Clicking as soon as plug in

Hi there.
There is a large copper power relay coil at the back of these units, take the cover off the unit and locate the coil (is usually quite large) if you have to plug it it to identify the coil, then it has to be de-soldered from the main board and a new one soldered into place.
On the coil there will be identifying marks, most electronic component store sell the type of coil you need or can lead in the right direction.


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