I have a SONY Bravia KDL46XBR2. works great with one exception. I have COMCAST cable and HD. But COMCAST also has DIGITAL and ANALOG channels. Like 3-79 or so is ANALOG, 80-699 is DIGITAL and 700-799 HD, 800-up is Payperview. So if I am on 706 it is HD and looks great. If I swith to 59 for FOX it goes to analog and the screen blinks and the TV has to SYNC with the signal change. Sometimes it stays blank (black) and I have to turn the TV OFF and ON or switch channels to get it to "re-sync" then it loogs OK again. Other times when I change to 59 from HD it will be PURPLE or PINK and GREEEN like one of the color guns is out in the old Cathode ray tubes (CRT) TVs. Again if I turn the TV OFF and ON it syncs up and is fine. Back to normal colors. It does this about 50% of the time that I change between HD to a Analog or DIGITAL signal. Only from HD down to the others never the other way. I tried changing HDMI ports and it seemed to help for a few hours or a day or so. But it is getting worse. The first time it started was about 6 or so months ago maybe a year ago when COMCAST changed their menu system and downloaded a new menu system aat 2:00 AM. Immediately after that I had issues with the TV doing this. It did it just once in a while like 5% or the time but now it is up to about 50% of the time. COMCAST has checked the cabling and the signal strength and it si all OK. I have COMCAST PHONE now too and high speed Cable Modem 15-25Mb. It all seems fine but the TV keeps doing this. And only on this TV not my other one which does not support HD. Any ideas on how to get it to stop going PURPLE? It is a real pain to have to turn the TV OFF and ON anytime I change channels to digital or ANALOG from HD.