Cover.p65 LT 2240 2220 40 3020 50 Service Manual

User Manual: LT-2240

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MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.

9351 Jeronimo Road, Irvine, CA 92618-1904

CAUTION:

Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and

"PRODUCT SAFETY NOTICE" contained in this manual.

MITSUBISHI ELECTRIC

Service

Manual

2003-2004

SPECIFICATIONS

LIQUID CRYSTAL DISPLAY TELEVISION

• Power : [LT-2220, LT-2240] AC ADAPTOR

In - AC 120V, 60Hz; Out - 20VDC 6.0A

: [LT-3020, LT-3040, LT-3050] 120V, 60Hz, 2.2A

• LCD Panel : Resolution - 1280X768

: Pixel Pitch - [LT-2220, LT-2240] 0.375mm

[LT-3020, LT-3040, LT-3050] 0.5025mm

• Analog Inputs : VHF/UHF 75Ω unbalanced

: Two A/V Inputs (Composite or S-Video)

L-R Audio

: Two Component Video Inputs (480i/480p/

720p/1080i) L-R Audio

: PC Input - 60Hz (VGA,S-VGA,XGA,W-XGA)

: PC Audio - 3.5mm Mini-Jack

•Digital Input : MonitorLink™/DVI (Video Sources Only)

L-R Audio (Analog)

: MonitorLink™ Control/RS-232C

•Audio Outputs : L-R Audio Output (Fixed/Variable)

: Headphone Jack (Variable) 3.5mm

• Tuning : NTSC 181Channel Analog Cable

• Frequency Range : VHF 54 ~ 470MHz

UHF 470 ~ 806MHz

• Speakers : [LT-2220, LT-2240]

Left & Right (2 X 2.3W) Sub (3.4W)

: [LT-3020, LT-3040, LT-3050]

Left & Right (2 X 3.5W) Sub (6W)

LT-2220

LT-2240

LT-3020

LT-3040

LT-3050

• Weight and dimensions shown are approximate.

• Design specifications are subject to change without notice.

With Stand: Height Width Depth Weight

[LT-22XX] 20-1/4" 22-3/4" 11-7/8" 36.6 lbs

[LT-30XX] 25-3/8" 29-3/4" 11-7/8" 54.3 lbs

W/O Stand: Height Width Depth Weight

[LT-22XX] 18-5/8" 22-3/4" 4" 19.8 lbs

[LT-30XX] 23-1/4" 29-3/4" 5" 37.5 lbs

• Weight / Cabinet Dimensions

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 3

INTRODUCTION .................................................................................................................................. 5

PRODUCT SAFETY NOTICE ............................................................................................................... 5

SAFETY PRECAUTIONS ..................................................................................................................... 5

DISASSEMBLY

LT-22XX ............................................................................................................................................. 7

LT-30XX ........................................................................................................................................... 13

ELECTRICAL ADJUSTMENTS

Initial Setup .................................................................................................................................... 21

CIRCUIT EXPLANATIONS & BLOCK DIAGRAMS

Circuit Explanations ....................................................................................................................... 23

Block Diagrams.............................................................................................................................. 29

TEST POINT LOCATIONS AND DESCRIPTIONS

PWB-SET Test Point Locations and Description ............................................................................ 33

PWB-MAIN Test Point Locations and Description .......................................................................... 35

TROUBLESHOOTING

LT-22XX Power Troubleshooting ...................................................................................................... 37

LT-30XX Power Troubleshooting ...................................................................................................... 39

Video Troubleshooting .................................................................................................................... 41

Audio Troubleshooting .................................................................................................................... 51

Remote Control & Front Switch Troubleshooting ............................................................................ 53

REPLACEMENT PARTS

Replacement Parts List .................................................................................................................. 55

INTERCONNECT WIRING DIAGRAM

CONTENTS

Page 4

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 5

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in television receivers have special safety related characteristics. These

characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be

obtained by using replacement components rated for higher voltage, wattage, etc.

Replacement parts which have special safety characteristics are identified in this service manual.

The replacement for any safety part should be identical in value and characteristics.

SAFETY PRECAUTIONS

NOTICE: Observe all cautions and safety related notes located inside the receiver cabinet and on the

receiver chassis.

WARNING:

1. Operation of this receiver outside the cabinet or with the cover removed presents a shock hazard

from the receiver's power supplies. Work on the receiver should not be attempted by anyone who is

not thoroughly familiar with the precautions necessary when working on high voltage equipment.

2. Do not install, remove or handle the LCD panel in any manner unless shatterproof goggles are

worn. People not so equipped should be kept away while the panel is being handled. Keep

the panel away from the body while handling.

3. When service is required, observe the original lead dress. Where a short-circuit has occurred, replace

those components that indicate evidence of overheating.

Leakage current check

Before returning the receiver to the customer, leakage current should be measured using following methods.

1. Cold Check

With the alternating current (AC) plug removed from the AC source, place a jumper across the two AC plug

prongs. Connect one lead of an ohm meter to the AC plug and touch the other lead to each exposed metal part

(i.e. antennas, handle bracket, metal cabinet, screw heads, metal overlay, control shafts, etc.), particularly any

exposed metal part that has a return path to the chassis. The resistance of the exposed metal parts having a

return path to the chassis should be a minimum of 1Mega Ohm. Any resistance below this value indicates

an abnormal condition and requires corrective action.

2. Hot Check ...Use the circuit shown below to perform the hot check test.

1. Keep switch S1 open and connect the receiver to the measuring circuit. Immediately after

connection, and with the switching devices of the receiver in their operating positions, measure

the leakage current for both positions of switch S2.

2. Close switch S1, energizing the receiver. Immediately after closing switch S1, and with the

switching devices of the receiver in their operating positions, measure the leakage current for both

positions of switch S2. Repeat the current measurements of items 1 and 2 after the receiver has

reached thermal stabilization. The leakage current must not exceed 0.5 milliampere (mA).

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 6

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 7

Remove the screws and components in the quantities indicated.

Reassemble in reverse order.

DISASSEMBLY PROCEDURE (LT-22XX)

1. COVER, REAR 2. STAND UNIT

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 8

3. BACK UNIT

4. BACK COVER

DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 9

5. PWB-SET

6. PWB-MAIN

DISASSEMBLY PROCEDURE (LT-22XX0) CONTINUED

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 10

7. CHASSIS BASE

DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 11

8. LCD

9. PANEL

DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 12

WIRING HARNESS LOCATIONS

DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 13

DISASSEMBLY PROCEDURE (LT-30XX)

Remove the screws and components in the quantities indicated.

Reassemble in reverse order.

1. COVER, REAR

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 14

DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED

3. BACK COVER

2. STAND UNIT

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 15

DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED

5. BRACKET, VESA

4. UNIT SPEAKER

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 16

DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED

6. SHIELD, POWER & SHIELD, CASE

7. COVER, TERMINAL, LEFT & RIGHT

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 17

DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED

8. ASSY-PWB-MAIN/ASSY-PWB-SET/UNIT-POWER

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 18

DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED

9. CHASSIS, REAR

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 19

DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED

10. BRACKET T/B/LCD PANEL

11. BEZEL

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 20

DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED

WIRING HARNESS LOCATIONS

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 21

Initial Setup

A. Option Menu Setup

Follow the steps below for the initial set-up:

1. Select the "MENU" display by pressing the "MENU" button once.

2. Press the number buttons "2", "0", "7", "0" in sequence to select the "OPTION MENU" display.

3. Press the "ADJUSTpq" buttons to select "INITIAL."

4. Press "ENTER."

NOTE: At this time channel 3 is automatically selected and all Menu and Audio/Video user setting are set

to the defaults shown in the chart below.

B. Default Settings

MENU-2-0-7-0

OPTION MENU

Initial

Power Restore :OFF

DTV Port :Auto

Direct Key Mode :OFF

Memorize channels

ANT-A - Air

V-Chip Start Time 12:00AM TV Speakers (Internal) On

Language (idioma) English V-Chip Stop Time 12:00AM Audio Output Variable

Front Button Lock Off Lock by Time Off AUDIO SETTINGS

Lock Time N/A Bass 31

Clock Setting Manual Unlock Time N/A Treble 31

Clock Time - - : - - - - Balance 31

Set Day Sunday Video Mute On Sub-Woofer Level 31

Black Enhancement On Surround Off

Closed Captions On if Mute PC Power Save On TV Listen To Stereo

CC Background Gray Level Sound Off

Timer Off VIDEO SETTINGS

Antenna ANT-A Set Time - - : - - - - Contrast 31

Channel 3Set Day Sunday Brightness 31

Memory Deleted Sharpness 31

Name N/A Auto Color Correction Off Color 31

SQV N/A Tint 31

Magenta 31 Color Temp High

V-Chip Off Red 31 Video Noise Standard

TV Rating TV-PG Yellow 31 Film Mode (Auto) On

FV- Fantasy Violence Allow Green 31 Back Light 63

D-Sexual Dialog Allow Cyan 31 PC/DVI H-Position 31

L-Adult Language Allow Blue 31 PC/DVI V-Position 31

S-Sexual Situations Allow PC Video Clock 31

V-Violence Allow PC Fine Detail 31

Programs Not Rated Allow PC H-Resolution 31

Movie Rating PG PC V-Resolution 31

ADVANCED FEATURES

TIMER

COLOR BALANCE

CAPTIONS

CHANNEL EDIT

V-CHIP-LOCK

MANUAL COLOR ADJUST

AUDIO/VIDEO

MAIN MENU DEFAULT SETTINGS

SETUP

CLOCK

V-CHIP LOCK By Time

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 22

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Circuit Explanations

1. Video circuits

This section explains the video circuitry of models LT-2220/LT3020. Both models have almost the same

circuits. The explanation corresponds to the various inputs (PC, TV, VIDEO, Component, DVI).

