Cover.p65 LT 2240 2220 40 3020 50 Service Manual
User Manual: LT-2240
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2003-2004 MITSUBISHI ELECTRIC Service Manual LIQUID CRYSTAL DISPLAY TELEVISION LT-2220 LT-2240 LT-3020 LT-3040 LT-3050 CAUTION: Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and "PRODUCT SAFETY NOTICE" contained in this manual. SPECIFICATIONS • Power • LCD Panel • Analog Inputs • Digital Input • Audio Outputs • Tuning : NTSC 181Channel Analog Cable : [LT-2220, LT-2240] AC ADAPTOR In - AC 120V, 60Hz; Out - 20VDC 6.0A : [LT-3020, LT-3040, LT-3050] 120V, 60Hz, 2.2A • Frequency Range : VHF 54 ~ 470MHz UHF 470 ~ 806MHz : Resolution - 1280X768 • Speakers : [LT-2220, LT-2240] : Pixel Pitch - [LT-2220, LT-2240] 0.375mm Left & Right (2 X 2.3W) Sub (3.4W) [LT-3020, LT-3040, LT-3050] 0.5025mm : [LT-3020, LT-3040, LT-3050] Left & Right (2 X 3.5W) Sub (6W) : VHF/UHF 75Ω unbalanced : Two A/V Inputs (Composite or S-Video) • W e ight / Ca bine t Dim e nsions L-R Audio W ith S ta nd: He ight W idth De pth W e ight : Two Component Video Inputs (480i/480p/ 720p/1080i) L-R Audio [LT-22XX] 20-1/4" 22-3/4" 11-7/8" 36.6 lbs : PC Input - 60Hz (VGA,S-VGA,XGA,W-XGA) [LT-30XX] 25-3/8" 29-3/4" 11-7/8" 54.3 lbs : PC Audio - 3.5mm Mini-Jack W /O S ta nd: He ight W idth De pth W e ight [LT-22XX] 18-5/8" 22-3/4" 4" 19.8 lbs : MonitorLink™/DVI (Video Sources Only) [LT-30XX] 23-1/4" 29-3/4" 5" 37.5 lbs L-R Audio (Analog) : MonitorLink™ Control/RS-232C : L-R Audio Output (Fixed/Variable) : Headphone Jack (Variable) 3.5mm • Weight and dimensions shown are approximate. • Design specifications are subject to change without notice. MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC. 9351 Jeronimo Road, Irvine, CA 92618-1904 Copyright © 2004 Mitsubishi Digital Electronics America, Inc. All Rights Reserved 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 ....................................................................................................................... 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 Page 3 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 Page 4 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. 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. 2. 3. 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. 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. 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). Page 5 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 Page 6 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 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED 3. BACK UNIT 4. BACK COVER Page 8 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-22XX0) CONTINUED 5. PWB-SET 6. PWB-MAIN Page 9 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED 7. CHASSIS BASE Page 10 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED 8. LCD 9. PANEL Page 11 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED WIRING HARNESS LOCATIONS Page 12 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 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED 2. STAND UNIT 3. BACK COVER Page 14 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED 4. UNIT SPEAKER 5. BRACKET, VESA Page 15 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 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 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED 9. CHASSIS, REAR Page 18 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 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 DISASSEMBLY PROCEDURE (LT-30XX) CONTINUED WIRING HARNESS LOCATIONS Page 20 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. 3. Press the "ADJUSTpq" buttons to select "INITIAL." 4. Press "ENTER." MENU-2-0-7-0 OPTION MENU Initial Power Restore DTV Port Direct Key Mode :OFF :Auto :OFF 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 MAIN MENU DEFAULT SETTINGS SETUP Memorize channels ANT-A - Air Language (idioma) English Front Button Lock Off CLOCK Clock Setting Manual Clock Time -- :-- -Set Day Sunday CAPTIONS Closed Captions On if Mute CC Background Gray CHANNEL EDIT Antenna ANT-A Channel 3 Memory Deleted Name N/A SQV N/A V-CHIP-LOCK V-Chip Off TV Rating TV-PG FV- Fantasy Violence Allow D-Sexual Dialog Allow L-Adult Language Allow S-Sexual Situations Allow V-Violence Allow Programs Not Rated Allow Movie Rating PG V-CHIP LOCK By Tim e V-Chip Start Time 12:00AM V-Chip Stop Time 12:00AM Lock by Time Off Lock Time N/A Unlock Time N/A ADVANCED FEATURES Video Mute On Black Enhancement On PC Power Save On TIMER Timer Off Set Time -- :-- -Set Day Sunday COLOR BALANCE Auto Color Correction Off MANUAL COLOR ADJUST Magenta 31 Red 31 Yellow 31 Green 31 Cyan 31 Blue 31 Page 21 AUDIO/VIDEO TV Speakers (Internal) Audio Output AUDIO SETTINGS Bass Treble Balance Sub-Woofer Level Surround TV Listen To Level Sound VIDEO SETTINGS Contrast Brightness Sharpness Color Tint Color Temp Video Noise Film Mode (Auto) Back Light PC/DVI H-Position PC/DVI V-Position PC Video Clock PC Fine Detail PC H-Resolution PC V-Resolution On Variable 31 31 31 31 Off Stereo Off 31 31 31 31 31 High Standard On 63 31 31 31 31 31 31 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 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. 