I received a Q6FN recently, and it was okay, until I started watching Ozark...
Unfortunately, this flash blinks between light and dark in dark scenes (subtitles ON-OFF), ruining any experience of these contents.
I find a "fix" for my Netflix problem by changing the white subtitle to half transparent. After that change the subtitle was more grey and did not effect the dimming. Now I'm happy again 😀
Had this exact issue with a brand new 65" NU8000 about 3 weeks ago. Returned it a few days later. However, googling the issue found many Sony owners having the same problem. Think it might just be down to the edge-lit panel.
Funny that so many mention "Haunting of Hill House" on Netflix, cause that's when I first noticed the issue also. First few minutes of episode 1 were borderline unwatchable, thanks to the brightness "bloom" with the appearance of subtitles.
Played around with the settings for an hour or so and the only thing that slightly helped was turning on Ambient Light Sensor. If I turned down the brightness or backlight even more as well, sure...the issue was improved but the screen was so dark as to hinder the whole viewing experience. As people in the Sony forum suggested, I tried changing the subtitle color to yellow with a black border and it didn't help.
Not sure if this subtitle issue is only with streaming apps like Netflix or if it infects Blu-Ray/Directv watching also.
Not sure what my next TV is gonna be and whether a FALD (full-array) like the 6-series TCL might be an improvement over edge-lit for this issue. But it's a shame, because the NU8000 had a beautiful picture and it was a delight for gaming also.
Same problem here with a brandnew 55Q9FN bought in Germany.
Even with an expensive full array panel the TV shows this very annoying behavior. Not only Netflix but also Prime content creates the same error - even when watching non-hdr series (Marvelous Mrs. Maisel for example).
Strangely a short test with the Blade Runner 2049 UHD (4k HDR) played over my Xbox One X worked MUCH better.
I'm not sure If i'll return the tv or should wait for a fix.
Started a thread in the german Samsung forum adressing this issue - hope that more people make noise...
Any comment from Samsung would be very helpful!
A samsung rep came to my house, to see these luminance fluctuations which are made worse with sub-titles, which was nice service. We started with a factory reset, and watching some dark scenes, and wow did it look terrible. He agreed. He adjusted settings and made it better, but its still there, and noticeable to me.
He explained that ultimately, FALD (full array local dimming) with sub-title text on dark backgrounds, will always create bloom, and can only be improved upon with the addition of more dimming zones. He mentioned the Q9FN has 10x the zones, so it can be more localized blooming, but it'll still happen. I can understand that, but whats not acceptable to me is that this TVs local dimming algorithm is working in such a way to create luminance fluctuations.
Due to this issue, and the very poor viewing angle, I'm returning it tomorrow, and am going to try the Sony x900F, I'll even get $1000CAD back, since the x900F is less expensive!
I wish OLED didn't burn in with video game HUDs..
Which are the settings that made it look better pls share, Ty!