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No liquid, no history. Broken screen, changed it and found that it doesnt work ( i am not sure if before display replacement it was working, but mu gues it wasnot). Also tried another screen with same result, tried PRAM and SMC restes.
As i told in my first post, i am sure that keys are working because with Fn it is making clicking sound
Tried revive through Apple Configurator, but no changes.
P.S. Flashed it second time and now i have backlight on keyboard but only when i am on user passwords screen. Once i put password and it loads the system machine is back exactly in first post situation.
I dont even know that there are this two qualities. Anyway cuatomer take it away without keyboard backlight.
PS. Even if ALS sensor is missing keyboard backlight must light when press the button. I testes it with no display on other air and keyboard is lighting