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SERVICE MANUAL

Depending on the production period, there are two types of product for this model.

This Service Manual is for the LT850-M32 (A0CF0EP) model.
For the LT850-M32 (A0CF0EP) model, the letter (A0CF0EP) is printed on
the Serial Number Label on the back of the unit. Refer to the Serial
Number Label below.

TYPE A (JUNCTION CBA is used.)

TYPE B (JUNCTION CBA is not used.)

Serial No. Label

"A0CF0EP"

″

COLOR LCD TELEVISION

LT850-M32

Содержание LT850-M32 - SERVICE

Страница 1: ...anual is for the LT850 M32 A0CF0EP model For the LT850 M32 A0CF0EP model the letter A0CF0EP is printed on the Serial Number Label on the back of the unit Refer to the Serial Number Label below TYPE A...

Страница 2: ...e LCD Television 6 1 Firmware Renewal Mode 7 1 Troubleshooting 8 1 Block Diagrams 9 1 Schematic Diagrams CBA and Test Points 10 1 Waveforms 11 1 Wiring Diagram 12 1 Exploded View 13 1 Mechanical Parts...

Страница 3: ...Nominal Limit 1 RECEIVED FREQ RANGE 60dBm 45ch 1 2 kHz kHz 1000 900 500 167 2 INPUT DYNAMIC RANGE mix max c 1 VHF HIGH 8ch UHF 45ch dBuV dBuV 25 101 25 101 28 98 29 98 d 2 VHF HIGH 8ch UHF 45ch dBuV d...

Страница 4: ...htly below these specifications Limit specifications represent the absolute worst condition that still might be considered acceptable In no case should a unit fail to meet limit specifications Descrip...

Страница 5: ...terminal screw and if applicable to the coaxial connector If the measured resistance is less than 1 0 megohm or greater than 5 2 megohm an abnormality exists that must be corrected before the instrum...

Страница 6: ...near thermally hot parts be sure that leads and components do not touch thermally hot parts c the AC supply d high voltage and e antenna wiring Always inspect in all areas for pinched out of place or...

Страница 7: ...PVC tubing 3 Spacers 4 Insulators for transistors E When replacing AC primary side components transformers power cord etc wrap ends of wires securely about the terminals before soldering F Observe tha...

Страница 8: ...and externally exposed accessible parts RF terminals an tenna terminals video and audio input and output ter minals microphone jacks earphone jacks etc Measuring Method Power ON Insert load Z between...

Страница 9: ...the flat pack IC is fixed with glue to the CBA when removing entire flat pack IC first apply soldering iron to center of the flat pack IC and heat up Then remove glue will be melted Fig S 1 6 4 Relea...

Страница 10: ...ins of the flat pack IC you can remove it easily Fig S 1 3 2 Affix the wire to a workbench or solid mounting point as shown in Fig S 1 5 3 While heating the pins using a fine tip soldering iron or hot...

Страница 11: ...occur due to a potential difference caused by electrostatic charge during unpacking or repair work 1 Ground for Human Body Be sure to wear a grounding band 1 M that is properly grounded to remove any...

Страница 12: ...Loc No Part Fig No Removal Note 1 Stand Assembly D1 4 S 1 2 Rear Cabinet D1 13 S 2 2 S 3 3 S 4 S 5 3 Inverter CBA D2 D5 6 S 6 CN1001 CN1003 CN1050 CN1100 CN1150 CN1200 CN1900 4 Tuner Shield D2 2 S 7...

Страница 13: ...4 2 A0CF0DC_rev 2 Rear Cabinet 1 Stand Assembly S 4 S 4 S 2 S 3 S 2 S 2 S 2 S 1 S 5 Fig D1...

Страница 14: ...Tuner Shield 6 Jack Holder 5 Power Supply CBA 8 Digital Main CBA Unit 3 Inverter CBA S 8 S 8 S 9 H 1 S 7 S 11 S 10 S 10 S 12 S 12 S 12A S 8 Jack Holder HP 7 Shield Box Fig D2 S 14 S 13 9 Power SW CBA...

Страница 15: ...0DC_rev S 17 S 16 S 15 Hook S 18 16 LCD Module Assembly 14 IR Sensor CBA 15 Function CBA 11 Speaker Holder R 11 Speaker Holder L 13 Junction CBA 12 Speaker 17 Front Cabinet S 15 Hook 12 Speaker TYPE A...

