TV service through Cable Card on TiVo has stopped working

@XfinityEmilyB​  Thank you for the follow-up.  Yes, TiVo diagnostics reports the cable card is paired and functioning properly (receiving a signal).  BTW, this system has been functioning for well over 10+ years.

@Magicspell Perfect, thank you for checking that for me. let's continue working on this together. Please send a direct message by clicking the chat icon in the upper right corner of the page, click on the pen and paper icon, then enter “Xfinity Support” in the “To” section. Please include your name and address and I'll be happy to help.

Direct Message sent as requested.  Thank you

@Magicspell we see the message on our end, and we will continue our conversation over there!

Yes, the tivo shows it is paired and receiving a signal. However, go to the Cable Card Menu page, and on the DAVIC page and look to see if it's locked. If it's not (mine isn't), then it won't process signals. Go the the CA page in the same menu and look for status. If it doesn't say Ready (mine says not ready), it's not able to process the signals.  Comcast has no idea how to fix this. I believe it's the SNR ratio being too high on my unit. Check yours on the DVR diagnostics page. The SNR shoud be below 35 but above 29. Mine is 40-43 and Comcast doesn't want to mess with the area SNR because "no one else is complaining". Good luck to you.

I'm having the exact same problem that started at the same time.  Spent hours on the phone so far and had a technician come out that wasn't able to solve it this morning

Spent the entire day Sunday with support.  We were unable to resolve the issue and they opened a ticket to get specialized support.  Unfortunately, the issue hasn't be resolved for me yet either.

Greetings, @Hokie-Dave! I hope your week has been treating you well. Thanks so much for taking a moment out of your busy day to leave a post on our community forum. I'm sorry to hear you're having issues with your cable card as well, but you have definitely come to the right place for assistance.

If you could send our team a direct message with your full name, the name listed on the account (if different), and the service address associated with your account, I'd be more than happy to look into this for you.

To send a Direct Message, please click on the “Direct Message” icon in the top-right corner of the screen, next to the bell icon, click the "New message" (pencil and paper) icon, then type or select "Xfinity Support". Type your message in the text area near the bottom of the window and press Enter to send your message and initiate a live session.

@EG​ I know this is an old thread, but am responding since others have run into this issue more recently.  I was able to resolve my original issue by obtaining a replacement Cable Card from Xfinity/Comcast about 4 months ago.  I see that apparently Comcast will not replace Cable Cards anymore (which is a little alarming going forward).

FYI, my original Cable Card was a Motorola M-Card.  I do not recall what the replacement card was, but I don't recall it being a Motorola card.

If Comcast will not be supporting the use of Cable Cards going forward, is that the "end" of TiVo compatibility?  I was thinking of upgrading my TiVo, but if Cable Cards won't be available from Comcast how would I be able to set up a new TiVo box?

This has happened to me on and off for years. It happened again this morning. The key indicator to me is that my cable card is in the "not locked" position (DAVIC info page on tivo's cable card menu). When the card is not locked, it won't process the signal from comcast. I don't know why this happens but the tech I talked to today said it happens when the SNR ( signal to noise ratio) is off and there's too much noise or not enough signal. Apparently a T3 line went down last night and they're having issues from it. They think that's the problem and are looking into it.

My SNR is 42-43, which is deemed to be in the too high range (max is 35). I'm hoping that Xfinity can fix this.

@Romera​ The maximum is indeed a thing. I am at 42-43 and it is too high, I can't get the cable cards authorized. The tivo help page (see link above) says

• The SNR reading must be within the following ranges to give good-quality video.

  A higher SNR reading means that the video signal is stronger relative to the noise level on the line. If the SNR value is lower than the minimum, contact your cable provider, who can test and improve the signal on the cable line.
   

  1. Minimum SNR of QAM 64 is 23 dB and minimum SNR of QAM 256 is 29 dB.

  2. Maximum SNR of QAM 64 is 30 dB and maximum SNR of QAM 256 is 35 dB.

I checked and my SNR was around 38dB.  I put an attenuator on the line which brought it down to 33 but it's still getting the "not authorized" error.  I do have the PKM800 SA card so I'm guessing it's the clock issue.  Mine shows that the CA time is 2129 and the expiration is 2129.  

Have worked with tech support today and they have tried to send resets with no luck.  Only option at this point is to get an X1 box or cancel my service and move away from TIVO.  Sad that they aren't going to support us any longer.  

This is good to hear.  I know my card that stopped working was attempting firmware updates over the past couple of weeks.  Looks like possibly it didn't get updated.

Thank you for that clarification @par32!  Are you able to attempt replacing the device in a local Xfinity Store?

my mom's tivo stopped working as well...xfinity cable card, all channels show 'this channel is not authorized. contact your cable provider for more information (V58)' I'll call xfinity on her behalf, but I'm not expecting anything helpful.

fwiw, xfinity support (in India, but it seemed like the guy had some idea what was going on) said that the cable card 'was expired' and it would no longer work. ever. they're willing to 'give' us a 'free' cable box for a year.  then it'll be $10 a month. that [Edited: Language], 'cause it's not tivo. 

thanks for the post. Since this was my mom‘s machine, and I was working with limited time and energy, I went ahead and got the X one box for her. It is not nearly as good as the tivo in any way, shape or form, but we needed something that would get some form of television working for her quickly and that’s what we got. disappointed but not surprised.