I took my psp apart in the last couple weeks. I had 2, and I was basically taking the 2 psps, taking the good parts, and making 1 fully functional 1. I think I lost over 10 screws, I broke the power connector, and broke a little piece that holds the screen ribbons in, as well as Punctured one of the Speakers(it is scratchy now).
I guess you learn though. Now I got WLAN, as well as a good battery. Analog is busted though. It kinda glitches out.
In the begining though, I messed both the psps up. After some time, I managed to find the problems and fix em.