Advertisements I'm having a an issue *all of a sudden* on my TiVo Bolt. ONE tuner is not functioning at ALL (all channels show error V53), whereas the other 3 are working just fine. I have Comcast and spent an hour on the phone with them re-pairing the cablecard with this Bolt. We even tried my other cablecard from my Premiere (where all 4 tuners work fine) and the same thing happens (one tuner does not function) when it's paired to the Bolt. I have 92% signal strength and 37dB SNR on all of my channels (again, tuning any of the other 3 tuners to the SAME CHANNEL works fine, but tuner #1 does NOT). The only thing I can see is that on the Bolt, on the conditional access screen of the cablecard configuration, the line "ActivePrg: <0> 2 3" does NOT include tuner 1, which is the malfunctioning tuner (On the Premiere, that line is "ActivePrg: <0> 1 2 3"). Comcast says they don't have any control over whether this tuner is active -- it's the TiVo box that is supposed to activate and use it, but I'm not 100% sure about that -- I have a feeling that only a VERY senior engineer is going to know the answer to this. In TiVo diagnostics, the malfunctioning tuner shows Signal Lock YES, but Program Lock NO. There are a few RS Uncorrected errors, but <100, and they're not incrementing. And as I mentioned, this was working fine a few days ago . I've tried going back through Guided Setup, no change. I really, really, am trying to resist the Delete Everything option as I don't want to lose my recordings, but if I have to, I will. Does anyone have a clue about what could be going on? Tivo support indicated that my SNR was TOO HIGH (37-38dB) and said they won't look further into this until I can get it attenuated down to a max of 35dB, since that's the "limit" of QAM256. I remember there was an issue with the TiVo HD years ago with too-hot signal, but I thought they fixed that in their RF design . So, I'll try to find my attenuators and give that a shot. Edit: Found my attenuators and attenuated down to 35dB -- same busted tuner #1.