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Tivo Series 3 - Bad capacitors in power supply

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

  1. Mar 1, 2017 #541 of 603
    Worf

    Worf Well-Known Member

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    Well, it appears my S3 fell victim (finally) - it powers up with the fan and hard drive spinning, and initially it lit up the front keypad. And once it even had the LEDs and OLED working, but after that, nothing. Subsequent power ups just had the fan and hard drive powering up, and that's it - no more front panel LEDs.

    Looked at the power supply and all the "pre inductor" ones look bulged, so I used the list in post #62 and ordered 2 complete sets of caps (might as well change them all - who knows how suspect the others are). Good well known brands (Rubycon, United Chemi-Con (Nippon Chemi-Con), Panasonic) My work has a lot of hardware engineering going on, so there's a nice solder lab there so I'll be able to change them all out.

    I'm hoping that's the problem... the hard drive I had changed a couple of years back.

    All it took was a power outage - it was working fine yesterday. Guess those crap caps just can't handle the extra power needed at startup.
     
  2. Mar 4, 2017 #542 of 603
    Worf

    Worf Well-Known Member

    2,297
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    And my TiVo is working again. Replaced all 15 caps and the TiVo started up as if nothing happened.

    I missed the clock!
     
  3. markens

    markens Member

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    Apr 12, 2007
    More thanks for all the useful info in this thread. Another success story! My TCD648250B developed the reboot problem a couple of weeks ago after over ten years of service. In my case, the unit would get all the way through the Welcome sequence, and then reboot immediately upon getting to the main menu. Several caps in the PS were visibly bloated (although just slightly), but that was enough to order a new set from DigiKey as outlined in post 61. The 11 caps were $12.50 delivered. And it did the trick -- my TiVo is happy again, and so am I!
     
  4. HerronScott

    HerronScott Well-Known Member

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    Jan 1, 2002
    Staunton, VA
    Glad to hear another one saved. :)

    Scott
     
  5. amyf

    amyf Member

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    Sep 24, 2014
    Central NJ
    Hi all. I've used this thread to repair both of my OLED S3 units a few months ago (and thank you all again). So I decided that it was so easy that I could help out a friend whose TiVo HD unit died. The symptoms are that it was working and then one day it wasn't. When plugged in, no lights, no fan, nothing. I figured that it was probably the power supply, so I opened it up to take a look. This is a 652160 with the AcBel Rev. B0 power supply and the original hard drive. None of the caps looked bad, but since that doesn't necessarily mean anything, I decided to replace the caps based on the list supplied on this thread (locations C14, C27, C17, C20, C15, C31). No happiness here as that didn't help at all. Still nothing happens when plugged in. She is hoping to get this unit working again so it can phone home and be eligible for an upgrade offer (if one comes along again). Does anybody have any ideas? I can use all the help I can get.

    Thanks,
    Amy
     
  6. unitron

    unitron Well-Known Member

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    semi-coastal NC
    Disconnect everything from the back panel, take out the cable card, and unplug the data/power combo plug from the hard drive.

    If you can hook a non-HDMI video monitor or tv to the yellow jack or the red, green, blue set, do that.

    Now plug the power supply back in and see if you get anything.

    Do you happen to have a voltmeter?
     
  7. amyf

    amyf Member

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    Sep 24, 2014
    Central NJ
    Unitron, I didn't even bother having anything plugged into the back panel and there are no cable cards. I did try unplugging the combo plug but still the same. I don't have a voltmeter either (unless there is one amongst my late father's things. Even then, I wouldn't know how to use it). Is it possible that the big capacitor at C4 failed as someone has seen on some of these models.

    Thanks,
    Amy
     
  8. unitron

    unitron Well-Known Member

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    semi-coastal NC
    Possible? Yes. Likely? I don't know. It's also possible that something on that power supply board other than a capacitor has failed (although the capacitor plague caps are about a 1000 times more likely to go bad than anything else on the power supply board). But you're at the point where you either need a meter or to borrow a known good power supply out of another 652160 or a 658000 (but not a 648250 because of that extra wire).
     
