I have just moved to a place which has an existing Pioneer LED TV where everything seems to go in through a Pioneer AV Receiver which is connected to a surround sound system etc. Cant get Roku to work with that setup, while DVD etc are working fine. I have another standard TV with 'normal' 'component' inputs and that is working fine. Do I need some special cables etc? The Pioneer AV Receiver is model: VSX-816.