I couldn't find one yesterday but looking at the recent posts yours may not have died (nor mine)
I suspect you are getting GSOD (green screen of death) ?
read the post about guide data from POTS (no idea what pots is- some people love acronyms) or ac's we should call them
I have been in touch with a component supplier who may be able to supply a repair kit of capacitors for the TiVo series one psu (power supply unit)
which will be perhaps our only hope to keep our tivos running.
I have supplied a list of the component values we need and subject to those parts being suitable and repairing a known failed PSU I will post a link for the repair kit.
you will of course have to be happy with a soldering iron and understand the dangers involved