Philips DVP3140 Service Manual page 30

No video picture, no sound.
Check whether all the voltages
from the power board to the
decoder board are normal.
Check if the reset circuit consisting
ofEC9, D1 and Q1 is normal (at a
high level for tens of milliseconds,
then constantly at 0V).
Check whether there is
27MHz signal output.
Check if there is 135MHz
signal output on R2.
Check if short-circuit and
bad solder exist on Pin
151
Reconnect the component in
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No video picture,
no sound.
Yes
Yes
Yes
SDRAM(R2 PCLK) waveform
Yes
Yes
Remark: Trouble shooting chart for
No
Check the loaded circuit
No
Change EC9, D1and Q1.
Crystal oscillator Y1 and
No
peripheral components
are defected or eroded.
Check whether
No
short-circuit or bad
solder on U2,U4
No
Check U1.
Trouble shooting chart
DVP3142(K/KM)/XX
DVP3144(K)/XX
CVBS(R21 point) waveform
27Mhz waveform
No
Yes