User manual FUNAI LT851-M19 SERVICE MANUAL
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Manual abstract: user guide FUNAI LT851-M19SERVICE MANUAL
Detailed instructions for use are in the User's Guide.
[. . . ] 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. [. . . ]
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