Are you talking about a series 1 TiVo or an Australian TiVo HD?
I have similar problems with a Samsung LCD, the TV input button works using the codes but cannot use the arrows to choose an input and no key to confirm which input I want.
I found with the Samsung that if I pressed the TV input multiple times it scrolled through the inputs, then when I was on the correct input I just pressed volume up or down which would make the input menu go away.
It's not perfect but worked in the end.
If you cannot get it to work and really bugs you, the only option is to buy a programmable remote.
Peter.
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