When using the Samsung QN85B or QN90B Neo QLED 4K Smart Television Sets, you may experience dimming and/or flickering problems.
To see how you can fix these issues for the 55-inch, 65-inch, 75-inch and 85-inch screen sizes of both models, you can take a look at this troubleshooting article at Seeking Tech.
In order to fix the dimming and flickering problems with your Samsung QN85B or QN90B, you can try doing the following:
1. The first step you can take is to try turning off your QN85B or QN90B and then turn it back on again.
2. You can also try unplugging your TV set from the power outlet, wait a few minutes, and then re-plug it back into the power outlet.
3. You should make sure that the HDMI and other cables aren’t damaged and are properly connected to your Samsung television set.
4. If your screen is still dimming or flickering, then you can try to disable Brightness Optimization by first pressing the home button on your remote controller.
You then need to select Menu > Settings > All Settings > Power and Energy Saving > Brightness Optimization.
Afterwards, make sure that the Brightness Optimization feature is turned off.
2. You can also try disabling Brightness Reduction by pressing the home button on the TV remote and then going to Menu > Settings > All Settings > Power and Energy Saving > Brightness Reduction.
Finally, make sure that the Brightness Reduction setting is disabled.
3. You should disable Motion Lighting as well.
In order to do so, press the home button on the remote and then select Menu > Settings > All Settings > Power and Energy Saving > Motion Lighting.
Next, you need to make sure that Motion Lighting has been turned off.
4. Moreover, you can also try turning off Contrast Enhancer by pressing the home button on the remote and then selecting Menu > Settings > All Settings > Picture > Expert Settings > Contrast Enhancer.
You then need to make sure that you have Contrast Enhancer disabled.
5. You can also try running the Picture Test to see if the dimming and/or flickering is related to your Samsung Neo QLED TV or with the connected device.
In order to run a test, press the home button on the remote and then go to Menu > Settings > Support > Device Care > Self Diagnosis > Picture Test.
If the screen appears to be operating normally, then the dimming or flickering may be related to the input device you have connected to your television set.
In this case, you can either connect a different device or refer to the user manual of the troublesome device to see how you can get rid of the dimming and/or flickering.
6. If your television set is still flickering and/or dimming after trying all of the aforementioned solutions, then we recommend contacting Samsung for additional support.
The cause for these screen issues may end up being hardware related, which means that your TV may need to be repaired or replaced.