Av Circuit Diagram - LG DP271, DP271B, LPA-837 Service Manual

4. AV CIRCUIT DIAGRAM

C530 C530
100pF 100pF
L505 L505
1.8uH 1.8uH
CVBS
C505 C505
R536 R536 100pF 100pF
68 1% 68 1%
A-5V
R538 R538
0 0
AV-5V
C518 C518
0.1uF 0.1uF
C501 C501
R516 R516
AOUT_L
10uF/16V 10uF/16V 11K 11K
AV+5V
R548 R548
NC NC
R549 R549
+ C529 + C529
0 0
NC NC
C508 C508
R505 R505
AOUT_R
10uF/16V 10uF/16V 11K 11K
A+5V
R543 R543 R537 R537
10K 10K 10K 10K
R545 R545
10K 10K
A_MUTE_SW Q508 Q508
1
SMBT3904 SMBT3904
2
C
1 B E
SMBT3904
A+5V
L502 L502
FB FB
AV+5V
+ +
CE507 CE507 C506 C506
10uF/16V 10uF/16V 0.1uF 0.1uF
U501 U501
FSAV330 FSAV330
14
4B1
11
3B1 <-->
5 12
2B1 4A
Change BAT54S->NC
2 9
1B1 3A
C502 C502 7
2A
100pF 100pF CVBS_IN Q509 Q509
13 4
4B2 1A
10 BAT54S(NC) BAT54S(NC)
3B2
6
2B2
C522 C522 R524 R524
3
1B2
15 ESD(15pF) ESD(15pF) 10(NC) 10(NC)
OE
VIDEO_IO_CTL
1
S
A+5V
R544 R544
30.9K 30.9K
C510 C510 100pF 100pF
R532 R532
10K 10K
L_SPEAKER
AV-5V
ML_OUT
R528 R528
5.1K 5.1K U504A U504A R510 R510 L507 L507
C514 C514 C513 C513
100 100 FB FB
2
- -
1
3
+ +
C507 C507 NJM4580M NJM4580M 10uF/16V(BP) 10uF/16V(BP) 10uF/16V(BP) 10uF/16V(BP)
1000pF 1000pF R553 R553 C503 C503
A_MUTE 4.7K 4.7K 22pF 22pF
1
AMP+5V
Q514 Q514
R509 R509 SMBT3904 SMBT3904
30.9K 30.9K
R535 R535
C516 C516 100pF 100pF 10K 10K
R_SPEAKER
MR_OUT
AV-5V
R547 R547
5.1K 5.1K U504B U504B R530 R530 L508 L508
C517 C517 C524 C524
100 100 FB FB
6
- -
7
5
+ +
C525 C525 NJM4580M NJM4580M 10uF/16V(BP) 10uF/16V(BP) 10uF/16V(BP) 10uF/16V(BP)
1000pF 1000pF R554 R554
A_MUTE 4.7K 4.7K C509 C509
1
AMP+5V 22pF 22pF
Q507 Q507
SMBT3904 SMBT3904
5VA
AV+5V 3
R556 R556 R557 R557
4.7K 4.7K 4.7K 4.7K
R540 R540 R558 R558
0 0 10K 10K
1 Q516 Q516
Q512 Q512 SMBT3904 SMBT3904
1
SMBT3906 SMBT3906 R555 R555
1K 1K
A_MUTE VIDEO_IO_CTL Q515 Q515
1
SMBT3904 SMBT3904
R541 R541
220 220
3 E 3
SMBT3906
VR501 VR501
L_SPEAKER CE505 CE505
10uF/16V 10uF/16V
7
7
6
6 2
R_SPEAKER CE503 CE503
5
5
10uF/16V 10uF/16V 4
4 1
3
3
VOLUME VOLUME
TP502 TP502 R529 R529
A_MUTE 1 Q501 Q501
SMBT3904 SMBT3904
4.7K 4.7K
R512 R512 Q503 Q503
1
4.7K 4.7K SMBT3904 SMBT3904
J503 J503
7
1
4
CVBS CVBS
5
3
R R
2
PJK-632 PJK-632
Q518 Q518
BAT54S BAT54S
C504 C504
56pF 56pF
C526 C526
