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You may not have a problem at all. During the past year, we had several new channels added to our current channel lineup in the Phoenix area. But for several weeks before these channels began regular broadcasting, the "Mode Not Supported" message appeared on the eventual new channel slot on my two Samsung TV's. However, only a blank, black screen appeared on my Sony TV.
I suggest you let us know what these channels are (City - Channel number - Subchannel number - Station call letters) so it can be investigated further.
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