A sparking power adapter usually is the “Crackling sound” you hear when you put the 3 pin power plug into the adapter.  Now if the 3 pin cable has a loose connection inside the pin, then the contact is not perfect and the resulting “Crackiling noise” is the connection going on and off.  This usually happens over time, as cables are moved around, or pulled out.  cables going in and out of power supplies many times. The actual sound is coming from the point of cable plug connection, rather than inside the unit itself.

 

 

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