LG DP471B - Audio I;F Circuit Diagram

Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3-27 3-28
4. AUDIO I/F CIRCUIT DIAGRAM
H:MUTE
L:ACTIVE
L:MUTE
H:ACTIVE
H:MUTE
L:ACTIVE
OPREF
OPVCC-
OPREF
OPVCC+
OPVCC+
OPVCC-
SYS_MUTE
AVOUT_L
AOUT_FL
AOUT_FR
AVOUT_R
OP_OUT_L
OP_OUT_R
+3.3V_SYS
+5V_SYS_A
GNDA
GNDA
GNDA
GNDA
-5V_SYS
R91
7.5K/J/0402
R90
180/F/0402
C107
10U/10V/0805
R220
NC
2
1
C292
NC
R100
27K/F/0402
Q30
PMBS3904
B
E C
R219
1K/J/0402
R117
100K/F/0402
2
1
R101
4.7K/F/0402
R218
4.7K/J/0402
C128
1N/50V/0402
1
2
C129
1N/50V/0402
1
2
Q29
PMBS3904
B
E C
C296
0.1U/25V/0402
C291
0.1U/25V/0402
C110
1200P/50V/0402
C123
10U/10V/0805
C124
10U/10V/0805
C104
220P/50V/0402
R217
0/J/0402
C103
220P/50V/0402
+
-
U13A
APC558KC
V+
V-
3
2
1
8 4
R232
1K/F/0402
2
1
R118
100K/F/0402
2
1
R119
0/J/0402
21
R114
1K/F/0402
C121
120P/50V/0402
C122
120P/50V/0402
C299
10U/10V/0805
R233
1K/F/0402
21
R92
7.5K/J/0402
R89
180/F/0402
C108
10U/10V/0805
R103
27K/F/0402
+
-
U13B
APC558KC
5
6
7
8 4
C295
10U/10V/0805
Q25
PMBS3906
C E
B
L83
0/J/0603
C111
1200P/50V/0402
R122
0/J/0402
2 1
R102
4.7K/F/0402
R115
1K/F/0402