Philips DVP5990K, Service Manual, Page: 21 / 42

4-10
No video picture, no sound.
Change D3, or CE6
No video picture,
no sound.
Check if the reset circuit consisting
of D3 and CE6is normal (at a high
level for tens of milliseconds, then
constantly at 0V).
Check whether there is
27MHz signal output.
Checkifthere is 128MHz
signal output on R81
Check the loaded circuit
Crystal oscillator Y1 and
peripheral components
are defected or eroded.
Check whether short-circuit
or bad solder on U3
Check if short-circuit and bad
solder exist on Pin Y1
No
No
No
No
No
Yes Yes
Yes
Yes
Yes
Reconnect the component in
short-circuit
Check U1.
Yes
No
27M waveform
SDRAM(R81 SDCLK) waveform
Trouble shooting chart
Check whether all the voltages
from the power board to the
decoder board are normal.
CVBS(L26 point) waveform