User manual FUNAI LT851-M19 SERVICE MANUAL

[. . . ] SERVICE MANUAL This Service Manual is for the LT850-M19 (A0CN0EP) / LT851-M19 (A0CN1EP) model. For the LT850-M19 (A0CN0EP) / LT851-M19 (A0CN1EP) model, the letter (A0CN0EP) / (A0CN1EP) is printed on the Serial Number Label on the back of the unit. Label "A0CN0EP" "A0CN1EP" 19 COLOR LCD TELEVISION LT850-M19 LT851-M19 19 COLOR LCD TELEVISION LT850-M19 / LT851-M19 TABLE OF CONTENTS Specifications . 15-1 The LCD panel is manufactured to provide many years of useful life. [. . . ] For continued protection against fire hazard, replace only with the same type fuse. 10-3 A0CN0SCM1 Main 2 Schematic Diagram 10-4 A0CN0SCM2 Main 3 Schematic Diagram 10-5 A0CN0SCM3 Main 4 Schematic Diagram 10-6 A0CN0SCM4 Function & Junction Schematic Diagram 10-7 A0CN0SCF Digital Main 1 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-8 A0CN0SCD1 Digital Main 2 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-9 A0CN0SCD2 Digital Main 3 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-10 A0CN0SCD3 Digital Main 4 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-11 A0CN0SCD4 Digital Main 5 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-12 A0CN0SCD5 Digital Main 6 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-13 A0CN0SCD6 Digital Main 7 Schematic Diagram 1 NOTE: 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 Diagram Section. 10-14 A0CN0SCD7 Main CBA, Function CBA & Junction CBA Top View Because a hot chassis ground is present in the power supply circuit, an isolation transformer 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. CAUTION !Fixed voltage (or Auto voltage 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 AC power supply. Otherwise it may cause some components in the power supply circuit to fail. NOTE: The voltage for parts in hot circuit is measured using hot GND as a common terminal. For continued protection against fire hazard, replace only with the same type fuse. Main CBA ON+7. 5V R1113 D1016 Q1025 D1034 J237 GND R1095 VCOM-PWM J236 BL J233 GND Q1023 VCOM-PWM Q1019 J296 PROTECT BL-SW J246 J290 P-ON+5V D649 D510 C1055 J253 GND J257 BL-SW +3. 5V D513 1 3 J323 J295 J293 GND J307 D1005 D1020 R1029 D1036 GND Q1016 ON+7. 5V C1013 J238 L11 R1012 D1022 R1014 D1001 D1004 J228 Q1001 J1004 C1033 D1026 D1014 D1007 Q1004 C623 J271 P-ON-H1 J325 GND R12 Q301 Q1007 R1006 BL Q1018 J245 R1049 D511 Q616 PROTECT BL D1027 J259 C1027 GND C301 C641 J292 R1002 C27 C16 TU10 P2 1 Q1012 R1074 J247 D1025 C1008 D1010 D1012 C1005 J319 GND R1093 D301 C1058 J312 J1010 D1003 Q305 J351 CN1001 R1102 Q1010 D642 J1011 Q1008 D1029 D1040 C1019 Q1020 R1096 C647 C318 L405 Q404 R1118 R670 J288 SIF N Q406 D1030 J361 R1026 2IN+ D643 R1117 D1019 R1097 H1 C1015 J280 J270 ON/OFF R620 R619 R635 J1017 D638 R656 Q609 C629 R471 C622 D636 R646 J273 +15V J354 ON/OFF J258 H1 P-ON/OFF J1015 Q604 D634 J313 TU CVBS J320 PON+11V 2 C1012 R638 D621 J302 D1002 D624 J314 PON+11V J321 A-MUTE H1 J356 J277 ON/OFF R806 Q613 D629 J264 D632 R639 +33V J344 GND J348 1. 