Rc64 remote code for Nuvision TV - DirecTV

Does anyone know the setup codes for NuVision TV's to program DirectTV remote RC64?And I mean other than the 2 listed in the on screen setup. Neither worked, and produced a single flash, indicating, I believe, that the code input was not a valid code. I tried all the Mitsubishi codes, as another posting indicated they worked for NuVision, however for my TV, none worked, although they did produce a double flash after the code was input.
The Remote Code Lookup page lists 0 codes at all for NuVision TV's.

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