My charging port may be broken

My laptop hasn't been able to be used for the past month. I believe the charger port may be broken. I'm not sure how to acess it from inside the motherboard. There may be a chance the negative is not getting a good touch of ground. Anyway, my point is that I don't know how the port is supposed to be and I can't acess it. Any help other than taking it to a shop is welcomed completely.