Philips DVP1120 Service Manual page 20

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 is normal (at a high level
for
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
tens of milliseconds, then
Yes
Check whether there is
27MHz signal output.
Yes
SDRAM(R2 PCLK) waveform
Yes
Yes
4-9
No
Check the loaded circuit
No
Change EC9, D1.
Crystal oscillator Y1 and
No
peripheral components
are defected or eroded.
No
Check whether
short-circuit or bad
solder on U2,U4
No
Trouble shooting chart
CVBS(R21 point) waveform
27Mhz waveform
No
Check U1.
Yes