Advertisement
No video picture, no sound.
No video picture,
Check whether all the voltages
from the power board to the
decoder board are normal.
Check
if
consisting
D2,L30 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 115MHz
signal output on L7.
All manuals and user guides at all-guides.com
no sound.
Go
Yes
the
reset
circuit
of
CE17,
R47,
Yes
Yes
SDRAM(L7 SDCLK) waveform
Yes
Check U4.
4-9
No
Check the loaded circuit
CVBS(R85 point) waveform
No
Change
CE17, R47, D2,L30
Crystal oscillator Y1 and
No
peripheral components
are defected or eroded.
No
Check whether
short-circuit or bad
solder on U3, U6
Yes
Reconnect the component in
short-circuit
Trouble shooting chart
27M waveform
No
Advertisement
