Adjust Y70 screen backlight brightness

[livid nimbus]

Is there a way to adjust screen backlight brightness on the Y70 Touch 4K, preferebly without Nexus?
Right now, the on-screen brightness control doesn't touch the backlight like it used to a year or two ago. It leaves the display at full brightness all the time and only dims the colors which looks horrendous.

[real breach]

Sorry for the late reply, could you show an example of what you mean by dimming the colors?

the brightness control should affect your backlight