I have the same problem with a 49NU8000. Just wow. Can't use subtitles, and it's also noticeable while gaming.
How could anyone miss this? I'll return it on Monday, as I have no intention of waiting for a firmware that might not come.
What a joke.
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..
Semi transparent subtitles on Netflix help a bit with HDR content, but it does not fix the problem. I've used that trick and the fluctuating brightness still bothers me. And you have to switch back to normal subtitles with SDR content or the subtitles are almost invisible and the Netflix app on TV doesn't apply the change right away. It's cumbersome. And this only works with Netflix. So while a good tip to make the situation a bit better, it's NOT a solution. A premium TV should work properly without tinkering. I think only Samsung can provide a solution in a form of a fixed firmware.
I just got a Samsung Nu8000 and I have the same problem with the subtitles on Netflix, it's very noticeable and really frustrating. I changed all the setting for an hour, but the problem is still there. If Samsung is not gonna fix the problem, I'm gonna return the TV.
I can't watch something with the brightness changing every 2 seconds, what kind of bologna is that? I hope we will get an answer soon.
I just bought two q8 (55" & 75") because of all the great reviews. Set up the 55" and found this problem with the subtitles immediately. As soon as I went to the internet I found it is a common problem. I guess I will return them both as nothing on this thread indicates that there is a solution or one coming. Such a hassle and something that should be in reviews and in Samsung's own literature. This would have been a deal killer for sure, now everyone is inconvenienced having to return it.
I got my Q9FN this weekend and like you guys saw this unbeliveble annoying issue. How on earth can a premium TV like this have this sort of problem?
Samsung, I really really hope that you take this problem seriously and fix it within the next firmware update.