The HD input has realized high definition with the resolution of WXGA.

(Refer to the LT-2220 / LT-3020 Video block diagram, for the flow of video signals.)

1-1. Video input circuit

1-1-1. PC Input video circuit

For PC input, video is inputted into IC400 of the signal processing IC via the following IC’s.

(A) IC2A3 : Analog-to-digital conversion IC (AD9883AKST-110 : Analog devices)

The video signal (R, G, B) of PC input is changed into a digital signal (8 bits each) from an analog

signal. Besides digital conversion, this IC has the functions below:

- Contrast adjustment for PC

- brightness adjustment for PC

This IC is controlled by register control of IC 2A3 via 3.3V IIC-bus.

(B) IC2A2 : Inverting IC with Schmidt trigger (74LCX14 : Fairchild)

Input IC for Horizontal and Vertical sync signals from the PC input.

In case of noise on the leading and trailing edges or low amplitude of the sync signals outputted from a

PC, it is necessary to modify the waveform.

Improper waveforms are corrected by this IC in the following manner.

- Noise on the leading/trailing edge : Rise-time and fall-time is carried out early.

- Waveform is noisy : False triggering prevented by the Schmidt circuit.

- Low Amplitude : If voltage threshold is satisfied, it will output at 3.3V.

Since the IC is an inverter, it will let it pass twice and has united polarity.

1-1-2. Component and DVI Input circuit.

For Component and DVI inputs, video is inputted into IC400, signal processing IC, via the following IC’s.

(C)IC204 : Analog-switch IC (BA7657 : Rohm)

In this IC, one of the 2 component signal inputs (Y, Cb, Cr) is chosen by the select signal. Select

signal CTL is controlled by the MCU.

Page 23

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

(D)IC2J1 : TMDS receiver IC with HDCP (Sii907B : SiliconImage)

In this IC, the input signal is processed based on EIA-861A. Inputs from a TMDS-Interface are

converted into a RGB analog signal. HDCP and HDTV resolutions are supported.

When no DVI signal is input, it changes to standby mode automatically and power consumption is

lowered. The LCD panel specification is for input signals whose vertical sync signal is 60Hz. The

outputs of this IC include separate horizontal and vertical sync signals.

(E)IC201 : Analog-switch IC with LPF (SM5301A : NPC)

In this IC, the component signal (Y, Cb, Cr) from IC204 or DVI signal (R,G,B) from IC2J1 is chosen

by the select signal and outputted.

Select signal MUXSEL is controlled by the MCU.

(F) IC202 : Sync separate IC (LM1881M : National Semiconductor)

Used for Component input.

This IC separates the composite H and V sync signal from the composite video signal

The composite sync signal is sent to IC203 (Sync select IC).

(G) IC203 : Sync select IC (HD74LV157: Hitachi)

In this IC, the composite sync signal from IC202(for component) or Separate sync signal from

IC2J1(for DVI) is chosen by the select signal and outputted.

Select signal MUXSEL is controlled by the MCU.

The output from this IC is sent to IC400 (Signal processor IC) in order to remove the

vertical sync signal and output the separated horizontal sync signal. The horizontal sync signal is

then routed to IC205 (Analog-to-digital conversion IC).

(H) IC205 : Analog-to-digital conversion IC (AD9883AKST-110 : Analog devices)

The Component video (YCbCr / RGB) or DVI inut is converted into a digital signal (8 bits

each) from an analog signal. Besides digital conversion this IC performs the following:

- Contrast adjustment for Component or DVI

- brightness adjustment for Component or DVI

This IC is controlled by register control of IC 205 via 3.3V IIC-bus.

This IC’s output is sent to IC500.

Page 24

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

(I) IC500 : Interlace-to-Progressive conversion IC ( gm6015 : Genesis)

This IC performs the following functions to all input signals except the PC input.

- Motion adaptive De-interlacer for SD (480i) signals.

- Scaling

- PIP / POP control for AV input combinations.

- Color / tint control

- 3 dimension Noise reduction.

- Adaptive Film mode

- Sync Separation for Composite sync.(for component only)

A format change to the input signal is also made by this IC.

Control is performed in 5-line serial communication from the MCU.

1-1-3. VIDEO and TV input circuitry

For VIDEO and TV inputs, the signal is applied to IC400, signal processing IC, via the following ICs.

(J)IC701 : Analog-switch IC (CXA2089 : SONY)

In this IC, the composite signal (CVBS) from video1/2 input or composite signal (S-video) from

video1/2 input is chosen by register control of IC 701 via 5V IIC-bus.

(K)IC702 : Buffer IC with LPF ( MM1566AF : Mitsumi)

IC701 reduces the high frequency noise ingredient of the video signal.

(L)IC100 : Analog-switch IC (CXA2069 : SONY)

In this IC, the composite signal (CVBS / S-video) from the video1/2 inputs or the composite signal

(CVBS) from the TV input is selected by register control of IC 100 via 5V IIC-bus.

It is also selected and sent to IC300 for CCD use.

(M)IC601 : Digital decoder IC with 3D Y/C separation (uPC64011 : NEC)

This IC converts the analog video signal (S-VIDEO/CVBS) from IC100 into a digital signal.

Besides digital conversion this IC also has the following functions.

- 3 dimension Y/C separation for CVBS

- Contrast adjustment.

- Brightness adjustment.

- FIELD signal generation.

- PLL (Phase-Locked Loop) : referential clock generation.

- Sync signal generation

This IC is controlled by register control of IC 601 via 3.3V IIC-bus.

This IC’s output is sent to IC400.

(The output format is YPbPr and WXGA. Thw Vertical frequency is 60Hz.)

Page 25

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

1-2. Signal processor circuit

(N)IC400 : Signal processor IC ( M66473FP : Mitsubishi)

This IC has the functions below.

- Scaling for PC

- PIP/POP control for PC and AV combination

- Picture enhancement

- Auto setup for PC

- Colorsync function

- Frequency measurement / distinction

- Sync separation for component CS

- Color space conversion ( YPbPr à RGB )

- Gamma correction

This IC is controlled by register control of IC 400 via 5-lines serial communication.

This IC’s output is sent to IC4A0.

(The output format is RGB and WXGA, and Vertical frequency is 60Hz.)

(O)IC4A0 : OSD mixing IC ( M66617FP : Mitsubishi)

This IC combines the picture signal outputted from IC400, the OSD signal outputted from the

MCU and the signal detected by CCD.

V-CHIP function is also controlled by this IC.

This IC is controlled by register control of IC 4A0 via serial communication.

The IC’s output is sent to IC4A1.

1-3. Output signal circuit

(P)IC4A1 : LVDS transmitter IC ( THC63LVDM83R : Thine)

This IC converts 28bits of TTL/CMOS data into LVDS data stream.

In 28 bits, 24-bits digital video signal, horizontal sync signal, vertical sync signal, an enable

signal and a clock signal for the LCD panel are included.

A phase-locked transmit clock is transmitted in parallel with the data streams over a fifth LVDS link.

This IC’s output is sent to the LCD panel.

Page 26

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

2. Audio circuits

The audio circuits and speaker system of LT-22XX/LT30XX basically have the same circuits, except the Vcc

applied to the audio amplifier is different.

The specifications are as follows.

- High Power (LT-22XX : 8W ,LT-30XX: 12W)

- 2.1ch Sub woofer speaker system

- Impedance : 8 +/-1.2 ohms ( LT-22XX / LT-30XX )

- Compact and high performance sound enclosure box.

- Minimization of vibration noise

Refer to the LT-22XX / LT-30XX Audio block diagram.

2-1 Audio input mixing circuits

The audio input block consist of 2 AV-SW, IC701(CXA2089) on SUB-PWB and IC100(CXA2069) on

MAIN-PWB. Audio inputs for VIDEO1 and VIDEO2 are connected to IC701. Other external audio Inputs

(Component1/2 and DVI and PC) are connected to IC100. Their output is connected to IC710 (Audio

Processor : MSP3440G ) of Scart1 / Scrat2 input port.

