The term "LNVNB161216" is an OEM (Original Equipment Manufacturer) board identifier printed on the printed circuit board (PCB) and embedded in the system BIOS.
Lenovo laptops require specific function key drivers (often called Lenovo FN Driver or Lenovo Keyboard Driver) for the Fn+F-key shortcuts to operate correctly. If your FN keys stop working, download the Lenovo Hotkey Features Integration driver or Lenovo FN and Function Keys driver from the support site for your model. lenovo lnvnb 16 12 16 drivers