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. 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.) 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. 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). MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 Table 1: Amp supply voltage(+B) AMPVCC(for main) SAMPVCC(for Sub Woofer) LT-22XX 7.5V 9V LT-30XX 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 20V 24V 8.5V A12V A9V A8V AMPVCC SAMPVCC S5V SW5V A30V S3.3V 4.5V D3.3V A3.3V AD3.3V D1.9V D2.5V 1.5V Voltage [V ] 20 24 8.5 12 9 8 “30 : 9 “22 :7.5 “30 : 12 “22 :9 5 5 30 3.3 4.5 3.3 3.3 3.3 1.9 2.5 1.5 “always on” or “ON/OFF” always on ON/OFF always on ON/OFF ON/OFF always on ON/OFF Control signal ON_24V Psave2 Psave2 Psave3 ON/OFF Psave3 always on ON/OFF ON/OFF always on always on ON/OFF ON/OFF always on ON/OFF ON/OFF ON/OFF Psave1 Psave1 Psave1 Psave1 Psave1 Psave1 Psave1 Note “22 only “30 only “30 only MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 BLOCK DIAGRAM of LT-22XX/LT-30XX(except Power) IC2A2 74LCX14 3.3V PC_H,V Component 1 L/R Component 2 L/R DVI AUDIO J102 PC AUDIO J103 5V IIC 24.576 MHz L/R CVBS/SY/SC IC702 18.432 MHz MM1566AF BUFFER Input 1 J703 Input 1 J704 Input 2 J701 AUDIO L/R S-Video AV SW CXA2089 9V add=90H 5V IIC MSP3440 Audio Processor 8V 5V add=80H Port 0 14.318 MHz Sub Woofer Out IC712 AMP AN7522 IC711 AMP AN7522 5BUS IC501 64M SDRAM IC401 16M SDRAM PC_H,V CCD_Main CCD_Sub MUXSEL PWBSET(SUB) MAIN L/R Out IC300 CPU M306V7 VRF/CTL Psave 1/2/3 Reset/RSB L RESETQ 5V IIC TU IIC 5V 3.3V 3.3V IIC PC_DDC R Woofer IC2A1 DDC_EEP 3.3V IC305 OPAMP LMV324 5V Volume 1/2 IC8X0 RS322 ADM3311 3.3V SW LED MonLink LCD Panel R,G,B IC301 RESET M51957 3.3V SW LR2 TV MPX IC710 3.3V 2.5V IC303 Head Phone J706 CVBS SW LR1 IC701 LVDS 3.3V 64K EEP 3.3V Audio Out J705 S-Video IC601 16M SDRAM IC4A1 24bit 5V IIC RESETQ AUDIO L/R Y,Cb/ Pb,Cr/Pr OSD MIX ENMA? R,G,B 16MHz Input 2 J702 Page 29 CVBS CCIR601 H,V,DE,CLK 16bit CXA2069 9V add=92H L/R 3D-I/P PiP/PoP 3.3V 2.5V H,V,DE,CLK Field 3D-YC DECODER 3.3V/1.5V add=B8H CVBS/Y/C IC500 gm6015 24bit 3.3V 1.9V PDWN IC100 AV SW IC4A0 M66617FP SCALER PiP/PoP OSD-MIX CCDSUB URANUS YUV/R,G,B IC601 UPD64011 CCDMAIN MPX Conponent AUDIO J201 A/D 3.3V add=9AH H,V,DE,CLK H,V,DE,CLK H,V,CLK/RST TV COMPOSIT_H2 H,V,CLK AD9883A 3.3V IIC IC400 BUS IC205 RESET/PSAVE1 TU IIC SW 74LV157 3.3V DVI H,V DVI H,V SYNC IC203 Port 1 IC2J2 E-DDC 3.3V SYNC SYNC SEP LM1881M VRF SW SM5301 5V Analog RGB IC202 MUXSEL IC201 Y for CCD2 DVI HD (J2J0) SiI907B TMDS HDCP 3.3V SW YPbPr/ BA7657 YCbCr 5V R,G,B RSTB IC204 Conponent 2 (VIDEO) A/D(PC) 3.3V add=98H CTL IC490 20MHz H,V,CLK BUS 3.3V IIC Conponent 1 (VIDEO) IC2J1 TU1A0 TUNER 30V 5V add=C0H IC2A3 AD9883A Analog RGB 3.3V IIC PC_H,V Component1 /2 J201 PC J2A1 (Dsub15) PC_DDC MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 POWER CIRCUIT BLOCK DIAGRAM 20V "22 Only Adaptor SEB150P2 5A AC-Adaptor "22 Only 24V (1) "30 Only PWB-POWER ON_24V 24V (2) "30 Only PWB-POWER ON_24V FOR LT-22XX / LT30XX 3A (2.7A) JP JP "22 "22 OnlyOnly PWB-SET(SUB) "22: 3A "30: 2.8A (2.5A) INVERTER TO INVERTER 3.8A (3.5A) "30: 2.8A (2.5A) INVERTER "30 Only TO INVERTER LCD PANEL A12V IC860 PQ1CY1032Z PSAVE2 "30: 0.9A "22: 0.8A A12V TO MAIN POWER-UNIT A9V IC8K0 BA178M09FP "30 Only 0.15A IC701 AV-SW CXA2089 A9V IC100 AV-SW CXA2069 TC1A0 TUNER 115VF045AR TO MAIN "22 Only A8V IC8J0 0.015A BA178M08FP IC710 MPX MSP3440G "30 Only PWB-MAIN 8.5V "30 Only PWB-POWER 1.2A AMPVCC IC870 PQ1CY1032Z PSAVE3 SAMPVCCIC880 PQ1CY1032Z PSAVE3 S5V IC850 PQ1CY1032Z "30: 9V "22: 7.5V 1.4A 1.2A IC712 MAIN AMP AN7522F "30: 12V "22: 9V 0.95A 0.6A IC711 SUB AMP AN7522F S5V 0.6A IC300 MPU M306V7 IC2A1 EEPROM 24LC21TSW TO MAIN IC710 MPX MSP3440G SW5V IC8E0 CPH6311 PSAVE1 0.4A : Power source is always ON DEVICE IC : use several power sources IC702 MM 1556AF IC305 IC201 IC204 TC1A0 IC202 A5V TO MAIN A30V IC180 LA7995M S3.3V IC8F0 SI3033LSA 0.05A 0.005A TC1A0 TUNER 115VF045AR IC8X0 ADM3311EARS S3.3V TO MAIN 4.5V IC840 PQ1CY1032Z 1.2A D3.3V IC8N0 SI3033LSA