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L451
Q451
Q452
IC451
Q454
Q453
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
N
F901
3
4
3
4
3
10
LIVE CIRCUIT
HOT
AC CORD
TH-42PA20B/E
P and PF-Board Block Diagram
IC551
SUSTAIN VOLTAGE CONTROL
4
Vin
START
O.V.P
REG
T.S.D
Q455
Q457
Q456
Q651
Q650
IC552
PROCESS VOLTAGE CONTROL
4
Vin
START
O.V.P
REG
LATCH
T.S.D
O.S.C
15V
RL401
TV ON/OFF
PF2
P9
LINE
4
LINE
4
NEUTRAL
NEUTRAL
1
1
RL403
RUSH ON/OFF
5V
RL402
380V
T501
10
DRV.REG
Drain
=8.3V
3
9
Rg2
DRIVER
Rg1
7
2
LATCH
Source
6
OCP/FB
1
-
+
O.S.C
4
-
+
GND
5
70V
2
1
D565
IC550
T502
OUT
3
1
IN
1
2
2
3
DRV.REG
Drain
4
=8.3V
3
Rg2
DRIVER
Rg1
7
OCP/FB
1
-
8
+
9
2
Source
-
+
GND
5
HOT
D566
T401
8
D404
7
6
IC401
STANDBY
3
4
VOLTAGE
2
CONTROL
3
1
2
1
D408
HOT
IC402
COLD
ERROR
DETECT
17V
13.5V
12
14
15
Q557
17
18
19
20
Vsus
1
IC553
2
ERROR
DETECT
3
18
12V
17
15Vs
16
15
12V
14
13
15V
12
11
REGENERATIVE
10
CONTROL
Q552,3,4
IC554
IC555
AVR 5V
1
2
COLD
Vda
1
2
3
9
IC557
IC403
10
ERROR
AVR 5V
11
DETECT
7V
12
1
3
13
2
14
15
1
2
3
+
TVON/OFF
Q401
RUSH ON/OFF
Q403
5V
5V
Q402
P11
TO SS11
2
VSUS
VSUS
3
P2
TO SC2
190V
1
VSUS
2
VSUS
P10
Q555
1
DR15V
3
FAN SOS
4
5V
1
2
TO SC23
P23
3
DR15V
1
2
DR15V
IC558
ERROR
P5
TO PA5
DETECT
11
DR15V
1
12V
12V
2
3
5V
STB5V
4
7
+12Vs
8
+12Vs
P7
TO PA7
1
+15Vs
2
+15Vs
P25
TO D25
1
12V
2
12V
5
5V
P27
TO D27
1
RUSH ON/OFF
TV ON/OFF
2
Q404
3
M POWER
4
STB 5V
Q558
5
KILL SOS
6
FAN SOS
7
PS SOS
8
ALL OFF1
TO SS12
P12
VDA
1
2
DR15V
4
STB PS
TH-42PA20B/E
P and PF-Board Block Diagram
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