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Bad System Board?

Discussion in 'TiVo Help Center' started by Marconi, Dec 21, 2012.

  1. Marconi

    Marconi TiVo Junkie

    444
    0
    Sep 8, 2001
    Page, AZ USA
    I have a TCD652160 which, when I plug it in, the green power light on the front blinks about twice a second. This looks to me like a bad component on the system board that is shorted and causing the power supply to shut down.

    I swapped in a power supply from another TCD652160 and the behavior is the same. I also removed the CableCARD, unplugged all USB and network connections and even unplugged the drive. The behavior is the same.

    With the drive connected, I can hear it spin up but I can detect no seeking sounds. There is no video output via component video. The fan does not spin up.

    There are no signs of damaged/smoked components on the system board and no smoke smell, but I still suspect some component is shorted and shutting down the power supply.

    Since this is a Lifetime subscribed machine, I'd really like to get it going again.

    Thoughts?
     
  2. replaytv

    replaytv gun talk ignore list

    4,402
    0
    Feb 20, 2011
    Denver ish...
    Always suspect the hard drive before the mother board, and the power supply first. Replace it and see if works then . You'll have to go through the set up again and it will erase any TV shows on the replacement hard drive.
    TCD652160 are cheap on ebay or you might be able to get one on craigslist to get a hard drive off of. If you are good with computers you might be able to grab a spare hard drive that you have laying around and put the TiVo software on it and use it. I have never done that myself, but they talk about it a lot on this forum.
     
  3. Arcady

    Arcady Stargate Fan

    3,960
    0
    Oct 14, 2004
    Philadelphia...
    The TiVo HD should display something on the screen, even with a bad hard drive. (This is not the case with a Premiere.)

    What happens if you take the power supply and hard drive from the bad TiVo and use them with the known-good HD motherboard? If that boots up then you know your problem is the board in the suspect TiVo. You don't have to wipe the drive in order to test this.
     
  4. Marconi

    Marconi TiVo Junkie

    444
    0
    Sep 8, 2001
    Page, AZ USA
    No need to do that. As I noted, with the drive disconnected, I still have the blinking green light and no video out. The fan doesn't run. . A unit with NO drive (what I'm simulating by disconnecting) at least gives you a "Welcome, ..." screen and a steady green power light. And the fan would run. Since I've already ruled out the power supply by swapping in a known good one, it has to be something on the system board -- something that uses the same side of the power supply as does the fan.

    I suspect that I fried the HDMI circuit by unplugging the HDMI cable while it was turned on.
     
  5. Arcady

    Arcady Stargate Fan

    3,960
    0
    Oct 14, 2004
    Philadelphia...
    HDMI is hot-pluggable. I've seen a TiVo HD operate fine with a physically ripped off HDMI connector (using the component outputs.)
     
  6. steve614

    steve614 what ru lookin at?

    10,722
    0
    May 1, 2006
    Dallas, TX
    Looks like you've covered the basics.
    The only thing I can think of that you haven't mentioned:

    Have you tried booting up with the fan disconnected from the MB? Maybe the fan is shorted.
     
  7. unitron

    unitron Active Member

    16,387
    2
    Apr 28, 2006
    semi-coastal NC
    As long as you've got it opened, check the power supply capacitors for signs of bulging or leakage. The tops are supposed to be absolutely flat.

    Pull the battery and let the unit sit for a few hours, slip something non-conductive into the battery holder to hold the contacts apart.

    Then try booting to the Welcome screen over the composite video (yellow cable) with no hard drive attached.
     
  8. Marconi

    Marconi TiVo Junkie

    444
    0
    Sep 8, 2001
    Page, AZ USA
    Yes, tried that. I disconnected absolutely everything I could from the system board. Still had the blinky, green light.
     
  9. steve614

    steve614 what ru lookin at?

    10,722
    0
    May 1, 2006
    Dallas, TX
    Well, looking at an HDMI port, I can't see how you might have screwed something up by unplugging the HDMI cable with power connected.*

    [​IMG]


    *Unless... you might have inadvertently pulled the cable out at an angle with enough force that it compromised the solder connections on the MB.

    Another far fetched theory...

    Spend a few bucks and replace the MB backup battery.

    Other than that, I got nuthin'. :(
     
  10. Marconi

    Marconi TiVo Junkie

    444
    0
    Sep 8, 2001
    Page, AZ USA
    Theoretically, HDMI is hot pluggable, but the web is littered with anecdotal accounts of people frying one end or the other (sometimes both) of their HDMI connections by plugging/unplugging hot.
     
  11. Arcady

    Arcady Stargate Fan

    3,960
    0
    Oct 14, 2004
    Philadelphia...
    There is 5V DC in there, but it would take a lot to short that pin.
     
  12. Marconi

    Marconi TiVo Junkie

    444
    0
    Sep 8, 2001
    Page, AZ USA
    I had never seen the blinking green power light problem before this THD failed and now I've seen it twice.

    Another of my THDs was a bit sluggish and I ran Kickstart 57 on it, following which, when it tried to start up, the power light blinked just like the earlier one. The only thing these two THDs had in common was the TV to which each was connected -- a 19" Vizio. I unplugged the blinker and tried booting again and it started and is running normally. Whew!

    Apparently, there is more than one condition that can cause the blinking green power light condition.
     
  13. unitron

    unitron Active Member

    16,387
    2
    Apr 28, 2006
    semi-coastal NC
    Were both connected to that TV via HDMI?
     
  14. Marconi

    Marconi TiVo Junkie

    444
    0
    Sep 8, 2001
    Page, AZ USA
    Yes.
     
  15. unitron

    unitron Active Member

    16,387
    2
    Apr 28, 2006
    semi-coastal NC
    Have you tested that same HDMI input on the TV with some other known good piece of source equipment?
     
  16. rkshack

    rkshack New Member

    93
    0
    May 6, 2002
    Was an answer ever figured out? I just started having the same problem with my TiVo hd.

    Rkshack
     
  17. caughey

    caughey Member

    275
    0
    May 26, 2007
    Orange County
    I woke up this morning to a blinking green light on my TiVo HD and no video. A reboot has fixed it for now at least, but I haven't found a definitive answer as to what this means.

    Any ideas? Is this a subliminal message from TiVo that I need to buy a Roamio?
     
  18. lessd

    lessd Active Member

    7,695
    5
    Jan 23, 2005
    CT
    It is part of TiVos new update program, special software is sent to select customers to test out how annoying they can make your older TiVo before you give up and upgrade to the Roamio :D
     
  19. caughey

    caughey Member

    275
    0
    May 26, 2007
    Orange County
    So far, so good. I haven't had any more problems with the flashing green light.

    My TiVo did reboot for no apparent reason this morning, and I suspect it's occasionally been rebooting behind my back. Is there a way to check how long it's been since the last reboot?
     
  20. lessd

    lessd Active Member

    7,695
    5
    Jan 23, 2005
    CT
    If you have a cable card or MoCA there is an uptime counter, I also think each channel your TiVo is tuned to has an uptime counter.
     

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