Check whether your keyboard has a backlight key or shortcut
Press the keyboard lighting key, often marked with a light icon
Try common shortcuts such as Fn + Space, Fn + F5, Fn + F4, or Fn + F10
Use your laptop’s keyboard settings in the operating system
Open the manufacturer’s keyboard software if installed
Increase the keyboard brightness level if lighting is already on
Make sure the device supports keyboard backlighting
Check the user manual for the exact key combination