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Cant get existing Comcast cable box to connect to new Sharp TV in color

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Cant get existing Comcast cable box to connect to new Sharp TV in color

My new Sharp 50" 4K TV is only showing in black/white. I have my existing Comcast DVR cable box connected to it with AV plug since I cant run HDMI to it. Using the "format" button on the cable box I changed the setting to 480i which gives me a picture but only in black/white. If I change to the 3 higher settings I get a double picture in black/white.