I have tried to charge my psp with a charger that I wired myself, but the charger blew a fuse now my psp wont charge with the proper charger, have I broke it.
If your home made charger passed enough current through something to ''blow'' the fuse then that something is probably beyond easy repair, if the Sony guys (who are not stupid) open it up and find totally burnt out components while the original charger is still OK they will know that you did something unusual to it.