Philips DVP3120 Series 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 ofCE17, D2
L25 and R43 is normal
Check whether there is
27MHz signal output.
Check if there is 135MHz
signal output on L7.
Check if short-circuit and
bad solder exist on Pin
175
Reconnect the component in
No video picture,
no sound.
Go
Yes
Yes
Yes
SDRAM(L7 PCLK) waveform
Yes
Yes
4-20
No
Check the loaded circuit
No
Change CE17 D2 L25 R43,
Crystal oscillator Y1 and
No
peripheral components
are defected or eroded.
No
No
T rouble shooting chart
Remark: Trouble shooting chart for
DVP3120/05/12
CVBS(R76 point) waveform
27Mhz waveform
Check whether
short-circuit or bad
solder on U4,U7
No
Check U1.
Yes