Panasonic TH-42PA25U-P Service Manual page 260

PA
Speaker out,Regulator Board
IC2401
TO
AUDIO AMP
DG6 PA6
L IN 1 Q2408 32 L IN L OUT 20 Q2402
R IN 3 Q2410 1 R IN
SCL1 13 15 SCL1
R OUT 12
SDA1 SDA1
14 16
POFF DEF 19
Q2403
STB5V
Q2304
RESET
18
Q2303
Q2310
STB5V
Q2308
Q2311
MAIN DEF
20
SP MUTE 16 A MUTE
Q2309
TO P5 PA5
12V 12V
1 IC2304
12V 2 12V
AVR 9V
STB5V 4 STB5V
STB5V
+12Vs 7 1 3 9V
+12Vs
8
Q2306
5V 3
TO P7 PA7
+15Vs
1
+15Vs 3
PA24
IC7502
TXD
TXD 1
AVR 9.2V
RXD
RXD 3
SRQ 4 1
STB5V
5
LOADER
LOADER 7
IC7503
AVR 5V
PA23
SUB3.3V
1
SUB3.3V 1
SRQ
SRQ 2
SCL0
IC7504
SCL0 4
12V
SDA0
SDA0 5
AVR 3.3V
SCL3
SCL3
6
SDA3
SDA3 7 1
VPP
VPP 8 5
TO DG8 PA8
IC7505
VPP
VPP 8
SDA3
AVR 2.5V
SDA3 9
SCL3
SCL3
10
1
SDA0
SDA0 11
5
SCL0
SCL0 12
SRQ
SRQ 14
SUB3.3V
SUB3.3V 15
TXD
3
TXD
RXD
RXD
4
LOADER
LOADER 17
ICC CONT
ICC CONT
6
SDA3(PANEL)
SDA3(PANEL) 18
SCL3(PANEL)
SCL3(PANEL) 19
PA22 1 10 11 4 5 6 7 8 9 2 PA4 1 10
TH-42PA20U
PA-Board Block Diagram
IC2301
TO
HP AMP(L)
PA3 SPEAKER
IN OUT+
18 13 3 SP L+
BEEF OUT-
17 12 4 SP L-
AMP SP R+
1
25
STB SW
2 SP R-
HP IN HP OUT
Q2312
28 1
IC2302
HP AMP(R)
IN OUT+
18 13
BEEF OUT-
17 12
PA9 TO K9
AMP
25
STB SW 4 HP L
HP IN HP OUT
28 1 6 HP R
MUTE
9V
Q2305
TO
PA2
DG2
IC7581
TUNER 30V
SUB 9V
Q7582
3 5 1 BT 30V
Q7581
4
32 TV ON
2 Q7501 15 MAIN 9V
21 SUB 9V2
23 SUB 9V2
Q7502
SUB 5V
2 7
19 SUB 5V
2 11 MAIN 3.3V
13 MAIN 3.3V
Q7509 Q7510
25 MAIN 2.5V
27 MAIN 2.5V
Q7543 Q7504
36 AC ON/OFF
MAIN5V
Q7541 SOS
33
2
Q7542
PA12
TXD
1 TXD
RXD
3 RXD
STB5V
STB5V
5
12V
12V
7
PA21
TXD
1 TXD
RXD
3 RXD
STB5V
5 STB5V
12V
7 12V
11 4 5 6 7 8 9 2
TH-42PA20U
PA-Board Block Diagram