Why is my tablet not charging

@guy76224 we will need to know what you have already tried and what you have already checked. We also need to know if this just all of a sudden happened or did anything happen to your tablet before. Furthermore we need to know if this is a SE 8.7 or SE11 tablet etc. The more details you give the more of a direct answer you could receive.

First check your charger. Make sure it has proper output. Then check your charging cable. Check to make sure connectors are not bend etc. After that, check the charging port. Clean it of any debris etc, use a few puffs of air to clean it out. If none of this works, get a USB ammeter and see if your tablet draws any amperage from the charger. If it does not it is possible that this is a charging port issue or a bad battery.