I have a 50" Panasonic plasma and I connect my JVC S-VHS VCR to the AV input on the plasma. S video takes over the input and component cannot be selected. However if I connect just the S video lead the picture rolls vertically, but if I also connect the composite plug then the picture is stable. I use component for my DVD and the PC input with a Syncblaster for my terrestrial digibox. Is this right?