Norcent LT2725 - Audio Board Schematic

27’’ LCD TV Color Monitor Norcent LT2725
54
9.3 Audio Board
R20
2.2K 1/10W
OUT2A
R58
10K 1/10W
R3
2.2K 1/10W
R13
NC
Y1
C19
0.1uF
Y1B
LOUT
C32
0.001uF
Q5
2SC1740S
+
C20
2.2uF/16V
AUDIO POWER SUPPLY INPUT
SRS_H
R61 NC
R37
2.7K 1/10W
L1 15uH
C53 0.033uF
R34 0 1/10W
C7 0.1uF
+
C64 10uF/16V
C39
0.1uF
R29
22 1/4W
MUTE_H
R57
22K 1/10W
C14 470pF
R1
8.2K 1/10W
GND
C6
0.001uF
P5V
C33 390pF
R56
10K 1/10W
Y2B
+
C52
560uF/50V
+
C13
10uF/16V
R4
11K 1/10W
D12VA
R32
1K 1/10W
+20V
C31
0.22uF
+
C34
1000uF/6.3V
U5 NJM2199
1
2
3
4
5
6
7 8
9
10
11
12
13
14
FIL1
FIL2
FIL3
VOL2
VOL1
VrefIN
Vref V+
GND
MODE
ROUT
LOUT
RIN
LIN
+20V
SRS_H
+
C67 100uF/35V
+
C62 10uF/16V
OUT1A
C22
0.1uF
R60 NC
+20V
OUT1B
C5
0.22uF
R28
470K 1/10W
715T1964-
D
LCD27AUDIO
A3
11Thursday, May 18, 2006
Title
Size Document Number Rev
Date: Sheet
of
R25 1K 1/10W
R22 100K 1/10W
R41
3.3K 1/10W
R39
NC
Y1B
OUT1A
C23
330pF
ROUT
OUT2B
+20V
U1
TP2050
32
20
36
35
34
33
22
21
31
18
30
28
26
27
25
24
23
29
15
17
16
14
12
11
10
13
1
19
7
8
9
6
4
3
2
5
IN2B
GNDREG
VCCSIGN
VCCSIGN
VSS
VSS
VDD
VDD
IN2A
NC
IN1B
TH_WAR
TRISTATE
FAULT
PWRDN
CONFIG
IBIAS
IN1A
VCC1A
OUT1A
OUT1A
GND1A
VCC1B
OUT1B
OUT1B
GND1B
GNDSUB
GNDCLEAN
VCC2A
OUT2A
OUT2A
GND2A
VCC2B
OUT2B
OUT2B
GND2B
R11
2.2K 1/10W
R6
11K 1/10W
TURN OFF MUTE
C11
0.22uF
C55 0.47uF
C27
0.1uF
R54 NC
LOUT
+
C15
2.2uF/16V
C4
0.22uF
FB7
120 OHM
1 2
R27
470K 1/10W
MUTE
ROUT
C3
330pF
+
C58 10uF/16V
R23
11K 1/10W
+
C63 10uF/16V
C12 0.001uF
R12 1K 1/10W
R2 10K 1/10W
C54 0.01uF
U2
TC2001
1
2
3
4
5
6
7
8
9
10
11
12
13
1415
16
17
18
19
20
21
22
23
24
25
26
27
28
BIASCAP
FDBKP2
DCMP
FDBKN2
VPWR
FDBKP1
FDBKN1
HMUTE
Y1
Y1B
Y2B
Y2
NC
OCD1REF
OCD0
VLO
OVRLDB
VHI
GND
V5
VP1
IN1
MUTE
BBM2
BBM1
VP2
IN2
L2 15uH
LIN
+
C60 1uF/50V
R36 NC
R30
15 1W
R24
20K 1/10W
C2
0.1uF
Y2B
C16
470pF
L9 100uH
R10
15 1W
R19
NC
R14 470K 1/10W
D12V
C56 0.33uF/16V
+
C66
22uF/16V
FB1
300 OHM
1 2
C35
0.1uF
R38
2.7K 1/10W
LOUT
D12V
R18
1K 1/10W
Y1
FB3
300 OHM
1 2
L3 15uH
RIN
P5V
+
C28 10uF/16V
+20V
Y2
+
C36
1000uF/6.3V
C17 0.1uF
R17
11K 1/10W
R26
NC
U3 BA05FP
1
2
3
VCC
GND
OUT
VR1
NC
ZD1
HZ6C2-E
12
GND
R31
11K 1/10W
RIN
C38 0.1uF
C18 0.1uF
CN6
AUDIO PS I/P
1
2
3
4
CN7
SIG.& CTL I/P
1
2
3
4
5
6
C29 0.1uF
FB4
300 OHM
1 2
RIN
R21 2.2K 1/10W
R7
10K 1/10W
ROUT
MUTE
C1
0.1uF
CN3
RIGHT
2
1
C65 0.1uF
A5V
+20V
A5V
LIN
Y2
R8
22K 1/10W
C9
0.1uF
R40
10K 1/10W
OUT1B
C21 390pF
FB6 120 OHM
1 2
+
C37
100uF/16V
C24
0.22uF
CN1
LEFT
1
2
3
C26
0.001uF
R42
2.2K 1/10W
FB2
300 OHM
1 2
POWER DOWN MUTE ( VCC = 20V )
MUTE ON : 17.7V MUTE OFF : 17.8V
D12V
OUT2A
OUT2B
L5
100uH
R16
20K 1/10W
L4 15uH
L6
100uH
C25
0.22uF
C10
0.1uF
Q2
2SC1740S
LIN
R9
22 1/4W
+
C57 1uF/50V
R33
NC
+
C61 10uF/16V
R5
470K 1/10W
C30
0.1uF
+
C59
100uF/25V
R15 100K 1/10W
C8
0.1uF
FB5
300 OHM
1 2
SIGNAL & CONTROL INPUT