A/V component wires to a HD box with only 3 jacks - XFinity

#1
I have an HD set box on an older TV that has RGBYW (component) wiring. The cable box only has three jacks for RWG. I have sound but the picture is in black and white. I've purchased an HDMI to Component converter box that accomodates all the wires and connected the converter box to the comcast box with an HDMI cable. Now I have no picture and no sound. Any idea how to solve this?


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