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Just a filter coil, but the question is why did it fry. I think J4800 is just for the LED and IR port so it should work without. Not sure though, can you confirm where the connector is for?
Fan is always running on full. What is causing that?
There are three sensor connectors on board. One is attachés to the harddrive closest to the top of the mini and is connected to the board. The other two is not connected as I only use one drive.