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Tivo Series 3 - Bad capacitors in power supply

Discussion in 'TiVo Help Center' started by johnsom, Jul 25, 2011.

  1. Jul 16, 2012 #81 of 532
    CrashHD

    CrashHD I am the me.

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    Nov 10, 2006
    MO, USA
    If your laptop has an esata port, it should be possible.

    I would recommend downloading and burning a diagnostic disk from western digital, and using that to test it out. Letting windows boot up with that disk connected is risky. Some versions of windows can mess up a tivo disk.

    If that disk checks out, don't forget to check the internal disk as well. It is just as, if not more, likely to be the cause of this.
     
  2. Jul 16, 2012 #82 of 532
    Paul7285

    Paul7285 New Member

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    Jul 16, 2012
    Thanks Crash. I'll try that out.
     
  3. Jul 17, 2012 #83 of 532
    turbobozz

    turbobozz New Member

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    Sep 21, 2006
    MD/VA
    Paul,
    If the consensus is external hard drive may be the problem...
    Have you tried booting the TiVo w/o the external drive attached to see how far it gets?
    (If you don't care too much about the recordings, you could just let the S3 divorce the drive if it gets that far.)

    My personal experiences with external hard drive problems were:
    - The occasional loose esata connector
    - Forgetting to plug in the external drive's power (I'm quite certain you'd have figured this one out)
    - The external drive needing to be re-seated inside the enclosure
     
  4. Aug 2, 2012 #84 of 532
    btgulledge

    btgulledge New Member

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    Aug 2, 2012
    KC,MO
    Thanks so much HerronScott for the digikey orderlist. That should be a sticky for anyone wanting to do this themselves. Twelve dollars and a hour or so, sure beats the 100 from weaknees. But the psu took the hard drive with it, so I'm messing with that now. Once again thanks to HerronScott for the push in the right direction.
    Also is there any chance the system board could have been affected?

    -Bryan
     
  5. Aug 3, 2012 #85 of 532
    CrashHD

    CrashHD I am the me.

    757
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    Nov 10, 2006
    MO, USA
    It's possible, but rare. mainboards commonly live through multiple hard drives and psu's.
     
  6. Aug 4, 2012 #86 of 532
    HerronScott

    HerronScott Well-Known Member

    2,775
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    Staunton, VA
    Bryan,

    Glad it helped. I had been looking for this information earlier this year myself when I suspected my power supply was failing (faint wavy lines through video) so thought it might be useful for others.

    We need someone to post the same list for the HD power supply.

    Scott
     
  7. Nov 18, 2012 #87 of 532
    ATB

    ATB New Member

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    Sep 27, 2005


    Paul, My S3 went through this same bahavior and I assumed it was a bad drive too. I just this evening finished copying my 1st replacement 750GB drive (~3 yr old) to a new 1TB drive. On startup, same reboot loop. I then dug out the original 250GB drive that came with the machine and same reboot loop.

    On original inspection I thought all my caps looked okay, but after the 250GB drive didn't work and reading through this thread I took a closer look and the tops of C401 and C402 are slightly domed but not leaking. Guess I'll be replacing some caps:rolleyes:
     
  8. Nov 18, 2012 #88 of 532
    unitron

    unitron Active Member

    16,387
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    Apr 28, 2006
    semi-coastal NC
    Do you have a TCD648250? As in not a TCD652160?
     
  9. Nov 19, 2012 #89 of 532
    HerronScott

    HerronScott Well-Known Member

    2,775
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    Jan 1, 2002
    Staunton, VA
    Those were the 2 that were bulging slightly on 1 of my S3 OLED's and you are correct that they do not have to be leaking to be bad and cause power supply issues.

    Scott
     
  10. Nov 19, 2012 #90 of 532
    ATB

    ATB New Member

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    Sep 27, 2005
    Pretty certain it was a 250..thats the size drive I found to put back in. But frankly I only ever venture back here every few years when I need to replace a drive or fix something else. Meaning I'm really not sure which model I have..I'll have to check when I'm home.