TV broadcasting audio(SIF) is also connected to IC710’s IF Input port. Input sources are selected by register

control of IC 701/IC100/IC710 via 5V IIC-bus.

2-2 Audio processor IC

MSP3440G is used as the main audio processor.

This IC’s functions are as follows.

- De modulator (SAP/Stereo)

- Sub-woofer output

- Volume control

- Tone control

- Surround

- L/R mixing

- Audio line output

Both models have the following audio controls on the users menu: Bass, Treble, Balance, Surround, Listen

to, Level Sound, Sub Woofer, Audio Out Fixed/Variable.

Audio adjustment of all controls except volume is performed by this IC.

(Refer to the “Owner’s guide” for a full explanation of each control.)

2-3 Audio amplifiers and speakers

These models use 2pcs of 2-CH BTL type audio amplifier AN7522.

One piece is for main audio, and one more piece is for the sub-woofer.

Amplifier +B voltage and the input circuits are slightly different by model. ( Refer to table 1).

Page 27

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Table 1: Amp supply voltage(+B)

LT-22XX LT-30XX

AMPVCC(for main) 7.5V 9V

SAMPVCC(for Sub Woofer) 9V 12V

Volume control is controlled by fading Volume1 /Volume2 DC signal to the amplifier Pin(#9).

Although the audio signals outputted from amplifier is sent to the SPEAKER, between the amplifier and

SPEAKER is a headphone terminal. If a headphone is connected, the audio signal to SPEAKER will be

interrupted and the audio signal will be sent to the headphone terminal.

3. Power circuit

Refer the LT-2220 / LT-3020 Power circuit block for the following.

The LT-2220 power supply is supplied from an AC adapter.

The LT-3020 power supply is supplied from a power supply board.

The LT-2220 has one connector for the inverter connection, the LT-3020 has two connectors.

Except for that, the circuit composition of the power supply is almost the same.

There are power supplies that are “always on” and “ON/OFF” with a control signal, as follows.

Power source

signal Voltage [V ] “always on” or

“ON/OFF” Control

signal Note

20V 20 always on - “22 only

24V 24 ON/OFF ON_24V “30 only

8.5V 8.5 always on - “30 only

A12V 12 ON/OFF Psave2

A9V 9 ON/OFF Psave2

A8V 8 always on -

AMPVCC “30 : 9

“22 :7.5 ON/OFF Psave3

SAMPVCC “30 : 12

“22 :9 ON/OFF Psave3

S5V 5 always on -

SW5V 5 ON/OFF Psave1

A30V 30 ON/OFF Psave1

S3.3V 3.3 always on -

4.5V 4.5 always on -

D3.3V 3.3 ON/OFF Psave1

A3.3V 3.3 ON/OFF Psave1

AD3.3V 3.3 always on -

D1.9V 1.9 ON/OFF Psave1

D2.5V 2.5 ON/OFF Psave1

1.5V 1.5 ON/OFF Psave1

Page 28

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

IC400

URANUS

SCALER

PiP/PoP

3.3V

1.9V

IC100

AV SW

CXA2069

add=92H

IC500

gm6015

3D-I/P

PiP/PoP

3.3V

2.5V

CVBS

IC204

BA7657

IC205

AD9883A

A/D

3.3V

add=9AH

IC2A3

AD9883A

A/D(PC)

3.3V

add=98H

24bit

Port 0

Port 1

Y for CCD2

CCDMAIN

BLOCK DIAGRAM of LT-22XX/LT-30XX(except Power)

IC401

16M

SDRAM

IC4A0

M66617FP

OSD MIX

ENMA?

3.3V

2.5V

IC701

AV SW

CXA2089

add=90H

IC710

MSP3440

Audio

Processor

add=80H

TV MPX IC712

AMP

AN7522

IC4A1

LVDS

3.3V

PC_DDC

IC2A1

DDC_EEP

3.3V

PC_H,VIC2A2

74LCX14

3.3V

IC300

CPU M306V7

3.3V

IC501

64M

SDRAM

IC202

SYNC SEP

LM1881M

IC2J1

SiI907B

TMDS

HDCP

3.3V

MonLink

IC8X0

RS322

ADM3311

3.3V

IC711

AMP

AN7522

Woofer

IC601

16M

SDRAM

H,V,DE,CLK

OSD-MIX

H,V,CLK/RST

PDWN

CCIR601

H,V,DE,CLK

R,G,B

H,V,DE,CLK

Field

R,G,B

H,V,CLK

14.318

MHz5BUS

IC601

UPD64011

3D-YC

DECODER

3.3V/1.5V

add=B8H

3.3V IIC

H,V,DE,CLK

R,G,B

Y,Cb/

Pb,Cr/Pr

18.432

MHz

5V IIC

IC201

SM5301

CVBS/Y/C

RSTB

SYNC

H,V,CLK

24.576

MHz

MUXSEL

CTL

BUS

TU IIC

3.3V IIC

IC305

OPAMP

LMV324

Volume 1/2

VRF

IC490

20MHz

PC_H,V

RESETQ

SWLED

Analog RGB

YPbPr/

YCbCrIC203

74LV157

3.3V

DVI H,V

RESET/PSAVE1

SW LR2

SW LR1

PWB-

SET(SUB)

CVBS/SY/SC

CCDSUB

IC2J2

E-DDC

3.3V

LCD Panel

PC_H,V

MPX

BUS

5V IIC

YUV/R,G,B

IC702

MM1566AF

BUFFER

SYNC

COMPOSIT_H2

MAIN

L/R Out

Sub

Woofer

Out

Input 1

J703 AUDIO L/R

Input 1

J704 S-Video

CVBS

Input 2

J701 AUDIO L/R

Input 2

J702 S-Video

Audio

Out

J705

Head

Phone

J706

J2A1

(Dsub15)

Component1

J201

Conponent 1

(VIDEO)

Conponent 2

(VIDEO)

DVI HD

(J2J0)

