PSP 3000 Problem: Power Board

Hello,I have a PSP3000 that doesn't turn on. It had a fuse blown that I bridged and now boots only if I short the GND and power pin on the power on off board. While the console is turned on the green light is off and when it is turned off I can only see a dim orange led. If I try to use the power switch while I am in main menu it works like the hold button...I changed the power board but there is the same problem.

Also, somebody has been inside before. Is it surely a PSP 3000 board?

Any advice?