What is my next step to fixing this issue?

[PJerkins1013]

47 LG LED black screen has sound picture is very dim shine flashlight to see its still on, when looking through vents on the back there is no lights at all, so would it be the LED driver?

 

[jsmithepa]

That would be the first thing I'd blame.

Next item though could be PSU. If you are able to obtain schematic, can test for presence of all DC voltage.

 

[ssddx]

symptoms of a bad backlight are as described.. i would start there.