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Mitsubishi Electric LT-2220 Service Manual

Liquid crystal display television.
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MITSUBISHI ELECTRIC
CAUTION:
Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCT SAFETY NOTICE" contained in this manual.
• 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
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
Copyright © 2004 Mitsubishi Digital Electronics America, Inc.
Service
Manual
LIQUID CRYSTAL DISPLAY TELEVISION

SPECIFICATIONS

• Weight and dimensions shown are approximate.
• Design specifications are subject to change without notice.
9351 Jeronimo Road, Irvine, CA 92618-1904
All Rights Reserved
LT-2220
LT-2240
LT-3020
LT-3040
LT-3050
• 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)
• W e ight / Ca bine t Dim e nsions
W ith S ta nd: He ight W idth
[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 S ta nd: He ight W idth
[LT-22XX] 18-5/8" 22-3/4"
[LT-30XX] 23-1/4" 29-3/4"
2003-2004
De pth W e ight
De pth W e ight
4"
19.8 lbs
5"
37.5 lbs

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Troubleshooting

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   Summary of Contents for Mitsubishi Electric LT-2220

  • Page 1: Service Manual

    • Frequency Range : VHF 54 ~ 470MHz UHF 470 ~ 806MHz • LCD Panel : Resolution - 1280X768 : Pixel Pitch - [LT-2220, LT-2240] 0.375mm • Speakers : [LT-2220, LT-2240] [LT-3020, LT-3040, LT-3050] 0.5025mm Left & Right (2 X 2.3W) Sub (3.4W) : [LT-3020, LT-3040, LT-3050] •...

  • Page 3: Table Of Contents

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

  • Page 4

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 Page 4...

  • Page 5: Introduction

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

  • Page 6

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 Page 6...

  • Page 7: Disassembly Lt-22xx

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-22XX) Remove the screws and components in the quantities indicated. Reassemble in reverse order. 1. COVER, REAR 2. STAND UNIT Page 7...

  • Page 8

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED 3. BACK UNIT 4. BACK COVER Page 8...

  • Page 9

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-22XX0) CONTINUED 5. PWB-SET 6. PWB-MAIN Page 9...

  • Page 10

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED 7. CHASSIS BASE Page 10...

  • Page 11

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED 8. LCD 9. PANEL Page 11...

  • Page 12

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED WIRING HARNESS LOCATIONS Page 12...

  • Page 13

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-30XX) Remove the screws and components in the quantities indicated. Reassemble in reverse order. 1. COVER, REAR Page 13...

  • Page 14

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED 2. STAND UNIT 3. BACK COVER Page 14...

  • Page 15

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED 4. UNIT SPEAKER 5. BRACKET, VESA Page 15...

  • Page 16

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED 6. SHIELD, POWER & SHIELD, CASE 7. COVER, TERMINAL, LEFT & RIGHT Page 16...

  • Page 17

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED 8. ASSY-PWB-MAIN/ASSY-PWB-SET/UNIT-POWER Page 17...

  • Page 18

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED 9. CHASSIS, REAR Page 18...

  • Page 19

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED 10. BRACKET T/B/LCD PANEL 11. BEZEL Page 19...

  • Page 20

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED WIRING HARNESS LOCATIONS Page 20...

  • Page 21: Initial Setup

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

  • Page 22

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

  • Page 23: Circuit Explanations

    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.

  • Page 24

    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.

  • Page 25

    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.

  • Page 26

    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...

  • Page 27

    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.

  • Page 28

    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.

  • Page 29: Block Diagrams

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 BLOCK DIAGRAM of LT-22XX/LT-30XX(except Power) PC_DDC IC2A2 PC_H,V PC_H,V 74LCX14 3.3V IC2A3 Analog RGB IC490 AD9883A H,V,CLK 20MHz 3.3V IIC Conponent 1 A/D(PC) (VIDEO) 3.3V R,G,B IC204 add=98H Conponent 2...

  • Page 30

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 POWER CIRCUIT BLOCK DIAGRAM FOR LT-22XX / LT30XX "22 Only Adaptor SEB150P2 JP JP AC-Adaptor PWB-SET(SUB) "22 "22 "22 Only OnlyOnly 24V (1) "30 Only "22: 3A "30: 2.8A (2.5A)

  • Page 31

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 PC& V i d e o B L OCK DI A GRA M f o r L T -2 2XX /L T -3 0XX Vcc=A3.3V Vcc=D3.3V/1.9V Composite H DVI H/V...

