Does Comcast provide (high-definition) Universal Digital Transport Adapters that are compatible with the HDMI ports of Vizio E321VL TV sets? If not, is there a way to make my Universal Digital Transport Adapter (model name DC60Xu) compatible with my Vizio E321VL set's HDMI ports (I can only get audio, a menu, and channel numbers and names through the set's HDMI connection with the adapter).
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