There are 3 pins on the back of this DC jack. Centre both left and right edges are the grounds for the black wires and a centre bottom is for the red wire. Where does the brown wire solder to? 
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The ground are indeed the ground wires.
The reds will be the power wires to supply the ~19v to the logic board.
The brown wire will be the PS_ID (power supply ID) communication line and will mate with the needle like center pin inside the DC jack. This is a 1-wire interface line used by the EC to gauge if the power adapter is suitable to power the motherboard. -
Thank you. I can't see where it should solder onto on the back of the jack. There are only 3 points - the 2 grounds and the 19v.Comment
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Why do you think that there are 2 grounds?
Do you have a multimeter?
Take some measurements where are the front connections on these backside connections.
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I am hoping someone may be able to help me.
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