PC AUDIO

J103 L/R

DVI AUDIO

J102

Conponent

AUDIO

J201

L/R

Component 2 L/R

Component 1 L/R

TU1A0

TUNER

30V

add=C0H

CCD_Main

CCD_Sub

Analog RGB

MUXSEL

VRF/CTL

PC_DDC

Psave 1/2/3

Reset/RSB

RESETQ

3.3V IIC

5V IIC

TU IIC

16bit24bit

16MHz

IC303

64K EEP

3.3V

IC301

RESET M51957

3.3V

Page 29

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

POWER CIRCUIT BLOCK DIAGRAM FOR LT-22XX / LT30XX

20V "22 Only 5A

Adaptor SEB150P2

JP JP

"22 "22

OnlyOnly

24V (1) "30 Only 3A "22: 3A "30: 2.8A (2.5A) INVERTER

PWB-POWER (2.7A) TO INVERTER

ON_24V

24V (2) "30 Only 3.8A "30: 2.8A (2.5A) INVERTER "30 Only

PWB-POWER (3.5A) TO INVERTER

ON_24V LCD PANEL

"30: 0.9A

A12V IC860 "22: 0.8A A12V

PQ1CY1032Z TO MAIN

PSAVE2

A9V IC8K0 0.15A IC701 AV-SW CXA2089

BA178M09FP

A9V IC100 AV-SW CXA2069

TO MAIN TC1A0 TUNER 115VF045AR

"22 Only A8V IC8J0 0.015A IC710 MPX MSP3440G

BA178M08FP

"30 Only

"30: 9V 1.4A

AMPVCC IC870 "22: 7.5V 1.2A IC712 MAIN AMP AN7522F

PQ1CY1032Z

PSAVE3 "30: 12V 0.95A

SAMPVCCIC880 "22: 9V 0.6A IC711 SUB AMP AN7522F

PQ1CY1032Z

PSAVE3

8.5V "30 Only 1.2A S5V IC850 0.6A S5V IC300 MPU M306V7

PWB-POWER PQ1CY1032Z TO MAIN IC2A1 EEPROM 24LC21TSW

IC710 MPX MSP3440G

SW5V IC8E0 0.4A IC702 MM 1556AF

CPH6311

PSAVE1

: Power source is IC305 LMV324MTX

always ON A5V IC201 AV-SW SM5301A

: use several TO MAIN IC204 AV-SW BA7657F

power sources TC1A0 TUNER 115VF045AR

IC202 LM1881MX

A30V IC180 0.005A TC1A0 TUNER 115VF045AR

LA7995M

S3.3V IC8F0 0.05A IC8X0 ADM3311EARS

SI3033LSA

IC300 MPU M306V7

S3.3V IC301 RESET IC M51957

TO MAIN IC303 EEPROM 24LC64T-I

IC2A2 74LCX14

4.5V IC840 1.2A D3.3V IC8N0 0.5A D3.3V IC400 Scaler Uranus M66473FP

PQ1CY1032Z SI3033LSA TO MAIN IC500 3D I/P gm6015

PSAVE1 IC501 DRAM64 K4S643232F-TC60

IC401 DRAM16 IC42S1600-7T *2

IC602 DRAM16 IC42S1600-7T *2

IC601 3D Y/C UPD64011

IC4A0 ENMA M66617FP

IC4A1 LVDS THC63LVDM83R

IC4A4 74LCX74MTCX

IC4A2 74LCX04MTCX

IC490 DSO751SV 20MHz

D1.9V IC402 0.27A IC400 Scaler Uranus M66473FP

SI3018KS

PSAVE1

A3.3V IC8M0 0.04A A3.3V IC601 3D Y/C UPD64011

SI3033LSA TO MAIN IC203 HD74LV157

PSAVE1

AD3.3V IC8Y0 0.24A AD3.3V IC205 A/D AD9883

SI3033LSA TO MAIN IC2A3 A/D AD9883

IC2J1 DVI SiI907B

D2.5V IC830 0.8A D2.5V IC500 3D I/P gm6015

PQ1CY1032Z TO MAIN IC4A0 ENMA2 M66617FP

PSAVE1

1.5V IC600 0.06A IC601 3D Y/C UPD64011

SI3012KS

DEVICE IC

PWB-SET(SUB)

PWB-MAIN

POWER-UNIT

"30 Only

AC-Adaptor "22

Only

Page 30

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

IC400

M66473FP

(URANUS)

- Scaler for PC

- PiP/PoP control for

PC and AV combination

- Picture Enhancement

- Auto Setup

- Colorsync adjustment

- Sync Separation

for component CS

- Gamma

IC100

AV SW( CXA2069 )

IC500

gm6015

- Motion adaptive

De- interlacer

- PiP/PoP control for

AV input Combination

- Color / Tint adjustment

-3D Noise Reduction

-Scaler for AV Input

-Sync Separation for

Composite Sync

CVBS

IC204

BA7657

AV-SWIC205

AD9883A

ADC(for COMP/DVI)

Black level / contrast

control for

Component / DVI

IC2A3

AD9883A

ADC(for PC)

Black level / contrast

control for PC

OSD Mix

between

IC300

Y for CCD2

CCDMAIN

PC& Video BLOCK DIAGRAM for LT-22XX/LT-30XX

IC401

16M SDRAM

IC4A0

M66617FP

(ENMA II)

- OSD MIX

IC701(AV SW)

CXA2089

IC4A1 LVDS Tx

PC_H,VIC2A2

74LCX14

IC501

64M SDRAM

IC202

SYNC SEP

LM1881M

IC2J1

SiI907B

- TMDS-Rx

- HDCP Dec

- DAC

IC601

16M SDRAM

14.318MHz

IC601

uPD64011

-3D-YC

-DECODER

-Black level / contrast

control for TV /VIDEO

input

IC201

AV-SW

-LPF

CVBS/

SVideo

24.576MHz

MUXSEL

CTL

VRF

IC490

20MHz

Analog

RGB

YPbPr/

YCbCr

IC203

sync SW

74LV157

CCDSUB

PC_H,V

IC702

MM1566AF

BUFFER

Input 1

J703

Input 1

J704 S-Video

CVBS

Input 2

J701

Input 2

J702 S-Video

J2A1

(Dsub15)

Component1/2

J201

YpbPr/

YCbCr

MONITOR-

LINK

(J2J0)

TU1A0

TUNER

30V

add=C0H

Analog RGB

TMDS

Conponent 2

Conponent 1

CVBS/

SVideo

YUV16

YUV/RGB24

H/V/CLK/FIELD

H/V/CLK

IC300

(M602V7)

YCbCr/

YPbPr

WXGA60

480i

480i/480p/720p/1080i

VGA/SVGA/XGA/WXGA

H/V/CLK

RGB

H/V/CLK

Field

Port1Port0

RGB

WXGA60

H/V/CLK

RGB

WXGA60

H/V/CLK

LPF

YPbPr/

RGB

DVI HV

DVI H/V

Composite Sync

Composite H

Composite H2

HS_out

3.3V IIC

5V IIC

CPU Bus

Vcc=D3.3V/D2.5V

Vcc=D3.3V/1.9V

Vcc=D3.3V

Vcc=D3.3V/D2.5VVcc=AD3.3V

Vcc=AD3.3V

Vcc=A5V

Vcc=S3.3V

Vcc=A9V

Vcc=A5V

Vcc=A9VVcc=A3.3V/A1.5V/D1.5

Vcc=D3.3V

Vcc=A3.3V

Digital Circuit

Analog

Page 31

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

IC305

AUDIO Bloc k Diagram for LT-22XX/LT-30XX

IC100

AV-SW

CXA2069

IC701

AV-SW

CXA2089

Component 1

Audio

(J201)

Component 2

Audio

(J201)

DVI-AUDIO

(J102)

PC-AUDIO

(J103)

VIDEO 1

VIDEO 2

IC710 MSP3440g

MPX

from TU1A0

SIF output

IC711

AN7522

IC712

AN7522

MAIN Out

Woofer out

Speaker -L

Input

source

Select

ADC

Main Audio

Processor

Core

-De modulator

-Volume

-Tone control

-Surround

-L/R-Mix

(for Woofer out)

- or others

ADC

DAC

SUB

auduo

processor

-Volume

Audio line output

DAC

J706

Head

Phone

Jack

MAIN_L_P

SUB_P

AMPVCC

SAMPVCC

MAIN_L_N

MAIN_R_P

MAIN_R_NSpeaker -R

Speaker -

Woofer

Volume1

from

IC300

#24

Volume control for MAIN

Amp

Volume control for SUB Amp

0.02Vdc to 1.15VdcAMPVCC

SAMPVCC

LT-2220 LT-3020

7.5V

9V9V

12V

Table: Supplied voltage to Amp +B

J705

PWB-MAINPWB-SET(SUB)

PWB-MAIN

SUB_N

3.3V

Page 32

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

TEST POINT LOCATIONS AND DESCRIPTIONS

Test points, locations and descriptions are shown below.

(1) PWB-SET (SUB)

Test Point Location Description Note

1 Pin1 of J800 J801(Fuse-clip) 20Vdc from AC-ADAPTOR 22inches only

2 F800 J802(Fuse-clip) 20Vdc behind the fuse F800 22inches only

3 INV-SW Pin12 of J821 Used to control inverter ON/OFF. (0V :

OFF , 5Vdc : ON)

4 BRIGHT Pin14 of J821 Used for brightness control of

inverter. (PWM control)

(Max : 5Vdc, Min : thin pulse)

5 24V Pin4, 6 of J810 24Vdc from Power-unit. 30inches only

6 8.5V Pin2 of J810 8.5Vdc from Power-unit. 30inches only

7 IN_24V Pin8 of J810 3.3Vdc.

Used for ON/OFF control of the power

supply from the POWER-UNIT.

30inches only

8 Psave1 Pin5 of J712 ON/OFF control signal of D3.3V, A3.3A.

(0V : OFF , 3.3Vdc : ON)

9 A8V (+) of C733 8Vdc.

Used to supply power to IC710.

10 AMPVCC Pin1 of IC711 7~9Vdc.

Used to supply power to IC711.

11 SAMPVCC Pin1 of IC712 8~12Vdc.

Used to supply power to IC712.

12 Psave2 Pin6 of J712 ON/OFF control signal of A9V, A8V

A5A. (0V : OFF , 3.3Vdc : ON)

13 Psave3 Pin7 of J712 ON/OFF control signal of AMPVCC,

SAMPVCC. (0V : OFF , 3.3Vdc : ON)

14 MPX Pin8 of J710 Analog video signal from TV input.

Voltage level is 1.0Vp-p (Typical)

15 SW_L Pin10 of J710 Audio L signal for PC or Monitorlink or

Component input.

16 SW_R Pin12 of J710 Audio R signal for PC or Monitorlink or

Component input.

17 5V_SDA 5 of J711 Serial port data I/O for IC of 5V power

supply.

18 5V_SCL 6 of J711 Serial port data clock for IC of 5V

power supply.

19 MPX_RST Pin10 of J711 Reset signal of IC710.

(0V : reset)

20 F880 F880 7~9Vdc.

Power supply fuse for IC711.

21 F870 F870 8~12Vdc.

Power supply fuse for IC712.

