Look it up in the Manual:
https://www.lg.com/us/support-product/lg-52LD550
SOURCE: white horizontal line down middle of TV screen
caution whenever you see horizontal line please reduce brightness of your tv for safety of crt. your problem in vertical section only mostly due to loose contact in connector,print or loose components.
SOURCE: TV: bright line across black screen for several hours.
vertical problem need to check for bad solder joints on vertical ic would be helpfull if we had the model number o f yur set. also could be bad capasistors in vertical section.
SOURCE: I have a horizontal line going across the picture of my tv.
The panel is bad and will need to be replaced.
SOURCE: pink color horizontal lines comes on and off
That issue is with one or more of the board that drive the plasma screen. If you have a warranty, you will want to call LG for a free repair.
Sorry, but to trouble shoot that issue would require some TV tools and knowledge of electronics. There are several boards involved with processing the picture image to the plasma screen.
I hope this information has helped you.
Good Luck.
SOURCE: I have a Sony KDLW3000, the picture has colored vertical lines on the whole screen,
The Tcon board is usually at fault with that symptom. You can get a replacement Tcon from www.tvrepairworld.com
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