Yes it's the power switch socket located at the upper left on the logic board. It's hard to solder back the socket in place but you can solder the blue and white wires directly to the solder pads where the socket was fixed. Apply a little liquid flux on each pad then, with the solder iron, a small drop of solder on each pad (be careful to not bridge the two pads. Then skin the blue and white wires a bit, with the solder iron apply a little solder to the skinned wires edges and again flux to the solder pads, place the wires one at the time over their good location on the logic board pads (be aware of the cables and pads polarity) then solder them to the pads. I've done it many times with good results. Easy way to salvage a logic board.