Страница 16: ...in CBA Unit CN1900 Inverter CBA CN801 CN101 AC Cord CN3704 CN3401 CN3702 CN3703 CN3701 CN3901 CN401 CN404 CN403 CN402 CN802 CN600 CL102A Junction CBA POWER SW CBA Function CBA CN1901 CL103B IR Sensor...

Страница 17: ...stments unless the proper equipment is available Test Equipment Required 1 NTSC Pattern Generator Color Bar W White Window Red Color Dot Pattern Gray Scale Monoscope Multi Burst 2 Remote control unit...

Страница 18: ...e 3 Enter the Service mode 4 To enter the VCOM 2 adjustment mode press 3 button on the remote control unit To enter the VCOM 1 adjustment mode press 2 button on the remote control unit 5 Press P butto...

Страница 19: ...select C D mode 5 CUTOFF Press 1 button to select COR for Red Cutoff adjustment Press 3 button to select COB for Blue Cutoff adjustment DRIVE Press 4 button to select DR for Red Drive adjustment Pres...

Страница 20: ...the service mode Refer to page 5 1 To cancel the service mode press button on the remote control unit 3 Press button on the remote control unit to initialize the LCD television 4 INITIALIZED will app...

Страница 21: ...h digit of the file name indicate the size of TV If the size of your TV and the file name were not the same you must change the file name Update procedure 1 Plug in the AC power cord 2 Press button on...

Страница 22: ...t and service it if defective Check the presence that the primary component is leaking or shorted and service it if defective Check the presence that the rectifying diode or circuit is shorted in each...

Страница 23: ...approximately 6V voltage supplied to the base of Q518 AL 3 3V is not output FLOW CHART NO 6 Yes No Is approximately 6V voltage supplied to the collector of Q521 Check D525 C516 and their periphery ci...

Страница 24: ...e base of Q509 Yes Is approximately 17V voltage supplied to the base of Q503 No Check Q504 Q505 D506 D507 P ON H1 line and their periphery circuit and service it if defective LCD 24V is not output FLO...

Страница 25: ...nd service it if defective Check the composite video signal line and service it if defective Check the component video Y Pb Pr signal line and service it if defective Check the line between each pin o...

Страница 26: ...utted normally Audio input terminals FLOW CHART NO 16 Check the line between Pin 16 18 of CN403 and Pin 4 5 of TU1 and TU1 Tuner Unit and service it if defective Are the DIF signals outputted to Pin 1...

Страница 27: ...4 4 PROTECT3 4 4 VCOM PWM 2 2 BACKLIGHT SW 1 1 BACKLIGHT ADJ KEY IN1 11 11 P ON H1 1 1 REMOTE 13 13 LED1 14 14 P ON H2 2 2 POWER LED 4 3 REMOTE 2 5 STANDBY LED 5 2 KEY IN1 6 1 POWER LED 4 4 REMOTE 2...

Страница 28: ...IN 29 29 S VIDEO Y IN 27 27 COM VIDEO Y IN 4 4 COM VIDEO Pb IN 6 6 COM VIDEO Pr IN 8 8 VIDEO OUT 15 BUFFER Q011 TU CVBS 29 29 TU CVBS TU1 DIF OUT2 4 DIF OUT1 5 TUNER UNIT IF AGC 6 CN403 CN3703 DIF OUT...

Страница 29: ...R OUT 8 8 AUDIO MUTE 12 12 WF7 RGB AUDIO L OUT 6 6 RGB AUDIO R OUT 7 7 RGB AUDIO L OUT2 12 12 RGB AUDIO R OUT2 13 13 20 IC803 AUDIO AMP 1 44 9 10 13 14 35 36 31 32 MUTE CONTROL CN802 CL802 SP802 SPEA...

Страница 30: ...A2 AF10 AE11 TMDS CLOCK TMDS CLOCK DEMODULATOR MPEG DECODER DEMODU ADC DAC AUDIO I F RDQ 0 31 MRA 0 12 IC3201 IC3202 DDR2 SDRAM Q3302 Q3301 HDMI I F HDMI IN3 7 9 4 6 1 3 10 12 16 15 JK3702 TMDS D0 TM...

