Hi, recently got 1 of these TV's and read all the posts on here!. Got a query! On my set I have a grid of lines on the screen. Is this supposed to be there? They are more apparent vertically and are especially visible in the side bars if you watch 4:3 broadcast in 14:9. Looks to me that almost a 1/5 of the screen is made up of these lines! Wondering if there may be a fault here. Any one else got these?