Hi. I have purchased a second hand Triones 2812 receiver and hooked it up to the sky dish. I was able to view all the menus and channel listings on the TV screen but got a message "no signal".    I understood that all I had to do was plug in the dish cable to the receiver and move the 3 sky wires (red yellow white from the TV) from the sky receiver to the Freeview receiver.  I  disconnected and reconnected sky and checked the signal strength which was 72.  However reconnecting the FTA receiver still showed no signal.   Does anyone know what I did wrong or failed to do?
Cheers