Thanks Kimbo: When I set the TV to 16:9 , 1080i , and 4:3 (480i) stretch as you suggest most channels fill the screen correctly except for some like CNN which evidently doesn't come in in HD. I need to use the TV remote and set the 'picture' button to zoom 1 to fill the screen vertically for these channels. However, if I leave it on zoom 1 the other channels 'overfill' the screen vertically . Evidently there is no control for this that will automatically regulate the signal for all channels and all signals. The settings combinations available for the picture are many . For certain combinations there is no zoom control . I would like to know what combination is optimum. Thanks for your help.