Philips DVP520/00 Service Manual page 19

No video picture, no sound.
Check whether all the voltages
from the power board to the
decoder board are normal.
Check whether the reset circuit
consisting of C1, R1 and D1 is
normal (at a high level for tens of
milliseconds, then constantly at 0V).
Check whether there is
27MHz signal output.
Check
93MHz signal from R82.
Check whether short-circuit and
bad solder on Pin Y1 and Y6 of U4
to the subsequent filter circuit.
Reconnect the component in
short-circuit
No video picture,
no sound.
Yes
Yes
Yes
whether there is
SDRAM (R82 SDCLK) waveform
Yes
Yes
4-10
No
Check the loaded circuit
No
Change C1, D1 and R1.
Crystal oscillator Y1 and
No
peripheral components
are defected or eroded.
Check whether short-circuit
No
or bad solder on U7, U8 or
U9, SDRAM, U6 U7.
No
Check U4.
Trouble shooting chart
CVBS(R85 point) waveform
27M waveform
Yes
No