Solder AC to laptop? Wiring code ?

Hi,



the AC connector on the laptop has gone- cant bother

get/install new socket. Want to solder connect the power/transformer

cable directly to the sockets wires.(' DC in cable' in manual ) There are

5 wires internally (2 red 2 black, 1 blue) going to the socket but

only two, no ground coming in. I could pair the reds and the blacks but what do

I do with the blue ? The pin in the center of the socket is + and the outer ring is -.

Its an old Thinkpad but their forum seems to be dead/defunct.

Please see photo- thanks.



No photo - "There was a problem uploading your file "



Please Help.



Thanks!



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