Guys thanks for keeping this Thread active. Did another picture reset and now using Standard mode instead of Movie mode for last 3 days. Have not seen a Flash with my TiVo Bolt but had a big flash while watching Blu ray movie with ps3 still.
Im not 100% sure, but i may have finally figured out the cause and solution to this issue. Everyone try turning the sharpness off by taking it all the way down to 0. I tried this because i was having other recurring issues beside the flash on certain 4k discs. On one movie the black bars (top and bottom of screen) would flicker. On another movie (with heavy film grain), anything that was dark, black or near black would flicker. I have never turned the sharpness completely off before. always had it at 20 or slightly higher. Once i turned it off, all of these issues went away, and i havent seen a screen flash since. I think its possible that all of my other issues and the flash could be related to the sharpening level. If you think about it, if you have the sharpness turned up, the tv is basically trying to sharpen an already 4k image. I may still yet see a flash, but i have a good feeling about this one. I will update soon, but everyone please try this.
I have always had the Sharpness set to 0 and still had the White or other colors flashes. I just watched a Blu ray movie with ps3 and saw one Large flash. Thought maybe new 1260 firmware was the fix. Can someone tell me when they do the Picture test with kids on the beach and select Yes do you see Grey screen?
OH no. I guess 0 sharpness just fixed my other issues then. I will assume a flash is coming soon. I'm sure I was just getting my hopes up cuz this flash has become one of most annoying things in my recent memory. And yes I get the grey screen on the picture test after the 1st picture
Thanks for the grey screen info now I know it's just not my tv. Others out there with 2017 QLED models please chime in and let us know if you are still seeing a "White Flash" using any device (Tivo, Cable boxes, PS3 or PS4 etc).