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No video picture, no sound.
Check
voltages from the power
board to the decoder board
are normal.
Check
consisting ofEC9, D1 and Q1 is
normal (at a high level for tens of
milliseconds, then constantly at
0V).
Check if there is 135MHz
signal output on R2.
Check if short-circuit and
bad solder exist on Pin
151
Reconnect the component in
No video picture,
no sound.
Go
whether
all
the
Yes
if
the
reset
circuit
Yes
Check whether there is
27MHz signal output.
Yes
Yes
Yes
1-10
No
No
Crystal oscillator Y1 and
No
peripheral components
are defected or eroded.
No
SDRAM(R2 PCLK) waveform
No
Trouble shooting chart
Check the loaded circuit
CVBS(R21 point) waveform
Change EC9, D1and Q1.
Check whether
short-circuit or bad
solder on U2,U4
No
Check U1.
Yes
27Mhz waveform
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