set up to default value.

NORCENT LT2022

3. Trouble Shooting Chart

Defect Mode Failure Analysis Repair Testing

Completed

Next Step

Missing Line

Bright Dot

Dark Dot

Light Leakage

Mura

Image Sticking

Dot Defect

Brightness Spot

Dot Defect

Particle

Check Panel Panel Chan

No display Check Power Board

Check Main board

Check Panel Change Panel

Change Main board

Change Power Board

Check Keyboard Change Keyboard

Check Line Connected

Power board and Minored Change Wires

Noise Check Main board

Check Panel

Change Main board

Change Panel

Abnormal

Display

Indice

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