56pF 56pF
2 AMP+5V
Q517 Q517
SMBT3906 SMBT3906
3-39 3-40
7
6 2
5
20K
4 1
3
20K
270 degree
(Top View)
C519 C519
2 0.1uF 0.1uF
SP_L-
1
SP_L-
1 5
Shutdown -OUT1
R519 R519 R521 R521 C511 C511
SP_L+
10K 10K C528 C528 47K 47K NC NC 3
+OUT1
1uF/50V 1uF/50V
R502 R502 10K 10K 6
Vin1
U502 U502
16
HP-IN
PT2303 PT2303
R523 R523 10K 10K
11
Vin2
C520 C520 C515 C515 SP_R+
14
+OUT2
R504 R504 1uF/50V 1uF/50V R542 R542
10K 10K 47K 47K NC NC 12 SP_R-
-OUT2
8
+IN1
SP_R- 9
+IN2
10
VREF
CE504 CE504
22uF/16V 22uF/16V R515 R515
4.7K 4.7K
1
R525 R525
1.2K 1.2K
TP503 TP503
/SP_MUTE
TP508 TP508
TP501 TP501
CE501 CE501
SP_R- 100uF/10V 100uF/10V R534 R534 R539 R539
100 100 100 100
TP506 TP506
CE502 CE502
SP_L- 100uF/10V 100uF/10V R511 R511 R550 R550
100 100 100 100
R518 R518 R546 R546 R517 R517 R506 R506
TP507 TP507
1K 1K 1K 1K
1K 1K 1K 1K
TP505 TP505
R513 R513 1 Q506 Q506
4.7K 4.7K SMBT3904 SMBT3904 R551 R551
100 100
R552 R552
100 100
A_MUTE R501 R501 Q505 Q505
1
TP504 TP504
4.7K 4.7K SMBT3904 SMBT3904
R531 R531 Q504 Q504
1
4.7K 4.7K SMBT3904 SMBT3904
R533 R533 Q502 Q502
1
4.7K 4.7K SMBT3904 SMBT3904
1 J502 J502
C527 C527
R520 R520 ESD(15pF) ESD(15pF)
150 150 C521 C521
ASPDIF 0.1uF 0.1uF
3
R522 R522 Q510 Q510
2
100 100 C523 C523 BAT54S(NC) BAT54S(NC)
330pF 330pF COAXIAL JACK(ST-3531) COAXIAL JACK(ST-3531)
Change 10->NC
R527 R527 A+5V
10(NC) 10(NC)
OFF-PAGE CONNECTION
5VA
5VA 4,6
A+5V
A+5V 2,4
A-5V
A-5V 4
GND
GND 2,3,4,6,7,8
POWER I/F
CVBS
CVBS 2
CVBS_IN
CVBS_IN 2
AOUT_L
AOUT_L 2
AOUT_R
AOUT_R 2
ASPDIF
ASPDIF 2
A_MUTE_SW
A_MUTE_SW 2
/SP_MUTE
/SP_MUTE 2
VIDEO_IO_CTL
VIDEO_IO_CTL 2
MPEG I/F
SP_L-
SP_L- 7
SP_L+
SP_L+ 7
SP_R-
SP_R- 7
SP_R+
SP_R+ 7
LCD I/F
ML_OUT
ML_OUT 8
MR_OUT
MR_OUT 8
FM-TX I/F
L509 L509 A+5V
FB FB
CE506 CE506
220uF/6.3V 220uF/6.3V A+5V
R507 R507 R508 R508
100K 100K 100K 100K
R514 R514
100K 100K
C512 C512 Q511 Q511 1
0.1uF 0.1uF SMBT3904 SMBT3904
Q513 Q513
SMBT3906 SMBT3906
A+5V
3
8
6
5
4
7
2
1
J504 J504
PHONE JACK PHONE JACK
J501 J501
PHONE JACK PHONE JACK
3
8
6
5
4
7
2
1
LG & MALATA LG & MALATA LG & MALATA
Document Number Document Number Document Number
05.AV 05.AV 05.AV
Monday, January 15, 2007 Monday, January 15, 2007 Monday, January 15, 2007