On my TV I get intermittent horizontal lines across one part of the screen. These occur whatever the Input is. One way of establishing where the fault lies would be to individaully connect each device by its own HDMI connector, and TV aerial directly. However I do not believe this is possible because everything goes through the One Connect box. I cannot find an adaptor with Male One Connect and Female HDMI. I recognise this wont tell me if a direct connection from the TV aerial has the issue.
Any suggestions how to fault find would be greatly appreciated.