1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Tivo HD Pixelation Troubleshooting

Discussion in 'TiVo Series3 HDTV DVRs' started by Chimpware, Aug 3, 2007.

  1. Aug 15, 2008 #821 of 1597
    markpickett

    markpickett New Member

    15
    0
    Dec 29, 2001
    Dallas, TX
    Thanks for the info. I gave the details in a previous post. My problem is intermittent pixelation and sound cutting out. It's only been happening for the past week, and I've noticed that it happens around the same time each night and gets better around the same time. The strange thing is that the signal strength and SNR numbers are the same when I have a picture and when I don't.
     
  2. Aug 15, 2008 #822 of 1597
    richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    Really not strange at all...your signal is borderline and you're lucky to be seeing anything. Most of the time TiVo will be "all in" or "all out". It sounds like it's doing its level best to produce A/V at all.

    The variations at the same time every day are another clue to a signal problem. As suggested, a review of all of the cables, etc. is in order but with that second data point a call to your cableco will most likely get things resolved.
     
  3. Aug 16, 2008 #823 of 1597
    V7Goose

    V7Goose OTA ONLY and Loving It!

    392
    8
    May 28, 2005
    New Mexico...
    Your error counts are showing you that you have a signal problem, and it is not the strength if the signal. IMHO all this "hot signal" and "attenuation" stuff is a red herring! You will find that all the good channels have 0 error counts, both corrected AND uncorrected almost all the time. If you don't have one of their STBs, get one for as long as it takes to make them fix this problem. Use the diagnostics screen to show that even their own equipment is having signal errors. See more info in my posts in these threads:
    http://www.tivocommunity.com/tivo-vb/showthread.php?p=6580907#post6580907
    http://www.tivocommunity.com/tivo-vb/showthread.php?t=315826&page=35

    I agree with you that it is ridiculous that such an expensive piece of equipment as an S3 or HD TiVo cannot correct signal errors as well as the cable company STBs, but that is a different issue. The errors should NOT be there in the first place. Error correction should only have to deal with an occasional signal glitch, not a constantly bad signal. Verizon will find and fix the problem, but only after you PROVE to them it is not your equipment, then yell and escalate until someone high enough kicks them and forces them to do their job. Good luck!
    Goose
     
  4. Aug 16, 2008 #824 of 1597
    richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    VERY sound advice! :up: :up:
     
  5. Aug 18, 2008 #825 of 1597
    Frederick H.

    Frederick H. New Member

    9
    0
    Nov 9, 2004
    Sarasota,...
    I have had the pixilization problem and have been reading this thread for a while. However the problem wouldn't remain on a particular channel. I figured Verizion was just re-adjusting things. It would clear up on one channel but appear on another, but only on one of my two Tivos, the TiVo HD, but not the Series 3. Since both TiVos are connected to the same wall box by one splitter they should be getting the same signal strength readings. I was checking all 4 cards for errors, corrections signal strength etc as mentioned in this thread. One card in particular in the TivoHD had the most trouble. I pulled the power plug, reseated the card serveral times and haven't had problems since. (this was about two weeks ago).
     
  6. Aug 19, 2008 #826 of 1597
    bhaas

    bhaas New Member

    174
    0
    Aug 5, 2003
    MD
    actually, Reed-Solomon FEC, depending on the overhead, can perfectly correct randomly-distributed errors as bad as a Bit-Error-Ratio (BER) of 1E-6. It does not generally perform as well if the same # of errors are clumped together, in "bursts".
     
  7. Aug 19, 2008 #827 of 1597
    fpp777

    fpp777 New Member

    42
    0
    Jan 17, 2008
    I too have a sporadic pix problem. I have ordered an attenuation pack from smarthome. When I add the attenuators should I power off (unplug) the Tivo or just unplug the cable?
     
  8. Aug 19, 2008 #828 of 1597
    ursa99

    ursa99 New Member

    35
    0
    Aug 21, 2005
    You can just unplug the coax, attach the attenuators and reattach the coax to the TIVO.
     
  9. Aug 22, 2008 #829 of 1597
    richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    Um, okay...sounds very wise; "forward error correction codes" and all (even though I've no idea what it all means). :) The advice I was supporting was to not let the cableco's get away with telling you things are fine...it must be your TiVo. Keep after them until everything, the signal in particular, is indeed as it should be. How they get to that point isn't really of concern IMHO, at least to me. ;)
     
  10. Aug 28, 2008 #830 of 1597
    Gregor

    Gregor Active Member

    46,749
    15
    Feb 18, 2002
    :up: to a great set of debugging instructions!

    Got the attenuators last week before the install, and tonite while watching the convention I was seeing some pixellation on channels 811-815 so I popped them in to start. The PBS station was rock-solid so I could determine it wasn't a source problem.

    Popped in the attenuators, for me -10 seems to be the right number as the error counts stay at zero and the picture stays solid too.
     
