Samsung LE40 M868BD Dark patches

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I have a Samsung LCD TV (LE40) and it's just under 3 years old and it has developed dark patches pretty much all over the screen, the worse one being on the right (see pic).
I was just wondering what people think the problem is and what would cause this problem. I'm sure it should last more than 3 years...
I would normally have a go at most repairs but I think this one is a bit too complicated for me. I just like to have some sort of idea so when I take it to the repair shop I can have an idea what to expect.
The dark patches are on all channels and all inputs, Both HDMI's (DVD and Sky HD) and on the tv's own menu screen..
Obviously the blue screen is from an un-used Sky channel. This shows the problem up better.

Any clues would be great... Many thanks, Phil.




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