Page 33

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

IC701

AV-SW

IC710

SOUND-

PRO

CESSOR

J8A0(XH10)

J715(PH6)

Radiator

IC711(IC-AMP)

Radiator

IC712(IC-AMP)

J710(PH-12)

J702

S1J704

J800

DC-IN

IC702

LPF

J810

(

VH-8P)

J820(PH-15)J821(PH-16)

J712(PH-13)J711(PH-14)

IC860

-DC

J8T0

XH3

IC8X0

RS-232C

J703

VIDEO2/AUDIO2

J8X0

RS232CJ705

Line Out

J701

VIDEO1/AUDIO1

RLY

J8T1

XH3

J706

IC880

-DC

IC870

-DC

IC850

-DC

IC840

-DC

IC830

-DC

J801 J802

F800

12 : INV-SW

14 : BRIGHT

810

5 : Psave1

(+) of C733

1 of IC712

1 of IC711

6 : Psave2

7 : Psave3

8 : MPX

10 : SW_L

12 : SW_R

4 : ON_24V

PWB-SET(SUB)

2 : 8.5V

4 : 24V

6 : 24V

5 : 5V_SDA

6 : 5V_SCL18

10 : MPX_RST

F880

F870

Page 34

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

(2) PWB-MAIN

Test Point Location Description Note

1 S5V Pin12 of J303 5Vdc(always on ).

Power supply voltage for MCU, etc.

2 S3.3V Pin13 of J303 3.3Vdc(always on ).

Power supply voltage for MCU, etc.

3 D3.3V Pin7 of J190 3.3Vdc.

Power supply for IC300, IC4A0, IC4A1

etc.

4 A5V Pin1 of J190 5Vdc.

Power supply for IC204, IC201 etc.

5 A3.3V Pin5 of J190 3.3Vdc.

Power supply for IC203, etc.

6 D2.5V Pin8 of J190 2.5Vdc.

Power supply for IC500.

7 AD3.3V Pin6 of J190 3.3Vdc.

Power supply for IC2A3, IC205, IC2J1,

etc.

8 D1.9V L400 1.9Vdc.

Power supply for IC500.

9 Digital_G7 14 of IC4A1 3.3Vdc.

MSB of green digital video signal to

LCD panel.

10 QHS

-27 of IC4A1 R4H6 Horizontal sync signal to LCD panel

11 QVS

-28 of IC4A1 R4H5 Vertical sync signal to LCD panel

12 QCLK

-31 of IC4A1 R4H3 Clock signal to LCD panel

13 QDE

-30 of IC4A1 R4H4 Data_Enable signal to LCD panel

14 A9V 10 of J190 9Vdc.

Power supply for IC100.

15 30V Pin7 of IC180 30Vdc.

Power supply for TU1A0.

16 A1.5V,

D1.5V Pin3 of IC600 1.5Vdc.

Power supply for IC601.

17 TU_SDA Pin31 of IC300 Serial port data I/O for TU1A0.

18 TU_SCL Pin28 of IC300 Serial port data clock forTU1A0.

19 S3.3V(RMC) Pin1 of J301 3.3Vdc(always on ).

Power supply for IR receiver and front

switches, etc.

20 RMC Pin2 of J301 Data signal from IR receiver.

This data is sent to MCU.

21 KEY1 Pin4 of J301 Data signal from front switch.

This data is sent to MCU.

22 KEY2 Pin5 of J301 Data signal from front switch.

This data is sent to MCU.

23 V_OUT Pin2 of J110 Analog video signal from VIDEO 1&2

inputs. (Composite video)

24 SY_OUT Pin4 of J110 Analog video signal from VIDEO 1&2

inputs. (S-video)

Page 35

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

IC400

GRAPHIC

& SCALER

IC204

VIDEO-SW

IC4A0

IC-OSD

IC4A1

LVDS-Tx

IC501

SDRAM64

IC201

VIDEO-SW

IC2A3

A/D-C

IC300

MCU

IC401

SDRAM16

IC205

A/D-C

J302

MCUWR

J190(XH-10)

J4A0

IC602

SDRAM16

J2J0

MONITOR-LINK

J103

PC-AUDIO

J110(PH-12)

J101

COMPONENT-

AUDIO(1and2)

J201

COMPONENT(1and2)

PrPbY

J2A1

PC(D-sub)

J300(PH-13)J303(PH-14)

IC100

AV-SW

J102

MONITOR

-LINK

-AUDIO

L/R

IC500

3D-I/ P

gm6015

IC601

DECODER

with 3D-Y/C

IC4A2

IC4A3

08 IC4A4

IC2A2

IC202

1881

IC2J2

EEP

IC2A1

EEP

IC301

RST

IC305

LM324

IC303

EEP

TUNER

J301(PH-9)

IC203

157

IC600

3012

IC180

LA7995

IC490

20M

16MHz

14.318M

24.576M

IC402

3018

IC2J1

TMDS-Rx

1 9

L400 (D1.9V)

1 20

J180

3 of IC600

7 of IC180

28 of IC300

31 of IC300

PWB-MAIN

13 : S3.3V

12 : S5V2

5 : A3.3V

1 : A5V

7 : D3.3V

6 : AD3.3V

10 : A9V

8 : D2.5V

614

14 of IC4A19

R4H5

R4H3

R4H6

R4H4

1310

1211

2 : RMC

1 : S3.3V(RMC)

5 : KEY2

4 : KEY119

21 20

2 : V_OUT

4 : SY_OUT23

Page 36

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

1. Power failure

1.1 In case of LT-22XX

(1)POWER is turned off.

Connect the Power plug and turn on the main Power switch (Front switch or remote control).

Is the POWER LED lit? Is the power plug connected

to the wall outlet correctly?

YES

·To “Flashing in green”(2)

·To “Flashing in amber”(3)

Poor power plug connection.

NO NO

Is the 20V DC available before

the fuse F800?

(Observing point : J801)

*Voltage range of 20V :18~21V

NO The AC-ADAPTOR is out of

order.

YES

Is 20V DC available behind

the fuse F800?

(Observing point : J802)

*Voltage range of 20V :18~21V

NO Fuse F800 have blown out. If

the fuse are replaced and it

blows out again, the AC-

ADAPTOR is out of order.

YES

Is the S5V and S3.3V, AD3.3V output

available at Pin12(S5V) and Pin13

(S3.3V) of J303 and at Pin6 of J190

(PH connector)?

NO Power supply circuit

which generates S5V

and S3V and AD3.3V in

the PWB-SUB(SET) is

out of order.

YES

IC300 and peripheral circuits

are out of order.(PWB-MAIN)

CN Pin No. Voltage

S5V J303 12 5Vdc

S3.3V J303 13 3.3Vdc

AD3.3V J190 6 3.3Vdc

YES

Is all harness connected

correctly?

All harness connects

correctly.

Page 37

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

(2)Flashing in green.

(3)Flashing in Amber.

Is the back-light on?

YES

Is the INV-SW output 5V-level

at Pin12 of the J821 connector?

(PH connector)

Is the BRIGHT output about 5V

level at Pin14 of the J821

connector? (PH connector)

YES

IC300 and peripheral circuits

are out of order.(PWB-MAIN)

YES

Is the following harness connected?

-Between PWB-SUB(SET) and

INVERTER (J821-INVERTER)

-Between back-lights and

INVERTER

YES

NO Poor harness connection.

Inverter or back-light of LCD-

panel are out of order.

Skip to “2. No picture

displayed and picture

errors.”

If POWER switch is

pushed, does LED

become green?

YES

IC300 and peripheral circuits

are out of order.(PWB-MAIN)

IC300 and peripheral circuits

are out of order.(PWB-MAIN)

Skip to the above-mentioned

“(2) Flashing in green” .

Page 38

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

1.2 In case of LT-30XX

(1)POWER is turned off.

Connect the Power plug and turn on the main Power switch (Front switch or remote switch).

Is the POWER LED lit? Is the power plug connected

to the wall outlet correctly?

YES

·To “Flashing in green”(2)

·To “Flashing in amber”(3)

Poor power plug connection.

NO NO

YES

Is the 24V and 8.5V output

available at Pin2(8.5V) and

Pins 4, 6(24V) of the J810

connector? (VH connector)?

*Voltage range of 8.5V :8.1~8.8V

*Voltage range of 24V :22~26V

NO Is the IN_24V output

3Vdc at Pin8(24V) of the J810

connector? (VH connector)

If not outputting, IC300 or its

Periphral circuits is out of

order.(PWB-MAIN)

If outputting, Power unit is

out of order.

YES

IC300 and peripheral circuits

are out of order.(PWB-MAIN)

Pin No. Voltage

8.5V 2 8.5Vdc

24V 4, 6 24Vdc

YES

Is all harness connected

correctly?

All harness connects

correctly.

Is the S5V and S3.3V, AD3.3V output

available at Pin12(S5V) and Pin13

(S3.3V) of J303 and at Pin6 of J190

(PH connector)?

NO Power supply circuit

which generates S5V

and S3V and AD3.3V in

the PWB-SUB(SET) is

out of order.

CN Pin No. Voltage

S5V J303 12 5Vdc

S3.3V J303 13 3.3Vdc

AD3.3V J190 6 3.3Vdc

Page 39

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

(2)Flashing in green.

