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Another thing, I tried to put the 3.6 V onto the terminals, but the PSP didnt turned on. Does the middle pin sends data, or my PSP motherboard is trashed?

Hey, i'm new in this, and recently, my PSP stopped charging the battery; it don't turn on, and the battery isn't dead, it gives me with a multimeter 3.6 V, but I think the probrem is caused by the middle pin, ¿what is the use of it? ¿does it send data about battery status? ¿if this is the problem, c...