Mitsubishi WS-55711 only 2 channels

Got a used WS-55711 from a friend to watch football in the shop. Worked before I moved it to its new home, now I only get 2 channels. Seems to switch trough about 5 channels in a loop, but 3 of them are just snow. The signal comes from Cox analog cable that works on all the other tv's, nothing else is connected to the tv.