(3)Flashing in Amber.

Is the back-light on?

YES

Is the INV-SW output 5V-level

at each Pin12 of the J821 and

J820 connector? (PH connector)

Is the BRIGHT output about 12V

level at each Pin14 of the J821

and J820 connector?

(PH connector)

*Voltage range : 10~14V

YES

IC300 and peripheral circuits

are out of order.(PWB-MAIN)

YES

Is the following two harness

connected?

-Between PWB-SUB(SET) and

INVERTER (J821-INVERTER)

(J820-INVERTER)

-Between back-lights and

INVERTER YES

NO Poor harness connection.

Inverter or back-light of LCD-

panel are out of order.

If POWER switch is

pushed, does LED

become green?

Skip to the above-mentioned

“(2) Flashing in green” .

YES

IC300 and peripheral circuits

are out of order.(PWB-MAIN)

IC300 and peripheral circuits

are out of order.(PWB-MAIN)

Skip to “2. No picture

displayed and picture

errors.”

Page 40

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

2. No picture displayed and picture errors (It applies both LT-30XX and LT-22XX)

Note ) It applies when there is no screen display or an unusual screen is outputted, although

power supply is turned on and the back light is turned on.

Before checking, perform the initial setup. (Input before the initial setup is channel 3 of TV.)

*Input source changes in following order with DEVICE UP button of remote control or

DEVICE

button of front switch.

2-1. No picture displayed and picture errors of PC signal.

Is all harness connected correctly?

(especially between PWB-MAIN

and LCD PANEL (J4A0-LCD))

NO Poor harness connection or

defective cable.

YES

Is OSD available? Problem is in IC300 or IC4A0 or IC4A1

(and peripheral circuits). Are the

specified voltages available at the

connectors below?

YES

Enter an input of WXGA(60Hz) gray scale

in D-sub connector(J2A1), and select PC INPUT.

(Push the device UP button 5 times.)

And then, perform AV reset by front switch.

The video level inputs above 0.7Vp-p.

TV Component1 Component2 Input1 Input2

DVI PC

Name Pin No. Voltage

S5V J303 12 5Vdc

S3.3V J303 13 3.3Vdc

D3.3V J190 7 3.3Vdc

Psave1* J712 5 3.3Vdc

* control signal of D3.3V

Problem is in the following

circuit (and peripheral

circuits) .

Voltage with

problem PWB

including

the circuit

in problem

S5V SET(SUB)

S3.3V SET(SUB)

D3.3V SET(SUB)

Psave1 MAIN

YES

2-1-2 (P*)

0.7Vp-p

2-1-1 (P*)

Page 41

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Problem is in IC2A3 or IC400

(and peripheral circuits). Are the

specified voltages available at the

connectors below?

LCD-module or IC4A1(PWB-MAIN) are out of

order.

IC2A3 or IC400 (and peripheral circuits) are out

of order.(PWB-MAIN)

Name Pin No. Voltage

AD3.3V J190 6 3.3Vdc

D1.9V L400 - 1.9Vdc

NO When the shown voltage is in

problem, PWB including the power

supply circuit(and peripheral

circuits) is the following.

Voltage with

problem PWB including

the circuit in

problem

AD3.3V SET(SUB)

D1.9V MAIN

Is the digital video signal available at pin 14(G_7)

of IC4A1, and control signals of 3Vp-p available at

pins 27(HS : R4H6) and 28(VS : R4H5) and

31(CLK : R4H3) and 30(DE : R4H4) of IC4A1 ?

27 of IC4A1

28 of IC4A1

(f=60Hz)

3Vp-p

14 of IC4A1

(MSB of Green) 3Vp-p

31 of IC4A1

(f=70MHz) 3Vp-p

(f=48KHz)

2-1-2 (P*) 2-1-1 (P*)

30 of IC4A1

3Vp-p

(f=48KHz)

YES

NO IC300 or IC4A0 (and

peripheral circuits) are

out of order. (PWB-

MAIN)

YES

Page 42

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

2-2. No picture displayed and picture errors of Component signal.

Enter an input of D1(480i) gray scale in J201

connector, and select COMPONENT1 (or2) INPUT.

(Push the device UP button once.: twice in the case

of COMPONENT2)

And then, perform AV reset by front switch.

The video level inputs about 1.0Vp-p.

YES

Is OSD available? NO

YES

Problem is in IC300 or IC4A0 or IC4A1

(and peripheral circuits). Are the

specified voltages available at the

connectors below?

Name Pin No. Voltage

S5V J303 12 5Vdc

S3.3V J303 13 3.3Vdc

D3.3V J190 7 3.3Vdc

Psave1* J712 5 3.3Vdc

*control signal of D3.3V

YES

Problem is in the following

circuit (and peripheral

circuits) .

Voltage with

problem PWB

including

the circuit

in problem

S5V SET(SUB)

S3.3V SET(SUB)

D3.3V SET(SUB)

Psave1 MAIN

1.0Vp-p

Is all harness connected correctly?

(especially between PWB-MAIN

and LCD PANEL (J4A0-LCD))

NO Poor harness connection or

defective cable.

Is the digital video signal available at pin 14(G_7)

of IC4A1, and control signals of 3Vp-p available at

pins 27(HS : R4H6) and 28(VS : R4H5) and

31(CLK : R4H3) and 30(DE : R4H4) of IC4A1 ?

27 of IC4A1

28 of IC4A1

(f=60Hz)

3Vp-p

14 of IC4A1

(MSB of Green) 3Vp-p

31 of IC4A1

(f=70MHz) 3Vp-p

(f=48KHz)

30 of IC4A1

3Vp-p

(f=48KHz)

IC300 or IC4A0 (and

peripheral circuits) are

out of order. (PWB-

MAIN)

LCD-module or IC4A1

(PWB-MAIN) are out of

order.

YES

Page 43

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Problem is in IC204 or IC201 or IC205 or

IC500 or IC400 (and peripheral circuits).

Are the specified voltages available at the

connectors below?

IC204 or IC201 orIC205 or IC500 or IC400 (and

peripheral circuits) are out of order.(PWB-MAIN)

Name Pin No. Voltage

A5V J190 1 5Vdc

A3.3V J190 5 3.3Vdc

D2.5V J190 8 2.5Vdc

D1.9V L400 - 1.9Vdc

AD3.3V J190 6 3.3Vdc

When the shown voltage is in

problem, PWB including the power

supply circuit(and peripheral

circuits) is the following.

Voltage with

problem PWB including

the circuit in

problem

A5V SET(SUB)

A3.3V SET(SUB)

D2.5V SET(SUB)

D1.9V MAIN

AD3.3V SET(SUB)

2-2-1 (P*)

2-2-1(P*)

YES

Page 44

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

2-3. No picture displayed and picture errors of DVI signal.

Enter an input of D2(480p) gray scale

in J2J0 connector, and select DVI INPUT.

(Push the device UP button 6 times)

And then, perform AV reset by front switch.

The video level inputs above 0.7Vp-p.

YES

Is OSD available? NO

YES

Problem is in IC300 or IC4A0 or IC4A1

(and peripheral circuits). Are the

specified voltages available at the

connectors below?

Name Pin No. Voltage

S5V J303 12 5Vdc

S3.3V J303 13 3.3Vdc

D3.3V J190 7 3.3Vdc

Psave1* J712 5 3.3Vdc

*control signal of D3.3V

YES

Problem is in the following

circuit (and peripheral

circuits) .

Voltage with

problem PWB

including

the circuit

in problem

S5V SET(SUB)

S3.3V SET(SUB)

D3.3V SET(SUB)

Psave1 MAIN

0.7Vp-p

Is all harness connected correctly?

(especially between PWB-MAIN

and LCD PANEL (J4A0-LCD))

NO Poor harness connection or

defective cable.

Is the digital video signal available at pin 14(G_7)

of IC4A1, and control signals of 3Vp-p available at

pins 27(HS : R4H6) and 28(VS : R4H5) and

31(CLK : R4H3) and 30(DE : R4H4) of IC4A1 ?

27 of IC4A1

28 of IC4A1

(f=60Hz)

3Vp-p

14 of IC4A1

(MSB of Green) 3Vp-p

31 of IC4A1

(f=70MHz) 3Vp-p

(f=48KHz)

30 of IC4A1

3Vp-p

IC300 or IC4A0 (and

peripheral circuits) are

out of order. (PWB-

MAIN)

LCD-module or IC4A1

(PWB-MAIN) are out of

order.

YES

Page 45

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

IC2J1 or IC201 or IC205 or IC500 or IC400(and

peripheral circuits) are out of order. (PWB-MAIN)

Problem is in IC2J1 or IC201 or IC205 or

IC500 or IC400 (and peripheral circuits).

Are the specified voltages available at the

connectors below?

