Mitsubishi Electric LT-2220 Service Manual Download | Manualshive

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3. BACK UNIT

4. BACK COVER

DISASSEMBLY PROCEDURE (LT-22XX) CONTINUED

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

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Summary of Contents for LT-2220

Page 1: ...r 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 ...

Page 2: ......

Page 3: ...t 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 INTERC...

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

Page 5: ...mponents 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 ...

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

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

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

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

Page 13: ...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: ...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: ...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: ...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: ...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: ...Page 18 DISASSEMBLY PROCEDURE LT 30XX CONTINUED 9 CHASSIS REAR MODELS LT 2220 LT 2240 LT 3020 LT 3040 LT 3050 ...

Page 19: ...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: ...Page 20 DISASSEMBLY PROCEDURE LT 30XX CONTINUED WIRING HARNESS LOCATIONS MODELS LT 2220 LT 2240 LT 3020 LT 3040 LT 3050 ...

Page 21: ...k 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 3 Set Day Sunday Brightness 31 Memory Deleted Sharpness 31 Name N A Auto Color Correction Off Color 31 SQV N A Tint 31 Magenta 31 Co...

Page 22: ...MODELS LT 2220 LT 2240 LT 3020 LT 3040 LT 3050 ...

Page 23: ...ister 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 lea...

Page 24: ...al 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 ...

Page 25: ...01 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 IC60...

Page 26: ...ishi 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...

Page 27: ...rat2 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...

Page 28: ...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...

Page 29: ... B8H 3 3V IIC H V DE CLK R G B Y Cb Pb Cr Pr 18 432 MHz 5V IIC IC201 SW SM5301 5V CVBS Y C RSTB SYNC H V CLK 24 576 MHz MUXSEL CTL BUS TU IIC 3 3V IIC IC305 OPAMP LMV324 5V Volume 1 2 VRF IC490 20MHz PC_H V RESETQ SW LED Analog RGB YPbPr YCbCr IC203 SW 74LV157 3 3V DVI H V 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 5V IIC YUV R...

Page 30: ...al 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 DR...

Page 31: ...1 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 PC J2A1 Dsub15 Component1 2 J201 YpbPr YCbCr MONITOR LINK J2J0 TV TU1A0 TUNER 30V 5V add C0H Analog RGB TMDS Conponen...

Page 32: ...essor 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_N Speaker R Speaker Woofer Volume1 from IC300 24 Volume control for MAIN Amp Volume control for SUB Amp 0 02Vdc to 1 15Vdc AMPVCC SAMPVCC LT 2220 LT 3020 7 5V 9V 9V 12V Table Suppli...

Page 33: ...V 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 ...

Page 34: ...8X0 RS232C J705 Line Out R L J701 VIDEO1 AUDIO1 R L Y J8T1 XH3 J706 HP IC880 DC DC IC870 DC DC IC850 DC DC IC840 DC DC IC830 DC DC J801 J802 14 1 F800 12 INV SW 14 BRIGHT 16 1 1 8 10 1 13 1 12 1 5 Psave1 of C733 1 12 1 12 1 of IC712 1 of IC711 6 Psave2 7 Psave3 8 MPX 10 SW_L 12 SW_R 4 ON_24V PWB SET SUB 1 2 3 4 2 8 5V 4 24V 6 24V 5 6 7 8 12 13 11 10 9 14 15 16 5 5V_ SDA 6 5V_SCL 18 17 10 MPX_RST 1...

Page 35: ...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...

Page 36: ...P gm6015 IC601 DECODER with 3D Y C IC4A2 04 IC4A3 08 IC4A4 74 IC2A2 14 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 1 13 S3 3V 12 S5V 2 5 A3 3V 1 A5V 7 D3 3V 6 AD3 3V 10 A9V 8 D2 5V 4 7 5 3 6 14 ...

Page 37: ...able 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 Y...

Page 38: ...ollowing 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 NO YES IC300 and peripheral circuits are out of order PWB MAIN IC300 and peripheral circuits are out of order P...

Page 39: ... 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 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 ...

Page 40: ...AIN 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 NO YES IC300 and peripheral circuits are out of order PWB MAIN IC300 and periph...

Page 41: ...nnection 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 NO 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 ...

Page 42: ...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 3Vp p H V 14 of IC4A1 MSB of Green 3Vp p 31 of IC4A1 f 70MHz 3Vp p f...

Page 43: ...lem 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 avai...

Page 44: ...IN CN 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 2 2 1 P 2 2 1 P YES MODELS LT 2220 ...

Page 45: ...wing 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...

Page 46: ...N 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 2 3 1 P YES MODELS LT 2...

Page 47: ...s 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...

Page 48: ...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 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 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...

Page 49: ...llowing 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 pin...

Page 50: ...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 ...

Page 51: ...TV speakers setting is on NO YES In case of TV input is Listen To setting set to Stereo or Mono NO YES Listen To setting is set to Stereo or Mono Are the specified voltages available at the pins below Power source check NO CN 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 dc Psave2 J712 6 3Vdc Psave3 J712 7 3Vdc contr...

Page 52: ...d peripheral circuits are out of order PWB MAIN NO 3Vdc 10 of J711 YES 3 A P 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 NO 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 MODELS LT 2220 LT ...

Page 53: ...n 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 NO 3Vdc 1 4 5 YES When it pushes the remote switch is the signal belo...

Page 54: ...30029 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 79PQ...

Page 55: ... 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 SP...

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