Chosen Solution

Good day pls I was trying to connect my iPhone to an Aux and all of a sudden It went off and started overheating for about 2 hours since then it has refused to come on again

Josh bosh, over heating= short circuit. Sounds like something went wrong with your aux connection. Only thing you can do for now is to disassemble your phone using these guides. Then take a look for any obvious damage (i.e. broken, missing or otherwise damaged looking components) You also want to try and narrow down the area that gets hot.