Name Pin No. Voltage

A5V J190 1 5Vdc

A3.3V J190 5 3.3Vdc

D2.5V J190 8 2.5Vdc

D1.9V L400 - 1.9Vdc

AD3.3V J190 6 3.3Vdc

NO When the shown voltage is in

problem, PWB including the power

supply circuit(and peripheral

circuits) is the following.

Voltage with

problem PWB including

the circuit in

problem

A5V SET(SUB)

A3.3V SET(SUB)

D2.5V SET(SUB)

D1.9V MAIN

AD3.3V SET(SUB)

(f=48KHz)

2-3-1 (P*)

YES

Page 46

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

2-4. No picture displayed and picture errors of VIDEO signal.

Enter an input of NTSC gray scale

in J2J0 connector, and select VIDEO1 (or 2) INPUT.

(Push the device UP button 3 times :

4 times in case of VIDEO2)

And then, perform AV reset by front switch.

The video level inputs about 1.0Vp-p.

YES

Is OSD available? NO Problem is in IC300 or IC4A0 or IC4A1

(and peripheral circuits). Are the

specified voltages available at the

connectors below?

Name Pin No. Voltage

S5V J303 12 5Vdc

S3.3V J303 13 3.3Vdc

D3.3V J190 7 3.3Vdc

Psave1* J712 5 3.3Vdc

*control signal of D3.3V

YES

Problem is in the following

circuit (and peripheral

circuits) .

Voltage with

problem PWB

including

the circuit

in problem

S5V SET(SUB)

S3.3V SET(SUB)

D3.3V SET(SUB)

Psave1 MAIN

1.0Vp-p

Is all harness connected correctly?

(especially between PWB-MAIN

and LCD PANEL (J4A0-LCD))

NO Poor harness connection or

defective cable.

Is the digital video signal available at pin 14(G_7)

of IC4A1, and control signals of 3Vp-p available at

pins 27(HS : R4H6) and 28(VS : R4H5) and

31(CLK : R4H3) and 30(DE : R4H4) of IC4A1 ?

27 of IC4A1

28 of IC4A1

(f=60Hz)

3Vp-p

14 of IC4A1

(MSB of Green) 3Vp-p

31 of IC4A1

(f=70MHz) 3Vp-p

(f=48KHz)

30 of IC4A1

3Vp-p

IC300 or IC4A0 (and

peripheral circuits) are

out of order. (PWB-

MAIN)

LCD-module or IC4A1

(PWB-MAIN) are out of

order.

YES

Page 47

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

IC100 or IC601 or IC500 or IC400(and peripheral

circuits) are out of order.(PWB-MAIN)

Problem is in IC100 or IC601 or IC500 or

IC400 (and peripheral circuits).

Are the specified voltages available at the

connectors below?

Name Pin No. Voltage

A9V J190 10 9Vdc

A1.5V IC600 3 1.5Vdc

D1.5V IC600 3 1.5Vdc

A3.3V J190 5 3.3Vdc

D2.5V J190 8 2.5Vdc

D1.9V L400 - 1.9Vdc

AD3.3V J190 6 3.3Vdc

When the shown voltage is in

problem, PWB including the power

supply circuit (and peripheral

circuits) is the following.

Voltage

with

problem

PWB including

the circuit in

problem

A9V SET(SUB)

A1.5V MAIN

D1.5V MAIN

A3.3V SET(SUB)

D2.5V SET(SUB)

D1.9V MAIN

AD3.3V SET(SUB)

YES

2-4-1 (P*)

YES

(f=48KHz)

Is the signal of 1.0Vp-p available at pin 2(V_out)

of J110,or pin 4 (SY_out) of J110?

Pin2 of J110

Pin4 of J110 1.0Vp-p

YES

NO IC701 or IC702 (PWB-

SET(SUB)) are out of order.

Page 48

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

2-5. No picture displayed and picture errors of TV signal.

Enter an input of NTSC gray scale

in TU1A0 (TUNER), and select TV INPUT.

(It may not push the device button after initial

setup. Adjust the channel of TV with the

channel of a signal source.)

And then, perform AV reset by front switch.

YES

Is OSD available? NO Problem is in IC300 or IC4A0 or IC4A1

(and peripheral circuits). Are the

specified voltages available at the

connectors below?

Name Pin No. Voltage

S5V J303 12 5Vdc

S3.3V J303 13 3.3Vdc

D3.3V J190 7 3.3Vdc

Psave1* J712 5 3.3Vdc

YES

Problem is in the following

circuit (and peripheral

circuits) .

Voltage with

problem PWB

including

the circuit

in problem

S5V SET(SUB)

S3.3V SET(SUB)

D3.3V SET(SUB)

Psave1 MAIN

YES

1.0Vp-p

Is all harness connected correctly?

(especially between PWB-MAIN

and LCD PANEL (J4A0-LCD))

NO Poor harness connection or

defective cable.

Is the digital video signal available at pin 14(G_7)

of IC4A1, and control signals of 3Vp-p available at

pins 27(HS : R4H6) and 28(VS : R4H5) and

31(CLK : R4H3) and 30(DE : R4H4) of IC4A1 ?

27 of IC4A1

28 of IC4A1

(f=60Hz)

3Vp-p

14 of IC4A1

(MSB of Green) 3Vp-p

31 of IC4A1

(f=70MHz) 3Vp-p

(f=48KHz)

30 of IC4A1

(f=48KHz)

IC300 or IC4A0 (and

peripheral circuits) are

out of order. (PWB-

MAIN)

LCD-module or IC4A1

(PWB-MAIN) are out of

order.

YES

Page 49

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

TU1A0 or IC100 or IC601 or IC500 or IC400 (and

peripheral circuits) are out of order. (PWB-MAIN)

Problem is in IC100 or IC601 or IC500 or

IC400 (and peripheral circuits).

Are the specified voltages available at the

connectors below?

Name Pin No. Voltage

30V IC180 7 30Vdc

A9V J190 10 9Vdc

A1.5V IC600 3 1.5Vdc

D1.5V IC600 3 1.5Vdc

A3.3V J190 5 3.3Vdc

D2.5V J190 8 2.5Vdc

D1.9V L400 - 1.9Vdc

AD3.3V J190 6 3.3Vdc

NO When the shown voltage is in

problem, PWB including the power

supply circuit (and peripheral

circuits) is the following.

Voltage with

problem PWB including

the circuit in

problem

30V MAIN

A9V SET(SUB)

A1.5V MAIN

D1.5V MAIN

A3.3V SET(SUB)

D2.5V SET(SUB)

D1.9V MAIN

AD3.3V SET(SUB)

3Vp-p

2-5-1 (P*)

YES

Page 50

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

3. No audio output generated.(It applies both LT-30XX and LT-22XX)

Notes) This model is enabled to set up an audio input terminal for each video input terminal. No

audio output is available unless the input terminal of displayed pictures (example:VIDEO1)

coincides with that of audio (example:PC). Therefore, analysis for troubleshooting should be

carried out after the displayed video input terminal (example:VIDEO1) has been made to coincide

with the input terminal according to the instruction manual.

Enter a signal input AUDIO in.

Is “TV speakers” setting on?

Raise volume level. And MUTE is turned off. Volume level is not 0. And MUTE is off.

YES

“TV speakers” setting is on.

YES

In case of TV input, is “Listen To:” setting set

to Stereo or Mono?

YES

“Listen To :” setting is set to Stereo

or Mono.

Are the specified voltages available at the

pins below? (Power source check)

Name Pin No. Voltage

S5V J303 12 5Vdc

A5V J8A0 1 5Vdc

A9V J8A0 10 9Vdc

A8V C733 - 8Vdc

AMPVCC IC711 1 7~9Vdc

SAMPVCC IC712 1 8~12V

Psave2* J712 6 3Vdc

Psave3** J712 7 3Vdc

*control signal of A9V, A8V, A5V

** control signal of AMPVCC, SAMPVCC

Problem is in the following

circuit (and peripheral

circuits) .

Voltage with

problem PWB

including

the circuit

in problem

S5V SET(SUB)

A5V SET(SUB)

A9V SET(SUB)

A8V SET(SUB)

AMPVCC SET(SUB)

SAMPVCC SET(SUB)

Psave2 MAIN

Psave3 MAIN

YES

Is voltage the same before and behind F870

and F880?

NO It replaces the PWB-SET(SUB).

(Fuse have blown out. )

YES

Page 51

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

YES

Is the signal below available at pins 5, 6 of

J711 (control signals of IC701 and IC710 and

IC100 ) and 10 of J711 (control signals of

IC710) and 28, 31 of IC300 (control signals of

TU1A0) ?

5, 6 of J711,

28, 31 of IC300 3Vp-p

IC300 (and peripheral circuits)

are out of order.(PWB-MAIN)

3Vdc 10 of J711

YES

3-A (P*)

Is sound signal outputted correctly at the

pins 10, 12 ,8 of J710 connector?