1V J340 ALL+3. 3V D646 J256 Q801 D623 C1002 D1021 J304 J331 +33V C1011 D617 R641 GND Q802 J309 GND for J339 P-ON+3. 3V D620 POW C628 Q612 D801 D502 J349 J337 J346 GND GND J305 J347 +3. 5V J342 +15V IC801 C814 J322 J317 AMP-L D612 J316 VDACOUT1 C808 Q803 CN404 D1046 D637 J338 GND R805 C812 OUT D622 J412 J411 C616 C619 C613 C614 D671 D802 J352 D803 COLD D619 R684 D616 R689 R697 R675 D650 J263 D804 GND J311 D805 J286 R690 D806 D670 SCART R676 CVBS 3 R685 Q606 D672 R691 C806 J275 GND C807 C1014 D602 D673 PCB STUD D613 D618 HOT C602 D604 C637 D648 Q617 C804 J274 CVBS VN J327 CVBS V ALL+3. 3V C805 C422 J334 J410 J308 J300 D641 CN1002 C605 R612 J249 R429 R431 R454 D416 SPDIF R617 D611 FH602 C612 Q607 D640 Q610 R427 R661 J262 P-ON/OFF R453 JK401 J278 L CVBS D607 J353 R686 Q611 R651 D414 JK407 JK408 JK409 JK411 JK412 R457 R602 T601 L406 R433 R624 R456 C615 J333 C632 J283 SLOW SW-IN C611 2 TOOL NO. 1 2 3 4 5 6 7 8 9 10 L601 F601 T 4A H/250V D603 R425 R455 D606 BC601 R614 BC602 COLD R611 R613 D635 D645 D633 R401 JK410 JK402 JK403 JK404 JK405 JK406 WARNING: TO PREBENT ELECTRIC SHOCK AND FIRE HAZARD. DISCONNECT MAINS PLUG BEFORE FUSE REPLACEMENT AND REPLACE ONLY WITH MARKED. Q603 J355 R421 SLOW SW-IN C621 C601 R452 R402 D610 FH601 R610 D628 C607 D608 C606 C609 D401 D627 R682 IC605 J299 R636 D410 D426 D626 D425 R665 D411 D413 L403 D427 D609 Q602 R609 R616 J1026 J1020 J1019 J1027 Q608 Q601 D601 HOT J301 D422 J248 D418 R476 D423 D421 R447 R463 R442 R601 R615 R451 D424 R477 C608 J244 J306 R459 R458 L401 SA601 R637 R659 J328 GND J358 J329 L402 J400 GND PCB STUD C415 SP-GND J330 D419 JK413 C101 SW106 VOL. DOWN R438 BC401 R441 R436 C419 SW601 SW101 POWER Q101 Q102 SW102 CH. UP SW105 VOL. UP 1 1 R111 1 2 1 CN801 J1023 1 D403 D406 D407 R449 D408 D409 R445 D405 D404 D402 CN152 6 1 2 D420 CN802 BLUE TM602 AC601 BROWN TM601 RS101 C107 R118 POW. D102 J904 GND R112 R106 C108 J1024 R110 D104 CN101B R104 C109 R113 SW103 CH. DOWN SW104 MENU R115 R116 R157 J298 ALL+3. 3V R114 DET 1 D151 6 CN101 A B BA0CN0F0101 2 C B D CN101A D103 ST. BY D101 C7A3 A3 J902 RCV 6 P b 6 E F G Function CBA 10-15 Junction CBA BA0CN0F01012 1 CN401 29 D605 C618 L407 GND 28 L408 2 1 29 C1006 Q605 J343 ALL+3. 3V J1016 GND C630 J281 28 R1013 R640 J335 Q804 C1059 +3. 5V Q401 J341 J336 D631 C417 J310 PON+11V R1092 C626 J303 D501 C640 D639 J315 SCART-OUT-SEL J318 AMP-R 1 R1091 R680 R669 GND T1002 J359 4 R1032 D615 J1003 GND Q405 D1028 C430 GND Q614 J1028 D506 R653 J1025 CN303 R1030 J252 GND J360 GND J261 J1012 R1034 R1033 R644 J265 R663 D503 TU J289 CVBS 29 D644 PANEL-6. 