I have an LG smart tv model no 49UH610V which i am trying to connect with my Samsung Blu-ray home cinema HT-F4500 via ARC. The surround sound works fine whilst blu-rays are being played but not in TV mode. I have set both TV and home cinema as ARC enabled however no joy. I am also using a high speed HD cable and it previously worked before the tv was accidentally switch off at the mains.