A:Answer Same thing happened to me. 55R615 - tried unplugging, resetting couple times as suggested by TCL but it didn’t turn on, ended up buying a new Power board per TCL’s recommendation, replaced it myself, which worked for 2 days and it shut down again, unexpectedly, and now it’s not turning on. It’s a 1.5year old purchase, out of warranty, please tell me what worked for you.