It has to mainboard combine
One is receiver and one is 3in1 controller
If just burn the ESC is easy to repair ,just replace new IRF-7403 MOS-FET IC is OK
Receiver is hard to burn out coz It accept 3.6V to 12V directly
Coz Receiver need power supply fm 3in1 controller , so if the BEC IC burn then all electronic out of power .
Its not only your case , Its common in ESKY 4in1 esp in LAMA