PSAVE1 0.5A D3.3V TO MAIN D1.9V IC402 SI3018KS PSAVE1 A3.3V IC8M0 SI3033LSA PSAVE1 AD3.3V IC8Y0 SI3033LSA D2.5V IC830 PQ1CY1032Z PSAVE1 0.8A 0.04A 0.27A A3.3V IC300 IC301 IC303 IC2A2 MPU M306V7 RESET IC M51957 EEPROM 24LC64T-I 74LCX14 IC400 IC500 IC501 IC401 IC602 IC601 IC4A0 IC4A1 IC4A4 IC4A2 IC490 Scaler Uranus M66473FP 3D I/P gm6015 DRAM64 K4S643232F-TC60 DRAM16 IC42S1600-7T *2 DRAM16 IC42S1600-7T *2 3D Y/C UPD64011 ENMA M66617FP LVDS THC63LVDM83R 74LCX74MTCX 74LCX04MTCX DSO751SV 20MHz IC400 Scaler Uranus M66473FP IC601 3D Y/C UPD64011 IC203 HD74LV157 TO MAIN 0.24A LMV324MTX AV-SW SM5301A AV-SW BA7657F TUNER 115VF045AR LM1881MX AD3.3V IC205 A/D AD9883 IC2A3 A/D AD9883 IC2J1 DVI SiI907B TO MAIN D2.5V IC500 3D I/P gm6015 IC4A0 ENMA2 M66617FP TO MAIN 1.5V IC600 SI3012KS 0.06A IC601 3D Y/C UPD64011 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 IC202 DVI H/V SYNC SEP LM1881M Vcc=D3.3V/1.9V Composite H IC203 HS_out sync SW 74LV157 Composite Sync Vcc=D3.3V/D2.5V Vcc=AD3.3V Input 2 J702 IC601 uPD64011 H/V/CLK/FIELD -3D-YC -DECODER -Black level / contrast CVBS/ control for TV /VIDEO SVideo input YUV 16 - 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 24 CCDMAIN CCDSUB S-Video Analog To IC300 (M602V7) RGB 24 WXGA60 WXGA60 Vcc=D3.3V H/V/CLK IC490 20MHz Digital Circuit IC4A1 LVDS Tx 24 - OSD MIX WXGA60 480i IC501 CVBS/ SVideo 24.576MHz IC702 MM1566AF BUFFER CVBS CXA2089 9V S-Video 3.3V IIC YCbCr/ YPbPr RGB OSD Mix between IC300 5V IIC 480i/480p/720p/1080i H/V/CLK Field CPU Bus Vcc=A9V IC500 gm6015 24 Vcc=A3.3V/A1.5V/D1.5 Vcc=A9V LPF CVBS IC701(AV SW) Input 2 J701 YUV/RGB TV Vcc=A5V Input 1 J704 Black level / contrast control for Component / DVI 9V Input 1 J703 H/V/CLK 64M SDRAM DVI HV ADC(for COMP/DVI) CPU Bus IC2J1 SiI907B - TMDS-Rx - HDCP Dec - DAC IC100 AV SW( CXA2069 ) MONITORLINK (J2J0) TMDS AV-SW -LPF Analog RGB IC205 AD9883A YPbPr/ RGB H/V/CLK IC4A0 M66617FP (ENMA II) CPU Bus IC201 3.3V IIC Vcc=D3.3V VRF MUXSEL YPbPr/ YCbCr Vcc=D3.3V/D2.5V 14.318MHz BA7657 AV-SW Vcc=AD3.3V - Scaler for PC - PiP/PoP control for PC and AV combination - Picture Enhancement - Auto Setup - Colorsync adjustment - Sync Separation for component CS - Gamma IC401 Vcc=A5V IC204 Composite H2 CTL (URANUS) VGA/SVGA/XGA/WXGA 3.3V IIC Vcc=D3.3V Conponent 2 Black level / contrast control for PC IC400 M66473FP 16M SDRAM ADC(for PC) IC601 Conponent 1 Vcc=A5V 24 16M SDRAM YpbPr/ YCbCr RGB Port1 74LCX14 Analog RGB Vcc=AD3.3V TU1A0 TUNER 30V 5V add=C0H IC2A3 AD9883A PC_H,V Y for CCD2 PC J2A1 (Dsub15) Component1/2 J201 IC2A2 Port0 H/V/CLK Vcc=S3.3V PC_H,V Vcc=D3.3V 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 Component 1 Audio (J201) Component 2 Audio (J201) IC710 MSP3440g MAIN_L_P IC100 Main Audio Processor Core AV-SW CXA2069 ADC DVI-AUDIO (J102) PC-AUDIO (J103) -De modulator -Volume -Tone control -Surround -L/R-Mix (for Woofer out) - or others MAIN Out IC712 AN7522 MAIN_L_N Speaker -L MAIN_R_P MAIN_R_N Speaker -R DAC Woofer out IC711 AN7522 SUB_P Speaker Woofer SUB_N J706 Head Phone Jack Input source Select VIDEO 1 IC701 VIDEO 2 ADC AV-SW CXA2089 SUB auduo processor DAC Audio line output J705 -Volume MPX from TU1A0 SIF output Volume1 from IC300 #24 3.3V 0V + - Volume control for MAIN Amp 0.02Vdc to 1.15Vdc IC305 + - PWB-MAIN Table: Supplied voltage to Amp +B LT-2220 AMPVCC SAMPVCC Volume control for SUB Amp LT-3020 7.5V 9V 9V 12V 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) 1 2 3 Test Point Pin1 of J800 F800 INV-SW Location J801(Fuse-clip) J802(Fuse-clip) Pin12 of J821 4 BRIGHT Pin14 of J821 5 6 7 24V 8.5V IN_24V Pin4, 6 of J810 Pin2 of J810 Pin8 of J810 8 Psave1 Pin5 of J712 9 A8V (+) of C733 10 AMPVCC Pin1 of IC711 11 SAMPVCC Pin1 of IC712 12 Psave2 Pin6 of J712 13 Psave3 Pin7 of J712 14 MPX Pin8 of J710 15 SW_L Pin10 of J710 16 SW_R Pin12 of J710 17 5V_SDA 5 of J711 18 5V_SCL 6 of J711 19 MPX_RST Pin10 of J711 20 F880 F880 21 F870 F870 Description 20Vdc from AC-ADAPTOR 20Vdc behind the fuse F800 Used to control inverter ON/OFF. (0V : OFF , 5Vdc : ON) Used for brightness control of inverter. (PWM control) (Max : 5Vdc, Min : thin pulse) 24Vdc from Power-unit. 8.5Vdc from Power-unit. 3.3Vdc. Used for ON/OFF control of the power supply from the POWER-UNIT. ON/OFF control signal of D3.3V, A3.3A. (0V : OFF , 3.3Vdc : ON) 8Vdc. Used to supply power to IC710. 7~9Vdc. Used to supply power to IC711. 8~12Vdc. Used to supply power to IC712. ON/OFF control signal of A9V, A8V A5A. (0V : OFF , 3.3Vdc : ON) ON/OFF control signal of AMPVCC, SAMPVCC. (0V : OFF , 3.3Vdc : ON) Analog video signal from TV input. Voltage level is 1.0Vp-p (Typical) Audio L signal for PC or Monitorlink or Component input. Audio R signal for PC or Monitorlink or Component input. Serial port data I/O for IC of 5V power supply. Serial port data clock for IC of 5V power supply. Reset signal of IC710. (0V : reset) 7~9Vdc. Power supply fuse for IC711. 