Keyboard Backlight not working

First verify that the exact ASUS ExpertBook model includes a backlit keyboard, because some ExpertBook configurations do not have the required backlight hardware.

1. Identify the full model number

1. Press Windows key + R.
2. Type msinfo32 and press Enter.
3. In System Information, note the value beside System Model. This should include more detail than “ExpertBook,” such as a B1, B3, B5, or B9 series and its suffix.
4. Look up that exact model’s User Manual or Tech Specs in the ASUS Support Center.

ASUS states that keyboard-backlight support varies by model. If the manual and keyboard layout show no backlight control, the laptop may not contain a backlit keyboard, so Windows settings or drivers cannot enable one.^1^

2. Try the ASUS ExpertBook backlight controls

Look across the top function-key row for a key showing a keyboard with light rays—commonly F7 on ExpertBooks.

Try these in order:

1. Press F7 several times to cycle through the brightness levels.
2. If that does nothing, press Fn + F7 several times.
3. Press Fn + Esc once to change Function-key lock mode, and then repeat F7 and Fn + F7.
4. If there is no backlight symbol on F7, check F3/F4 and try the key by itself and with Fn.

ASUS documents F7 for most notebooks, F3/F4 on some models, and different controls on certain gaming models.^1^

3. If the exact model supports backlighting but the keys do nothing

Install available ASUS/Windows driver updates:

1. Open Settings → Windows Update.
2. Select Check for updates.
3. Open Advanced options → Optional updates and install any relevant ASUS, keyboard, firmware, or system-device updates.
4. Restart the laptop and test the ASUS hotkey again.

Microsoft also supports updating a device through Device Manager → device name → Driver → Update Driver.^2^

If the model specification explicitly lists a backlit keyboard and it has never illuminated—even during startup—contact ASUS support for a hardware assessment. Provide the complete model number and serial number, but do not post the serial number publicly.

References

1. [Notebook] How to enable Backlit Keyboard | Official Support - ASUS
2. Mouse and keyboard problems in Windows | Microsoft Support