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 if there is 135MHz
signal output on R2.
Check if short-circuit and
bad solder exist on Pin
151
Reconnect the component in
No video picture,
no sound.
Yes
Yes
Check whether there is
27MHz signal output.
Yes
SDRAM(R2 PCLK) waveform
Yes
Yes
4-20
No
Check the loaded circuit
No
Change EC9, D1and Q1.
Crystal oscillator Y1 and
No
peripheral components
are defected or eroded.
No
No
Trouble shooting chart
Remark: Trouble shooting chart for
DVP3142(K/KM)/XX
DVP3144(K)/XX
CVBS(R21 point) waveform
27Mhz waveform
Check whether
short-circuit or bad
solder on U2,U4
No
Check U1.
Yes