Just purchased a HD-52G886 jvc projection tv. I have a dish network hd receiver. The quality on HD broadcasts is great but the majority of the stations in SD is very poor. Not sure if i have set up everything right. The picture in sd is fuzzy and not well focused. Any idead how to impove. I called the dish help desk but they check a few things and said everthing should be ok, it must be the tv !!!!! Any input would be appreciated.