Why is my tablet charging light a solid red when it is not plugged in?

I went to plug in the charger while it was updating and it cut off, however the charging indicator light remained on after unplugging the charger. It is heating up the motherboard. I disconnected the battery and reconnected it and it is still on. I’ve attempted the hard reset (holding down the power and volume button) with the battery connected and disconnected. I’ve left the battery disconnected for about 45 minutes and am still having this issue.