lg 65inch model 65uh6030-uc so I got backlight when turn on no picture

I have a lg 65inch model 65uh6030-uc so I got backlight when turn on no picture o took back off and troubleshoot it and did the tcom test by taking one ribbon out at a time and seeing if I have half a picture when I took the right side off sale result no picture but backlights on when I took the left ribbon out I have no backlights at all what does this mean?