We perform this repair for $89 parts and labor at www.pcrepairhelp.net.
This Asus G531GT laptop came in with the symptom of only working on battery and being able to wiggle the tip of the ac adapter plug in just the right way to get it to work and power on. After some time this stopped working completely and the notebook was dead.
The Asus G531GT laptop is a soldered in port that requires the laptop to be completely taken apart to the motherboard to access it. It the needs to be de-soldered and a new jack soldered back on.