M8 S812 box power problems...

Hi guys
so my dilemma now is this

i sorted the M8 S812 out from bricked problems in my previous thread

i gave it back to my mate
who proceeded to stick the wrong PSU up it lol
he put his CCTV psu into it lol
12v 3A lololol
so ive just picked it back up
has anyone had any luck in fixing this problem before ?
im going to open it up this eve to see whats burnt
i can smell something lol

hopefully may be a diode or something lol

tho im not very hopeful this time

dave