First problem on two newest TV sets is a video/sound sync problem between living room TV and Kitchen /tv on same channel. Creates an irritating echo sound. Comcast tech rep says this is normal????? Second problem on two older TVs they had an DVD RF converter RCA in Coax out to A/B sw and coax cable in to A/B sw. No changes were made other than hook digital box cable to sw which works fine but DVD now will not play as get snow. This side of A/B sw should be separate from digital input like it was before so do not understand this problem (on two TVs). They played on channel 3 before. I tried 4 as well as others and none work. I took one DVD and hooked up to new tv through RCA and it worked. Put the A/B sw on with the rf and it does not work. I am at a loss.