Panasonic TH-42PA25U-P Service Manual page 259

L451
Q452 Q451
IC451
Q453 Q454
3 8
6
4
D451
! POWER
FACTOR
CONTROL
P
Power Supply Board
PF
Line Filter Board
! ! !
PF1 ! LF904 LF909 LF915
F900 LINE
2 1 2 1 9 8
LINE
1
L.F L.F L.F
4
N
! F901
3 4 3 4 3 10
LIVE CIRCUIT HOT
AC CORD
TH-42PA20U
PF and P-Board Block Diagram
IC551
SUSTAIN VOLTAGE CONTROL
4
Vin
START
REG
T.S.D
Q455
Q456
Q651
Q650
IC552
PROCESS VOLTAGE CONTROL
4
Vin
START O.V.P
REG
T.S.D
15V
RL401
!
TV ON/OFF
PF2 P9
LINE
LINE
4 4
NEUTRAL
NEUTRAL
1 1
N
!
RL403
RUSH ON/OFF
5V
RL402
!
380V
DRV.REG
Drain
=8.3V
3
Rg2
O.V.P
DRIVER
Rg1
2
LATCH Source
OCP/FB
1
-
+
O.S.C
-
+
GND
5
70V
Q457
! D565
IC550
OUT
3
1
IN
2
DRV.REG
Drain
=8.3V 3
Rg2
DRIVER
Rg1
LATCH
OCP/FB
1
-
+
O.S.C
2
Source
-
+
GND
5
HOT
!
D566
!
D404
IC401
STANDBY
3
VOLTAGE
2
CONTROL
1
! D408
HOT
IC402
COLD
ERROR
DETECT
17V
13.5V
!
T501
10
9 12
7 14
6 15
4 17
18
2 19
1 20
Vsus
1
IC553
!
2
T502 ERROR
DETECT 3
1 18
12V
2 17
15Vs
3 16
4 15
12V
14
13
15V
7 12
8 11
REGENERATIVE
CONTROL
9 10
Q552,3,4
IC554
COLD
1
Vda
1
2
!
T401
3
8 9
IC557
7 10
ERROR
6 11 DETECT
7V
12
4 13
3 14
2 15
1
1
2
3
+
TVON/OFF
Q401
RUSH ON/OFF
Q403
5V
5V
Q402
TO SS11
P11
2 VSUS
3 VSUS
TO SC2
P2
190V
VSUS
1
2 VSUS
P10
Q557 Q555
1 DR15V
3 FAN SOS
4 5V
1
2
P23 TO SC23
3
1 DR15V
2 DR15V
IC558
ERROR TO PA5
P5
DETECT
DR15V
11
1 12V
2 12V
3 5V
4 STB5V
7 +12Vs
8 +12Vs
TO PA7
P7
+15Vs
1
2 +15Vs
TO D25
P25
IC555
12V
1
AVR 5V 2 12V
2 5 5V
P27 TO D27
RUSH ON/OFF
1
IC403
2 TV ON/OFF
AVR 5V
Q404
3 M POWER
1 3 4 STB 5V
Q558
2 5 KILL SOS
6 FAN SOS
7
PS SOS
8 ALL OFF1
TO SS12
P12
VDA
1
2 DR15V
4 STB PS
TH-42PA20U
PF and P-Board Block Diagram