Motherboard problem, broken track.

Hi, my background is in electronics but found working on micro=electronis without circuit diagram difficult. Took this on as a favour for a friend. The DC socket was badly damaged such that the pin on the motherboard was so slack that I thought the track would be damaged. Sure enough I got a new DC socket fitted but still not charging up, there must be an open-circuit from the through-hole plating to the first component (probably pull-up resistor) the charging LED that emits when the Mains charger is fitted. Need to find out from circuit diagram or motherboard where the central pin is linked to. Can anyone help?

Just realised my typing error! Should read BROKEN TRACK!