Chosen Solution
My Roku screaming stick works fine on my other Phillips brand TV no problem , but the TV in question blinks continuously while screaming with the very same Roku screaming stick . On the TV in question there’s 3 HDMI ports , and they all yield the same problem . The TV’S are both 2012 models . My internet connections are all secure , running at 60-71mbps . My other television performs masterfully , using the exact same screaming stick , the very same one ( not just meaning the brand ) .
It’s sounds like there’s an issue with the mainboard. Could be the hdmi chip or a processor issue. Try something other than the roku stick like and dvd player with hdmi output. I have 1 I’m working on same issue when chromecast is plugged in but fine with sky hd box