FUNAI LT850-M26 - SERVICE Service Manual Download Page 1

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SERVICE MANUAL

This Service Manual is for the LT850-M26 (A0CA0EP) model.
For the LT850-M26 (A0CA0EP) model, the letter (A0CA0EP) is printed on
the Serial Number Label on the back of the unit. Refer to the Serial
Number Label below.

Serial No. Label

"A0CA0EP"

″

COLOR LCD TELEVISION

LT850-M26

Summary of Contents for LT850-M26 - SERVICE

Page 1: ...r the LT850 M26 A0CA0EP model For the LT850 M26 A0CA0EP model the letter A0CA0EP is printed on the Serial Number Label on the back of the unit Refer to the Serial Number Label below Serial No Label A0...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 12: ...s in the Table Step Loc No Part Removal Fig No Remove Unhook Unlock Release Unplug Unclamp Desolder Note 1 Stand Assembly D1 4 S 1 2 Rear Cabinet D1 11 S 2 2 S 3 S 4 3 Inverter CBA D2 D3 6 S 5 CN407 C...

Page 13: ...4 2 A0CA0DC 2 Rear Cabinet S 1 1 Stand Assembly S 2 S 2 S 3 S 2 S 4 S 2 S 2 S 2 Fig D1...

Page 14: ...and Holder 12 LCD Module Assembly 14 Function CBA 15 Front Cabinet 13 Speaker 6 Jack Holder 4 Tuner Shield 8 Jack Holder HP SW S 5 S 15 S 14 S 5 S 16 S 17 Shield Box Speaker Holder R S 9 S 9 S 10 H 1...

Page 15: ...y CBA Inverter CBA Function CBA To LCD Module Assembly To Speaker To Speaker CN3901 CN3701 CN402 CN403 CN404 CN401 CN202 CN3703 CN3702 CN3704 Digital Main CBA Unit To LCD Module Assembly CL900B CN1201...

Page 16: ...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...

Page 17: ...he LCD Panel surface 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 u...

Page 18: ...de 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 Press 6 button to...

Page 19: ...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...

Page 20: ...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...

Page 21: ...rcuit 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...

Page 22: ...s not output FLOW CHART NO 8 Is approximately 18V voltage supplied to the cathode of D504 No Yes Yes Check D504 D505 C503 and their periphery circuit and service it if defective Replace Q503 Is approx...

Page 23: ...their periphery circuit and service it if defective No P ON 9V is not output FLOW CHART NO 12 Yes No Is approximately 12V voltage supplied to the collector of Q517 Is approximately 10V voltage suppli...

Page 24: ...periphery circuit and service it if defective Check D539 D540 C522 and their periphery circuit and service it if defective Check Q508 Q520 D541 D542 P ON H2 line and their periphery circuit and servic...

Page 25: ...is not outputted normally Audio input terminals FLOW CHART NO 19 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 output...

Page 26: ...5 5 PROTECT1 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 PROTECT3 1 BACKLIGHT SW 2 BACKLIGHT ADJ 3 10 VCOM Q182 C25 IC33...

Page 27: ...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 Q11 TU CVBS 29 29 TU CVBS TU1 DIF OUT2 4 DIF OUT1 5 TUNER UNIT IF AGC 6 CN403 CN3703 DIF OUT...

Page 28: ...CN403 AMP L OUT 10 10 AMP 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 CONTR...

Page 29: ...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...

Page 30: ...B Q1101 T1203 INVERTER CONTROL LOGIC DRIVE1 VDDA DRIVE2 Q1102 Q1112 Q1113 9 10 13 14 11 16 1 6 8 Q1012 Q1009 Q1006 LCD MODULE ASSEMBLY T1201 BACK LIGHT 1 2 CN1201 TO SYSTEM CONTROL BLOCK DIAGRAM CN407...

Page 31: ...CN601 AC1 AC CORD 16 15 10 14 9 13 11 FEED BACK Q512 Q513 CN406 CN402 CN407 CL900B CN3701 Q504 Q505 SWITCHING Q509 SW 7V Q503 D506 SW 12 5V Q516 Q514 Q511 Q508 Q518 SW 5V Q521 D522 Q517 SW 9V Q510 D52...

Page 32: ...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...

Page 33: ...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...

Page 34: ...10 3 A0CA0SCP1 Power Supply 1 Schematic Diagram NOTE The voltage for parts in hot circuit is measured using hot GND as a common terminal...

Page 35: ...10 4 A0CA0SCP2 Power Supply 2 Schematic Diagram...

