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FIOS TV pixellation fix - attenuate to SNR 31

Discussion in 'TiVo Series3 HDTV DVRs' started by AbMagFab, Nov 19, 2007.

  1. Phantom Gremlin

    Phantom Gremlin New Member

    1,555
    0
    Jun 20, 2002
    Tualatin,...
    My experience with errors on FiOS is very channel dependent. E.g. right now channel 502 KATU, frequency 513 MHz, has no RS corrected or uncorrected. But channel 780 Disney, frequency 327 MHz, has a few RS uncorrected and many many corrected.

    Detailed info:
    channel 502, 37 dB, 0 uncorrrected, 0 corrected, 475 seconds.
    channel 780, 34 dB, 13 uncorrected, 1,390,000 corrected, 490 seconds.

    The one with errors is national, the one without is local. Which probably means the two blocks of channels are being combined by Verizon locally. But even on the channel with reported errors, they occur infrequently enough that as a "casual" viewer I haven't noticed them in the program itself.

    I haven't experimented with adding attenuators or diplexers, but I may try them just to see if I can get the error count to decrease.
     
  2. richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    My experience as well. I haven't seen any issues (macroblocking, etc.) for a long time. As long as it behaves I don't think I'll try any tweaks (if it ain't broke..etc. - Sorry MPSAN :p ).
     
  3. chriseng

    chriseng New Member

    5
    0
    Sep 26, 2009
    Anyone having this issue recently? These four channels have been exhibiting the macroblocking problem described in this thread for the past few days. Previously they worked fine. I don't have any attenuators, but I never needed them before. The diagnostics screen shows millions of RS Uncorrected after just a few minutes. SNR jumps from low 30s to single digits to teens, it's all over the place. Sometimes the Tivo even pops up the message saying it's trying to tune in the cable source. Any ideas? No other channels are affected as far as I can tell, just these (unfortunately, three of my kids' favorite shows are on 256, Nick Jr.).
     
  4. richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    I had a few issues the other day...some channels were unwatchable. I ended up rebooting (pulled the plug...waited 10 seconds and plugged it back in) and everything was fine. No idea what happened.
     
  5. MPSAN

    MPSAN Active Member

    1,194
    1
    Jun 20, 2009
    Portland,...
    Yeah, if it ain't broke...

    Anyway, mine seems to be OK, but I do see a little noise, or breakup, once in a while on a lot of stations. Audio is fine, and it is just for a few lines of video for a second or so and even then it is not a full line from left to right.
     
  6. chriseng

    chriseng New Member

    5
    0
    Sep 26, 2009
    Yeah neither soft reset or hard reset fixed the problem. I'm skeptical that attenuation is needed since I've had this FioS/TiVo combination for months now and never had picture problems. But that's probably the next thing to try. I'm sure Verizon won't be able to help.

    EDITED to add: Crap, it's a lot more channels than I thought. I just flipped through all of them. It seems to be certain frequencies:

    Chan Freq

    77 609k
    107 609k

    122 627k
    123 627k
    125 627k
    132 627k
    161 627k
    163 627k
    168 627k
    189 627k
    198 627k
    259 627k

    187 603k
    213 603k
    214 603k
    218 603k
    219 603k
    222 603k
    253 603k
    254 603k
    255 603k
    256 603k
    273 603k

    641 591k
    681 591k

    664 597k
    665 597k
     
  7. Phantom Gremlin

    Phantom Gremlin New Member

    1,555
    0
    Jun 20, 2002
    Tualatin,...
    AVSForum.com has local HDTV threads.

    Perhaps you will find some kindred spirits to commiserate with, or at least to confirm that others in your local area are seeing the same problems.
     
  8. caughey

    caughey Member

    275
    0
    May 26, 2007
    Orange County
    Don't be too sure that Verizon won't be able to help, I've found them to be competent.

    Also, check your coax cables and connections. I've only had pixelation problems with a specific frequency range of channels twice. Once it was fixed by replacing a cheap splitter, and once just by tightening a connection that had worked loose.

    Good luck!
     
  9. richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    And someone mentioned earlier that it turned out to be their cell phone that was wrecking havoc? Once they turned it off things were good? There are certainly a lot of possibilities. With that many problematic channels I agree it's probably part of the cable system, a connector or possibly a failing cable card. I'd do some inspections of the various parts and pieces around the house...they don't last forever. If that doesn't turn up anything a call to VZ is in order IMHO.
     
