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jango2
 
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Default Vintage Sony discman d-7 dead

The silver box might be a dc to dc convertor. You could start by
confirming the door close switch is ok. Next , if the function pcb is
on top of the lid , i'd look for a break in the connector or flex pcb
linking it to the main circuit board. I had a case once when the faulty
component was simply a defective play switch.
Jango