Fix for an apparently dead 5XXX tuner:
Originally posted by Crunchy Doodle at AVS Forum
1) Press the power button to turn the unit off.
2) Disconnect the RF coax cable from the back of the unit.
3) Unplug the unit's power cord from the wall.
4) Reconnect the RF coax cable to the back of the unit.
5) Wait at least one minute.
6) Plug the unit's power cord back in and allow it to boot up.
7) Enjoy flawless ReplayTV operation.
This revived a seemingly dead tuner for my wife's 5000 series machine.
Intuitive, isn't it?