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It's a run of the mill PNP Transistor, MMBT3906.
Yeah, none of that makes any sense grammatically, so I have no real idea what the exact issues is or what you have done there. If the thing works on USB then U1, U2 and U3 on the Power Board are all fine. All U1 does is step down the USB 5v to 3v for U2 and U3 to use anyway.I have no idea where you are injecting this 3.2v power source to make the controller 'work' so for all I know you have dead AA batteries or don't have them connected in series to the AA posts.First thing to try is plug it up over USB and see if the Guide button works. If the Guide button does not work, then the issues is most likely around that circuit, D27, Q8, Q9 and everything in between, because if Guide does not work then it can not turn the controller on over AA power. If the Guide button does work on USB, then there are only a handful of components between the AA + post and U2/U3 for that to work. L1 is the main thing that can get knocked off the board, also D26, then the PCB can also crack around L1 breaking a trace and causing it to not work on batteries.
Pretty sure that guy knows more about electronics than you do about hand tools, as any screwdriver, including the drink, would have made a mess of the pads, traces and board there. U11 - Correct, same as U10C37 - 1uF, same as C33, anything rated 6.3v or more is fineC38 - 470nF, same as C36, again anything 6.3v up is goodR42 - Correct All of the aforementioned components are 0402 sized.