Ok.. One of two things could be happening.. Possibly three.
One, the charging port on the tab itself could be dirty, and need to be cleaned. So i suggest taking a tooth pick and a cotton swab.
Use the tooth pick to clean out around the outside of the charging port, and very gently on the inside of the charging port.
There are small copper pins inside the charging port, you dont want to bend or break them. The, t ake the cotton swab with a si ngle drop of rubbing alcohol or index and try to clean the charging port and the tiny pins inside it with the qtip.
If that doesnt allow it to charge. Unplug the tab Hold down the power button till the tab turns off.
Then, with the tablet off. Plug the charging cord in.. Does the charging light come on?
If not, you either need to replace the charging cord, or the internal battery.
You can get a new charging cord here at a discount http://amzn.to/2fTvnIX
And you can get a new battery here http://amzn.to/2fTwNmH
And that comes with instructions, the battery, and all the tools you need to replace the battery.
if you have further questions, let me know!
I strive to provide great service, and greatly appreciate a 5 star rating clicked and submitted when you are satisfied.. I always answer follow up questions.
Senior Technician and Network Switching Systems Operator / Maintainer.