You need to get a TV repair person to give you estimates. I also advise discontinuing use of this as the failure can cause other issues if use continues.
I have a LG 37LV570S LED TV, and recently, lines started appearaing all over the screen - there is a video of the problem:
This happens on DVB-C, satellite TV, playing movies from USB, browsing the internet, (happens whatever you do)
What could the problem be ?
Thanks and have a nice day.