qm3-7408-000

HI, Everything is in the title I'm looking for a QM3-7408-000 (the logic board for an MG5250, in fact any MG5200 series). Or does anyone knows where the fuse is located. I've changed the QK1-5862-000 (K30314) but it's not the problem, as the printer won't turn ON, next is the logic board...