I have a sony bravia xbr 75 940d - after 1 year and 3 months (Purchased March 2017) the tv comes on and screen is a different color with some slight variations in light. (Not much though) There is sound but no picture. The Geek squad was here. They say it might be a chip that has gone out. TV powers on, sound but no picture. Left unplugged, changed cords, factory reset. Still no picture. Can anyone help as to what it is?