8~12Vdc. Power supply fuse for IC712. Note 22inches only 22inches only 30inches only 30inches only 30inches only MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 J8T0 XH3 1 IC702 LPF 9 14 J711(PH- 14) IC8X0 RS- 232C IC860 DC - DC J705 Line Out IC701 AV- SW 5 : 5V_SDA 6 : 5V_SCL 17 18 10 : MPX_RST 19 (+) of C733 IC710 SOUNDPRO CESSOR IC880 DC - DC J703 VIDEO2/ AUDIO2 Y L R L R J706 HP J8T1 XH3 PWB- SET(SUB) 1 13 1 J712(PH- 13) 12 4 : ON_24V 5 : Psave1 6 : Psave2 7 : Psave3 J710(PH- 12) IC712(IC- AMP) Radiator IC870 DC - DC J701 VIDEO1/ AUDIO1 IC850 DC - DC 20 8 : MPX 10 : SW_L 12 : SW_R 7 8 12 13 1 F800 8 5 6 IC711(IC- AMP) 2 : 8.5V 4 : 24V 6 : 24V Radiator 21 12 12 16 1 1 1 of IC711 10 2 J802 1 16 J821(PH- 16) 12 : INV- SW 14 : BRIGHT 1 J820(PH- 15) 3 4 10 J715(PH6) J8A0(XH10) J810( VH- 8P) J8X0 RS232C J801 1 11 F870 IC830 DC - DC J702 S1 IC840 DC - DC 1 of IC712 J800 DC- IN Y L R J704 S2 F880 14 15 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 (2) PWB-MAIN Test Point Location Description 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 4 A5V Pin1 of J190 3.3Vdc. Power supply for IC300, IC4A0, IC4A1 etc. 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 7 AD3.3V Pin6 of J190 8 D1.9V L400 9 Digital_G7 14 of IC4A1 10 R4H6 R4H5 Vertical sync signal to LCD panel R4H3 Clock signal to LCD panel R4H4 Data_Enable signal to LCD panel 14 QHS -27 of IC4A1 QVS -28 of IC4A1 QCLK -31 of IC4A1 QDE -30 of IC4A1 A9V 2.5Vdc. Power supply for IC500. 3.3Vdc. Power supply for IC2A3, IC205, IC2J1, etc. 1.9Vdc. Power supply for IC500. 3.3Vdc. MSB of green digital video signal to LCD panel. Horizontal sync signal to LCD panel 10 of J190 15 30V Pin7 of IC180 16 Pin3 of IC600 17 18 19 A1.5V, D1.5V TU_SDA TU_SCL S3.3V(RMC) Pin31 of IC300 Pin28 of IC300 Pin1 of J301 20 RMC Pin2 of J301 21 KEY1 Pin4 of J301 22 KEY2 Pin5 of J301 23 V_OUT Pin2 of J110 24 SY_OUT Pin4 of J110 9Vdc. Power supply for IC100. 30Vdc. Power supply for TU1A0. 1.5Vdc. Power supply for IC601. Serial port data I/O for TU1A0. Serial port data clock forTU1A0. 3.3Vdc(always on ). Power supply for IR receiver and front switches, etc. Data signal from IR receiver. This data is sent to MCU. Data signal from front switch. This data is sent to MCU. Data signal from front switch. This data is sent to MCU. Analog video signal from VIDEO 1&2 inputs. (Composite video) Analog video signal from VIDEO 1&2 inputs. (S-video) 11 12 13 Page 35 Note MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 PWB- MAIN 1 2 IC303 EEP IC402 3018 IC400 GRAPHIC & SCALER J102 MONITOR - LINK - AUDIO IC201 VIDEO- SW IC490 20M IC501 SDRAM64 14.318M IC601 DECODER wit h 3D- Y/ C 3 of IC600 IC180 LA7995 9 15 7 of IC180 TUNER J190(XH- 10) IC100 AV- SW J110(PH- 12) IC602 SDRAM16 1 16 IC600 3012 24.576M IC203 157 IC205 A/ D- C 1 J301(PH- 9) 1 : S3.3V(RMC) 2 : RMC 4 : KEY1 5 : KEY2 19 20 21 22 IC2A1 EEP IC202 1881 IC2A3 A/ D- C IC2J2 EEP IC2J1 TMDS- Rx IC2A2 14 IC500 3D- I/ P gm6015 2 : V_OUT 4 : SY_OUT 23 24 1 : A5V 5 : A3.3V 6 : AD3.3V 7 : D3.3V 8 : D2.5V 10 : A9V 4 5 7 3 6 14 J180 20 R L Pr 8 L400 (D1.9V) Pb IC401 SDRAM16 Y IC4A0 IC- OSD IC300 MCU 9 J101 COMPONENTAUDIO(1and2) 14 of IC4A1 J103 PC- AUDIO L/ R 31 of IC300 16MHz J201 COMPONENT(1and2) 10 13 17 J2J0 MONITOR- LINK IC4A1 LVDS- Tx J302 MCUWR J2A1 PC(D- sub) IC4A4 IC4A2 74 04 11 12 R4H6 R4H4 R4H5 R4H3 IC305 LM324 IC4A3 08 J4A0 J300(PH- 13) IC204 VIDEO- SW J303(PH- 14) 28 of IC300 18 IC301 RST 12 : S5V 13 : S3.3V 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? YES NO Is the power plug connected NO Poor power plug connection. to the wall outlet correctly? YES · To “Flashing in green”(2) · To “Flashing in amber”(3) NO Is all harness connected correctly? All harness connects correctly. YES Is the 20V DC available before NO The AC-ADAPTOR is out of order. the fuse F800? (Observing point : J801) * Voltage range of 20V :18~21V YES NO Is 20V DC available behind Fuse F800 have blown out. If the fuse F800? the fuse are replaced and it (Observing point : J802) blows out again, the AC- * Voltage range of 20V :18~21V ADAPTOR is out of order. YES Is the S5V and S3.3V, AD3.3V output NO Power supply circuit available at Pin12(S5V) and Pin13 which generates S5V (S3.3V) of J303 and at Pin6 of J190 and S3V and AD3.3V in (PH connector)? the PWB-SUB(SET) is S5V S3.3V AD3.3V CN J303 J303 J190 Pin No. 12 13 6 YES IC300 and peripheral circuits are out of order.