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Original topic:

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

(Topic created on: 30-11-2020 07:45 PM)
Rauttis
Explorer
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TV

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

1,968 REPLIES 1,968
osse-d
Apprentice
Options
TV

I have the same Bug with my new Samsung Q82T 65". Wheter in gamer mode, on amazon or Netflix. After 6 Minutes the image will be darker.

 

greetings vom Germany

 
 
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Iskandarkebab
Pioneer
Options
TV

Its normal to have brightness and contrast at max. when using HDR, this way, TV can use all its range of colors. If you reduce brightness and contrast in HDR modes you are limiting the tvs capabilities.

jexx
Journeyman
Options
TV

This is very good information. Good point. Thank you. So, the only issues I have are game mode looking absolutely terrible, and the auto-dimming. 

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Charlyiii
Student
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TV

I have the same issue. 6 minutes and bright down, but not only en Game Mode, playing with Film Mode top.

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lmpcardoso
Navigator
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TV

Besides the dimming bug, does anyone here have the purple ghosting bug? I don't have the dimming bug, I have ghosting issues. Today playing The Last of Us 2 I saw purple ghosting with GMP ON, if I turn of GMP OFF the purple ghosting disappears but I have terrible judder.

Thank you guys! 

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jayh89
Helping Hand
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TV

I get some purple ghosting with GMP OFF. Miles Morales, grey sky, if I pan left and right I get purple ghosting. I don’t notice it in general play but it is there. 

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jayh89
Helping Hand
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TV

Look at the sky here and you can sort of see it https://youtu.be/3WFBEhHg_5E

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lmpcardoso
Navigator
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TV

Yes, it's not much but it's there. 

On my Q80T it's very distracting can't play with GMP ON.. Can't play either with GMP OFF, now what? Game mode sucks really bad, but outside game mode I can notice the response time increases a lot... 

Charlyiii
Student
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TV

I was testing, and i have the bright down when i am playing with Game Mode OFF. When I play with Game Mode ON, the brightness its ok after 6 minutes...what is the problem?

(I don't like play in Game Mode because the black pattern is very bad and i have clouding, but with Game Mode OFF the blacks are perfect. Now i have the problem of bright down...lol). A fix please.

 

Edit: I was try yo change 120 Hz to 60 Hz in Series X and looks better.

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portuguese83
Explorer
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TV

just got off the phone with technician thats coming to my house, he has already ordered parts without even seeing the tv 65"q90t.. im experencing bad purple ghosting

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