iPhone 8 logicboard hot and wont turn on

I fell asleep on facetime one night with my phone off the charger, woke up the next morning to it scorching hot. I put it in the freezer to cooldown (yes ik thats dumb of me) and ever since then it hasnt been hot. It just wont turn on. I got a new battery, put the new battery on top of the old one to see if that was the issue and it wasnt, the new battery makes the logicboard turn hot aswell. Any clues on what I should do? I literally havent had this phone for a month yet