how to turn on the keyboard backlight? need help

[tt1821]

hi..i just bought a ASUS X550VX..there is no backlight for my keyboard...please I need help for this

 

[Slow Pri]

Try pressing the FN+F3 or FN+F4 key and see if that does anything.

 

[tt1821]

tried already..still the same

 

[Slow Pri]

Faulty keyboard?