So, I just bought a new hometheatre system for my tv. The thing is I use tv decoder(Home Cable HD samsung GX-FM530CF) from my internet service provider to watch movies. I tried using the mono stereo sound using rca cables and it runs well, sounds came out normally. But when I try to use the surround sound feature, it makes no sound at all. I already plug in Audio Digital Optical cable for the surround sound, but it still makes no sound. Have you guys runs into the same problem?