(PWB-MAIN) Voltage 5Vdc 3.3Vdc 3.3Vdc out of order. MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 (2)Flashing in green. Is the back-light on? NO Is the following harness connected? NO Poor harness connection. -Between PWB-SUB(SET) and INVERTER (J821-INVERTER) -Between back-lights and INVERTER YES Is the INV-SW output 5V-level NO at Pin12 of the J821 connector? IC300 and peripheral circuits are out of order.(PWB-MAIN) (PH connector) YES Is the BRIGHT output about 5V level at Pin14 of the J821 connector? (PH connector) YES Inverter or back-light of LCDpanel are out of order. YES Skip to “2. No picture displayed and picture errors.” (3)Flashing in Amber. If POWER switch is NO pushed, does LED become green? YES Skip to the above-mentioned “(2) Flashing in green” . IC300 and peripheral circuits are out of order.(PWB-MAIN) NO IC300 and peripheral circuits are out of order.(PWB-MAIN) 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? YES NO Is the power plug connected NO Poor power plug connection. to the wall outlet correctly? YES · To “Flashing in green”(2) · To “Flashing in amber”(3) Is all harness connected All harness connects correctly? correctly. YES NO Is the 24V and 8.5V output Is the IN_24V output available at Pin2(8.5V) and 3Vdc at Pin8(24V) of the J810 Pins 4, 6(24V) of the J810 connector? (VH connector) connector? (VH connector)? If not outputting, IC300 or its 8.5V 24V Pin No. 2 4, 6 Periphral circuits is out of Voltage 8.5Vdc 24Vdc order.(PWB-MAIN) If outputting, Power unit is * Voltage range of 8.5V :8.1~8.8V out of order. * Voltage range of 24V :22~26V YES Is the S5V and S3.3V, AD3.3V output NO Power supply circuit available at Pin12(S5V) and Pin13 which generates S5V (S3.3V) of J303 and at Pin6 of J190 and S3V and AD3.3V in (PH connector)? the PWB-SUB(SET) is S5V S3.3V AD3.3V CN J303 J303 J190 Pin No. 12 13 6 Voltage 5Vdc 3.3Vdc 3.3Vdc YES IC300 and peripheral circuits are out of order.(PWB-MAIN) out of order. MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 (2)Flashing in green. Is the back-light on? NO YES Is the following two harness NO Poor harness connection. connected? -Between PWB-SUB(SET) and INVERTER (J821-INVERTER) (J820-INVERTER) -Between back-lights and INVERTER YES Is the INV-SW output 5V-level NO at each Pin12 of the J821 and IC300 and peripheral circuits are out of order.(PWB-MAIN) J820 connector? (PH connector) YES Is the BRIGHT output about 12V level at each Pin14 of the J821 and J820 connector? (PH connector) * Voltage range : 10~14V YES Inverter or back-light of LCDpanel are out of order. Skip to “2. No picture displayed and picture errors.” (3)Flashing in Amber. If POWER switch is NO pushed, does LED become green? YES Skip to the above-mentioned “(2) Flashing in green” . IC300 and peripheral circuits are out of order.(PWB-MAIN) NO IC300 and peripheral circuits are out of order.(PWB-MAIN) 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. TV Component1 Component2 DVI Input1 Input2 PC 2-1. No picture displayed and picture errors of PC signal. Enter an input of WXGA(60Hz) gray scale 0.7Vp-p 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. Is all harness connected correctly? (especially between PWB-MAIN NO Poor harness connection or defective cable. and LCD PANEL (J4A0-LCD)) YES Is OSD available? YES NO Problem is in IC300 or IC4A0 or IC4A1 Problem is in the following (and peripheral circuits). Are the circuit (and peripheral specified voltages available at the circuits) . Voltage with problem connectors below? CN Pin No. Name S5V J303 12 S3.3V J303 13 D3.3V J190 7 Psave1* J712 5 * control signal of D3.3V YES 2-1-1 (P*) NO 2-1-2 (P*) Voltage 5Vdc 3.3Vdc 3.3Vdc 3.3Vdc S5V S3.3V D3.3V Psave1 PWB including the circuit in problem SET(SUB) SET(SUB) SET(SUB) MAIN 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) NO 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. (PWB- 31(CLK : R4H3) and 30(DE : R4H4) of IC4A1 ? MAIN) 14 of IC4A1 (MSB of Green) 3Vp-p 27 of IC4A1 (f=48KHz) 28 of IC4A1 (f=60Hz) H 3Vp-p V 3Vp-p 31 of IC4A1 (f=70MHz) 3Vp-p 30 of IC4A1 (f=48KHz) 3Vp-p YES LCD-module or IC4A1(PWB-MAIN) are out of order. NO Problem is in IC2A3 or IC400 When the shown voltage is in (and peripheral circuits). Are the problem, PWB including the power specified voltages available at the supply circuit(and peripheral connectors below? CN Name AD3.3V J190 D1.9V L400 circuits) is the following. Voltage with PWB including problem the circuit in problem AD3.3V SET(SUB) D1.9V MAIN Pin No. Voltage 6 - 3.3Vdc 1.9Vdc YES IC2A3 or IC400 (and peripheral circuits) are out of order.