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

(Topic created on: 10-05-2020 11:59 PM)
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Rauttis
Explorer
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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

2,028 REPLIES 2,028
DRACON1C
Explorer
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Lol.

Actually due to the latest updates. There was no problem before. 

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LCDeez
Navigator
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Not messing with OLED, no thanks. They better patch it. 

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jayh89
Helping Hand
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It's been 2 weeks since they were alerted to this so I think we need to wait a bit longer for the fix. I'm sure @AntS  will keep us/me posted. 

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SidL
Pathfinder
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I'm from Brazil, and I'm suffering from this same irritating problem 😒

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Suriya
Voyager
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One person from SAMSUNG technical team yesterday said they didn't know about this problem and there is nothing like this. They must need a video proof of this to accept
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jayh89
Helping Hand
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A mod on here called @AntS has assured me that he has spoken to the TV guys and that they are investigating. Just need to be patient I guess.

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LCDeez
Navigator
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A tier one support member may not know this has been discussed with higher ups. 

ktroopa
First Poster
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Just brought home my Q90T and noticed this dimming issue after gaming on it for one day. Hopefully this gets fixed soon !!

Suriya
Voyager
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Update: Today i have noticed that local dimming bug (hdr:game mode-on, game motion plus-off) happens in 6min FIRST TIME ONLY after temporarly fixing it by switching LD from high to low>high second time didn't happen again in exact 6min. second time dimming happening randomly. "Pls anyone check with timer/stopwatch and let me know".

 

Also in sdr game mode sometimes it happens sometimes not.

 

Tv is very hot within 10min (default game-mode settings) if you show your back side of forehand nearly half feet to the screen you can feel it.

My tv is 55Q95T

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jayh89
Helping Hand
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Not able to test the first bit but heat wise, I'd expect the TV to give off a lot of heat as it's a large computer basically! I wouldn't worry about that. 

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