  11. Aug 30, 2008 #831 of 1597
    richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    Thanks for the update Gregor...good info. :up: Still no FIOS here. :( AFAIK (and according to one of their techs) they installed everything in our area back in June, but haven't offered it up yet. They did the same thing in my brother in law's neighborhood across town last year and within a few weeks it was available. :confused:
     
  12. Sep 1, 2008 #832 of 1597
    LDLDL

    LDLDL New Member

    88
    0
    Jan 12, 2002
    Brookhaven, PA
    Here's my scenerio...
    New HDTiVo.
    M card (Comcast) (Motorola)

    Tuner 0:
    SNR - 36db
    Signal Strength - 93 - 100
    RSU - 0
    RSC - 0
    This is mostly the same regardless of what channel it's on.

    Tuner 1:
    SNR - 34db
    Signal Strength - 93 - 100
    RSU - 4,000+ and constantly rising.
    RSC - 40,000,000+ and constantly rising.
    This is after being on any channel for about 12 hours.

    Comcast tech changed all of fittings in the house. Will return on Tuesday to change fitting outside on pole.

    Called TiVo and they suggested that it is a card problem.

    What do you fine TiVo experts think?

    Thanks for your help!

    PS...
    I really do love my TiVo and have missed it ever since I got rid of DirecTV. I just want the picture I had with my Comcast HD STB.
     
  13. Sep 1, 2008 #833 of 1597
    hkancyr

    hkancyr New Member

    67
    0
    Jan 20, 2002
    CT
    Since June my HD channels have refused to come in. They pixelate and lock, occasionaly even reboot. I have already gotten a couple new cards and a different TiVoHD from TiVo. I have had the Comcast guys out here and they changed cards, rerigged every splitter, and even ran a cable directly from the distro box (which feeds 6 units) to the TiVoHD with the same result. My signal has always been 100 and my SNR is 37-38. After reading most of this thread it seems like attenuators will solve my problem, anyone think differently? I ordered the attenuators and will keep you advised. I am in New Haven (CT) Comcast area.
     
  14. Sep 1, 2008 #834 of 1597
    LDLDL

    LDLDL New Member

    88
    0
    Jan 12, 2002
    Brookhaven, PA
    Out of curiosity, how was your cable before TiVo. In other words, did you have an HD STB from Comcast?
     
  15. Sep 1, 2008 #835 of 1597
    mazman

    mazman Member

    158
    0
    Nov 13, 2002
    Alamo, CA
    I had the exact scenario months back. Turned out that one of the two tuners in the Tivo was bad. Called them and they exchanged it.
     
  16. Sep 1, 2008 #836 of 1597
    LDLDL

    LDLDL New Member

    88
    0
    Jan 12, 2002
    Brookhaven, PA
    I guess that's what I get for getting a refurbished unit!
    Now I have to go through the whole friggin headache of packing it up and sending it back!
    Why didn't the TiVo tech recognize this and suggest that I send it back instead of getting my hopes up by telling me that it's the card.

    Did the new unit correct the problem?

    Now the tech will come here with new cards and we will problably have the same problem.

    I'm going to let him come back and I'm going to try two cards just to see if you're right....
    I hope you're wrong!
    Thanks for the reply!
     
  17. Sep 1, 2008 #837 of 1597
    mazman

    mazman Member

    158
    0
    Nov 13, 2002
    Alamo, CA
    My replacement unit has worked fine.

    One way to prove that one of the tuners is bad is to force a channel which has lots of errors on Tuner 1 onto Tuner 0, and see if it the errors go away on Tuner 0.

    Good luck.
     
  18. Sep 1, 2008 #838 of 1597
    LDLDL

    LDLDL New Member

    88
    0
    Jan 12, 2002
    Brookhaven, PA
    No, it makes a lot of sense!
    No errors on Tuner 0 at all, all the errors are on Tuner 1.
    Now I have to go through the headache of sending this S*** back!!!!!
    I am not happy!
     
  19. Sep 2, 2008 #839 of 1597
    hkancyr

    hkancyr New Member

    67
    0
    Jan 20, 2002
    CT
    LDLDL,

    I've had TiVo's since S1 days and I have 3 S2,s and the TivoHD.
    They have all been great til June. I have a HD STB also on another TV which I use with a TiVo dual tuner. The other TiVo's and the STB are working fine.
    The only thing I can think of is that Comcast cranked up the cable for someone in my 6 unit condo in June and this is the result.
    Some of my SD channels were pixelating today, but they don't lock the system up, they just get over it after a second or two.
    I should be receiving the attenuators tomorrow, so we will see what we will see.
    As I said I traded in my original TiVoHD when this thing started happening. Therefore I doubt the THD was to blame.
     
  20. Sep 3, 2008 #840 of 1597
    hkancyr

    hkancyr New Member

    67
    0
    Jan 20, 2002
    CT
    Cable guy here today but no attenuators. Cable guy poo poo's the idea that the signal is too hot. TiVoHD reboots on it's own a few times and I call TiVo support and the first guy goes through a million troubleshooting things and finally tells me to try the component cable instead of HDMI. I called back to tell them I couldn't find the component cable and got Denver instead of Indianapolis. The new dude says "what is you signal strength." I tell him and he says it's too much, it has to come down to between 80 and 90% if you want the CC to be happy. I told him I was expecting the attenuators imminently, and he said that they would probably fix the problem.
     

Share This Page