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More often than not, this is a case of trying change the channels on the TV instead of changing the channels on the Direct TV box.
Leave the TV on channel 4. Change the channels by using the Direct TV remote and/or by using the Channel Buttons on the Direct TV box. While you keep it on Channel 4, the TV will show whatever channel you have set on the Direct TV box. For that reason, only change channels on the Direct TV box.
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