Facing TV Problems? Ask a TV Technician.
Hello and sorry you're having problems. There's only two things that can cause this bar, and both are hardware failures in the set. In many cases the T-con board (LCD timing controller) is the root cause, since you did mention the info on the bar lags behind, and in others it's the LCD panel itself which is not replaceable. In the field there is no real way to test between the T-con and the panel itself without simply going by the symptoms and then swapping out the T-con. Based on your symptoms, that is what I would do. Are you looking to repair this yourself?
The T-con board (LCD controller) for your set can be purchased at the link below for around $20, but per Shop Jimmy "A horizontal line on the screen is virtually never caused by a bad T-con board". However in some cases they are, and where you mentioned the video lags behind a bit, then there is a solid chance the T-con could be the root cause:
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