Dell Inspiron B130

Dell's Inspiron B130 is very similar to the 120, 1000, 1100, 1200, 2000, 2200, and latitude 120L laptops that use this same 2.5mm six pin jack. All of these models have this problem. The most common unless physically broken is the burnt voltage pin in the back. You can usually do the wiggle trick to get a laptop with the burnt voltage pin to keep charging. Eventually this will stop working and you run the risk of breaking or frying the motherboard.
The disassembly of these laptops is fairly easy. You start by taking out all the bottom screws, hdd cover, ram/wifi cover, battery, and (once certain bottom screw is out) optical drive.
The back has two screws that need to be removed.
You can now lift the power button bezel out that gains access to the two keyboard screws. Remove those and carefully undo the ribbon cable and now you can take out the keyboard.
The wireless lead needs to be removed along with the lcd cable. Once that's completed you can lift out the lcd panel.
I call the area under the keyboard the "top plastic". All the screws can be removed from this area along with with the touchpad ribbon cable, cmos battery, and the cable that turns off the lcd when you close the lid. When all these screws have been removed you can take off the top plastic and gain access to the motherboard.
Remove all the screws on the motherboard that have a triangle next to them. You can now lift the motherboard out of the "bottom plastic" and have access to the dc jack. Soldering of the power connector can start.