Philips DVP3126/94 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
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
No video picture,
no sound.
Go
Yes
if the reset circuit
Yes
Yes
SDRAM(R2 PCLK) waveform
Yes
Yes
4-10
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
CVBS(R21 point) waveform
27Mhz waveform
Check whether
short-circuit or bad
solder on U2,U4
No
Check U1.
Yes