8V D1039 GND R1008 P-ON+3. 3V GND Q10 R652 P-ON-H2 C1001 D1013 R1007 Q1006 Q1011 D651 Q615 J350 D1015 C1007 R1017 C1023 J287 SIF 28 R1103 R1101 J357 GND J279 GND Q1017 J1013 D1018 D1008 R1094 R1065 C639 R1003 R1031 R1010 D508 R660 R11 Q1015 D1011 D1009 D509 J231 PROTECT 1 J332 ON+7. 5V J260 PANEL+13V Q1002 C14 R1100 J291 P-ON+5V R1066 D1031 D1006 J242 2IN+ J243 GND R1001 J239 GND R1111 GND Q1009 C1009 P-ON+3. 3V R305 J297 3 C18 CN302 J232 GND J1005 J230 GND C1053 PANEL+25V R309 D653 C19 5 J229 D1045 L10 D1023 UVP 2 J1007 Q1003 D1035 C1 J1006 J234 J255 C319 C1010 C7A3 J362 GND A3 J269 J251 PROTECT PROTECT GND R1044 J241 P-ON-H2 J294 R1108 J276 D1024 Q1024 Q302 D302 Q1014 J235 UVP 1 GND J240 D1038 D1041 D625 29 Q303 J272 28 1 C312 11 1 R308 J324 PON+11V BL-ADJ J267 D1033 J268 PROTECT J250 GND C1031 2 CN301 10 BA0CN0F0101 2 A 3 2 NOTE: The voltage for parts in hot circuit is measured using hot GND as a common terminal. CAUTION !For continued protection against fire hazard, replace only with the same type fuse. 5 4 3 2 Q1019 CN1001 D1004 C1040 C1013 R1014 R1016 H. V CAUTION C1014 1 2 C801 CN1002 R1111 R1012 Q1003 C1015 C1055 D1005 GND Q1009 C821 J1023 C1004 D1034 C1033 C1008 J228 Q1015 D1001 R1058 R1015 D1011 C1044 R1059 D1010 D1016 C1009 R1056 C1001 D1013 C1010 R1019 C1003 R1023 R1022 J1026 J1020 Q1014 D1012 J230 GND J412 D1015 D1027 C1059 R1115 SA601 C1007 R1086 R1087 J1027 R1123 R1121 R1091 D1046 Q1025 D1008 R1094 R1112 UVP J235 J234 R1113 D1024 R1017 GND J232 D1025 D1002 D1022 R1039 R1035 C1061 R1122 R1119 R1002 D1029 D1040 J1012 R1010 Q1017 C1017 J1013 C1031 R1103 D619 C1035 R1069 D1020 H1 FH602 FH601 J277 ON/OFF R1020 R1089 R1072 C1037 R1071 R1073 C1043 J237 GND C1050 R1090 R1070 IC1002 +33V J331 GND Q1016 C1058 D605 C1019 J411 R1001 J239 C1048 D1003 C1005 C1036 C1012 D607 J1011 C1011 C1042 COLD D602 J1010 D604 C1041 R1088 Q1001 C1018 HOT ON+7. 5V BL J236 R1093 C1038 Q1005 Q1022 1 2 L601 C601 R1114 UVP D1023 R1092 R601 R1120 C602 D1007 J1019 R1018 R1083 C1039 C1002 R1013 D1021 C1057 D1006 R1081 R1082 SW601 R1116 D1035 D1014 BC601 D1028 Q1007 C616 R1044 R1030 C107 ON+7. 5V D636 Q612 C106 D1039 Q613 BL GND J240 C622 R1041 CAUTION !Fixed voltage (or Auto voltage 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 AC power supply. Otherwise it may cause some components in the power supply circuit to fail. R1040 J252 2IN+ C605 IC1001 ON+7. 5V R619 R1065 R1003 C1028 J245 D637 J242 2IN+ J243 GND R1074 C628 R1055 Q1006 R1026 R638 C1052 D615 Q601 C1049 R1025 D629 C101 D621 D623 J241 C1 R1054 C1054 JS902 J904 GND JS901 R103 C1053 R639 R1049 C1056 J250 GND D624 J353 J1003 GND R1109 R1095 R635 D609 GND J360 J249 J1006 C1023 J1004 D631 D632 C1060 Q604 D1033 C1045 D601 R605 Q1024 R1106 C1027 D622 Q1004 J319 GND J264 R606 C607 C1016 R607 R616 R610 R609 J1005 R117 R1105 D1041 R1100 D1045 C608 J244 D634 Q1011 J257 BL-SW C1024 C309 R1031 Q1020 Q605 R1052 R1097 R1096 R617 D603 R612 R1053 R1005 2 1 J347 J255 PANEL+25V CN301 R1034 R1033 R1117 R1118 R689 D616 10 C306 GND J259 C639 R685 IC301 R307 C636 R666 J302 D613 D620 R308 D644 D643 C614 Q303 C303 R686 C302 R648 J260 PANEL+13V JS612 1. 