Table of Contents
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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 the reset circuit consisting
of C88, R80 and D1 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 93MHz
signal output on R89.
Yes
Check if short-circuit and bad
solder exist on Pin Y3
Reconnect the component in
short-circuit
All manuals and user guides at all-guides.com
4-10
no sound.
Yes
Yes
Yes
SDRAM(R82 SDCLK) waveform
Yes
No
Check the loaded circuit
No
Change C88, and R80.
Crystal oscillator Y1 and
No
peripheral components
are defected or eroded.
Check whether short-circuit
No
or bad solder on U7, U17
No
No
Check U3.
Trouble shooting chart
CVBS(R85 point) waveform
27M waveform
Yes
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