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Hi Sam , I`m JackPerhaps I can help you with this problem but first a few questions , let me know when you see this
I can tell you that those vertical lines alone would be quite repairable by replacing the t-con board but that dark spot is the more serious problem here and you are correct , this is not just some adjustments and as a matter of fact this looks very much like a defective panel if that dark spot is there not matter what is on the screen , TV's own menu included , was going to ask you about the TV's menu but I`m sure that this spot won`t disappear when the menu is opened.
Anytime you have horizontal lines , shadows or blobs /spots etc. on a lcd tv and it shows over the menu then it is a sure sign of a defective panel.As a rule of thumb the LCD panel cost around 80% of the original cost of the tv and then it has to be stripped down and rebuilt around the new panel and then again that is if you can find a new panel.When under warranty most companies will replace the tv , not the panel.Sorry to say but this makes the tv practically un-repairable due to the high cost and again that is even if you could find a replacement panel .
Sorry to be the bearer of bad news today but i`d rather tell you straight and spare you a waste of time and money
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