My trinitron 14" has a good sound and the cable signal is okey,but no picture only green mute display

So there's sound, but all that displays is the word "mute" in green?

Or only the color green appears? If this is the case, is it only this input or others? Have you double-checked the connections are good and correct? What are you connecting to the TV? Makes and models of everything please. Also include the model of your TV please.