hey i switched on my f6500 today.. ive had it for about 6 months. anyway a black shadowy horizontal band was across the screen. tried changing everything, nothing worked. phoned JL, they said they;d get someone out on thursday. then when i put the phone down, magically the TV returned to normal. I have had a bit of vertical banding issues with this TV too when watching football.... and a slightly dirty white screen also but nothing major. how do i explain this to the technichian on thursday now the problem has dissapeared?