1V J338 D618 for POW R644 SW105 VOL. UP R106 C301 R663 D509 C637 Q615 VCOM-PWM R301 J341 +33V R698 C646 R661 J262 C632 J354 Q617 R651 Q302 P-ON/OFF C312 R660 J343 ON/OFF J342 J258 J303 R675 R694 D645 Q301 R652 D642 R677 R678 R627 D641 J410 R626 R625 R682 R636 Q608 R665 SW106 VOL. DOWN C109 PROTECT R309 J362 J231 ALL+3. 3V +15V J349 P-ON/OFF GND J346 P-ON+3. 3V J265 D511 J337 H1 Q606 R305 D650 GND J263 1 GND GND PANEL-6. 8V R681 R806 J261 J328 J301 J330 R111 BA0CN0F0101 2 J1015 GND D804 C638 C643 R805 SP-GND D103 R401 1 6 CN101B J1016 D 3 Q610 D104 J268 PROTECT D508 R659 R304 R302 C621 D627 R116 D626 R110 R306 D635 R628 R303 J339 P-ON+3. 3V D671 R697 Q611 J233 D651 R688 D648 D640 C304 C642 Q603 R637 C103 R108 DET +3. 5V J256 C648 R657 R649 J306 J299 R115 R311 D628 R114 J340 ALL+3. 3V D633 R629 C104 Q614 D801 D502 J267 D653 C814 R807 D670 R683 C318 R696 D638 JK410 GND R501 D802 D673 R695 R676 Q616 D501 C640 D427 D506 R653 R687 C506 D413 C501 C502 JK407 GND J332 D301 R690 D649 D672 J308 J300 R404 R428 C411 R691 ALL+3. 3V C807 D803 R815 R818 R813 C810 R804 C410 R426 R429 C405 R403 1 CN101 CN101A 1 6 R656 J251 R319 D503 J344 D639 6 C447 D510 PROTECT J271 P-ON-H1 Main CBA, Function CBA & Junction CBA Bottom View PROTECT +3. 5V J272 L405 C629 P-ON+3. 3V J323 C623 R321 P-ON-H2 C431 J348 GND R469 R468 R830 Q405 Q406 R829 Q804 R471 R827 R826 R470 C432 J1028 J335 R467 C503 C504 J350 GND D425 J312 C803 R814 C430 C630 IC801 A JK408 C434 C805 JK402 1 3 J325 GND D513 R817 R831 R430 C412 D426 C409 R450 R313 R12 D806 R314 R422 D401 R431 R446 JK413 R320 Q305 GND JK409 J311 C14 Q404 J352 D411 C505 D805 R463 1 PON+11V J324 BL-ADJ J295 GND J296 PROTECT R11 Q10 JK403 R417 C413 C408 BC401 J297 3 PROTECT R424 R432 C446 J1024 C804 C429 C809 C16 J351 R474 J1025 R472 GND R473 C13 C433 R475 R21 R803 R433 R449 R425 R423 R421 SLOW D410 D408 C806 BL-SW J293 C11 L11 C417 J305 SW-IN R448 C641 L408 L406 L407 R322 R10 C17 R812 R811 R427 C819 J310 PON+11V R408 J304 C820 R416 C428 J358 R442 D409 R445 Because a hot chassis ground is present in the power supply circuit, an isolation transformer 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. VCOM-PWM J294 C644 J290 P-ON+5V J307 GND C19 C24 R26 R27 L10 C425 R443 C427 R444 D406 D407 JK411 JK404 C811 R810 R809 C813 D424 R480 C153 R483 PON+11V J320 J322 J336 C825 C440 R459 C808 R455 C437 R452 D404 R157 J283 SW-IN SLOW D423 R440 D405 C154 JK405 C444 D422 R409 Q401 R407 R482 R481 R487 C424 C426 R441 C151 J298 ALL+3. 