The red standby light is annoying and too bright in the dark. I tried "samsung service menu" on my 4K smart TV. Tv must turn off. Then hit buttons: Info, Menu, Mute, Power.
Tv shows the service menu.
Then choose: Option/ Engineer Option/ Standby led on/off
I set to off but nothing changed...
must be possible. I've the opposite problem on my brand new qe55q80 the screen goes off but no red light though i'm sure it was on prior to setup.
Where as on my bedroom older samsung tv it's on when the tv is off