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AC INLET
!
AC CORD
GND
TH-37PA30E/TH-42PA30E
PF-Board Block Diagram
PF Tuner Power Supply
D920
IC920
C920
POWER CONTROL
Latch-stop
-
+
comp
VUL
OVP
comp
+
-
VOVP
Thermal
Shutdown
Z/C
R928
R927
1
Zero Current
Detection
On Dead Timer
C926
Stand-By
Vref
IF/B
2
F/B
-
+
R934
On Time Timer
R935
R929
C924
D926
C925
!
!
T8AH 250V
F901
LF904
AC120V
4
NEUTRAL
3
4
!
!
!
C901
R901
CF901
1
LIVE
2
1
PF1
T8AH 250V
!
F900
!
HOT
S901
COLD
!
CF902
DC187V
D925
C928
C922
400V
4
5
Vcc
D
Startup
UVLO
C921
comp
UVLO
+
+
comp
-
-
Vcc(start)
Vcc(startup off)
/Vcc(startup on)
/Vcc(stop)
Startup
L921
R
Q
R924
S
Peak
Burst Peak
#
Current
Current
Limit
Limit
S
Soft
Q
drive
R
S
Restart
Timer
GND
3
R925
D922
R940
IC921
!
FEED BACK
1
4
3
2
LF911
!
F902
R904
K5D312BK0012
T3.15AL 250V
!
!
NEUTRAL
LF915
LF909
3
4
3
4
!
!
!
C903
C915
C902
2
1
2
1
!
!
HOT
C910
C911
COLD
HOT
COLD
!
T920
18 P2
C972
14V(UN REG)
17
2
NC
S3
D971
16 PT
3
S4
C973
C970
15
NC
21V(UN REG)
14 P1
5
S1A
D970
13
6
NC
S1B
12 NC
C971
7
S2A
11
8
V2
S2B
10
V1
R970
!
C914
HOT
COLD
4
1
R971
2
3
R972
C975
R976
C974
3
R973
IC970
1
ERROR
REF_2.5V
VOLTAGE
R975
2
DET
!
RL901
STAND-BY 5V
D990
C990
R990
R992
Q990
HOT
COLD
POWER ON/OFF CONTROL
COLD
HOT
LIVE
HOT
COLD
TO PA10
PF10
5
UNR_14V
UNR_21V
1
2
UNR_21V
R974
7
STB_5V
9
AC_ON/OFF
TO P9
PF2
NEUTRAL
1
LIVE
4
TH-37PA30E/TH-42PA30E
PF-Board Block Diagram
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