a couple of days ago my friend gave me his "old" pmp3000 because it dident work (i once repaired his iphone so i must be a tech god). as i then proceeded to plug it in to test the thing for myself it shorted my whole house (main relay).

naturally i check the fuse, curcuit and psu with no luck. the curcuitry is split in three main compartments, the power input, the main curcuit and the amps (as far as i can tell). i have diagnosed it to be the main curcuit (foto).
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what are my options and how do i proceed. my skill and budget are limited.

kind regards