  10. chriseng

    chriseng New Member

    5
    0
    Sep 26, 2009
    Fixed! In case anyone was curious:

    The technician they sent out had never seen this problem before, so I had to suggest the debugging steps once we got past "the signal is strong" -- swapping out cablecard, swapping out coax, swapping in STB for TiVO, etc. -- but eventually the culprit turned out to be the ONT. Naturally the last thing we tried.
     
  11. richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    The ONT...who would'a thunk? Glad things are back to normal again. Enjoy!
     
  12. Ovit311

    Ovit311 New Member

    12
    0
    May 21, 2010
    Old Tivo user but new to FIOS. Had the installer put an attenuator on the Tivo just in case any pixelation problems. So far so good...
     
  13. richsadams

    richsadams Active Member

    8,893
    2
    Jan 4, 2003
    Try removing it and see how things go...odds are you won't see any problems w/o it either. The need for attenuators went away over a year ago when VZ began dialing their signal strength back to reasonable levels.
     
  14. MatthewH12

    MatthewH12 New Member

    5
    0
    May 30, 2010
    Has anyone ever heard of a TivoHD with Fios using an MCard having an SNR of 37-38 on Tuner 0 with no pixelization, and a SNR of 25 on Tuner 1 with lots of macro-blocking, pixelization and channel tuning issues? Why does it only affect one tuner and not the other?
     
  15. wmcbrine

    wmcbrine Ziphead

    10,369
    22
    Aug 2, 2003
    Are they tuned to the same channel? If not, that's pretty normal, yeah. The channels don't have a consistent signal level; most of them are within spec, most of the time, but sometimes some of them go out, while others are fine.

    If they are tuned to the same channel, then it sounds like a problem with the TiVo.
     
  16. MatthewH12

    MatthewH12 New Member

    5
    0
    May 30, 2010



    It affects tuner 1 (whose snr is ~27)mno matter what channel its on, and does NOT affect tuner 0 (whose SNR is ~37-38), no matter what channel it is on. Tuner 1's signal is so low that it won't pull in a picture, yet tuner 0 will just fine. Already spoke to TiVo, they said it's probably the cable system, but why would it only affect one tuner? Also, my tivo upstairs (Same model, etc), doesn't have an issue with either tuner, and both SNR's on it are 37-38 constant.

    It's weird =\.
     
  17. wmcbrine

    wmcbrine Ziphead

    10,369
    22
    Aug 2, 2003
    It wouldn't, and it's pretty absurd for them to say that. Call back until you get someone competent. Your TiVo is defective, end of story.
     
  18. MatthewH12

    MatthewH12 New Member

    5
    0
    May 30, 2010
    If that's true, it would make the 2nd bad tivo we've gotten, the first one had a bad cable card slot.

    Tivo's sending out another box, 3rd times the charm right?
     
  19. Dec 2, 2012 #859 of 866
    PooperScooper

    PooperScooper New Member

    44
    0
    Aug 22, 2007
    Leominster, MA
    Not much action here lately but after reading this thread I thought I had a solution with pixelization but the SNR on the affected channels is not "high". I just got FIOS a couple days ago (triple play with ultimate HD) and Showtime HD, SpikeHD and MGMHD all have pixelization. And each channel has an SNR of 30 (29 sometimes on Sho) and RS uncorrected counts always climbing. Channels that work fine have an SNR of 32 and 0 RS errors.

    The tech installed 2 splitters: ONT -> splitter 1 ( Network, 2nd splitter) and splitter 2 with 3 outputs, one is the TivoHD. I tried ONT->TivoHD and nothing changed. The same TivoHD connection worked fine with Comcast using the same splitter.

    I could try swapping the TivoHD coax, I guess. Is there some sort of signal "control" on the ONT a tech could dial up a tad? Do I need a signal booster?

    larry
     
  20. Dec 3, 2012 #860 of 866
    shamilian

    shamilian Member

    442
    0
    Mar 26, 2003
    NJ
    Check your signal level. ( on the DVR Diag screen ). It is likely at 100% add attenuators until the level is below 100% and the SNR is below 35db.

    You may also add a low-pass filter from FIOS tech. Their moca signal may affect the tuner in the Tivo.
     

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