ATV4K Keeps cranking up TV brightness and contrast when turned on?

Discussion in 'Apple TV and Home Theater' started by UntitledImage, Nov 3, 2017.

  1. UntitledImage macrumors regular

    UntitledImage

    Joined:
    Oct 2, 2015
    Location:
    Tampa, FL
    #1
    I kept wondering why my eyes were hurting.....

    So we got a new ATV4K and it took me a while to catch it. I guess when we hooked it up it reset a bunch of picture settings, I was wondering why the colors looked off and my eye were straining. Finally I got a moment to mess with it and realized that not only were my colors all wrong, but the brightness and contrast were maxed out. SO I fixed it, then it went back. Fixed it again, then it went back. Reset the TV, reset everything.... and I finally tracked it it down. The Apple TV is definitely cranking up my brightness and contrast to max settings when its turned on, and pretty much every time I go to play something. I change it, it changes it back- its not happening on any other input source, its definitely the ATV. Why is this happening and how do I fix it? This is obnoxious, I never keep those setting cranked. I have a Samsung JS8500. Thank you if you have any pointers.
     
  2. UntitledImage thread starter macrumors regular

    UntitledImage

    Joined:
    Oct 2, 2015
    Location:
    Tampa, FL
  3. cynics macrumors G4

    Joined:
    Jan 8, 2012
    #3
    The TV is switching to an HDR profile for that input. The ATV itself isn't capable of changing internal display settings of the TV.

    Describe your setup if you dont mind.. Are you going through a receiver? Does that HDMI input on the TV receive both SDR and HDR signals depending on what you are doing?

    Just a WAG but if you are using an SDR source to calibrate the TV and then switch to the AppleTV (HDR source) your settings will change from the SDR profile to the HDR profile.

    Keep in mind HDR the backlight needs to be a 100% however the brightness and contrast settings shouldn't change once they are set.
     
  4. davidoloan, Nov 4, 2017
    Last edited: Nov 4, 2017

    davidoloan Suspended

    Joined:
    Apr 28, 2009
    #4
    Won't the automatic switching in the forthcoming update solve this for the OP?
    https://forums.macrumors.com/threads/apple-seeds-first-beta-of-tvos-11-2-to-developers.2082162/
     
  5. UntitledImage thread starter macrumors regular

    UntitledImage

    Joined:
    Oct 2, 2015
    Location:
    Tampa, FL
    #5
    No, no receiver. I have a Samsung that has one of those One Connect Mini's, the HDMI goes right from the ATV into that box on its own source setting. I calibrated to all sources but from the cable box. As far as I can tell, I've turned off any HDR or expanded color settings on the ATV source to try to track it down. I have actually watched it happen. I turn the backlight and contrast down to reasonable levels, and as soon as I open an app or something, it literally turns thee settings up. I have turned it down, put the ATV to sleep, and watch the TV menu gain brightness and contrast as soon as I wake the ATV. When I reload the menu, they are back at 100/100.
     
  6. Rudy1 macrumors newbie

    Rudy1

    Joined:
    Aug 6, 2014
    Location:
    Flagler Village, Fort Lauderdale FL, USA
    #6
    This behavior is normal...virtually all higher-end HDR-capable TVs max out the BACKLIGHT and CONTRAST settings when they receive an HDR signal. As you're aware, on the JS8500 picture settings memories can be assigned globally or per input, so if you configured this input correctly the HDR-related changes will not affect any of the other devices you have connected to the OCB.

    On the OCB input where you have the ATV connected, you should (if you haven't already) enable HDMI UHD COLOR and set this input to MOVIE mode; COLOR SPACE should be set to AUTO and SMART LED should be set to HIGH. I would suggest you set AUTO MOTION PLUS to CUSTOM. Start with SHARPNESS at about 50-55, and increase or decrease to your taste. If you are unsure of where to locate these settings, check the TV's onboard manual. And by the way, make sure you're running the JS8500 with the most recent firmware.
     
  7. Shockwave78 macrumors 65816

    Shockwave78

    Joined:
    Jul 10, 2010
    #7
    Basically what is happening is apple is forcing HDR or Dolby Vision 24/7 if you have it enabled. This creates fake HDR/DV content for everything whether its supports the format or not. There is not way around it right now. You either leave it off and it stays off, or you turn it on and it stays on. With every other piece of hardware in the world it detects whether the content is HDR/DV enabled and then turns it on automatically for that content only. Once the content ends it goes back to normal mode.

    What most likely happened here is Apple wants there home screen and all native apps, GUI to the Apple TV to appear very vibrant. For some reason they were not obviously able to figure out how to disable it once you leave the main GUI (and open a app for example) it would turn HDR/DV off. And then back on if you went back to the home screen or started watching HDR/DV content.

    Eh, overall you get used to it once its on though. Fake HDR sucks though in general.
     
  8. priitv8 macrumors 68040

    Joined:
    Jan 13, 2011
    Location:
    Estonia
    #8
    That all does not prevent the display from being customized for your input and memorizing the settings.
    My Sony came out of the box also with brightness set to max in HDR mode. I have dialled it down since, and also changed the gamma. The TV remembers these settings and aTV has no way of resetting them.
     

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7 November 3, 2017