samsung note 5 dead /ic problem

My phone is turned off I don't know how I make a call and then put it into my pocket after 5 minutes my phone turned off and I plugged into original charger but wont turned on so I take it to a person who repair mobiles he checked it and do a hard work on it but my phone wont turned on he said to me that may be it has a power management chip/ic problem but he don't know that which phone has the same one to replace and no one has another piece of dead or broken note 5

If anyone know HOW to repair it kindly let me know ASAP I'm really worried about it.

Or if anyone has a piece of note 5 mother board so kindly send any image of it I want to know that which chip/ic is belong to note 5

Thanks