Hitachi 42HDT51M Service Manual page 61

31. PROTECTION CIRCUIT BLOCK DIAGRAM (AVC)
AVC5-U AV P.W.B
AC INLET
Fuse F901
5A/125V
AC in
120V
To frame
GND
rectifier
Reg. SI-3090KM SW+9.0V
I5P1
Reg. SI-3090KM
EPG+9.0V
I403
FPG+9.0V-1
Reg. SI-3012KS
I404
Photo-
coupler
I903
Standby
Standby
rectifier
DC/DC converter
D907 H901
Relay
S901
(Detect
Voltage-down)
Fuse F902
2.5A/125V
Main
Main
Switching
D901
-regulator
T901
Switching
Photo-
regulator
coupler
I901
I902
LIVE COLD
Reg. TK11125CS
Reg. SI-3050LSA
Reg. SI-3012KS
Reg. TK11150CS
DM+9.5V
AC-Clock
POWER1
Reg. SI-3033LSA
Relay Protection
driver circuit
Q930
SW
D949
Q934
>6.7V
D946
D950
<2.9V
>6.0V
FE+30V
D952
<3.2V
D955
<3.2V 16V
DC/DC converter
I933
DC/DC converter
I931, D947, L932
Error
DC/DC converter
Amp.
Q932,
D937
DC/DC converter
IP05, DP15, LP03
DC/DC converter
IP01, DP08, LP01
DC/DC converter
IJ12, DJ43, LJ281
SW+9.0V
SW+5.0V
61
PT5-G/PW1-H
SW+3.3
V
SW+2.5V
IV01
SW+5V
I3P2
FAN+5.0V
IP04
+5.0V
I103
Reg. TK11133CS +3.3V
I104
SW+5.5V
SW+3.3V
STB+3.3V
I204
STB+5V
Q931, D940
(Detect
Voltage-over)
+9.5V
SW+3.3V
D+1.8V
D948
>9.9V
SW+5.5V
FSTBY+5V
I934
DP12
>9.9V
DM+5.5V
DP11
>6.7V
DM+3.3V
DP03
DM-5.6V
>0V
SW+3.3V
AVC5-U HDMI P.W.B
FC4
DM