Chosen Solution
Fitted a new replacement screen to my LG G5, but there is no back light? Put the old cracked screen on and backlight works as normal. Any ideas? Faulty new screen?
@finianmark5 , Mark, If assembled correctly and connections were good, faulty replacement display/screen. Return for exchange/refund. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.