The only way I can see is hooking the video output of your Blueray to your TV then used a adaptor RCA to Minijack to hook the Blueray sound to your SA-PT 550(Jack in frront), I can't tell you if you will have a surround sound but there is none other choice with this HT!
Hi I have a Toshiba Regza HD tv, a Panasonic DMP-BDT210 blu-ray player, a Panasonic SA-PT760 dvd player with surround sound and a Scientific American cable box. All units have hdmi and optical cable capabilities. I would like to connect the blu ray to the surround sound. (If we could connect the tv to surround sound too, that would be great!) I have tried connecting the dvd players using the optical cable as I was instructed by the sales clerk, but it doesn't work. I am open to suggestions. Thanks!