Had the same problem. Was quoted $800 to fix. Searched the internet for 6 months and found this thread on avforums.com
http://www.avforums.com/forums/showthread.php?t=462873&highlight=black+line+on+plasma&page=4
Read through all the posts. Very simple fix, but you have to have some mechanical inclinations or you can cause more problems than you started with. I was up to 5 of the black lines, but decided to attempt the soldering these guys did and fixed it all for the cost of a soldering iron! Even if you decide not to attempt it, it gives you somewhere to start to tell a technician.
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