lol welcome to modding kiddies lol
but what i have learneds is to use krazy glue on my solder points (not where i solder them to to get power becuase unsoldering them is such a pain in mya ss its not funny)
but yea as u add stuff back into ur psp, i.e. motherboard powerboard check the leds periodicaly and when it shorts u knwo whats doing what so u have a better idea what to look for that could be shorting it. i learned to put electrical tape on the back of my lcd cage where wires might touch lol