Panasonic TH-42PX20U-P Service Manual page 176

PF-BOARD TXNPF1QKSU
!
A
!
C990
B
RL901
50V
10u K6B1ADA00023
Q990
2SD13280TL
R990
3.3k
R992
47k
COLD
C
R994
0
JS70
JS73
R993
0
TO
P-BOARD
(P9)
D
N
PF2
!
ZA901 C910
1
K4ZZ01000121
220p
!
=
C903
250V
3
1u
4
LIVE
C911
220p
!
E
TH-42PX20U-P
PF-BOARD Schematic Diagram
1
!
D920
C920
B0EBNT000002
200V
560u
IC920
C0DACZH00002
POWER CONTROL
Thermal
Shutdown
3.9k 100
Z/C
R928 R927
1 Zero Current
Detection
On Dead Timer
100p
C926
Stand-By
50V
F/B
2
<
!
4 1
* * On Time Timer
LF911
G0B353G00001
3 2
50V
* *
D926
MA3X152K0L
TP903
T3.15AL-250V
R904
1.8
!
F902
K5D312BK0012
!
!
C915
LF915
250V
0.22u
G0B123K00001
!
!
C917 C916
1000p 1000p
2 3
DC187V
TP904
C923
R922
0.01u
220k
400V
DC400V
2W
R923
10
TP901
D925 L920 D921
B0HCMM000001 G0ZZ00001937 B0EAKT000018
C928 C922
400V
25V 50V
* *
0.1u
220u
*
4 5 400V
Vcc
D
Startup
Latch-stop UVLO
- UVLO
comp
+ comp + + comp
- -
VUL
Vcc(start) Vcc(startup off)
OVP /Vcc(stop) /Vcc(startup on)
Startup
comp
+
R
-
Q
VOVP R924
S
Peak Burst Peak L922
22
C921 EXCELDR35V
Current Current
1500p
Limit Limit #
2kV
1/2W
S
Soft
Q
drive
Vref
R
S
IF/B
- Restart
+
Timer
GND
3
C925
50V
2200p
HOT
1%
R925 1%
R926
D922
10k
9.31k
MAZ31000ML
LIVE CIRCUIT
R940
6.8k
JS9
JS10
!
!
C902
LF909
250V
G0B123K00001 0.22u
JS11
JS12
HOT
COLD
4 5
!
T920
ETS29AK7E6AD
C972
1kV
=
330p
GT GT
L972
D971
18 P2
0 B0HAPM000012
*
C973
25V
17 NC S3 2
1000u
16 PT S4 3
1kV
C970
330p
15
NC L970
400Vp
EXCELSA24T
=
-140Vp
14 P1 S1A 5
* *
* -140Vp
D970
13 NC S1B 6
FMLG12SLF118
C971
25V
12 NC S2A 7
3300u
11 V2 S2B 8
TP979
10 V1
R970
!
560
C914
470p
C975
R972 50V
100 0.047u
C974
2200p
R973
1k
COLD
REF_2.5V
IC970
AN1431M-E1
ERROR DET
!
IC921 4 1
B3PAA0000261 R971
470
2
3
!
K5Y802B00001
!
LF904 !
C901
!
R901 250V
G0B123K00001 CF901
=
1M
ERZV10V621P2
!
K5Y802B00001
T8AH 250V
S901
!
J0LT00000009
CF902
!
ERZVG7Z361
6
TP977
10u
L973
TP978
L971
10u
TO
PA-BOARD
(PA10)
PF10
1
NR_20.5V
2
NR_20.5V
3
GND
4
GND
5
NR_14V
6
GND
7
STAND-BY 5V
8
R976 GND
2.2k
R974
9
16.9k PF_AC_ON/OFF
1%
10
GND
R975
2.32k
1%
T8AH 250V
F901
N
AC
4
NC
3
!
GND
1u 1
AC
LIVE PF1
F900
AC CODE
TH-42PX20U-P
PF-BOARD Schematic Diagram
7 8