Страница 31: ...1932 IC1000 PWM CONTROL BACK LIGHT 1 2 1 2 1 2 CN1100 CN1150 CN1200 BACK LIGHT BACK LIGHT T1100 Q1551 Q1552 Q1553 Q1003 Q1600 Q1065 Q1115 Q1165 Q1500 Q1801 Q1802 Q1803 Q1804 Q1800 Q1815 Q1004 Q1005 Q1...

Страница 32: ...C607 T601 TO INVERTER BLOCK DIAGRAM CN1900 CN600 CN601 CN701 2 HOT GND 1 ACL 2 LINE FILTER L601 L602 AC701 AC CORD BRIDGE RECTIFIER D609 D612 4 3 16 15 10 14 9 13 12 11 6 7 FEED BACK Q601 SWITCHING Q5...

Страница 33: ...itute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock fire or other hazards Notes 1 Do not use the part number shown on these drawing...

Страница 34: ...ed 2 To maintain original function and reliability of repaired units use only original replacement parts which are listed with their part numbers in the parts list section of the service manual 4 Volt...

Страница 35: ...ge selectable power supply circuit is used in this unit If Main Fuse F601 is blown check to see that all components in the power supply circuit are not defective before you connect the AC plug to the...

Страница 36: ...10 4 A0CF0SCP2 Power Supply 2 Schematic Diagram...

Страница 37: ...10 5 A0CF0SCP3 Power Supply 3 Schematic Diagram...

Страница 38: ...10 6 A0CF0INV Inverter Schematic Diagram NOTE The voltage for parts in hot circuit is measured using hot GND as a common terminal...

Страница 39: ...10 7 A0CF0SCF Function IR SENSOR Junction Schematic Diagram...

Страница 40: ...Main 1 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into seven and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic...

Страница 41: ...Main 2 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into seven and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic...

Страница 42: ...Main 3 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into seven and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic...

Страница 43: ...Main 4 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into seven and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic...

Страница 44: ...Main 5 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into seven and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic...

Страница 45: ...Main 6 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into seven and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic...

Страница 46: ...Main 7 Schematic Diagram The order of pins shown in this diagram is different from that of actual IC3301 IC3301 is divided into seven and shown as IC3301 1 7 IC3301 7 7 in this Digital Main Schematic...

Страница 47: ...when troubleshooting this type of power supply circuit a variable isolation transformer is required CAUTION Fixed voltage or Auto voltage selectable power supply circuit is used in this unit If Main...

Страница 48: ...ansformer must be used when repairing Also in order to have the ability to increase the input slowly when troubleshooting this type of power supply circuit a variable isolation transformer is required...

Страница 49: ...CBA IR Sensor CBA Power SW CBA Junction CBA Top View BA0CF0F01021 Function CBA Junction CBA TYPE A IR Sensor CBA Inverter CBA Power SW CBA NOTE The voltage for parts in hot circuit is measured using h...

Страница 50: ...BA IR Sensor CBA Power SW CBA Junction CBA Bottom View BA0CF0F01021 Function CBA Junction CBA TYPE A IR Sensor CBA Inverter CBA Power SW CBA NOTE The voltage for parts in hot circuit is measured using...

Страница 51: ...tic Diagram S VIDEO Y S VIDEO Y 0 2V 0 2V 20 20 s S VIDEO C S VIDEO C 0 2V 0 2V 20 20 s VIDEO Y VIDEO Y 0 2V 0 2V 20 20 s 20 20 s VIDEO Pr VIDEO Pr 0 2V 0 2V 20 20 s VIDEO Pb VIDEO Pb 0 2V 0 2V 20 20...

Страница 52: ...Pin 26 of CN404 AUDIO L AUDIO L 0 5V 0 5V 0 5m 0 5ms WF7 Pin 22 of CN401 20 20 s VIDEO G VIDEO G 0 5V 0 5V 20 20 s VIDEO R VIDEO R 0 5V 0 5V 20 20 s Input PAL Color Bar Signal with 1kHz Audio Signal W...

Страница 53: ...DIF OUT2 GND GND DIF OUT1 IF AGC GND SCL GND SIF SIF GND GND TU CVBS SDA BACKLIGHT SW GND 2 2 CN3701 CN402 1 5 3 9 7 2 4 6 8 10 14 12 18 16 11 13 15 5 3 9 7 2 4 6 8 10 14 12 11 1 5 3 9 7 2 4 6 8 10 1...

