Philips DVP3800 Service Manual page 26

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
ofCE1,Q1,Q2 is normal (at a low
level for tens of milliseconds, then
constantly at 3.3V).
Check whether there is
27MHz signal output.
Check if there is 135MHz
signal output on R193.
Check if short-circuit and
bad solder exist on Pin
72
Reconnect the component in
No video picture,
no sound.
Yes
Yes
Yes
SDRAM(R193 DCLK) waveform
Yes
Yes
4-10
No
Check the loaded circuit
No
Change CE1,Q1,Q2.
Crystal oscillator Y1 and
No
peripheral components
are defected or eroded.
No
Check whether
short-circuit or bad
solder on U176,U186
No
Trouble shooting chart
CVBS(R884 point) waveform
27Mhz waveform
No
Check U1.
Yes