In our case we have a bad connection to the mains adapter, I'm trying to figure out whether it's:
a) the socket on the board (to me it looks OK, sturdy) or
b) the plug on the cable.
On the plug, one of four gold pins *may* be missing.
There's certainly space for a fourth (two either side of the plastic guide pin).
Adapter here is Rexon AC-005.
Please, can anyone advise whether this type of adapter should have three or four pins?