I am wondering if I've been recently having a variant of this issue. As I have a Samsung LCD HDTV circa 2009, I had chalked it up to being a TV issue, but ...
For 4 days in a row up through yesterday (4/28), the first time I would turn the TV on in the day (which is after an overnight, and having been idle for 10-12 hours), the TV would show garbled video (sometimes no audio, sometimes audio screeching), and then power cycle itself after 10 or so seconds. After it would power cycle itself, video and audio would come up fine. No matter when or how many other times I'd turn the tv off/on later in the day, everything would be fine.
Interesting however, after having the problem 4 days in a row, I did not have the problem today -- i.e., first "turn on" of the day was fine.
Though an older HDTV, it is hooked up to the Xfinity 4k box ... obviously receiving 1080p resolution.
... View more