Sony HS75 Service Manual page 28

Panel Control Circuit:
The high level output from PIN67 of U201 makes Q402 break through, Q203 break through and offer
5V to panel when work well. The output is low level when it's saving energy state and Q402 break off, Q203
break off, so the panel doesn't work.
(3) PPWR
Vcc+12V
R403
100K 1/16W
R405
1
10K 1/16W C403
0.1uF
+5V
R401
0 1/10W
C405
0.068uF
R404
1
100K 1/16W
Q402
PMBS3904
GND
28
HS75 Sony
+3.3V
R402
NC
2
Q203
VDDD
AO3401
3
C404
0.1uF
GND