My Tablet isn’t charging

So my Samsung Galaxy’s Tab A’s screen was shattered. It was working even after the screen was shattered. But it stopped charging after a while. I changed the screen and battery but it’s still not charging. I have a portable charger that normally indicates when it’s discharging but when I use it to charge the tablet, it doesn’t indicate any discharge. My initial thought is that the charging connection was damaged, but I have no clue how to test it or fix it. Please help.