It is more than lightly that there has been a voltage spike and that the T 3.15A fuse mounted directly on the PCB near the power socket has blown. You need soldering experience and a good idea of what you are doing to dismantle the unit to test that this is the case. There is is sometimes a varistor blown too and it is a good idea to at least check - if not replace - the bridge rectifier and two adjacent 100mf 400v capacitors too. Hope some of that helps.