  9. amyf

    amyf Member

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    Sep 24, 2014
    Central NJ
    If I were to order the remaining capacitors (C29, C23, C4) as well as C9, do you know what I should order? I haven't seen anyone list those? I'll try to take a look and see if I have a voltmeter in my dad's stuff. If I find one, do you think you could walk me through using it?

    Thanks,
    Amy
     
  10. unitron

    unitron Well-Known Member

    16,517
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    Apr 28, 2006
    semi-coastal NC
    The big 200 Volt capacitor may have gone bad, 'though it's fairly low odds.

    The little bitty ones really aren't likely to have, but of course it's not impossible.

    But look for that meter before you throw any more money at the problem.
     
  11. amyf

    amyf Member

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    Sep 24, 2014
    Central NJ
    I found my dad's multimeter, along with the Radio Shack receipt for $18 from 1981 :) . I'll try to review the instructions for it over the weekend to see if I can figure it out. I can post a picture, if it'll help you to help me, which I really do appreciate.

    Thanks,
    Amy
     
  12. unitron

    unitron Well-Known Member

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    Apr 28, 2006
    semi-coastal NC
    The meter will have a model number of 2 or 3 numbers, a hyphen, and then probably 3 more numbers.

    Plug that number into Google, and see if you come up with any good pictures of it, and post a link to one before going to the trouble to take and upload one of the one you have.
     
  13. unitron

    unitron Well-Known Member

    16,517
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    Apr 28, 2006
    semi-coastal NC
    But I probably won't reply again 'til overnight or tomorrow--need sleep.
     
  14. Teeps

    Teeps Well-Known Member

    1,888
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    Aug 16, 2001
    Torrance,Cal...
    amyf,
    Did you verify the polarity of the new capacitors before and after installation?
    If one is reversed it could cause a problem too... don't ask me how I know.
     
  15. Hank

    Hank AC•FTW TCF Club

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    Boston, MA
    I know when I replaced all the caps in my parent's Series 3 HD Tivo, the one large 200v capacitor was unavailable from all sources, so I didn't replace it, but the unit powered up just fine. One year later, the PS died again, so I'm assuming that's the problem.

    The box is now no longer subscribed, so it's a door stop, really (no new subs allowed). But if anyone wants a Series 3 HD Tivo PS that needs just that one cap (I'm assuming, no promises), let me know.
     
  16. amyf

    amyf Member

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    Sep 24, 2014
    Central NJ
    Teeps likes this.
  17. Hank

    Hank AC•FTW TCF Club

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    May 31, 2000
    Boston, MA
    Woah... that's the exact same meter I had in the 70's growing up building electronic kits from Radio Shack. Wow.. that's a memory shocker.
     
  18. Teeps

    Teeps Well-Known Member

    1,888
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    Aug 16, 2001
    Torrance,Cal...
    Had to ask...
     
  19. timhbtr53

    timhbtr53 Grumpy Old Man

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    In the Deep...
    Go back to the basics. Did you check the fuse on the AC in? It's inline to the power plug has a black heat srink on it. Make sure your multi meter works in the Ohms mode "put the meter on the X1 touch the leeds together and see if the meter moves to 0" PLEASE MAKE SURE THE POWER CORD IS OUT OF THE ROOM touch one leed on one leg on the fuse and the other leed on the other side if you have meter movement it's not the fuse. If it is you have to unsolder it and replace it. I'm curious do you here a high pitch sound from the P/S? Oh make sure you check the batterys in that multi meter and hope they did not leak after 30 plus years. S3-HD-PS-2.jpg
     
    dianebrat likes this.
  20. timhbtr53

    timhbtr53 Grumpy Old Man

    310
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    Apr 24, 2014
    In the Deep...
    dianebrat and Hank like this.

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