(PWB-MAIN) 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 of COMPONENT2) And then, perform AV reset by front switch. The video level inputs about 1.0Vp-p. Is all harness connected correctly? NO Poor harness connection or defective cable. (especially between PWB-MAIN and LCD PANEL (J4A0-LCD)) YES Is OSD available? YES NO Problem is in IC300 or IC4A0 or IC4A1 NO Problem is in the following (and peripheral circuits). Are the circuit (and peripheral specified voltages available at the circuits) . Voltage with problem connectors below? CN Pin No. Name S5V J303 12 S3.3V J303 13 D3.3V J190 7 Psave1* J712 5 *control signal of D3.3V YES Voltage 5Vdc 3.3Vdc 3.3Vdc 3.3Vdc Is the digital video signal available at pin 14(G_7) S5V S3.3V D3.3V Psave1 NO PWB including the circuit in problem SET(SUB) SET(SUB) SET(SUB) MAIN 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. (PWB- 31(CLK : R4H3) and 30(DE : R4H4) of IC4A1 ? MAIN) 14 of IC4A1 (MSB of Green) 3Vp-p 27 of IC4A1 (f=48KHz) 28 of IC4A1 (f=60Hz) H V 3Vp-p 3Vp-p 31 of IC4A1 (f=70MHz) 3Vp-p 30 of IC4A1 (f=48KHz) YES 3Vp-p LCD-module or IC4A1 (PWB-MAIN) are out of order. MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 2-2-1(P*) 2-2-1 (P*) NO 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 supply circuit(and peripheral connectors below? CN Name A5V J190 A3.3V J190 D2.5V J190 D1.9V L400 AD3.3V J190 YES circuits) is the following. Voltage with PWB including problem the circuit in problem A5V SET(SUB) A3.3V SET(SUB) D2.5V SET(SUB) D1.9V MAIN AD3.3V SET(SUB) Pin No. Voltage 1 5 8 6 5Vdc 3.3Vdc 2.5Vdc 1.9Vdc 3.3Vdc IC204 or IC201 orIC205 or IC500 or IC400 (and peripheral circuits) are out of order.(PWB-MAIN) 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 And then, perform AV reset by front switch. The video level inputs above 0.7Vp-p. Is all harness connected correctly? NO (especially between PWB-MAIN Poor harness connection or defective cable. and LCD PANEL (J4A0-LCD)) YES Is OSD available? YES NO Problem is in IC300 or IC4A0 or IC4A1 NO Problem is in the following (and peripheral circuits). Are the circuit (and peripheral specified voltages available at the circuits) . Voltage with problem connectors below? CN Pin No. Name S5V J303 12 S3.3V J303 13 D3.3V J190 7 Psave1* J712 5 *control signal of D3.3V YES Voltage 5Vdc 3.3Vdc 3.3Vdc 3.3Vdc Is the digital video signal available at pin 14(G_7) S5V S3.3V D3.3V Psave1 NO PWB including the circuit in problem SET(SUB) SET(SUB) SET(SUB) MAIN 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. (PWB- 31(CLK : R4H3) and 30(DE : R4H4) of IC4A1 ? MAIN) 14 of IC4A1 (MSB of Green) 3Vp-p 27 of IC4A1 (f=48KHz) 28 of IC4A1 (f=60Hz) H V 3Vp-p 3Vp-p 31 of IC4A1 (f=70MHz) 3Vp-p YES LCD-module or IC4A1 30 of IC4A1 3Vp-p (PWB-MAIN) are out of order. MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 2-3-1 (P*) (f=48KHz) 2-3-1 (P*) Problem is in IC2J1 or IC201 or IC205 or NO When the shown voltage is in IC500 or IC400 (and peripheral circuits). problem, PWB including the power Are the specified voltages available at the supply circuit(and peripheral connectors below? CN Name A5V J190 A3.3V J190 D2.5V J190 D1.9V L400 AD3.3V J190 YES circuits) is the following. Voltage with PWB including problem the circuit in problem A5V SET(SUB) A3.3V SET(SUB) D2.5V SET(SUB) D1.9V MAIN AD3.3V SET(SUB) Pin No. Voltage 1 5 8 6 5Vdc 3.3Vdc 2.5Vdc 1.9Vdc 3.3Vdc IC2J1 or IC201 or IC205 or IC500 or IC400(and peripheral circuits) are out of order. (PWB-MAIN) 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 4 times in case of VIDEO2) And then, perform AV reset by front switch. The video level inputs about 1.0Vp-p. Is all harness connected correctly? NO (especially between PWB-MAIN Poor harness connection or defective cable. and LCD PANEL (J4A0-LCD)) YES Is OSD available? YES NO Problem is in IC300 or IC4A0 or IC4A1 NO Problem is in the following (and peripheral circuits). Are the circuit (and peripheral specified voltages available at the circuits) . Voltage with problem connectors below? CN Pin No. Name S5V J303 12 S3.3V J303 13 D3.3V J190 7 Psave1* J712 5 *control signal of D3.3V YES Voltage 5Vdc 3.3Vdc 3.3Vdc 3.3Vdc S5V S3.3V D3.3V Psave1 PWB including the circuit in problem SET(SUB) SET(SUB) SET(SUB) MAIN 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. (PWB- 31(CLK : R4H3) and 30(DE : R4H4) of IC4A1 ? MAIN) 14 of IC4A1 (MSB of Green) 3Vp-p 27 of IC4A1 (f=48KHz) 28 of IC4A1 (f=60Hz) H V 3Vp-p 3Vp-p 31 of IC4A1 (f=70MHz) 3Vp-p YES LCD-module or IC4A1 30 of IC4A1 3Vp-p (PWB-MAIN) are out of order. MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 2-4-1 (P*) (f=48KHz) 2-4-1 (P*) YES NO 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 supply circuit (and peripheral connectors below? CN Name A9V J190 A1.5V IC600 D1.5V IC600 A3.3V J190 D2.5V J190 D1.9V L400 AD3.3V J190 YES circuits) is the following. Pin No. Voltage 10 3 3 5 8 6 9Vdc 1.5Vdc 1.5Vdc 3.3Vdc 2.5Vdc 1.9Vdc 3.3Vdc Voltage with problem A9V A1.5V D1.5V A3.3V D2.5V D1.9V AD3.3V 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 IC701 or IC702 (PWBSET(SUB)) are out of order. 