Wo you providing more detailed info (exact make/model of components involved). Old receivers that don't have HDMI hookups... one way to deal with it is.... have the receiver switch audio and have the TV switch video... so for example instead of BluRay (audio+video) ----> Receiver ----(video)---> TV, you do:
BlueRay (audio) ----via toslink---> Receiver.
BlueRay (video) ----vid HDMI----> TV.