2020 QLED T models (Q80T, Q90T, Q800T, Q900T) HDR game mode brightness / local dimming bug

[Rauttis]

I bought a Q80T a couple of days ago and have noticed a really annoying issue when using the tv with the combination of HDR and game mode.

I'm fairly certain this is a software bug in the TV since I can reproduce this issue with 100% accuracy, and it happens on the dot at the same moment every time. It's basically on a timer.

Basically when the game is displaying a HDR signal and game mode is enabled, exactly after 6 minutes the brightness of the TV suddenly drops by around 20 (50 -> 30). The value of brightness setting doesn't actually change however. Messing with the brightness setting does not restore the brightness to it's original state, but changing the local dimming setting from standard to low and then back to standard does. Switching game mode off and then back on also fixes the issue, but then it happens again EXACTLY after 6 minutes (I've timed this with a stopwatch).

Has anyone else experienced this issue? Or can someone maybe test this on their TV to see if you can reproduce it?

Exact repro steps on how I can reproduce this 100% of the time on the PS4 Pro:

1. Set brightness to max (50)
2. Set local dimming to standard (bug happens on high as well)
3. Enable game mode
4. Turn off game motion plus
5. Turn off intelligent mode and all the brightness related settings in eco settings, as these can influence the brightness level of the tv.
6. Launch a game that runs in HDR
7. Start your stopwatch
8. Do whatever you want in the game or you can also go back to PS4 menus, find a bright scene where you can notice a brightness drop easily
9. When the stopwatch hits 6 minutes, you should see the TVs brightness suddenly drop by a large amount. By eye the brightness drop seems about equal to dropping the brightness from 50 -> 30 by hand.
10. Go to picture settings and set local dimming to low (brightness does not change)
11. Set local dimming back to standard (brightness suddenly jumps to the original level. Brightness can be restored by switching input away and back as well, or by disabling and re-enabling game mode)
12. And again after EXACTLY 6 minutes the bug again repeats and the brightness drops down again

Some other notes: The PS4 has a screensaver that basically dims the screen if it is idle for a while. This is not the cause of this, this happens even when the console is in active use and the brightness can be restored temporarily by changing the local dimming setting like described above. I have not managed to reproduce this issue with game mode off, so it seems to be related to game mode.

Software version: 1304

[DUSKTILLDAWN]

Yes horizontal lines scrolling from bottom to top of screen

[TG41]

Does this happen on us models and the q80t

[DUSKTILLDAWN]

Yes

[Snir4]

I have qe q95t and I can see in any mode scrolling line in broadcasts from the streamer (apple tv 4k) also in the YouTube and Netflix app from the screen itself, as if you can actually see the backlight of the TV, it happens that the screen shows a solid color or on most screen and the image moves fast, This is the most prominent Danny plays on ps4 pro in FIFA or I play call of duty and see a lot of sky and I move fast. Many claimed that it was dse I do not think it is dse I have already replaced three TVs and in all of them it was in a more noticeable part and in a noticeable part but without a doubt everyone had this phenomenon. Really really disappointing from such an expensive screen. I think all European models have it but not everyone manages to see it, you have to know what to look for to see and know that it is there to be able to see !. Whoever does not see, I am very jealous of him

[DUSKTILLDAWN]

Thanks for your comments what your seeing is different issue it's vertical banding ,where screen scrolls quickly in sport or programmes with solid colour ,like patchy Ares of screen in lines ,this issue ok here is in game mode with console connected GMP turned off you get horizontal scrolling lines going up not across like vertical banding .

[ad1994]

I think people are seeing these vertical scrolling lines, but it's only on game console menus. I have the scrolling lines, but not in-game. This isn't a new phenomenon either, because it's in Version 1304. 

[Toejo78]

It's in games to you just need a grey background to see it. Play the new cod open beta it's all over the end of round screen.

[Keitoki]

Hahaha @AV2O20 likes his owne posts with multiples accounts, wtf you are mentally disturbed oO

it's for more credibility or what ?

[QuantumP]

Why are you a undeveloped child?

[Keitoki]

Clown 🤣