Vetical line is the sign of failing LCD controller (t-con) board, which is part of the LCD panel assembly, it will get worst with more lines. You can try looking at the ribbon cable that is attached to the LCD panel and the Logic board to see it is not seated properly. You can look at what the connection looks like here:
http://s807.photobucket.com/home/budm/allalbums
You may also look for bad caps in the logic board and power supply board also.
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