Samsung TV repairs

[teamHOLDENracing]

I have a Samsung UE40C8000 TV that is about 6 years old. It is a 3D TV, so the 2D picture was of decent quality and that was the main reason I bought it. The picture has been playing up, with fine horizontal lines appearing across the whole screen (so like watching TV through a venetian blind - though sometimes it goes a bit 'tartan' with vertical lines too). Initially this would clear after 10 minutes, but then it took longer and longer and it now seems permanent and so unwatchable.

I would like to have the TV repaired and keep it if possible, but not if the repair is prohibitively expensive. Does anyone have any experience of repairs with flat screen TVs - worth pursuing or so expensive that they are not worthwhile? I seem to have a Samsung service centre very close, so would likely take it there..

Many thanks

[teamHOLDENracing]

Just saw the other Samsung TV thread - interesting that it is the same series and the same age. I have had already had the back off mine and couldn't find any swollen capacitors...