Страница 54: ...or CBA Function CBA CL801 CL802 SP802 SP801 Power Supply CBA Power SW CBA B16 A6 A2 A11 Stand Assembly L6 L6 L6 L4 L6 B18 L2 L5 L1 L2 L1 L7 L3 L3 B12 B11 B11 B9 B10 S6 L6 L2 L2 L2 A4 LCD1 CL3901 CL100...

Страница 55: ...13 2 A0CF0PEX Packing S5 S3 S1 Tape Tape Packing Tape Packing Tape S2 S2 S9 S8 S7 X1 Some Ref Numbers are not in sequence L7 X2 2 S6 Stand Assembly X4 X3 FRONT FRONT X2 1...

Страница 56: ...CL801 WIRE ASSEMBLY 2PIN 2PIN 100MM RED BLACK WX1A94F0 203 CL802 WIRE ASSEMBLY 2PIN 2PIN 310MM RED BLACK WX1A0CF0 103 CL1003 WIRE ASSEMBLY 11PIN FFC 11PIN 110MM WX1A94F0 105 CL3901 WIRE ASSEMBLY 24PI...

Страница 57: ...IP 1608 J C0G 47pF 50V CHD470EYA030 C24 CHIP CERAMIC CAP 1608 CH J 100pF 50V or CHD1JJ3CH101 CAP CHIP 1608 J C0G 100pF 50V CHD101EYA030 C27 CHIP CERAMIC CAP 1608 B K 0 01 F 50V or CHD1JK30B103 CAP CHI...

Страница 58: ...1JMASDL1R0 Ref No Mark Description Part No CAP ELE 1 F 50V M 85 or CEF1R0KSN001 CAP ELE 1 F 50V M 85 CEF1R0TEP001 C420 CHIP CERAMIC CAP 1608 B K 0 1 F 16V CHD1CK30B104 C421 CHIP CERAMIC CAP 1608 CH D...

Страница 59: ...805 CHIP CERAMIC CAP 1608 B K 0 047 F 50V or CHD1JK30B473 Ref No Mark Description Part No CAP CHIP 1608 K X7R 0 047 F 50V CHD473EYA032 C806 CHIP CERAMIC CAP 1608 B K 0 047 F 50V or CHD1JK30B473 CAP CH...

Страница 60: ...ODE ZENER 5V6BSB T26 or NDTB5R6BST26 DIODE ZENER HZS5 6NB2TE EQ QDTB0HZS5R6N D302 DIODE ZENER 5V6BSB T26 or NDTB5R6BST26 DIODE ZENER HZS5 6NB2TE EQ QDTB0HZS5R6N D303 DIODE ZENER 5V6BSB T26 or NDTB5R6B...

Страница 61: ...DIODE SWITCHING HSS4148TE E or QDTZ0HSS4148 DIODE SWITCHING 1N4148 F0021 NDTZ01N4148F Ref No Mark Description Part No D536 DIODE ZENER 3V3BSB T26 or NDTB3R3BST26 DIODE ZENER HZS3 3NB2TE EQ QDTB0HZS3R3...

Страница 62: ...0 TRANSISTOR KTA1267 GR AT P or NQS1KTA1267P TRANSISTOR KTA 1266 GR AT P or NQS4KTA1266P TRANSISTOR 2SA1015 Y TE2 F T or QQSY2SA1015F TRANSISTOR 2SA1015 GR TE2 F T or QQS12SA1015F PNP TRANSISTOR 2SA19...

Страница 63: ...ISTOR 2SC1815 GR TE2 F T or QQS12SC1815F NPN TRANSISTOR 2SC5343Y AT or NQSY02SC5343 NPN TRANSISTOR 2SC5343G AT or NQSG02SC5343 Ref No Mark Description Part No NPN TRANSISTOR 2SC5343MG AT or NQSG2SC534...

Страница 64: ...RRJ153WAL002 R229 CHIP RES 1 10W J 47k or RRXAJR5Z0473 RES CHIP 1608 1 10W J 47k or RRXA473YF002 Ref No Mark Description Part No RES CHIP 1608 1 10W J 47k RRJ473WAL002 R230 CHIP RES 1 10W J 15k or RR...

