Is the problem in power ic? Dead iPhone 7

Hello, I have a normal iPhone 7,

it just turned off while i am using it

I went to the store because I expected the screen problem and he told me that the screen and battery had been changed and the problem was not solved

He told me that it might be a problem with the ic power

I just tried it and when I put the charger , the area marked in the picture is getting overheat Then the Motherboard getting medium heat

Is there anyone who has experienced like this a problem and knows the solution or cause of it?