Philips DVP3320/55 service manual No video picture, no sound, Yes Check the loaded circuit

5-10 Trouble shooting chart

No video picture, no sound.

No video picture,

no sound.

Check whether all the voltages	No
from the power board to the
decoder board are normal.
Yes

Check the loaded circuit

CVBS(R1 point) waveform

Check if the reset circuit consisting of CE3, D6 and R21 is normal (at a high level for tens of milliseconds, then constantly at 3.3V).

Yes

Check whether there is 27MHz signal output.

Yes

No

Change CE3, D6 and R21.

27Mhz waveform

No	Crystal oscillator Y2 and
	peripheral components
	are defected or eroded.

No

Check if there is 135MHz signal output on R31.

SDRAM(R31 PCLK) waveform

Yes

Check whether short-circuit or bad solder on U1,U3

No

Check if short-circuit and bad solder exist on Pin 60

Yes

Reconnect the component in

No

Check U2.

Yes