Sir the problem of your unit is in the power supply it has already a bulging capacitor this bad capacitor is producing a low and unfiltered dc output.
If you see this bad capacitor replace it with same type and also try to observe the solder part of your pcb if there is a cold solder or loosed solder.
If you see this resolder it but be sure not to connect separated pins if accidentally solder may caused much damage to the unit. Note before doing this be sure to unplug the unit. Good day and best regards.
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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