Use macOS Recovery to reinstall the system without erasing user data. A corrupted preference file or a conflict within the macOS kernel can disrupt the communication between the keyboard and the logic board.
Troubleshooting MacBook Keyboard Backlight Not Responding
Similarly, the "Turn display off after" slider, if set to a minimal timeframe, can cause the screen and keyboard to deactivate rapidly. Boot into Safe Mode to determine if third-party software is causing the conflict.
Manual Control and Function Key Interactions User-initiated commands play a significant role in the visibility of the keyboard. Software Updates and System Management Operating system glitches are a common culprit behind peripheral malfunctions.
Troubleshooting MacBook Keyboard Backlight Not Responding
Ensure "Enable Power Nap" is disabled if it conflicts with background processes. Furthermore, the backlight is not designed to be permanently on; it activates only when keys are pressed or when specific conditions are met, which can lead to confusion if one is unaware of the operational logic.
More About Why does my macbook keyboard not light up
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