I think this will be a very difficult job.I am pretty sure it involves removing the mother board to get to the power socket.This of course involves complete disassembly of your laptop.
Check out this tutorial to see if your Dell model is similar to the ones shown in the tutorial...good luck.
http://www.insidemylaptop.com/remove-motherboard-repair-dc-power-jack-dell-inspiron-1300-b120-b130-laptop/
Mike, January 2010
