I just completed setup for a new UBPX800 player, attached to Sony Bravia XBR-55X850A. I replaced a Sony standard Blu-Ray player which had a very bright picture thru the TV. I believe the TV does NOT have HDR. As soon as I played the first Ultra 4K Blu-Ray disk, I realized the picture was too dark. I re-read the manual, and tried several option changes, including changing the HDR from AUTO to OFF, but no difference. I created a custom screen with brightness at maximum; that made the background NOT BLACK but did not seem to brighten the picture details. So, I played a regular Blu-Ray disk and had the same issue. When the scene goes to an inside location, it is so dark I can't see the details. Outside scenes look as if it about to rain, when it's obvious the sun is shining. NOTE: This issue is not as bad if I stream 4K from YouTube ... ?
I can go to any other device attached to the TV, e.g., ATT DirecTV, and the picture is brilliant (vivid). I replaced the older player, and the same Blu-Ray disk I tested on the UBPX800 was brilliant. I am using a new 4K certified HDMI cable for both tests.
Given that the TV doesn't have HDR, is there a combination of settings that will result in my getting the brilliant screen I desire, or do I need to reset the player and take it back to BestBuy?