I have turned off every damn eco setting on this damn television and it's still dimming.
What picture mode are you using? (Movie, Game, etc.) Some are worse than others with the backlight "pulsing".
Is this in HDR or SDR mode?
What is your Smart LED setting? If you have it turned off the entire screen will dim instead of just individual sections.
Am I the only one that finds any game in HDR to look washed out?
Contract 95
Brightness 50
Dynamic Contrast Low
Every set is different but to me that brightness is pretty high, which would cause your blacks to look like a really dark gray and less "inky" which will ruin contrast. Here are my HDR game mode settings for comparison:
HDR Game Mode
Backlight - 20
Brightness - 43
Contrast - 100
Sharpness - 15
Color - 51
Tint G50/R50
Digital Clean View - Off
Smart LED - High
Film Mode - Off
HDMI Black Level - Low (Not used for HDR)
Dynamic Contrast - Low (I consider DC Low a necessary evil for most HDR games. Some don't need it but a lot of them just look too dim without it. Any higher than Low is crushing detail)
Color Tone - Warm 2
Gamma - 0
White Balance - 2-Point - Defaults (All 0s)
Color Space - Auto