I've had my Q90T for just over a month and started having some odd dimming and chromatic abberation issues. Three different symptoms and I don't know if it's recent firmware related (I'm on 1115) or hardware. This didn't happen in my first few weeks using the TV. I've figured out workarounds for some of these. First issue: While watching any content, my screen would instantly dim (whole sceen dimmer). I have all Intelligent Mode and Eco Mode settings turned off so it shouldn't have anything to do with Ambient Light detection. I have Game Mode on, but Dynamic Black Equalizer set to zero and Game Motion Plus turned off. I have Local Dimming Set to High. What I did notice is that when the screen suddenly dims, it's the same look as if I had set Local Dimming to Low. Sure enough, if I switch to Low, there is no change. But when I switch back to High or Standard, my screen brightens back up to what it was before. But after a few minutes... it would dim again unless I toggled the Local Dimming settings again. Now for this issue, I did a Factory Reset... and it doesn't seem to be happening anymore (even now that I'm back on latest firmware). So I'm wondering if the latest firmware broke things when applied over previous firmware updates. Edit: Probably a good idea to specify what TV model, peripheral, application, type of content (resolution, frame rate, HDR) that you have the issue with if you can. Before I did my reset and firmware upgrade, I was getting the dimming issue on multiple devices. Watching 1080p content on Netflix via Xbox One would have the issue, sometimes randomly with my PC, and also while playing on PS4 (specifically playing Last of Us 2). After the reset and firmware update, I actually have only noticed it now on PS4 (again playing Last of Us 2) and sometimes while playing games on PC. A friend of mine with the same TV never had the issue, except when playing Last of Us 2 on PS4. Second Issue: (edit: I haven't had this again since toggling game mode off and on): I'm getting what seems to be Local Dimming artifacts (checkerboarding). It doesn't matter whether my Local Dimming setting is Low, Standard, or High. When scene content suddenly changes it is very apparent. I get a grid of darkened squares all over my screen that quickly fade to the correct color (it's like the dimming processing is delayed). It's like a 15x8 grid of squares. This one is very bad and it doesn't take much to make the checkerboarding appear (I can move my camera around quickly while playing a game and I'll see it). Interesting thing I ended up trying out was to turn Game Mode off... and it stopped happening. Interestingly, I turned Game Mode back on, and it still is not happening again (don't know if that will last). Didn't matter what input source I had (this could happen on on the Samsung blue screen while the input isn't found). Third Problem (edit: haven't had this since the firmware update to 1301): While playing on PS4 I was noticing a lot of chromatic abberation while moving my camera around in a game. I turned Game Mode off and the chromatic abberation goes away. So seems like maybe some issues with Game Mode?
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