Ok I have a Samsung galaxy tab 3 10.1, recently it wasn't working so I ordered a new battery, replaced it, then it turned on but the port for the charger wasn't getting connection so I replaced it but now I'm stopped because it's 100% charged and it only stays on when I keep it plugged. But it SHUTS OFF when I unplug it . Could it be the power button?? Easy fixing? Any ideas please. Trying to fix it myself without spending $$$$$ to take it to a pro.