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brief A/V dropouts over HDMI

Discussion in 'TiVo Series3 HDTV DVRs' started by AndrewWK, Dec 31, 2012.

  1. AndrewWK

    AndrewWK Tivo since '99

    7
    0
    Feb 20, 2009
    Durham, NC
    This is a little different from some of the other dropouts I've seen in searching. The integrity of the program itself is fine, but the picture/sound will cut out for brief and random periods of only a couple seconds. Sometimes it doesn't happen for hours and other times it will happen 3 or 4 times in a row. If I rewind the program and watch the same bit again, it's fine. I have no issues with other HDMI devices connected through the same receiver, so I don't believe it to be an issue with the other components. Also, this is something that has started in the last year or so and seems to occur with increasing frequency. I'm wondering if it could a power supply issue?

    Model: TCD652160
     
  2. L David Matheny

    L David Matheny Active Member

    1,588
    1
    Jan 29, 2011
    SE Ohio
    It could be a power supply issue, or it could be a hard drive issue. If you don't mind opening your TiVo, check the power supply voltages under load, and look for bulging capacitors. (Search for "capacitor plague".) You might want to back up any must-not-lose recordings to your computer, or back up your entire TiVo hard drive by cloning it. It would be interesting to connect the hard drive to your computer and run the manufacturer's bootable standalone diagnostic on it. (Don't use Windows, and if you happen to have a Gigabyte motherboard, ask first about problems with those.)

    Could you connect the TiVo directly to the TV for a while to see if the problem ever occurs that way? That would more definitively rule out other components, cabling, etc. I suspect that you would still see the problem. I wonder if your symptoms could be caused by disk fragmentation. Does anyone know whether that can be a problem in the file system TiVo uses for recordings? There's no way to defrag a TiVo, except (I'm guessing) by doing a "Clear & delete everything" or something similarly destructive.
     
  3. unitron

    unitron Active Member

    16,387
    2
    Apr 28, 2006
    semi-coastal NC
    Any odd symptoms on that model could be power supply related, because that's one of the models that's been subject to "capacitor plague", and taking the cover off and eyeballing the caps on the power supply board before trying any other troubleshooting is not a bad idea.

    If you still have the original hard drive in there it's definitely a good time to do a backup of it, and not a bad time to upgrade to a larger one, but only after making sure there's nothing wrong with the power supply.
     
  4. AndrewWK

    AndrewWK Tivo since '99

    7
    0
    Feb 20, 2009
    Durham, NC
    Thank you for the information. Do you have any suggestions on how best to simulate load to test the powersupply?

    Andrew

     
  5. unitron

    unitron Active Member

    16,387
    2
    Apr 28, 2006
    semi-coastal NC
    Like the man said, read up on capacitor plague to learn what visible signs to look for.

    The TiVo motherboard and the drive are plenty load.

    Do you have a voltmeter?
     
  6. AndrewWK

    AndrewWK Tivo since '99

    7
    0
    Feb 20, 2009
    Durham, NC
    I apologize, I should have listed my full configuration:

    Tivo:TCD652160 (unmodded)
    Cisco tuning adapter
    twc m-card
    WD 1TB My DVRexpander

    I went ahead and ordered a replacement HDD just in case. I did the eyeball check on the PS and none of them are leaking, but a few do appear to have bulged. I saw you mentioned there is someone in Raleigh who does PS repairs. I was wondering if you could point me in the right direction?

    thank you,
    Andrew


     
  7. Jan 1, 2013 #7 of 10
    L David Matheny

    L David Matheny Active Member

    1,588
    1
    Jan 29, 2011
    SE Ohio
    As unitron said, the TiVo itself is the load. You just measure the voltages with the cover off, while it's running everything (motherboard, drives, etc).
     
  8. Jan 1, 2013 #8 of 10
    dlfl

    dlfl Cranky old novice

    6,995
    16
    Jul 6, 2006
    Near...
    There should be a large connector on the motherboard carrying lots of wires from the PS. If your voltmeter probes aren't too fat, a convenient way to get to the voltages is to probe right into the back (top) side of this connector.

    Red is 5V
    Yellow is 12V
    Black is ground

    If your probes are too fat, try improvising with paper clips attached to them.

    Even slight capacitor bulges indicate a problem. It appears what you saw was pretty obvious, so it was more than slight. Replace the caps or the PS. If you replace the caps be sure to use Low ESR types.
     
  9. Jan 1, 2013 #9 of 10
    unitron

    unitron Active Member

    16,387
    2
    Apr 28, 2006
    semi-coastal NC
    You got bulges, you got bad ones.

    I just emailed my Raleigh guy, waiting to hear back, in the meantime PM me name address phone number email
     
  10. unitron

    unitron Active Member

    16,387
    2
    Apr 28, 2006
    semi-coastal NC
    Just noticed you don't have enough posts to PM yet, so email me

    myusernamehere

    at

    coastalnet.com

    I just got off the phone with my guy in Raleigh.

    And of course my user name here is unitron
     

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