Plugged to AC bricked the phone

so , i have a G6 i was using a samsung aftermarket fast charger QC3.0 , just when plugged it in the phone vibrated couple times (like of plugging and unplugging the cable) then turned off completely , and won’t turn on tried hard reset .. etc

when i plugged it to the car 12v charger the light of the 12v charger turns off when i just plug the chable in the phone , and turns back on when i take it of the phone (like the phone stopping the electricity )

so i want to know whats faulty , is it the charging port , or the whole Motherboard ,

PS: the electricty in that room is not good at all , after the incident i knew that i burned 2 phones charging port !

edit: opened the motherboard and found this i think its blown