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Original topic:

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

(Topic created on: 07-12-2020 01:47 PM)
Rauttis
Explorer
Options
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
BogaMoge
Pathfinder
Options
TV

Interesting... did he tell you the parts he's bringing?

My set is coming back today after being through repair service. But the customer service is unable to provide me with a precise repair report that specify clearly what has been done, so I was (and still am) very doubtful that my tv will come back "fixed".

But what you say about "bringing the parts" tends to make me think techs are now aware of the problem (even if Samsung doesn't acknowledge the problem officially) and that a simple part swap can solve it. Fingers crossed...

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lmpcardoso
Navigator
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TV

Hello all,

This morning I was playing a bit and made 2 videos showing the purple/green ghosting on my 55 Q80T.

Its about time to samsung fix this issues...

I'm trying to have a replacement with samsung support but they don' t have a conclusion yet.

You can see the videos here:

https://youtu.be/x0xVdVB2UD0

https://youtu.be/E4EUcDV5x2A

We need to keep showing samsung evidences of the problem, this is not our imagination, they are selling top products with faults, and they must fix this.

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Charlyiii
Student
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TV

I was talk with Samsung today, and the said me that don't have working in any update firmware or fix...  😞

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Toejo78
Navigator
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TV

They are too busy getting the 2021 range ready to flog.

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Charlyiii
Student
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TV

I think that i Will return TV...

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redlum77
Journeyman
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TV

I just return my QE65Q90T because too much DSE/Banding. The TV was great exept that but I can't bare to see those artefacts while playing a game (the problem is barely visible in movies/series so I hesitated a lot before sending it back).
I'll wait another year to try another TV cause all models seems to have this issue at a certain level.

SidL
Pathfinder
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TV

How long ago did you buy the TV to return it?

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redlum77
Journeyman
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TV

10 days

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jayh89
Helping Hand
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TV

Update 1460 out now in EU/UK/US. I got it directly via TV (not USB). No idea what it changes yet.

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Charlyiii
Student
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TV

Ohh, you can try Game Mode and VRR blacks??

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