Hello there sorry for the double post but I'm concerned about the same problem.
I just bought a 55q9fn and I have the same issues with subtitles. The whole panel brightness goes up as soon as the subtitles appear with hdr content. Any solutions? Thanks
So far I have not managed to find out any solution to this. Also Samsung support confirmed to me yesterday in a call that this would be a known issue and a "feature". They mentioned that some users might be more sensitive in seeing the effect that the appearing subtitles cause with HDR material. I said straight away that it is nothing to do with being sensitive or not and that they should not say something like that to a customer in the first place. To me that is kind of rude and not taking the complaint seriously. They are clearly trying to get a away with it without taking a serious action to correct the issue. I would encourage you also to inform Samsung about this asap so the possibility of fixing this with a future software update would increase.
Just to update you I also tried resetting tv to factory settings and also reset smart hub but this did not fix anything. The only things that provided any help was to change subtitles in Netflix to yellow colour and change the size to minimum. Still the effect can be seen but not as badly as before.
Look at my previous post, there is a some solution for this problem.
If you turn the bacliight down with HDR then you will lose some of the dynamic range which is what HDR is all about. It sounds to me like a faulty panel
Hi there, I have the 2018 q7 qled 65inch and have exactly the same issue. Everything works perfectly for all my HDMI sources but as soon as I use any apps, like Netflix, this problem occurs. All my TV settings change complete if I try and play HDR content, the screen keeps auto adjusting brightness (very dim) , colours change and I have no fix. If I turn HDR on in settings it's just OK for the HDR shows but everytime the sub titles pop up the screen is still auto adjusting brightness and it brightens up the whole screen. Now the all the HD shows are over saturated and way too bright and I have to turn HDR off again. It's obviously a common problem and not caused by a faulty screen.
I think the reason most reviews don't cover this problem is because it's only something you see within apps, not the HDMI sources. I don't think many, if any, reviews are doing checks on how installed apps display picture quality
I received my 65" 2019 Q9FN on Friday. Same issue as you with HDR and subtitles on Netflix.
I contacted the local Samsung support in Norway today, and got a reply within 21 minutes. They told me that this is a problem with the Netflix app, and that a fix is in the making. I'm now waiting for an ETA.
They said that this issue should not be apparent when playing back HDR content from other sources than Netflix.
I downloaded a sample of Avengers Infinity War 2160p HDR x265 with subtitles and played it back in the built-in app in the TV. The source is Kodi's DLNA, so all the processing happens in the TV.
As far as I could see, there were no issues at all, so I guess it is true that this only happens with Netflix.
Anyway, I will do some more scrutiny later tonight when it's properly dark.
Thank you very much for the information! During these couple of weeks that I have been watching content from different sources it seems that you are right. Also with PS4 games having HDR enabled does not cause the brightness to change with subtitles enabled.
One things I however noticed this week was that the problem is not just when you are watching HDR content with built-in apps (Netflix, Amazon Prime..) and subtitles enabled but also the same problem is there with ULTRA HD content. I tried this with Netflix by watching "Dark" which is not HDR but ULTRA HD only.
Oki, so UHD with no HDR has problems with brightness levels if subtitles are enabled?
And you say that the brightness problem is not restricted to Netflix, but also Amazon?