I experienced this problem a month ago, this electrical noise was very disturbing, I was very confused. and if it is turned off it still sounds but slightly decreases. especially when it arrives dead without being shut down, it makes it difficult for me to reactivate it, sometimes I shake the power cable to make it turn on, sometimes it works but sometimes it takes 1-2 days (shakes the cable power).
please help, if anyone knows or has experienced the same problem?