Main Board (13 Of 15) Schematic Diagram - Panasonic TH-37LRT12U Service Manual

TH-32LRT12U-A * TH-37LRT12U/M/A

12.14. Main Board (13 of 15) Schematic Diagram

MAIN BOARD PCB-657-D (13/15)
!
+24V
J8
TP118
1 1
1
TP119
1 2
1
TP120
1 3
1
TP121
D 1 4
1
BASE/4P/2.0mm
GND_SIGNAL
+21V_AMP
C
D42 MBRX0520 R306 10K
1 2 1 2 2
P(7) MUTE_AMP
Q20
1 2
P(16) MUTE_AMP_WT
2SC2411
D41 MBRX0520
GND_SIGNAL
R311 0
P(3) Earphone_OUT_DETECT
B
TDA8947:
ADD FB41,FB42
TDA8946:
ADD D30,D31
D11 D13
+24V
ES3A/AB(SMD) ES3A/AB(SMD)
1 2 1 2 1
D12
ES3A/AB(SMD)
A
TH-32/37LRT12
Main Board (13 of 15) Schematic Diagram
5
Audio AMP
When using TDA8946
C320,C323,C324,C325,C328,C330,C322,C327 belong to 0.22UF
R303,R321,R326 belong to 0ohm
C329 belongs to 220UF/35V
R305,R309,R308,R313,Q21,C331 belong to NC
R310 belongs to 10K
R314 belongs to 2K7
R295,R296,R301,R302 belong to 3R9
R293 1K
R-AMP
1 2
P(7,13) AOUT0R
R294
5.6K
GND_SIGNAL R297 1K
L-AMP 1 2
P(7,13) AOUT0L
R299 10K R300
1 2
5.6K
R360 D7 GND_SIGNAL
LL4148
1 2 1
10K
Q19 D8 R304 39K
LL4148
2SC2411
2 1 2 1 2
+21V_AMP
GND_SIGNAL
R307 D9 LL4148
1 2
10K
D10 LL4148 R312 47K
1 2 1 2
R313 10K
1
GND_SIGNAL
DEL D30,D31
FB41 FB-DIP(NEW)
1
FB42 FB-DIP(NEW)
1
DEL FB41,FB42
D14 D15 D16 D17 D28 D31 D30
ES3A/AB(SMD) ES3A/AB(SMD) NC/ES3A/AB(SMD)
2 1 2 1 2 1 2 1 2 1 2 1 2 1
ES3A/AB(SMD) ES3A/AB(SMD) ES3A/AB(SMD) NC/ES3A/AB(SMD)
C334
0.1uF
GND_POWER
4
When using TDA8947AJ
Changing C324,C325,C328,C330,C320,C323,R295,R296,R301,R302,R310,R314,R303 to NC
C322,C327 belong to 0.47UF(0603SMD)
C321,C326,R308,R321,R326 belong to (0603 resistance 0 ohm)
R313 belongs to (10K)
C329 belongs to 220UF/35V
Q21 belongs to 2SC2411
+21V_AMP
C320 NC/0.22uF
1 2 8
IN1-
C321
C322 0.47uF/0.22uF 0/4700P
1 2 6
IN1+
C323 NC/0.22uF
1 2 9
IN2-
C326
C327 0.47uF/0.22uF 0/4700P
1 2 12
IN2+
R588 0 MODE2 5
MODE-02
GC
2 1 13
GC
R303 NC/0 C329 220uF/35V
GND_SIGNAL
2 10
MODE-01
+21V_AMP
11
SVR
R305
10K R308 0
1 2
C331 R310
+
R309 C332
+
10uF/50V NC/10K
10K 100uF/35V
GND_SIGNAL
GND_SIGNAL
Q21 C333 R314
2 2
+
2SC2411
33uF/25V NC/2K7
GND_SIGNAL GND_SIGNAL
GND_SIGNAL
G28 G29 G30 G31 G32 G33 G34 G35 G36 G50
2
2
G23 G24 G25 G26 G27
+21V_AMP
2
3
52
C318 1000uF/35V
1 2
C319 1000uF/35V
1 2
GND_SIGNAL C324
NC/0.22uF
R295
1 1 2
OUT1-
CON11 NC/3R9
TP122
1
1
1
C325 R296
2
NC/0.22uF NC/3R9
4
OUT1+
1 2 1 2
U34 BASE/2P/2.0mm
TDA8947J C328 TP123 GND_SIGNAL
NC/0.22uF
14 1 2
OUT2-
CON12 R301
TP124 NC/3R9
1
1
1
C330 R302
2
NC/0.22uF NC/3R9
17
OUT2+
1 2 1 2
BASE/2P/2.0mm
TP125 GND_SIGNAL
V : 0.5V ~ 4V , RANGE : 80 db
GC (-50db ~ 30 db)
V
GC : 24 db = OPEN
GND_SIGNAL
MODE: 0V ~ 1V = NORMAL
GND_SIGNAL
MODE: (VCC-1.5V) ~ 3.5V = MUTE
MODE: VCC ~ (VCC-0.5V) = STANDBY
G38 G39 G40 G41 G42 G43 G44 G45 G46
HEATSINK
GND_SIGNAL
TH-32/37LRT12
Main Board (13 of 15) Schematic Diagram
2
G49
1
2
1