Has the TiVo previously worked for you with this or any other brand STB?
While there *could* be a fault I will very much doubt it is hardware as in all my time fixing TiVo's it is very rare indeed for the IR controller to fail, and if they do it is a "go or no-go" mode, not a disparity in waveform analysis.
A little more information would be handy, including the model number of this STB and the IR code number you have tried to use.
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