  • Page 32

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 A U DI O B l o c k Di a g r a m f o r L T -2 2XX /L T -3 0XX PWB-SET(SUB) PWB-MAIN AMPVCC SAMPVCC...

  • Page 33: Test Point Locations And Descriptions Pwb-set Test Point Locations And Description

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

  • Page 34

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 PWB- SET(SUB) J706 IC701 AV- SW 5 : 5V_ SDA 6 : 5V_SCL 10 : MPX_RST IC702 (+) of C733 IC710 SOUND- CESSOR F880 4 : ON_24V 5 : Psave1...

  • Page 35: Pwb-main Test Point Locations And Description

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 (2) PWB-MAIN Test Point Location Description Note Pin12 of J303 5Vdc(always on ). Power supply voltage for MCU, etc. S3.3V Pin13 of J303 3.3Vdc(always on ). Power supply voltage for MCU, etc.

  • Page 36

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 PWB- MAIN 12 : S5V 13 : S3.3V J302 J4A0 J303(PH- 14) J300(PH- 13) MCUWR IC305 16MHz LM324 IC4A1 J103 LVDS- Tx 31 of IC300 PC- AUDIO IC300 14 of IC4A1...

  • Page 37: Troubleshooting Lt-22xx Power Troubleshooting

    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 Poor power plug connection.

  • Page 38

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 (2)Flashing in green. Is the back-light on? Is the following harness connected? Poor harness connection. -Between PWB-SUB(SET) and INVERTER (J821-INVERTER) -Between back-lights and INVERTER Is the INV-SW output 5V-level IC300 and peripheral circuits at Pin12 of the J821 connector? are out of order.(PWB-MAIN)

  • Page 39: Lt-30xx Power Troubleshooting

    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 Poor power plug connection.

  • Page 40

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 (2)Flashing in green. Is the back-light on? Is the following two harness Poor harness connection. connected? -Between PWB-SUB(SET) and INVERTER (J821-INVERTER) (J820-INVERTER) -Between back-lights and INVERTER Is the INV-SW output 5V-level...

  • Page 41: Video Troubleshooting

    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.

  • Page 42

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 2-1-1 (P*) 2-1-2 (P*) Is the digital video signal available at pin 14(G_7) IC300 or IC4A0 (and of IC4A1, and control signals of 3Vp-p available at peripheral circuits) are pins 27(HS : R4H6) and 28(VS : R4H5) and out of order.

  • Page 43

    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 1.0Vp-p...

  • Page 44

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 2-2-1(P*) 2-2-1 (P*) Problem is in IC204 or IC201 or IC205 or When the shown voltage is in IC500 or IC400 (and peripheral circuits). problem, PWB including the power Are the specified voltages available at the...

  • Page 45

    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) 0.7Vp-p...

  • Page 46

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 (f=48KHz) 2-3-1 (P*) 2-3-1 (P*) Problem is in IC2J1 or IC201 or IC205 or When the shown voltage is in IC500 or IC400 (and peripheral circuits). problem, PWB including the power...

  • Page 47

    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 : 1.0Vp-p...

  • Page 48

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 (f=48KHz) 2-4-1 (P*) 2-4-1 (P*) Problem is in IC100 or IC601 or IC500 or When the shown voltage is in IC400 (and peripheral circuits). problem, PWB including the power Are the specified voltages available at the...

  • Page 49

    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 1.0Vp-p...

  • Page 50

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 3Vp-p 2-5-1 (P*) 2-5-1 (P*) Problem is in IC100 or IC601 or IC500 or When the shown voltage is in IC400 (and peripheral circuits). problem, PWB including the power Are the specified voltages available at the...

  • Page 51: Audio Troubleshooting

    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).

  • Page 52

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 3-A (P*) 3-A (P*) Is the signal below available at pins 5, 6 of IC300 (and peripheral circuits) J711 (control signals of IC701 and IC710 and are out of order.(PWB-MAIN)

  • Page 53: Remote Control & Front Switch Troubleshooting

    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. After checking the polarity of batteries, has...

  • Page 54

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 LT-2220 PARTS LIST LT-2240 PARTS LIST 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 &...

  • Page 55: Replacement Parts Replacement Parts List

    MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 LT-3050 PARTS LIST 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...

This manual also for:

Lt-3020, Lt-3040, Lt-3050, Lt-2240

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