Audio Circuit Diagram - LG DP372 Service Manual

7. AUDIO CIRCUIT DIAGRAM

ANT
FM+3.3V
2 2
C D
1 B E 3 1 G S 3
SMBT3906 AF2301P
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Only for training and service purposes
FM+3.3V
R803 R803
R802 R802
NC/1k NC/1k
1k 1k
U801 U801
QN8000 QN8000
1
GND
2
C803 C803
GND
56pF 56pF QN8000 QN8000
3
RFO
R817 R817 10K 10K
4
CEN
5
VCC
C813 C813 C804 C804
10uF/10V 10uF/10V 104 104
Y801 Y801
7.6MHZ 7.6MHZ
1 2
3
R816 0/NC R816 0/NC
3.3V
3
C807 C807 C808 C808
104 104 105 105 MI2301 MI2301
R804 R804 R806 R806
10K 10K 5.1K 5.1K
R805 R805
5.1K 5.1K
FM_MUTE Q802 Q802
1
SMBT3906 SMBT3906
H:FM
L:FM C811 C811
104 104
R814 5.1k R814 5.1k SDA
SCL
R815 R815
5.1k 5.1k 220nH(NC/EMC) 220nH(NC/EMC)
R819 R819
ANT
OR OR
5.1K 5.1K
R810 R810
15
SEB
R807 R807
14
AL
C816 474 C816 474 47K 47K
13
GND
12
GND R812 R812
47K 47K
11
AR
C815 474 C815 474
R813 R813 R808 R808
10K 10K
10K 10K
R809 R809 C805 C805
1uF/10V 1uF/10V
3K 3K
C806 C806
10uF/10V 10uF/10V
FM+3.3V
L801 L801
2
FB FB
Q803 Q803
CE801 CE801
+ +
220uF/6.3V 220uF/6.3V C809 C809
104 104
C810 C810
105 105
3-39 3-40
R801 R801
0 0
FM+3.3V
C817 C817 C812 C812 L803 L803
L802 L802 102 102 220nH 220nH C818 C818
15pF 15pF 15pF 15pF
R818 R818 102 102
3.3K 3.3K
C814 C814
Q801 Q801 C819 C819
BFG540W/X BFG540W/X
1 2
100pF 100pF C E
3 4
B E
ML_OUT
C801 105 C801 105
R811 0/600R R811 0/600R
MR_OUT
C802 105 C802 105 EMC
OFF-PAGE CONNECTION
3.3V
3.3V 2,3,4
GND
GND 2,3,4,5,6,7
POWER I/F
FM_MUTE
FM_MUTE 2
SCL
SCL 2,3
SDA
SDA 2,3
MPEG I/F
ML_OUT
ML_OUT 5
MR_OUT
MR_OUT 5
AV I/F
ANTENNA ANTENNA
ANT801 ANT801
EMC
L804 L804
560nH 560nH
C820 C820
39pF(15P/EMC) 39pF(15P/EMC)
/EMC /EMC
Saturday, November 17, 2007 Saturday, November 17, 2007 Saturday, November 17, 2007
LGE Internal Use Only