TV back light won't turn on

[salvadorm23]

My LG 55ga6400 back light won't turn on. I can hear everything but can't see anything. Don't know which board to replace please help?

 

[te100]

could be inverter board can you see a pic if you shine a flashlight on the screen

 

[salvadorm23]

yea i could berly make out a pic and i could still hear the tv on but i turned it on right now and it worked. dont know what board i have to replace there 3 on there

 

[te100]

its usually the little board an the side toward the outer edge there is one sometimes one on each side that controls the backlight

 

[salvadorm23]

yea there is one with the hdmi connections on right side and on the left side one that has 3 connections and one of those connections runs to the power board in the middle of the tv