Philips DVP3680KX Service Manual page 13

All output voltages on the power board is 0V or deviated.
All output voltages on
the power board is 0V or
deviated
Yes
Check whether
F501 is blown
No
Check whether there is
300V on C501 or C502.
Yes
Check whether 100KHz
oscillating signal
Pin4 of U501
Yes
Check if +5V short.
Yes
Check whether the components in the
short-circuit voltage are defected or eroded.
4-3
Yes
Replace F501
Replace C501&C502 if D501, D502,
No
D503, D504 are normal.
No
on
No
Check/ replace U501.
U501(PIN 4 - Drain waveform)
Check whether U501 are eroded.
Trouble shooting chart
Free Datasheet http://www.datasheet4u.net/