Hello to everyone! I've received as a gift two dead rpi2s. One is still to troubleshoot and it isn't the matter of discussion here. The other, when connected to a suitable power supply I've been using for years with another rpi2, gives only solid green led (no red led at all) and just after a couple of seconds the BCM SoC becomes so hot that it isn't possible to touch it.
Is there anything to do like measuring voltages on GPIO, cutting off diodes, anything else or do I just need to recycle it? I have to say I fear the latter... Thanks to everyone for your advices!