Audio Board - Norcent LT3225 Service Manual

32'' LCD TV

9.3 Audio Board

715T1964 D
R1
U2
A5V 8.2K 1/10W
15
REF
R3
16
2.2K 1/10W OCD0
R4
17
R5 VLO
11K 1/10W
470K 1/10W
18
R8 OVRLDB
22K 1/10W
19
VHI
20
GND
+
21
V5
R15 100K 1/10W
22
VP1
C15
LOUT
23
IN1
R16 20K 1/10W
MUTE
2.2uF/16V 24
MUTE
R20 R21 2.2K 1/10W
25
BBM2
2.2K 1/10W
26
BBM1
R22 100K 1/10W
C20 27
R24
VP2
2.2uF/16V
20K 1/10W
ROUT
28
IN2
R28
470K 1/10W
R27
C28 10uF/16V
470K 1/10W
SIGNAL & CONTROL INPUT
CN7
SIG.& CTL I/P
D12V
1
SRS_H
2 FB6 120 OHM
GND
3
4 1 2 LIN
5
6 FB7
120 OHM
1 2 RIN
MUTE_H
D12VA
C53 0.033uF
C54 0.01uF U5 NJM2199
1 14 C64
FIL1 LIN
C55 0.47uF
2 13 C63
FIL2 RIN
C56 0.33uF/16V 3 12 C62
FIL3 LOUT
4 11 C61
VOL2 ROUT
NC
VR1
5 10
VOL1 MODE
6 9
VrefIN GND
R58 10K 1/10W
7 8
Vref V+
C57 1uF/50V
+
C59
C58 10uF/16V 100uF/25V
14
OCD1
13
NC
Y2
12
Y2
R6
Y2B
11
Y2B 11K 1/10W
OUT1A
Y1B
10
R13
Y1B
Y1 NC
9
Y1
8
HMUTE
7
R17
FDBKN1
11K 1/10W OUT1B
6
FDBKP1
R19
5
NC
VPWR
4
FDBKN2
3
DCMP
R23
2
FDBKP2 11K 1/10W OUT2A
1
R26
BIASCAP
NC
TC2001
R31
11K 1/10W OUT2B
R33
NC
TURN OFF MUTE
Q5 C67 100uF/35V
2SC1740S
MUTE
ZD1
2 1 Q2
2SC1740S
HZ6C2-E
L9 100uH
D12V
R61 NC
LOUT LIN
R60 NC
ROUT RIN
POWER DOWN MUTE ( VCC = 20V )
MUTE ON : 17.7V MUTE OFF : 17.8V
LIN
10uF/16V
RIN
10uF/16V
LOUT
10uF/16V
ROUT
10uF/16V
SRS_H
R40
10K 1/10W
+
P5V +20V C1
U1
0.1uF
23 15
IBIAS VCC1A
Y1
29 17
IN1A OUT1A
24 16
CONFIG OUT1A
25 14 +20V
PWRDN GND1A
R7
27 12
FAULT VCC1B
10K 1/10W
26 11
TRISTATE OUT1B
C9
0.1uF 28 10
TH_WAR OUT1B
Y1B
30 13
IN1B GND1B
18
NC
+20V
Y2
31
IN2A
C52
560uF/50V
21
VDD
22
VDD
C19
33 7
VSS VCC2A
0.1uF
34 8
VSS OUT2A
35 9
VCCSIGN OUT2A
36 6 +20V
VCCSIGN GND2A
20 4
GNDREG VCC2B
Y2B
32 3
IN2B OUT2B
19 2
GNDCLEAN OUT2B
1 5
GNDSUB GND2B
GND
TP2050
L5
R39 100uH
NC
D12V
U3 BA05FP
L6
100uH
R34 0 1/10W
1 3
VCC OUT
+ +
C66
22uF/16V
54
FB1 CN1
C5 C6 300 OHM LEFT
L1 15uH 0.22uF 0.001uF
1 2 3
2
1
C4
0.22uF
FB2
300 OHM
L2 15uH
1 2
C11
0.22uF
FB3 CN3
300 OHM RIGHT
L3 15uH C25
0.22uF 1 2 2
1
C24
0.22uF
FB4
300 OHM
L4 15uH
1 2
C31
0.22uF C32
0.001uF
FB5 CN6
300 OHM AUDIO PS I/P
+20V 1 2 1
2
3
4
A5V
+ AUDIO POWER SUPPLY INPUT
P5V
+
Title
LCD27AUDIO
Size Document Number
A3
715T1964-
Date: Thursday, May 18, 2006 Sheet
Norcent LT3225
Rev
D
1 of 1