1.0Vp-p YES IC100 or IC601 or IC500 or IC400(and peripheral circuits) are out of order.(PWB-MAIN) NO PWB including the circuit in problem SET(SUB) MAIN MAIN SET(SUB) SET(SUB) MAIN SET(SUB) 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 setup. Adjust the channel of TV with the channel of a signal source.) And then, perform AV reset by front switch. Is all harness connected correctly? NO Poor harness connection or defective cable. (especially between PWB-MAIN and LCD PANEL (J4A0-LCD)) YES Is OSD available? YES NO Problem is in IC300 or IC4A0 or IC4A1 NO Problem is in the following (and peripheral circuits). Are the circuit (and peripheral specified voltages available at the circuits) . Voltage with problem connectors below? S5V S3.3V D3.3V Psave1* CN Name J303 J303 J190 J712 Pin No. Voltage 12 13 7 5 5Vdc 3.3Vdc 3.3Vdc 3.3Vdc S5V S3.3V D3.3V Psave1 PWB including the circuit in problem SET(SUB) SET(SUB) SET(SUB) MAIN YES 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. (PWB- 31(CLK : R4H3) and 30(DE : R4H4) of IC4A1 ? MAIN) 14 of IC4A1 (MSB of Green) 3Vp-p 27 of IC4A1 (f=48KHz) 28 of IC4A1 (f=60Hz) H V 3Vp-p 3Vp-p 31 of IC4A1 (f=70MHz) 30 of IC4A1 (f=48KHz) 3Vp-p YES LCD-module or IC4A1 (PWB-MAIN) are out of order. 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 NO When the shown voltage is in IC400 (and peripheral circuits). problem, PWB including the power Are the specified voltages available at the supply circuit (and peripheral connectors below? CN Name 30V IC180 A9V J190 A1.5V IC600 D1.5V IC600 A3.3V J190 D2.5V J190 D1.9V L400 AD3.3V J190 YES circuits) is the following. Voltage with PWB including problem 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) Pin No. Voltage 7 10 3 3 5 8 6 30Vdc 9Vdc 1.5Vdc 1.5Vdc 3.3Vdc 2.5Vdc 1.9Vdc 3.3Vdc TU1A0 or IC100 or IC601 or IC500 or IC400 (and peripheral circuits) are out of order. (PWB-MAIN) 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. Volume level is not 0. And MUTE is off. NO Raise volume level. And MUTE is turned off. YES NO Is “TV speakers” setting on? “TV speakers” setting is on. YES In case of TV input, is “Listen To:” setting set NO to Stereo or Mono? “Listen To :” setting is set to Stereo or Mono. YES Is voltage the same before and behind F870 NO It replaces the PWB-SET(SUB). (Fuse have blown out. ) and F880? YES Are the specified voltages available at the pins below? (Power source check) CN Pin No. Name S5V J303 12 A5V J8A0 1 A9V J8A0 10 A8V C733 AMPVCC IC711 1 SAMPVCC IC712 1 Psave2* Psave3** J712 J712 6 7 Problem is in the following circuit (and peripheral Voltage 5Vdc 5Vdc 9Vdc 8Vdc 7~9Vdc 8~12V dc 3Vdc 3Vdc *control signal of A9V, A8V, A5V ** control signal of AMPVCC, SAMPVCC YES NO circuits) . Voltage with problem S5V A5V A9V A8V AMPVCC SAMPVCC Psave2 Psave3 PWB including the circuit in problem SET(SUB) SET(SUB) SET(SUB) SET(SUB) SET(SUB) SET(SUB) MAIN MAIN MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 3-A (P*) 3-A (P*) YES Is the signal below available at pins 5, 6 of NO J711 (control signals of IC701 and IC710 and IC300 (and peripheral circuits) are out of order.(PWB-MAIN) IC100 ) and 10 of J711 (control signals of IC710) and 28, 31 of IC300 (control signals of TU1A0) ? 5, 6 of J711, v 3Vp-p 28, 31 of IC300 10 of J711 3Vdc YES 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 IC701 and IC710 and IC711 and IC712 (and peripheral circuits) are out of order. (PWB-MAIN) NO IC100 (and peripheral circuits) are out of order.(PWB- SET(SUB)) 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 NO Load the batteries, making sure the polarities (-) and (+) are correct. it loaded correctly? YES Regarding as the slide switch at the top of NO It sets the slide switch as “TV”. the remote, does it set as “TV”? YES NO Does it use within 20 feet? YES It does not operate, even if it exchanges for NO it uses within 20 feet. It exchanges on new batteries. new batteries. YES When it pushes the remote switch, is the NO signal below available at pins 1, 2, of J301 PWB (and peripheral circuits). Pin with PWB problem including the circuit in problem 2 of J301 CONT 1 of J301 MAIN (remote switch use) ? 2: 3Vp-p 1 3Vdc Problem is in the following YES Skip to “4-2 front switch is not effective”. 