Hey recluse,
Was the one that turned on and off hooked up to a cable box? I don't mean to state the obvious if everyone knows this, but cable boxes have to be rebooted from time to time or else they will exhibit this same behavior, making it appear the TV isn't working. I've had a Panasonic for 13 years, an LG for 9, and a Vizio for 6 (all LCD or LED) and they're all going strong.
Was the one that turned on and off hooked up to a cable box? I don't mean to state the obvious if everyone knows this, but cable boxes have to be rebooted from time to time or else they will exhibit this same behavior, making it appear the TV isn't working. I've had a Panasonic for 13 years, an LG for 9, and a Vizio for 6 (all LCD or LED) and they're all going strong.