I can't make any recommendations without inspecting the TV. If I make the wrong suggestion and it doesn't fix the issue, then you still have the problem and you paid for a part.
I'd recommend at least having the unit inspected so that the problem part - if that's what it is - can be identified. You can still get the part and replace it yourself if you'd rather not have a technician do it, but I'd get an expert's opinion. Just my recommendation.
Heard many post on the internet about this but no conclusive answer. Alot of people say to check cables, video drivers, different sources, blah blah blah. I do appreciate the people trying to help but I have not heard a decent answer for this problem.
The lines sometimes disappear and then reappear(considered "dead" pixels or "stuck" pixels??) I don't know?
I have recently did the capacitor fix with success thanks to many peoples help from forms like this, THANK-YOU!!!!
There are parts you can buy online for just over a hundred dollars that I would be willing to gamble with but what board would this be causing this problem??