2021 QN90A HDMI problem

[kcatarinoqab]

I was messing around in the Service Menu to see if I could get PC Mode to have a backlight flicker of 960hz like VRR does, and didn't really find anything. I enabled Flickerless but that did not stop the ghosting in PC Mode. I turned on HDID by accident but turned it off again. I changed PWM Mid to 50 from 5 to see if that would minimize the dimming, and everything got way too whitewashed so I turned it back to 5. Pretty sure this is all I did.

Unfortunately now the black level of all my HDMI inputs is way too high. The deep blacks are gone but changing Shadow Detail helps a little bit. It does not seem to be the backlight since that still dims. The internal TV apps seem fine. Any ideas? Some kind of HDMI setting I can try?

I am on regular firmware 1903. Is there a way to force it to reinstall? Will the next firmware update possibly fix it?

Thanks in advance for any advice! I will definitely donate if you can help.

[notengo13]

Here on forum you can find an comment from one user that you can reset service menu to it's default changing panel type or something similar I can't remember now. (BEFORE YOU CUT MEASURE TWICE OR READ TWICE )
Also you can try find some videos on YouTube and maybe you are lucky and someone shoot the menu which you are interested in
https://youtu.be/J94NCswEEXw