I seem to have developed this problem recently. The screen flashes a bright white "negative", sometimes quickly and sometimes it stays that way for 10 seconds or so. It seems to come and go, usually when I first turn on the TV. After the TV warms up it might go for hours before it does it again, very unpredictable. Regarding the warranty extension, does that cover this problem or is it strictly an issue with the boards and therefore I'm on my own?