50"panasonic tv. model #PT5OLC14. two things are going wrong ,1) I get a prompt in the upper rt corner telling me the "filter is dirty and call a tech." I took it all apart and did'nt find any filter which leads me to believe there's a reset switch but where?. 2) the color has always been a little green/yellow .like it needs to go brighter but it won't ..any suggestions ?