Dell DC Brown wire
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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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Do you have a multimeter?
Take some measurements where are the front connections on these backside connections.
https://electronics.stackexchange.co...t-are-they-for
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