FULLY BRICKED? Have you tried holding R when turning on to access the recovery menu?
If you can't, then sorry bro, you can't unbrick 3k's. I have like two bricked 3004's and there's really nothing you can do. You can sell parts of it to get money. Or you can buy a broken one online for cheap (example broken screen) and just take the mobo of that and put it in your psp.