4-2. Front switch is not effective. Is the following harness connected correctly? NO Poor harness connection or defective cable. · Between PWB-MAIN and PWB-CONT (J301-J0A1) 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) ? 4, 5 : 3Vp-p only when switch is not pushed. 0V only when switch is pushed. 1 3Vdc NO Problem is in the following PWB (and peripheral circuits). Pin with PWB problem including the circuit in problem 4, 5 of J301 CONT 1 of J301 MAIN YES IC300 (and peripheral circuits) are out of order.(PWB-MAIN) MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 Part Number 7A930032 25327981 08LA10AE 25327921 25327971 7A081023 25435861 25435911 25435851 25435881 25435871 3A684043 3A681009 PWB-CONTROL LT2220 8BL61M12 PWB-SUB LT2220 PWB-TUNER LT2220 7A930037 3A290003 7A930033 25261691 7A930029 7A930030 LT-2220 PARTS LIST Description AC-ADAPTER (SEB150P2-20.0B) BACK-UNIT (CABINET-BACK LT2220/2240) BEZEL (INCLUDES INNER BEZEL & PLATE) BEZEL-INNER (LC-T2220) BEZEL-UNIT (LC-T2220 GRY) CORD-POWER (1.9M 2P BLK) COVER-LEFT COVER-REAR (CLEAR) COVER-RIGHT COVER-TERMINAL LEFT COVER-TERMINAL RIGHT LCD (AA220TA01) T/A REQUIRED LED (SML78420C) PWB-CONTROL/LED T/A REQUIRED PWB-MAIN (LT-2220) T/A REQUIRED PWB-SUB T/A REQUIRED PWB-TUNER T/A REQUIRED REMOTE(EUR7616Z20/Z2A) REMOTE-RECEIVER (GP1UD263XK) SPEAKER-UNIT(ST-220-1) STAND-UNIT (GREY) TUNER (115V VF045AR) UNIT-INVERTER (J191007.00) Part Number 7A930032 25327981 08LA10AE 25327973 79PQ6640 25435861 25435911 25435851 25435881 25435871 3A684064 3A681009 PWB-CONTROL LT2240 8BL63M15 PWB-SUB LT2240 PWB-TUNER LT2240 79PQ6596 3A290003 7A930033 25261691 7A930029 79PQ6630 LT-2240 PARTS LIST Description AC-ADAPTER (SEB150P2-20.0B) BACK-UNIT (CABINET-BACK LT2220/2240) BEZEL (INCLUDES INNER BEZEL & PLATE) BEZEL-UNIT (LC-T2240 GRY) CORD-POWER (1.9M 2P BLK) COVER-LEFT COVER-REAR (CLEAR) COVER-RIGHT COVER-TERMINAL LEFT COVER-TERMINAL RIGHT LCD (LC56XWC8V-02) T/A REQ LED (SML78420C) PWB-CONTROL/LED T/A REQUIRED PWB-MAIN (LT-2240) T/A REQUIRED PWB-SUB T/A REQUIRED PWB-TUNER REMOTE REMOTE-RECEIVER (GP1UD263XK) SPEAKER-UNIT(ST-220-1) STAND-UNIT (GREY) TUNER (115V VF045AR) UNIT-INVERTER (J191007.01) Part Number 25327961 08LB10AE 25327891 7A081022 25435841 25435861 25435831 25435851 25435881 25435871 25327951 3A684029-M 3A681009 25620101 7A930031 PWB-CONTROL LT3020 8BL71M12 PWB-SUB LT3020 PWB-TUNER LT3020 7A930037 3A290003 7A930034 25261681 7A930029 LT-3020 PARTS LIST Description BACK-UNIT BEZEL (INCLUDES INNER BEZEL & PLATE) BEZEL-INNER (LC-T3020) CORD-POWER (2.0M 2P BLK) COVER-CORD COVER-LEFT COVER-REAR COVER-RIGHT COVER-TERMINAL LEFT COVER-TERMINAL RIGHT FRONT-CABINET (W/BUTTONS LT-3020) LCD (LC300W01 A3 LGPL) T/A REQ LED (SML78420C) PLATE (COSMETIC LC-T3020) POWER-UNIT (HS210N2J)(T/A REQ) PWB-CONTROL/LED T/A REQUIRED PWB-MAIN (LT-3020) T/A REQUIRED PWB-SUB T/A REQUIRED PWB-TUNER T/A REQUIRED REMOTE(EUR7616Z20/Z2A) REMOTE-RECEIVER (GP1UD263XK) SPEAKER-UNIT(ST-300-1) STAND-UNIT (GREY) TUNER (115V VF045AR) Part Number 25327961 08LB10AE 25327952 7A392043 79PQ6612 25435841 25435861 25435831 25435851 25435881 25435921 3A684029-M 3A681009 7A930031 PWB-CONTROL LT3040 8BL73M15 PWB-SUB LT3040 PWB-TUNER LT3040 79PQ6596 3A290003 7A930034 25261681 7A930029 LT-3040 PARTS LIST Description BACK-UNIT BEZEL (INCLUDES INNER BEZEL & PLATE) BEZEL-UNIT CABLE-ANT(BLACK RF-RF) CORD-POWER(2.0M 2P BLK) COVER-CORD COVER-LEFT COVER-REAR COVER-RIGHT COVER-TERMINAL LEFT COVER-TERMINAL RIGHT LCD (LC300W01 A3 LGPL) T/A REQ LED (SML78420C) POWER-UNIT (HS210N2J)(T/A REQ) PWB-CONTROL/LED T/A REQUIRED PWB-MAIN (LT-3040) T/A REQUIRED PWB-SUB T/A REQUIRED PWB-TUNER T/A REQUIRED REMOTE REMOTE-RECEIVER (GP1UD263XK) SPEAKER-UNIT(ST-300-1) STAND-UNIT (GREY) TUNER (115V VF045AR) Page 54 MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050 Part Number 08LB20AE 3A684029-M 8BL72M15 25327961 25327952 7A392043 79PQ6612 25435841 25435861 25435831 25435851 25435881 25435921 3A681009 7A930031 PWB-CONTROL LT3050 PWB-SUB LT3050 PWB-TUNER LT3050 79PQ6618 3A290003 7A930034 25261681 7A930029 LT-3050 PARTS LIST Description BEZEL (INCLUDES INNER BEZEL & PLATE) LCD (LC300W01 A3 LGPL) T/A REQ PWB-MAIN (LT-3050) T/A REQUIRED BACK-UNIT BEZEL-UNIT CABLE-ANT(BLACK RF-RF) CORD-POWER(2.0M 2P BLK) COVER-CORD COVER-LEFT COVER-REAR COVER-RIGHT COVER-TERMINAL LEFT COVER-TERMINAL RIGHT LED (SML78420C) POWER-UNIT (HS210N2J)(T/A REQ) PWB-CONTROL/LED T/A REQUIRED PWB-SUB T/A REQUIRED PWB-TUNER T/A REQUIRED REMOTE REMOTE-RECEIVER (GP1UD263XK) SPEAKER-UNIT(ST-300-1) STAND-UNIT (GREY) TUNER (115V VF045AR) Page 55
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