Страница 65: ...1608 1 10W 0 or RRXAZR5Z0000 Ref No Mark Description Part No RES CHIP 1608 1 10W J 0 or RRXA000YF002 RES CHIP 1608 1 10W 0 RRJ000WAL002 R412 CHIP RES 1 10W J 100k or RRXAJR5Z0104 RES CHIP 1608 1 10W J...

Страница 66: ...F002 RES CHIP 1608 1 10W J 47k RRJ473WAL002 Ref No Mark Description Part No R557 RES CARBON FILM 1 4W J 10k or RCX4103FS002 RES CARBON FILM T 1 4W J 10k or RCX4103T1001 RES CARBON FILM 1 4W J 10k RCJ1...

Страница 67: ...702 RES CHIP 1608 1 10W F 27 0k RTW2702YF002 R803 CHIP RES 1 10W F 10k or RRXAFR5H1002 CHIP RES 1 10W F 10k or RRXAFR5Z1002 RES CHIP 1608 1 10W F 10 0k RTW1002YF002 R804 CHIP RES 1 10W F 10k or RRXAFR...

Страница 68: ...HD1JK30B104 CAP CHIP 1608 K X7R 0 1 F 50V CHD104EYA032 C1004 CHIP CERAMIC CAP 1608 B K 0 1 F 50V or CHD1JK30B104 CAP CHIP 1608 K X7R 0 1 F 50V CHD104EYA032 C1005 CHIP CERAMIC CAP 1608 B K 0 1 F 50V or...

Страница 69: ...D104EYA032 C1905 SAFTY CAP 2200pF 250V KX or CA2E222MR101 SAFETY CAP 2200pF 250V M CCN2HMN0E222 C1910 CAP ELECTROLYTIC 150 F 400V M 25 30 or CA2H151DYG18 CAP ELE 85 150 F 400V M85_22X35 or CEN151KSN00...

Страница 70: ...Z01N4148F D1164 SWITCHING DIODE 1SS133 T 77 or QDTZ001SS133 DIODE SWITCHING HSS4148TE E or QDTZ0HSS4148 Ref No Description Part No DIODE SWITCHING 1N4148 F0021 NDTZ01N4148F D1165 SWITCHING DIODE 1SS13...

Страница 71: ...KTA1266P TRANSISTOR 2SA1015 Y TE2 F T or QQSY2SA1015F Ref No Description Part No TRANSISTOR 2SA1015 GR TE2 F T or QQS12SA1015F PNP TRANSISTOR 2SA1980Y AT or NQSY02SA1980 PNP TRANSISTOR 2SA1980 G or NQ...

Страница 72: ...F T or QQSY2SC1815F TRANSISTOR 2SC1815 GR TE2 F T or QQS12SC1815F NPN TRANSISTOR 2SC5343Y AT or NQSY02SC5343 NPN TRANSISTOR 2SC5343G AT or NQSG02SC5343 Ref No Description Part No NPN TRANSISTOR 2SC534...

Страница 73: ...ES 1 10W J 100k or RRXAJR5Z0104 RES CHIP 1608 1 10W J 100k or RRXA104YF002 RES CHIP 1608 1 10W J 100k RRJ104WAL002 Ref No Description Part No R1061 CHIP RES 1 10W J 20k or RRXAJR5Z0203 RES CHIP 1608 1...

Страница 74: ...3k or RRXAJR5Z0332 RES CHIP 1608 1 10W J 3 3k or RRXA332YF002 Ref No Description Part No RES CHIP 1608 1 10W J 3 3k RRJ332WAL002 R1800 CHIP RES 1 10W J 10k or RRXAJR5Z0103 RES CHIP 1608 1 10W J 10k or...

Страница 75: ...S CHIP 1608 1 10W F 6 80k RTW6801YF002 R1980 CHIP RES 1 10W F 360 or RRXAFR5H3600 CHIP RES 1 10W F 360 or RRXAFR5Z3600 RES CHIP 1608 1 10W F 360 RTW3600YF002 Ref No Description Part No R1981 CHIP RES...

Страница 76: ...M 85 H7 CEC470KSN003 C115 CHIP CERAMIC CAP CH J 330pF 50V CHD1JJ3CH331 DIODES D104 LED GREEN 333GT E FNA or NPWZ33GTEFNA LED GREEN LTL 4234 NPWZ0LTL4234 D105 LED L 53HT or NP4Z000L53HT LED 333HT E L...

Страница 77: ...LT850 M32 A0CF0EP 2011 05 31 Ver 2...

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