What I said, is that this is what will very likely happen if you try to send the sets a 1080p signal, in that they most likely will flat out reject it in some way if they are not designed to accept a native 1080p signal. Which in your case, is that they probably are not. If they can't accept a native 1080p source, then they just can't, and there really is nothing that you can do to try and force or fool them into doing so. Which also means that all you would probably get if you do try send them a 1080p signal, is that you would only get some sort of no viewable picture at all scenario. Now if you send them a 1080i signal instead of a 1080p, they should have no problems at all with displaying a 1080i signal.