Philips DVP3120 Series 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
Check whether
Check
there is 300V on C4.
Check whether 100KHz
oscillating
Pin6 of U1
Check if +5V, +12V, -12V
are short.
Check whether the components in the
short-circuit voltage are defected or eroded.
Yes
F1 is blown
No
whether
Yes
signal on
Yes
Yes
4-3
Remark: Trouble shooting chart for
DVP3120/51/55/94/75, DVP3120K/55/93/98
Yes
Replace F1
No
Replace C4 if D1, D2, D3, D4
are normal.
No
Check/ replace U1.
U1(PIN 3 - RC waveform)
No
Check whether U2 are eroded.
Trouble shooting chart
U1(PIN 8 - Drain waveform)