     
  11. Nov 19, 2012 #91 of 532
    unitron

    unitron Active Member

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    If it has a digital clock display on the front and it looks like a thermometer on it's side, and there are buttons that duplicate some of the remote control buttons, and the cable card slots are on the back, it's a TCD648250.
     
  12. Nov 19, 2012 #92 of 532
    ATB

    ATB New Member

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    Sep 27, 2005
    Thats the one. Its a S3 OLED not a HD
     
  13. Nov 19, 2012 #93 of 532
    lrhorer

    lrhorer New Member

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    San...
    It is not a matter of theory, it is just a convention, and there is nothing wrong with flipping the conventon, as long as one does it throughout one's analysis.

    I'm afraid that is not entirely correct. Electrical current is actually a disturbance, not the flow of charges itself. The flow of charges is usually quite slow, perhaps less than 1 meter per second, and highly variable, but the electrical disturbance travels at the speed of light, only slightly slower than that in a solid medium. In a given medium, it is not variable at all. The charge velocity is dependent upon the potential difference (voltage) and the mass of the charge carriers. Finally, it does not only arise as a result of electron flux. It can also be created as a result of a flow of positive charges, such as may be the case in an electrolytic solution, for example. In semiconductors, it is the result of a flow of neither positive nor negative charges, exactly, but rather as the result of the propagation of "holes" in the semiconductor material. If you have a battery powered device at hand, the flow of electrical current may be the result of all three types of charge carrier flux. (Note, too that in an electrolytic solution, negative charges may be transported, but the carrier may not be a simple electron. It may be a negatively charged ion.)
     
  14. Nov 19, 2012 #94 of 532
    turbobozz

    turbobozz New Member

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    Sep 21, 2006
    MD/VA
    Seriously?
    Dredging up 5 month old posts to point out "problems" with the level of abstraction he reduced current theory to? His description was good enough.
    And then not even getting what you posted correct... Semi's use both electrons and holes.
     
  15. Nov 19, 2012 #95 of 532
    unitron

    unitron Active Member

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    That's just him being him for the edification of future searchers.

    Or else they're recalibrating his meds and dosages again. :)


    But seriously, he's been informative and of assistance to enough people around here that he can pick on me all he wants to.

    Now if I could just get him to employ a little more tact and diplomacy in some of his responses to others...:eek:
     
  16. Jan 20, 2013 #96 of 532
    unitron

    unitron Active Member

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  17. Jan 23, 2013 #97 of 532
    Matterhorn

    Matterhorn New Member

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    Jan 23, 2013
    I have been reading these threads for some time, and about 3 months ago, my Tivo (Series 3 HD) starting rebooting every few days. I thought it might be the hard drive, so I installed a new one. Tivo kept rebooting every couple of days, then after a month or so it reboots every few hours, so I thought I would try buying a used Tivo (same series) and replaced the power supply (capacitors looked to be okay when I installed it). Now it is rebooting every couple of minutes. I hate to throw good money after bad, but I also hate to give up at this point. Do you think the power supply on the one I just bought was also bad? Any suggestions?
     
  18. Jan 23, 2013 #98 of 532
    unitron

    unitron Active Member

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    Do you have this TiVo plugged into a UPS?
     
  19. Jan 23, 2013 #99 of 532
    Matterhorn

    Matterhorn New Member

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    Jan 23, 2013
    Yes, I do have it plugged into a UPS. Should I try plugging it in directly to the wall outlet?
     
  20. unitron

    unitron Active Member

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    I was trying to confirm or eliminate the possibility of the reboots being caused by blips in the power coming into the house, blips that might not be long enough for you to notice the lights dim.

    But if you're sure the TiVo is plugged into the UPS's battery backup outlets and not just the surge protected outlets, then the power company isn't at fault.

    It is possible for a capacitor to be going bad but not show visible signs (but if it shows visible signs it is going bad for sure).

    Do you happen to own a voltmeter?
     

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