The only sure way to find out what type of backlight you have is to remove the screen bezel (plastic frame) and check it visually.
See pictures below and our Installation manuals for help.
  0001

002

  003

 Check if your inverter has one or two backlight connectors. One = single backlight, two = dual backlight. 

Single connector

  Single connector

  Dual backlight inverter type 1

Dual backlight inverter type 1 

Dual backlight inverter type 2

 LED screen doesn't have high voltage cable going from the screen bulb to the inverter and if no such cable can be found, you can assume your screen is LED. Please, see the picture below. 

  LED backlight screen

 LED backlight screen