Hi need help is my phone gone for good

Hi my samsung s7 stopped working froze on samsung screen wouldn't reboot wouldn't hard reset wouldn't do anything so I took the drastic action of trying to disconnect the battery yes it wasn't easy but followed the guide etc my battery was damaged on the power point it broke off at the connector so I purchased a new one reinstalled but phone won't boot charge or anything battery definitely works and all removed components work as I took my wife's apart and tried all my bits in and her phone booted each time. So I think something on the motherboard has gone is there any way to recover my data if I replace the motherboard will that work