Panasonic TH-42PX20U-P Service Manual page 193

14.4. PF-Board Schematic Diagram
PF-BOARD TXNPF1QKSU
!
A
C990
B
50V
10u
Q990
2SD13280TL
R990
3.3k
R992
47k
C
R994
0
JS70
JS73
R993
0
D
ZA901
K4ZZ01000121
E
TH-42PX20U-P
PF-BOARD Schematic Diagram
1
!
RL901
K6B1ADA00023
COLD
TO
P-BOARD
(P9)
N
PF2
!
C910
1
220p
!
=
C903
250V
3
1u
4
LIVE
C911
220p
!
2
!
D920
B0EBNT000002
3.9k
R928
100p
C926
50V
<
!
4 1
* *
LF911
G0B353G00001
3 2
* *
T3.15AL-250V
R904
1.8
!
F902
K5D312BK0012
!
!
C915
LF915
250V
0.22u
G0B123K00001
!
C917 C916
1000p 1000p
3
C920
200V
560u
IC920
C928
25V
C0DACZH00002
220u
POWER CONTROL
Latch-stop
UVLO
-
comp
+ +
comp
-
VUL
Vcc(start)
OVP
/Vcc(stop)
comp
+
R
-
Q
VOVP
S
Thermal
Shutdown
100
R927 Z/C
1 Zero Current
Detection
On Dead Timer
S
Stand-By
Vref
R
IF/B
F/B
2
Restart
-
+ Timer
On Time Timer
50V
C925
D926
50V
MA3X152K0L
2200p
R925
10k
TP903
!
LF909
G0B123K00001
!
DC187V
TP904
TP901
D925
L920
B0HCMM000001 G0ZZ000019
C922
50V
*
0.1u
*
4 5 400V
Vcc
D
Startup
UVLO
+ comp
-
Vcc(startup off)
/Vcc(startup on)
Startup
Peak Burst Peak
C921
Current Current
1500p
Limit Limit
2kV
Soft
Q
drive
S
GND
3
1%
1%
R926
D922
9.31k
MAZ31000ML
R940
6.8k
!
C9
2
0.2
4
66