Page 36: ...10 5 A0CA0SCP3 Power Supply 3 Schematic Diagram...

Page 37: ...10 6 A0CA0INV Inverter Schematic Diagram...

Page 38: ...that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply Otherwise it may cause some components in the power supply circuit to fail CAUTI...

Page 39: ...10 8 A0CA0SCF Function Schematic Diagram...

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

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

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

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

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

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

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

Page 47: ...8 D639 J400 J401 J402 J403 J404 JK301 J406 JK302 J407 J408 J409 J410 J411 J412 J413 J414 J415 J416 J417 J418 R501 J419 JS401 CN101 J420 Q181 J421 J422 Q182 Q183 J423 J424 J425 J426 J427 J428 R510 JS60...

Page 48: ...2 D326 BC403 D327 D520 D521 D522 D523 D524 D525 L801 Q621 BC601 D526 L802 BC602 D527 L803 Q623 BC603 D528 L804 D529 BC607 BC608 BC609 D530 D531 D532 BC802 D533 BC803 BC610 D534 BC804 D535 BC805 D536 D...

Page 49: ...069 J1012 J1011 J1040 J1068 J1060 BA0CA0F0102 1 A C1025 J1079 JS1001 JS1002 JS1003 J1059 J1033 J1032 J1058 J1083 J1084 J1057 J1049 SW101 SW103 SW104 SW105 SW106 SW107 CL104B R108 R123 R124 R125 RS102...

Page 50: ...1 C F701 R250 COLD 11 1 C1122 C1123 R1102 R1103 IC1101 R1116 R1117 R1118 R1119 R1120 R1121 R1123 R1124 C1003 C1005 C1006 C1007 C1008 C1009 C1011 C1018 C1019 C1020 R1005 R1008 R1009 R1201 R1202 R1010...

Page 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...

Page 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...

Page 53: ...9V GND GND GND AL 3 3V P ON 3 3V GND GND P ON 3 3V GND P ON 3 3V NU P ON 3 3V NU GND AL 3 5V AL 3 5V AL 3 5V GND GND GND 26 AL 5V 27 P ON 5V 28 P ON 5V 29 25 24 26 27 28 29 26 27 28 29 26 27 28 29 26...

Page 54: ...A Power Supply CBA Stand Assembly L17 B9 B10 B10 L6 L6 A6 L6 L6 L6 L6 L6 L6 L1 L1 L1 L1 L1 L2 L10 L1 L1 L6 A4 L1 L1 B13 B4 L14 L4 A11 B1 B17 B17 B44 L4 L6 L9 L6 L2 L2 B5 B18 A3 A1 A2 L8 S6 A8 L3 L3 A1...

Page 55: ...13 2 A0CA0PEX Packing S5 S3 S1 Tape Tape Packing Tape Packing Tape S2 S7 X1 Some Ref Numbers are not in sequence L17 S6 Stand Assembly X4 X3 FRONT FRONT X2 1 X2 2 S2...

Page 56: ...N FFC 29PIN 50MM WX1A94F0 101 CL404 WIRE ASSEMBLY 29PIN FFC 29PIN 50MM WX1A94F0 101 CL406 WIRE ASSEMBLY 11PIN FFC 11PIN 90MM WX1A9170 107 CL801 WIRE ASSEMBLY 2PIN 2PIN 160MM AWG24 R B WX1A0CA0 307 CL8...

Page 57: ...1JJ3CH101 CAP CHIP 1608 J C0G 100pF 50V CHD101EYA030 C216 CHIP CERAMIC CAP CH J 330pF 50V or CHD1JJ3CH331 CAP CHIP 1608 J C0G 330pF 50V CHD331EYA030 C217 CHIP CERAMIC CAP CH J 330pF 50V or CHD1JJ3CH33...

Page 58: ...CE1AMASDL101 CAP ELE 100 F 10V M 85 or CEB101KSN001 CAP ELE 100 F 10V M 85 CEB101TEP001 Ref No Description Part No C522 ELECTROLYTIC CAP 1000 F 25V M or CE1EMZPDL102 ELECTROLYTIC CAP 1000 F 25V M or...

Page 59: ...P 1608 B K 1000pF 50V or CHD1JK30B102 CAP CHIP 1608 K X7R 0 001 F 50V CHD102EYA032 C839 CHIP CERAMIC CAP 1608 B K 1000pF 50V or CHD1JK30B102 CAP CHIP 1608 K X7R 0 001 F 50V CHD102EYA032 C840 CHIP CERA...

