Toshiba SD-170EKB2 Servicehandleiding - Pagina 13

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Toshiba SD-170EKB2 Servicehandleiding
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
ofEC9, D1 and Q1 is normal (at a
high level for tens of milliseconds,
then constantly at 0V).
Reconnect the component in
No video picture,
no sound.
Go
Yes
Yes
Check whether there is
27MHz signal output.
Yes
Check if there is 135MHz
signal output on R2.
Yes
Check if short-circuit and
bad solder exist on Pin
151
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