If the problem emerged after an update, performing a System Restore to a point before the update is a logical troubleshooting step that often resolves software-induced darkness. Many MacBook models utilize the F10 key to toggle the backlight on and off entirely.
Diagnosing a MacBook Keyboard That Has No Backlight At All
This intelligent system relies on a light sensor located near the top of the display bezel. Hardware Diagnostics and Physical Inspection.
If the backlight is set to the lowest level, it may appear off in bright environments, creating the illusion of a complete failure. Use macOS Recovery to reinstall the system without erasing user data.
Diagnosing a MacBook Keyboard That Won't Illuminate At All
When you open your MacBook in a dim room and the keyboard fails to glow, the immediate concern is often a hardware malfunction. If the "Automatically put displays to sleep" slider in Battery preferences is set to a short duration, the system may prioritize power savings over peripheral functionality.
More About Why does my macbook keyboard not light up
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