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Only the bottom Left LED

Discussion in 'TiVo Series3 HDTV DVRs' started by sknaf, Jan 2, 2013.

  1. Jan 2, 2013 #1 of 16
    sknaf

    sknaf New Member

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    I have 2 S3 (oled 648250B), one works, one not; both have lifetime.
    I tried swapping the HD and PS, still only the single LED.
    [​IMG]

    So guessing it's the last part, the motherboard.
    Unless someone else has any other ideas ??

    If I buy a ebay/craigslist S3 to swap parts can I retain my lifetime ?

    TIA ...

    ~Knaf
     
  2. Jan 2, 2013 #2 of 16
    Arcady

    Arcady Stargate Fan

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    Lifetime is tied to the crypto chip on the motherboard. If you replace the motherboard, you will lose the lifetime service, unless you desolder the chip and move it to the replacement motherboard.
     
  3. Jan 2, 2013 #3 of 16
    ThAbtO

    ThAbtO TiVoholic by the bay

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    Have you considered that the front panel may be at fault?
     
  4. Jan 2, 2013 #4 of 16
    sknaf

    sknaf New Member

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    Nov 28, 2005
    Milwaukee, WI
    @ThAbtO: Good point, I should have also mentioned nothing comes up on TV.

    @Arcady: I can do soldering. Which one is the crypto chip ?

     
  5. Jan 3, 2013 #5 of 16
    steve614

    steve614 what ru lookin at?

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    Where's lrhorer when you need him? :D
     
  6. Jan 3, 2013 #6 of 16
    Blahman

    Blahman New Member

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    Mar 3, 2002
  7. Jan 3, 2013 #7 of 16
    bikegeek

    bikegeek Member

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  8. Jan 3, 2013 #8 of 16
    HerronScott

    HerronScott Active Member

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    He did say that he swapped power supplies and hard drives with his working one so seems unlikely that a power supply working in one would not work on the other even if it had marginal capacitors but he should check just in any case.

    Scott
     
  9. Jan 3, 2013 #9 of 16
    Arcady

    Arcady Stargate Fan

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    Hmm, I know the S3 OLED and earlier had the TSN on the crypto chip, but where is it stored in newer boxes? It has to be somewhere, right?
     
  10. sknaf

    sknaf New Member

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    Nov 28, 2005
    Milwaukee, WI
    @Blahman: This is the one you are talking about - u6, correct ?
    [​IMG]

    ~Knaf
     
  11. dianebrat

    dianebrat I refuse to accept your reality TCF Club

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    nope, it's U16, notice the part number matches what he posted..
     
  12. Blahman

    Blahman New Member

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    @Arcady, Starting with the TCD652160 (Series 3 HD) and beyond the TSN is on die of the CPU. Before that the TSN was stored in a separate atmel chip, depending on if it was an S1, S2, DTiVo, Or S3 OLED 9TCD648250B) the chip will either be part AT90SC3232C or AT90SC6464C. Series 3 HD, HDXL, and Series 4 (Premiere) all have the TSN on die of CPU.

    @sknaf, As dianebrat already pointed out, U16 is the AT90SC6464C that holds the TSN. U6 is the prom chip which I mentioned it being near.
     
  13. Arcady

    Arcady Stargate Fan

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    So, could the CPU be moved to a new board? I'm not sure how it as attached, probably a BGA or some other evil thing. Might be easier to move new components to a failed board in that case. Would it really destroy TiVo's business model to put the chip in a socket?
     
  14. Blahman

    Blahman New Member

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    Mar 3, 2002
    Arcady, yes, if you can find someone with the proper equipment to remove, reball, and set BGA components you could in theory move the CPU to a new motherboard. It would be similar to what some people do for repairing Xbox 360s when they wanted to preserve a CPU for which the key was known (before other hacks made the value there drop dramatically). As to socketing the chip, I don't think they've ever had the atmel socketed (I know on some the prom was). That is the gamble taken with lifetime, that the unit can be kept going longer than the benefit of lifetime. The systems where the TSN was in a separate chip just made that process a bit easier. Newer systems with the TSN on die of the CPU just make things harder to maintain for long life cycles.

    Although, it has been a long time since I tried, it used to be that is you swapped on the web page the TSN of the same exact model (example TCD652160 for TCD652160) it would move the lifetime. I've not had to do that in a while as I've been happily keeping my S3s going and have recently invested in a few parts systems to have on hand for potential failures.
     
  15. unitron

    unitron Active Member

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    I can do soldering as well, I've been at it for about a half a century now.

    But moving a crypto chip is closer to surgery, in that you need special equipment and should practice on something dead and disposable first and only do it as a last resort.

    If you have to do it, I can advise you on how, but let's try everything else first.

    What happens on screen, via the yellow composite video cable, when you plug the "bad" unit into the wall socket?
     
  16. videobruce

    videobruce OTA is still alive

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    Buffalo NY
    ^+1^
    Rodger on the surgery. :(
     

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