AOC Norcent LT3725, Service Manual

Page: 50 / 86

37’’ LCD TV Color Monitor Norcent LT3725
50
9.3 Audio Board
PGND
16 Ohm speak
Q2
NC
C46 NC
+20V
GAIN1
RIN
TPA3100D2
CN7
CONN
1
2
3
4
5
6
L1 NC/600 OHM
1 2
R4
10
K
1/
10W
L12 NC/600 OHM
1 2
+
C29
100uF/25V
C9
1uF
PGN
D
FAULT
C
45
1uF
CN3
CONN
1
2
AGND LOUT
C4
0.001uF
L13 NC/600 OHM
1 2
0
L ( 0V~0.8V )
+20V
C14 4.7uF
R10 NC
C1
0.1uF
3k Ohm
C48 NC
R34 NC
ROUT_N
R1
9
N
C
C4
3
N
C
AUDIO POWER SUPPLY INPUT
0
+20V
C3
4
0.
22uF
+
C51
10uF/25V
L2
22uH
PGN
D
GAIN0
H ( 2V ~ VDD )
1k Ohm
R37
1.2K 1/10W
+ C16 10uF/25V
C38
0.001uF
C11 4.7uF
L3 NC/600 OHM
1 2
1
R21 0 1/3W
SIGNAL & CONTROL INPUT
R36
SHUTDOWN
R1
10K 1/10W
D12VA
C31
10uF/16V
SPK_L+
LIN
LOUT_N
20
MUTE
LOUT-
R35
R2
0
N
C
C17 0.47uF
R14
33K 1/10W
1
C5
0.1uF
C39
0.47uF
C
7
4.
7uF
H ( 2V~VDD )
R38
C41
0.1uF
C
36
1uF
PGND
R33 NC/0
CN6
CONN
1
2
3
4
ACTIVE
C25 1uF
C40
0.001uF
T2091-C-X-X-1-060906 C
PAGE 01 AUDIO POWER AMP.
Custom
1 2 Tuesday , September 05, 2006
Title
Size Document Number Rev
Date: Sheet of
FAULT
26
C
35
0.
01uF
R26
NC/0
R6
10K 1/10W
R32
0 1/10W
LOUT_N
SPK_L-
+
C26
220uF/35V
TPA3100D2
C20 0.33uF
R36
3.3K 1/10W
R3
NC
1
L ( 0V~0.8V )
+20V
R31
0 1/10W
D1
RLZ6.8B
1
2
R3
0
10K
1/
10W
PGND
D12V
R1
6
47K
1
/10W
MUTE
C10 0.033uF
U2
NJM2199M
1
2
3
4
5
6
7
14
13
12
11
10
9
8
FIL1
FIL2
FIL3
VOL2
VOL1
Vref IN
Vref
LIN
RIN
LOUT
ROUT
MODE
GND
V+
1k Ohm
C37
0.1uF
L7
100uH +-20%
L11
22uH
D4
MLL4148
GAIN ( dB )
C3
3
0.
22uF
R25
100 1/10W
R24 0 1/3W
Close to IC
R9
47K
1/
10W
1
R37
L4
22uH
TPA3100D2
C12 1uF
+
C52
10uF/25V
C50 NC
SHUTDOWN
C13 0.01uF
C2
0.001uF
MUTE
C23 1uF
C8 0.
22uF
AGND
+20V
SRS_H
C22 4.7uF
L10 NC/600 OHM
1 2
R8
1M
1/
10W
NC
+
C15
220uF/35V
R28
10K 1/10W
GAIN1
ROUT-
R13 10K 1/10W
ACTIVE
D3
M
LL4148
U3
NC/NJM2761RB2
1
2
3
4
5 6
7
8
9
10
V+
OUTa
INa
INT
VREF SENSE
SW
INb
OUTb
GND
R23 0 1/3W
AGND
R22 0 1/3W
+ C18 10uF/25V
L8 NC/600 OHM
1 2
U1
TPA3100D2PHPR
1
2
3
4
5
6
7
8
9
10
11
12
13 14 15 16 17 18 19 20 21 22 23 24
25
26
27
28
29
30
31
32
33
34
35
36
37 38 39 40 41 42 43 44 45 46 47 48
GND
RINN
RINP
AGND
LINP
LINN
GAIN0
GAIN0
GAIN1
MSTR/SLV
SYNC
GND
GN
D
RO
S
C
VR
E
G
VB
YP
AG
N
D
BS
LP
LOU
T
P
LOU
T
P
LOU
T
N
LOU
T
N
BS
LN
GN
D
GND
PVCCL
PVCCL
PGNDL
PGNDL
VCLAMPL
VCLAMPR
PGNDR
PGNDR
PVCCR
PVCCR
GND
GN
D
BS
R
N
RO
UT
N
RO
UT
N
RO
U
T
P
RO
U
T
P
BS
R
P
S
HUT
DO
WN
MU
TE
FA
U
LT
AV
C
C
AV
C
C
ACTIVE
3k Ohm
ROUT+
RIN
C27
1uF
32
D12V
ROUT
ROUT
R12
10K 1/10W
PGND
LIN
Q3
NC
CN1
CONN
1
2
3
FAULT
0
GAIN0
LOU
T
+
R35
1.2K 1/10W
R2
9
3.
3K
1/
10W
R1
7
100K
1/
10W
+20V
RIN
VREG
C6 0.
22uF
L9
22uH
L ( 0V~0.8V )
RO
UT
-
C30
1uF
SHUTDOWN
LIN
VREG
R1
8
22K
1/
10W
RO
UT
+
R2
NC
SPK_R-
GAIN0
Q5
2SC2412KR
D
12V
A
LOUT+
LOU
T
-
R7
0
1/
10W
R5
1K 1/10W
R38
3.3K 1/10W
H ( 2V~VDD )
SRS_H
LOUT
C19 4.7uF
+
C4
4
100uF
/35V
AGND
D2
MLL4148
PGND
0
8 Ohm speak
C49 NC
C
42
4.
7uF
Q1
2SC2412KR
ROUT
R11 NC
36
ROUT_N
MUTE_H
SPK_R+
0
GAIN1
L6 NC/600 OHM
1 2
C3
0.47uF
VREG
+20V
C28 1uF
R1
5
47K
1
/10W
SHUTDOWN
LOUT
C47 NC
L5 NC/600 OHM
1 2
0
NC
C3
2
0.
1uF