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remove every mod and turn the board back to normal and then read this http://www.llamma.com/PSP/repair/PSP_fuse_repair.htm
Problem - PSP wont start /Charge with / without the battery and AC adapter.What have i tried - 1. i have checked all the fuses on the board for continuity and they seem to be fine.2. i plugged in the PSP for overnight.Mod - i connected another 3.5m jack to the speaker pins on the board.somethings i noticed.before conecting the 3.5mm jack i tested the amp just to check if it gives the bang that i was looking for so i directly connected the tothe speaker pins on the mobo*the amp was powered from external source. it worked but i noticed that the LCD was getting hot so i removed the connections.then i all the connections and tried to start the PSP it didnt start, so opened it up and found that if a move the ribbon cable (one that goes to the power switch) a bit it used to work, some times it used to start but without the LED's** thsi is with the AC adapter plugged inat this time if tried to insert the battery and start it wouldnt , sometimes it would and it would show as External power in battery info.while moving the ribbon cable i was trying to find a perfect position for it and suddenly everything went off completely.after that i am still trying to power it up but no luck, i checked the battery is charged. the AC adpater is working.** just forgot to mention the in this process i accidently dropped the battery.
at start i also thought i might be the power fuse.but then after post i remembered that last time when changed the screen that guy had changed the power switch and the ribboncable tooo.so thought that would be the problem checked it and that it was !!!!!Post Merge: February 02, 2011, 03:56:34 AMFound the root cause of my problem.the ribbon cable that goes to the power circuit board had a problem, the problem was that the hard plastic film that is with the cable for support had moved forward, so coz that the pins never came in contact with the pins on the connector, just trimmed off the access plastic and inserted the ribbon cable and it worked just awesome.