Page 60: ...SWITCHING DIODE 1SS133 T 77 or QDTZ001SS133 Ref No Description Part No DIODE SWITCHING HSS4148TE E or QDTZ0HSS4148 DIODE SWITCHING 1N4148 F0021 NDTZ01N4148F D504 DIODE FR154 or NDLZ000FR154 DIODE FR15...

Page 61: ...DTZ01N4148F D803 DIODE ZENER 18BSB T26 or NDTB018BST26 DIODE ZENER HZS18NB2TE EQ QDTBHZS18NB2 D804 DIODE ZENER 18BSB T26 or NDTB018BST26 Ref No Description Part No DIODE ZENER HZS18NB2TE EQ QDTBHZS18N...

Page 62: ...15F TRANSISTOR 2SC1815 GR TE2 F T or QQS12SC1815F NPN TRANSISTOR 2SC5343Y AT or NQSY02SC5343 Ref No Description Part No NPN TRANSISTOR 2SC5343G AT or NQSG02SC5343 NPN TRANSISTOR 2SC5343MG AT or NQSG2S...

Page 63: ...NPN TRANSISTOR 2SC5343M Y NQSY2SC5343M RESISTORS R12 CHIP RES 1 10W J 100 or RRXAJR5Z0101 RES CHIP 1608 1 10W J 100 RRXA101YF002 Ref No Description Part No R13 CHIP RES 1 10W J 100 or RRXAJR5Z0101 RE...

Page 64: ...10W J 10k or RRXAJR5Z0103 Ref No Description Part No RES CHIP 1608 1 10W J 10k RRXA103YF002 R404 CHIP RES 1 10W J 1 5k or RRXAJR5Z0152 RES CHIP 1608 1 10W J 1 5k RRXA152YF002 R405 CHIP RES 1 10W J 1k...

Page 65: ...1 4W J 12k or RCX4123T1001 RES CARBON FILM 1 4W J 12k RCJ123PAK001 Ref No Description Part No R553 RES CARBON FILM 1 4W J 10k or RCX4103FS002 RES CARBON FILM T 1 4W J 10k or RCX4103T1001 RES CARBON F...

Page 66: ...657 CHIP RES 1 10W J 1k or RRXAJR5Z0102 RES CHIP 1608 1 10W J 1 0k RRXA102YF002 R660 RES CHIP 3216 1 4W J 1 0M or RRX4105HH034 RES CHIP 3216 1 4W J 1 0M or RRX4105YF004 Ref No Description Part No CHIP...

Page 67: ...CB S RED RCA 102H RD or JYRJ010YUQ03 JACK SW RCA PCB S RED 01 MTJ 032 04A 75 FE JYRJ010LY031 JK301 JACK RGB PCB S 01 RGB 11HS JXGJ21YUQ001 JK302 JACK RGB PCB S 01 RGB 11HS JXGJ21YUQ001 JS20 CHIP RES 1...

Page 68: ...26 DIODE ZENER HZS27NB2TE EQ QDTBHZS27NB2 D1101 DIODE ZENER 5V6BSB T26 or NDTB5R6BST26 DIODE ZENER HZS5 6NB2TE EQ QDTB0HZS5R6N D1102 SWITCHING DIODE 1SS133 T 77 or QDTZ001SS133 Ref No Description Part...

Page 69: ...or NQSG2SC5343M NPN TRANSISTOR 2SC5343M Y NQSY2SC5343M Q1010 TRANSISTOR KTA1267 GR AT P or NQS1KTA1267P Ref No Description Part No TRANSISTOR KTA 1266 GR AT P or NQS4KTA1266P TRANSISTOR 2SA1015 Y TE2...

Page 70: ...CHIP 1608 1 10W J 27k RRXA273YF002 R1214 CHIP RES 1 10W J 100k or RRXAJR5Z0104 RES CHIP 1608 1 10W J 100k RRXA104YF002 R1215 CHIP RES 1 10W J 82k or RRXAJR5Z0823 RES CHIP 1608 1 10W J 82k RRXA823YF00...

Page 71: ...iption Part No POWER SW CBA Consists of the following CAPACITORS C250 CHIP CERAMIC CAP 1608 B K 0 047 F 50V or CHD1JK30B473 CAP CHIP 1608 K X7R 0 047 F 50V CHD473EYA032 C251 CHIP CERAMIC CAP 1608 B K...

Page 72: ...LT850 M26 A0CA0EP 2010 06 15...

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