Philips DVP3800 Service Manual page 19

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 U1
Yes
Check if +5V and +12V are
short.
Yes
Check whether the components in the
short-circuit voltage are defected or eroded.
Yes
No
No
on
No
4-3
Replace F501
Replace C501&C502 if D501, D502,
D503, D504 are normal.
Check/ replace U1.
U1(PIN 4 - Drain waveform)
Check whether U1 are eroded.
Trouble shooting chart