3V C18 JK412 C422 1 R25 R22 R13 C320 J292 D302 C15 R18 R15 R28 C12 R24 C416 C407 R410 R486 R405 R808 D403 PON+11V J321 R820 J286 OUT CVBS SCART C435 GND J333 R454 R458 L401 C401 R406 C406 R412 C443 R156 R436 D402 R479 CN152 R464 JK406 C817 R823 R16 C22 C21 R413 R411 C815 R20 C445 C823 Q802 J309 R824 GND J334 Q803 C824 V J327 CVBS C439 C449 R437 JK401 R477 R457 R485 D419 C418 R476 C436 R419 C423 R439 R478 D625 J276 C27 D418 C414 C448 R816 6 C152 J275 R825 GND C420 VN J274 CVBS R456 D414 Main CBA J315 SCART-OUT-SEL J318 AMP-R J281 GND J316 VDACOUT1 J314 C419 R19 J357 C442 D416 L403 J329 J313 TU TU C316 R318 J317 AMP-L A-MUTE TU10 N C315 28 29 GND J359 2P SIF J287 28 J279 GND CN302 1 C438 2 28 2 28 SPDIF J355 C450 GND J400 D420 2 C451 CN802 29 CN303 1 29 CN404 1 29 CN401 1 WF2 PIN 27 OF CN401 WF8 PIN 29 OF CN404 WF9 PIN 28 OF CN404 WF10 PIN 26 OF CN404 WF3 PIN 29 OF CN401 WF6 PIN 8 OF CN404 WF7 PIN 22 OF CN401 WF5 PIN 6 OF CN404 WF4 PIN 4 OF CN404 WF1 PIN 2 OF CN404 2 1 G C314 C313 CVBS C317 J289 CVBS J288 GND R23 SIF R461 C404 R453 R402 L402 J278 C441 L CVBS R484 R415 C415 P-ON-H2 J291 P-ON+5V C822 C802 D151 F R801 Q801 R819 D421 R438 C10 IC402 C155 E Junction CBA J1017 R802 C647 C812 R447 R451 J269 Q609 P b 10-16 R670 R650 C108 J902 RCV C615 C305 R668 C626 R310 R312 R630 SW104 MENU R667 H1 C631 R658 R655 R654 Q607 J270 ON/OFF C613 JS611 COLD Function CBA C618 R624 IC605 11 C311 C319 GND J356 T601 C612 C310 R1099 C1020 +3. 5V J253 GND R684 SW103 CH. DOWN R642 J280 R643 +15V J273 D646 Q1002 D612 C609 Q1023 D1019 R1004 J248 HOT R611 R613 J246 R1110 R1107 R640 PCB STUD Q1012 R1042 R1048 R604 C619 D611 GND J361 D606 C625 SW102 CH. UP R112 R113 ST. BY D101 R1108 J1007 D1031 B BA0CN0F0101 2 C Q602 D1038 Q102 R104 R1028 D1018 R1027 Q1008 R641 BC602 R107 R1046 R1036 R118 R1021 C611 R620 PCB STUD Q101 R673 R672 BL C606 R1067 J247 POW. D102 R1104 C1047 Q1018 R602 C1026 R1032 C102 R1101 R1102 C1034 R1068 Q1010 R671 JS903 R102 R674 R105 R109 R1066 R1006 R646 R101 D1030 R615 R119 J238 R1011 D608 R669 C105 R614 R1037 R1045 R1043 R1007 D610 R1029 R680 R1008 D617 C1025 R1038 R120 RS101 R1024 SW101 POWER AC601 R1057 D1036 D1026 D1009 C1032 R1060 R1061 C1006 B A GND J229 T1002 CN801 R1084 1 BA0CN0F01012 WAVEFORMS WF1 ~ WF6 = Waveforms to be observed at Waveform check points. [. . . ] 1/10W F 51. 0 k or CHIP RES. (1608) 1/10W F 51k or RES CHIP 1608 1/10W F 51. 0k R1056 CHIP RES. 1/10W F 10k or RES CHIP 1608 1/10W F 10. 0k R1060 R1061 R1065 R1066 R1067 R1068 R1069 R1070 R1071 CHIP RES. 1/10W J 33k or RES CHIP 1608 1/10W J 33k RES CARBON FILM T 1/4W J 2. 7k or RES CARBON FILM 1/4W J 2. 7k RES CARBON FILM T 1/4W J 2. 7k or RES CARBON FILM 1/4W J 2. 7k CHIP RES. 1/10W F 4. 3k or CHIP RES. (1608) 1/10W F 4. 3k or RES CHIP 1608 1/10W F 4. 30k R1105 R1106 R1107 R1108 CHIP RES. [. . . ]