Sony HS75 Service Manual page 29

On/Off /Brightness control circuit:
ON/OFF control: When it works well, the high level output form PIN 68 of U201, and low in saving energy
state.
Brightness control: When it works well, the output PWM pulse from PIN98 of U201 adjusts the brightness,
the bigger the duty, the higher the brightness.
CN301
GND
1
GND
3
VCC12V
5
GND
7
+5V
9
GND
11
CONN
+5V
R301
1K 1/16W
(3) PWM0
Brightness
ON_OFF
2
DIM
4
6 VCC12V
GND
8
10 +5V
GND
12
R302
1K 1/16W
C301
1uF/25V
GND
1
GND
3
VCC12V
5
GND
7
+5V
9
GND
11
Interface of main board and PWPC board
Vcc+12V
SMAL240LVXRO
D309
C302
C303
+
100uF/25V 0.1uF
C328
1uF/25V
CN301
2 ON_OFF
DIM
4
6
GND
8
10 +5V
GND
12
CONN
29
HS75 Sony
R316
C304
VCC5V+
+5V
0.1uF
VCC12V Vcc+12V
4.7K 1/16W
PBIAS