No backlight either in manual/auto setting

I recently bough a brand new Edge 1040.

My unit doesn't turn on the screen backlight under any settings (Settings -> System -> Screen):

  • In "Auto" mode nothing happens, even if the luminosity bar moves.
  • In "Manual" mode, even if I set it to 100%, nothing happens.

I already did the unit reset and problem stays the same.

I always had other Edge units. I also searched here in the forum to similar situations, but didn't find any.

I just want to have sure there is nothing else I can test/try before I return this damaged unit.

"Auto" mode:

"Manual" mode at 100%: