Philips DVP3560K, Руководство по обслуживанию, Страница: 22 / 41

5-10
No video picture, no sound.
Change CE7, D2.
No video picture,
no sound.
Check if the reset circuit consisting
ofCE7, D2 is normal (at a low level
for tens of milliseconds, then
constantly at 3.3V).
Check whether there is
27MHz signal output.
Check the loaded circuit
Crystal oscillator Y2 and
peripheral components
are defected or eroded.
No
No
No
Yes
Yes
Yes
27Mhz waveform
Trouble shooting chart
Check whether all the voltages
from the power board to the
decoder board are normal.
CVBS(R21 point) waveform
Check if there is 128MHz
signal output on R67.
Check whether
short-circuit or bad
solder on U4,U5
ˈ
U8
ˈ
U7
SDRAM(R67 DCLK) waveform
Check U20.
No
No
Reconnect the component in
Yes
Yes
Check if short-circuit and
bad solder exist on Pin
98
Yes
No