?It checks that a certain signal is outputting

in the voltage range of 1V.

YES

IC100 (and peripheral circuits)

are out of order.(PWB- SET(SUB))

IC701 and IC710 and IC711 and IC712 (and

peripheral circuits) are out of order.

(PWB-MAIN)

Page 52

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

4. Other faults.(It applies both LT-30XX and LT-22XX)

Notes) It considers the case where there are problems except 1, 2, 3.

4-1. Remote control is not effective.

4-2. Front switch is not effective.

After checking the polarity of batteries, has

it loaded correctly?

Does it use within 20 feet?

Load the batteries, making sure the

polarities (-) and (+) are correct.

Regarding as the slide switch at the top of

the remote, does it set as “TV”?

YES

It sets the slide switch as “TV”.

it uses within 20 feet.

It does not operate, even if it exchanges for

new batteries.

NO It exchanges on new batteries.

Is the following harness connected correctly?

·Between PWB-MAIN and PWB-CONT

(J301-J0A1)

NO Poor harness connection or

defective cable.

YES

When it pushes the front switch, is the signal

below available at pins 1, 4, 5 of J301

(remote control and front switch use) ?

3Vp-p only when switch is not pushed.

0V only when switch is pushed.

YES

IC300 (and peripheral circuits) are out of order.(PWB-MAIN)

3Vdc 1

4, 5 :

YES

When it pushes the remote switch, is the

signal below available at pins 1, 2, of J301

(remote switch use) ?

3Vdc 1

Skip to “4-2 front switch is not effective”.

3Vp-p

Problem is in the following

PWB (and peripheral circuits).

Pin with

problem PWB

including

the circuit

in problem

2 of J301 CONT

1 of J301 MAIN

Problem is in the following

PWB (and peripheral circuits).

Pin with

problem PWB

including

the circuit

in problem

4, 5 of J301 CONT

1 of J301 MAIN

Page 53

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Page 54

Part Number Description Part Number Description

7A930032 AC-ADAPTER (SEB150P2-20.0B) 7A930032 AC-ADAPTER (SEB150P2-20.0B)

25327981 BACK-UNIT (CABINET-BACK LT2220/2240) 25327981 BACK-UNIT (CABINET-BACK LT2220/2240)

08LA10AE BEZEL (INCLUDES INNER BEZEL & PLATE) 08LA10AE BEZEL (INCLUDES INNER BEZEL & PLATE)

25327921 BEZEL-INNER (LC-T2220) 25327973 BEZEL-UNIT (LC-T2240 GRY)

25327971 BEZEL-UNIT (LC-T2220 GRY) 79PQ6640 CORD-POWER (1.9M 2P BLK)

7A081023 CORD-POWER (1.9M 2P BLK) 25435861 COVER-LEFT

25435861 COVER-LEFT 25435911 COVER-REAR (CLEAR)

25435911 COVER-REAR (CLEAR) 25435851 COVER-RIGHT

25435851 COVER-RIGHT 25435881 COVER-TERMINAL LEFT

25435881 COVER-TERMINAL LEFT 25435871 COVER-TERMINAL RIGHT

25435871 COVER-TERMINAL RIGHT 3A684064 LCD (LC56XWC8V-02) T/A REQ

3A684043 LCD (AA220TA01) T/A REQUIRED 3A681009 LED (SML78420C)

3A681009 LED (SML78420C) PWB-CONTROL LT2240 PWB-CONTROL/LED T/A REQUIRED

PWB-CONTROL LT2220 PWB-CONTROL/LED T/A REQUIRED 8BL63M15 PWB-MAIN (LT-2240) T/A REQUIRED

8BL61M12 PWB-MAIN (LT-2220) T/A REQUIRED PWB-SUB LT2240 PWB-SUB T/A REQUIRED

PWB-SUB LT2220 PWB-SUB T/A REQUIRED PWB-TUNER LT2240 PWB-TUNER

PWB-TUNER LT2220 PWB-TUNER T/A REQUIRED 79PQ6596 REMOTE

7A930037 REMOTE(EUR7616Z20/Z2A) 3A290003 REMOTE-RECEIVER (GP1UD263XK)

3A290003 REMOTE-RECEIVER (GP1UD263XK) 7A930033 SPEAKER-UNIT(ST-220-1)

7A930033 SPEAKER-UNIT(ST-220-1) 25261691 STAND-UNIT (GREY)

25261691 STAND-UNIT (GREY) 7A930029 TUNER (115V VF045AR)

7A930029 TUNER (115V VF045AR) 79PQ6630 UNIT-INVERTER (J191007.01)

7A930030 UNIT-INVERTER (J191007.00)

Part Number Description Part Number Description

25327961 BACK-UNIT 25327961 BACK-UNIT

08LB10AE BEZEL (INCLUDES INNER BEZEL & PLATE) 08LB10AE BEZEL (INCLUDES INNER BEZEL & PLATE)

25327891 BEZEL-INNER (LC-T3020) 25327952 BEZEL-UNIT

7A081022 CORD-POWER (2.0M 2P BLK) 7A392043 CABLE-ANT(BLACK RF-RF)

25435841 COVER-CORD 79PQ6612 CORD-POWER(2.0M 2P BLK)

25435861 COVER-LEFT 25435841 COVER-CORD

25435831 COVER-REAR 25435861 COVER-LEFT

25435851 COVER-RIGHT 25435831 COVER-REAR

25435881 COVER-TERMINAL LEFT 25435851 COVER-RIGHT

25435871 COVER-TERMINAL RIGHT 25435881 COVER-TERMINAL LEFT

25327951 FRONT-CABINET (W/BUTTONS LT-3020) 25435921 COVER-TERMINAL RIGHT

3A684029-M LCD (LC300W01 A3 LGPL) T/A REQ 3A684029-M LCD (LC300W01 A3 LGPL) T/A REQ

3A681009 LED (SML78420C) 3A681009 LED (SML78420C)

25620101 PLATE (COSMETIC LC-T3020) 7A930031 POWER-UNIT (HS210N2J)(T/A REQ)

7A930031 POWER-UNIT (HS210N2J)(T/A REQ) PWB-CONTROL LT3040 PWB-CONTROL/LED T/A REQUIRED

PWB-CONTROL LT3020 PWB-CONTROL/LED T/A REQUIRED 8BL73M15 PWB-MAIN (LT-3040) T/A REQUIRED

8BL71M12 PWB-MAIN (LT-3020) T/A REQUIRED PWB-SUB LT3040 PWB-SUB T/A REQUIRED

PWB-SUB LT3020 PWB-SUB T/A REQUIRED PWB-TUNER LT3040 PWB-TUNER T/A REQUIRED

PWB-TUNER LT3020 PWB-TUNER T/A REQUIRED 79PQ6596 REMOTE

7A930037 REMOTE(EUR7616Z20/Z2A) 3A290003 REMOTE-RECEIVER (GP1UD263XK)

3A290003 REMOTE-RECEIVER (GP1UD263XK) 7A930034 SPEAKER-UNIT(ST-300-1)

7A930034 SPEAKER-UNIT(ST-300-1) 25261681 STAND-UNIT (GREY)

25261681 STAND-UNIT (GREY) 7A930029 TUNER (115V VF045AR)

7A930029 TUNER (115V VF045AR)

LT-2240 PARTS LISTLT-2220 PARTS LIST

LT-3020 PARTS LIST LT-3040 PARTS LIST

Page 55

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050

Part Number Description

08LB20AE BEZEL (INCLUDES INNER BEZEL & PLATE)

3A684029-M LCD (LC300W01 A3 LGPL) T/A REQ

8BL72M15 PWB-MAIN (LT-3050) T/A REQUIRED

25327961 BACK-UNIT

25327952 BEZEL-UNIT

7A392043 CABLE-ANT(BLACK RF-RF)

79PQ6612 CORD-POWER(2.0M 2P BLK)

25435841 COVER-CORD

25435861 COVER-LEFT

25435831 COVER-REAR

25435851 COVER-RIGHT

25435881 COVER-TERMINAL LEFT

25435921 COVER-TERMINAL RIGHT

3A681009 LED (SML78420C)

7A930031 POWER-UNIT (HS210N2J)(T/A REQ)

PWB-CONTROL LT3050 PWB-CONTROL/LED T/A REQUIRED

PWB-SUB LT3050 PWB-SUB T/A REQUIRED

PWB-TUNER LT3050 PWB-TUNER T/A REQUIRED

79PQ6618 REMOTE

3A290003 REMOTE-RECEIVER (GP1UD263XK)

7A930034 SPEAKER-UNIT(ST-300-1)

25261681 STAND-UNIT (GREY)

7A930029 TUNER (115V VF045AR)

LT-3050 PARTS LIST

Cover.p65 LT 2240 2220 40 3020 50 Service Manual

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