Sony S75F Service Manual page 30

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.
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, and the higher the brightness.
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S75F Sony