Model # LT2722, set comes on, sound is ok, but just a raster, with no video. it won't change input by the front button, but there is no display to see it! Press any button, & the on screen display looks like it's way off frequency. Just see a lot of lines going accross the screen, where the OSD should be. Parts, & service are in California. Anyone see this problem, or know of another brand using the same boards? Dani.