Advertisements I have a Series 3 and recently (within the past week) a bunch of channels stopped working. How likely is it there's something wrong with the TiVo itself (not the cable, cableCards or pairing) that would cause only SOME channels not to work? I'm fairly certain it's not a cableCard pairing issue, at least the status on the cableCard screens all look good. I'm 90% sure the problem is related to the frequency of the channel. All the channels below 300000 KHz get no signal (see more below). After talking to Frontier (FIOS) tech support a couple times, they suspect it's something wrong at my house and have scheduled a tech visit next week (Jan 5th). The 2 techs I spoke with, both said it's very likely a problem with the cable in my wall the cable from the wall to the TiVo the TiVo itself And if it's any of those, I'll be charged for the tech visit. Shortly after I lost the channels, I checked the signal strength on a bunch of different channels and it was much lower than I remember. If fact, the overall signal strength used to be so high I had 16dB attenuators (2x8dB) for the cable to the TiVo. A few years ago (after Frontier installed the attenuators), the signal strength on most channels was around 90%. Now, after removing the attenuators, the highest channels are 77-81%. My S3 has 2 cableCards, #1 is a single stream and #2 is a multi stream. They were both installed Sep/2010, replacing 2 single stream cards. A bit more detail... I painstakingly, went through about 100 channels and mapped the channel number to the frequency (from Messages & Settings -> Account & System Information -> DVR Diagnostics) and did see some patterns: The channels with no signal happens on both tuners/CableCards. None of the channels with a frequency below 300000KHz work (no signal). About half the channels between 300000KHz and 4000000KHz won't work (no signal), the other half work, but with low signal strength (40-43%) and are very pixelated. All the channels above 400000KHz work with 50% signal strength or higher. The signal strength seems to increase with the frequency. In other words, 500000 KHz channels have roughly 50-60% signal strength, 600000 KHz ~60-70%, 700000/800000 KHz ~70-80%. The highest signal strength is 81% on 2 channels at 849000 KHz. The SNR also seems to be related to the frequency/signal strength. The lowest SNR is 26dB on the pixelated channels in the 300000-400000 KHz range. The channels in the 500000-600000 KHz range have SNR 28-30db. The highest SNR is 32-33dB on the channels in the 700000-800000 KHz range. The cable comes from the wall to a splitter. One cable goes to the router and the other to the TiVo. One of the techs told me the splitters sometimes go bad, but only for some frequency ranges, so that's a possible cause. BUT, I tried going direct from the wall to the TiVo and still had the same problem, which should eliminate the splitter as the problem. I also tried 3 different cables from the wall to the TiVo, so that would seem to eliminate the room cable as the problem. That leaves the cable IN the wall, the cableCards or the TiVo itself. It seems unlikely the cable in the wall is suddenly going to fail for only some frequencies? Unfortunately, I don't have an easy way to verify/bypass this cable. I only have one wall cable and one TiVo... no other TVs, TiVos or cable boxes. It also seems unlikely both cableCards would fail at the same time in the same way. Sooo, what about the TiVo?? Can the tuners fail in this way? Such that only lower frequency channels get no signal? Or is it more likely to be a problem with the signal coming from Frontier? It DOES seem to be the overall single strength is less than it used to be. ie, while the mid and higher frequency channels still work, the signal strength is much less than it used to be. Any help appreciated.