Table of Contents
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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
of D3 and CE6is normal (at a high
level for tens of milliseconds, then
constantly at 0V).
Checkifthere is 128MHz
signal output on R81
Check if short-circuit and bad
solder exist on Pin Y1
Reconnect the component in
short-circuit
No video picture,
no sound.
Yes
Yes
Check whether there is
27MHz signal output.
Yes
SDRAM(R81 SDCLK) waveform
Yes
Yes
5-10
No
Check the loaded circuit
No
Change D3, or CE6
Crystal oscillator Y1 and
No
peripheral components
are defected or eroded.
Check whether short-circuit
No
or bad solder on U3
No
Check U1.
Trouble shooting chart
CVBS(L26 point) waveform
27M waveform
Yes
No
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