I have a new flat screen tv. I can set it up to work on antenna and on Dish but cannot get it to program on cable. What am I doing wrong? It goes in a RV. I am going straight to it with a co-ax. I have tried TV, HDMI1, HDMI2, HDMI3, component. I have it set for cable.
				
			 
				
		 
 
		 
 
		 
 
		
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