Optical In Does Not Work - Philips HTS3531/12 Service Manual

OPTICAL IN does not work

OPTICAL in does
not work
Go
Check voltage at P2 PIN1:5V on Main
Board whether normal or not
Yes
Check Main Board P2 PIN3 signal input
whether right or not
Yes
Replace U1
5-10
No
Refer to Power Board CN502
No
Check Main Board C106,
Trouble shooting Chart