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4-11
No video picture, no sound.
Change EC9, D1and Q1.
No video picture,
no sound.
Check if the reset circuit consisting
ofEC9, D1 and Q1 is normal (at a
high level for tens of milliseconds,
then constantly at 0V).
Check whether there is
27MHz signal output.
Check the loaded circuit
Crystal oscillator Y1 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 135MHz
signal output on R2.
Check whether
short-circuit or bad
solder on U2,U4
SDRAM(R2 PCLK) waveform
Check U1.
No
No
Reconnect the component in
Yes
Yes
Check if short-circuit and
bad solder exist on Pin
151
Yes
No
Содержание DVP3136/94
Страница 34: ...Input Output Board Print_Layout Bottom Side for DVP3136 94 6 10 6 10 ...
Страница 35: ...Switch Board Print_Layout Bottom Side for DVP3136 94 6 11 6 11 ...
Страница 36: ...Amplifier Board Print_Layout Top Side for DVP3136 94 6 12 6 12 ...
Страница 37: ...Amplifier Board Print_Layout Bottom Side for DVP3136 94 6 13 6 13 ...
Страница 38: ...Front Board Print_Layout Bottom Side for DVP3136 94 6 14 6 14 ...
Страница 39: ...Power Board Print _Layout Bottom Side for DVP3136 94 6 15 6 15 ...
Страница 40: ...Main Board Print_Layout Top Side for DVP3136 94 6 16 6 16 ...
Страница 41: ...Main Board Print_Layout Bottom Side for DVP3136 94 6 17 6 17 ...