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Bad Tuner in Tivo HD?

Discussion in 'TiVo Series3 HDTV DVRs' started by superhomey, Mar 22, 2014.

  1. superhomey

    superhomey New Member

    9
    0
    Feb 3, 2007
    Hi everyone,

    I have an older Tivo HD unit (Verizon FIOS) that I can only watch tv on one tuner. I used to have two single stream cable cards in it. Swapped them, switched them and ultimately replaced them with a multi stream card. Nothing worked. I replaced the power supply, but that didn't work either.

    The other tuner always shows a black screen that says "Searching for Signal."

    I have a lifetime subscription on the box, so I would like to keep it, but I can't reliably schedule recordings anymore.

    Anybody have any ideas?

    J.J.
     
  2. ThAbtO

    ThAbtO TiVoholic by the bay

    6,717
    7
    Apr 6, 2000
    SF Bay Area
    Which Series 3? The OLED (TCD648) must use 2 cable cards, no matter what kind.
    TCD652 and TCD658 can use 1 multi stream, or 2 single stream cable cards.

    You may need to re-run guided setup after you have validated the cable card is paired in the cable card menu.
     
  3. superhomey

    superhomey New Member

    9
    0
    Feb 3, 2007
    It's a TCD652. I had a Verizon tech and Tivo tech on the phone at the same time. Their conclusion was slot 2 didn't work.
     
  4. ThAbtO

    ThAbtO TiVoholic by the bay

    6,717
    7
    Apr 6, 2000
    SF Bay Area
    The M card needs to be in slot 1. Slot 2 is only for a S card.
     
  5. waynomo

    waynomo My One Time TCF Club

    12,049
    36
    Nov 9, 2002
    Seven...
    Could be a bad came card.
     
  6. superhomey

    superhomey New Member

    9
    0
    Feb 3, 2007
    The M card is in slot 1. Originally I had two S cards and the techs had me swap them. They also had me try two S cards I have in a S3, but that didn't work either. Ultimately it didn't matter which S card was in slot 1, that would be the only one that worked. Crossing my fingers, I traded the S cards in for an M card hoping that would work since it would go in slot 1. It still didn't solve the other tuner issue.
     
  7. ThAbtO

    ThAbtO TiVoholic by the bay

    6,717
    7
    Apr 6, 2000
    SF Bay Area
    What does the cable card menu say? Is it paired? Does VAL: say anything other than VAL: ? (this mean unpaired).
    Is the card linked to your cable billing account?

    Using a M card, you do not need another card in slot 2.

    Sometimes it may need to be done in a specific order, billing, pairing, re-run Guided Setup.
     
  8. superhomey

    superhomey New Member

    9
    0
    Feb 3, 2007
  9. unitron

    unitron Active Member

    16,387
    2
    Apr 28, 2006
    semi-coastal NC
    Is this a cable tuner only problem? Can you stick some rabbit ears or an unbent paper clip into the antenna input and tune an OTA signal on both tuners?


    While trying for 2 cable channels, go into Account & System Information, DVR Diagnostics, and see if you have a problem with one of them not being able to lock onto a modulation type.
     
  10. superhomey

    superhomey New Member

    9
    0
    Feb 3, 2007
    Looks like Tuner 0 locks the signal and modulation stays on QAM 256. Tuner 1 does not lock the signal and the modulation goes back and forth from QAM 64 to 256.

    It did this when I had two single stream cards and now with a multi stream card.

    I emailed Weaknees and they said they've never seen this and not sure they can fix it. Ughh!
     
  11. SNJpage1

    SNJpage1 Active Member

    3,681
    11
    May 25, 2006
    Atlantic...
    Can you record a show on that tuner? I had a problem for awhile where I couldnt watch a channel live but I could record it. It eventually fixed itself.
     
  12. superhomey

    superhomey New Member

    9
    0
    Feb 3, 2007
    It will try and record a show, but it just records a black screen.
     
  13. unitron

    unitron Active Member

    16,387
    2
    Apr 28, 2006
    semi-coastal NC
    Do you have any analog cable available?

    Have you tried seeing if both tuners work when both are tuned to Over The
    Air stations?

    Unlike weaKnees, I think I have seen it.

    But I haven't figured out a fix yet, since it'll probably mean very tedious unsoldering and resoldering Surface Mount Devices in a trial and error substitution scheme.
     
  14. superhomey

    superhomey New Member

    9
    0
    Feb 3, 2007
    I put a paper clip in the antenna in and was able to get quite a few channels, but only on tuner 0. Signal strength was really good for tuner 0, but no signal for tuner 1.
     
  15. unitron

    unitron Active Member

    16,387
    2
    Apr 28, 2006
    semi-coastal NC
    Okay, the one I have does fine on both tuners on OTA, but only one will lock on modulation scheme on analog cable (don't have any cable cards or a digital cable sub), so I'm suspecting on of the chips used and fed by that tuner.

    But your case (the tuner itself as it brings in a signal at a specific frequency before downstream circuitry figures out what kind of signal it is) makes me wonder if you might have one or more capacitors on the power supply which, even if they don't show it visually, are going bad.

    One of the early trouble reports that turned out to be due to "capacitor plague" was Series 2 DirecTV TiVos where one tuner worked fine and the other one didn't.


    S2s and S3s are so likely to have power supply problems that one really needs to make sure there's no problem with it before one can put any faith in any other troubleshooting.
     
  16. unitron

    unitron Active Member

    16,387
    2
    Apr 28, 2006
    semi-coastal NC
    Since it's lifetimed, you could do like I did with mine and put it (and a small TV/Video screen and speakers) on top of the refrigerator with rabbit ears and wireless adapter and use it to watch local news or shows copied from another TiVo or PC while you're chopping celery or washing dishes.
     

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