bios dm500hd solved

Discussion in 'Hardware troubles and Repair support.' started by manias21, Jun 26, 2017.

  1. manias21

    manias21 New Member

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    change of plans,
    Managed reflash bios,
    And the problem persists,
    When I restart the dream, the center LED does not turn on and the other four do.

    I disconnect 12v, 10 seconds, I connect 12v, it works.
    When I restart, sometimes it does not.

    solution?? ( Error known as k6 )


    Thank you very much for your support.
    ( I attach my readings )
    [​IMG]
    [​IMG]
    [​IMG]
     

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    Last edited: Jun 26, 2017
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Seems to me a bad cap issue, maybe the C1407 (mb parts side/right side under the tuner module) or other caps.
     
  3. manias21

    manias21 New Member

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    C1422 and c1407 changed.
    Continue with the problem.
    What else should I change?
    ( Change all the under the tuner? )
     
  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Can't say, and those caps are difficult to reach.

    But since you have it about the K6 error which it sometimes gives..
    Than it seems to me most likely that you must search it on the memory voltages circuit which is the LT1580.
    Maybe the regulator but that happens rare, maybe the ddr termination regulator which were in my cases two times the case from the manny dm500hd boards that I had in repair.
    A cap issue seems to me more likely, but can't say it for sure because it is not so a easy error you have.
    In any case, caps as the yello cap C1122 and ceramic caps as the C1153 you could remove to see if it gives any change.
    Of course one by one, so remove one, check the issue, and place it back, then try another until the issue gets worse, or less worse.

    Another thing you could do is to check this voltages circuit when it's restarting, see if this voltage stays stable.
    Anyways more about this, see this topic.
    But still, it doesn't have to be a voltage issue from the memory chips, it may also be caused due another cause.
     
  5. manias21

    manias21 New Member

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    mmmm.....

    P1100

    5 - 5v -----> 664Ω
    4 - 3,3v -----> 593Ω
    3 - 2,4v -----> 9k to 10kΩ
    2 - 1,8v -----> 0Ω
    1 - 1,1v ----->310Ω

    Only point 1 makes me doubt.
    what do you think?
     
  6. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Ohms measurements notes I only have in my work shop, so tomorrow I could check this.
    But some, at least one as the 1.8v seems to have a circuit interruption because as far as I see it it should be something as 30 ohm.
    Or your measurements device is not accurate.
    Nevertheless, Monday I be able to check this.
     
  7. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Yours...
    5 - 5v -----> 664Ω
    4 - 3,3v -----> 593Ω
    3 - 2,4v -----> 9k to 10kΩ
    2 - 1,8v -----> 0Ω
    1 - 1,1v ----->310Ω

    Mine..
    5 - 5v -----> 1923Ω
    4 - 3,3v -----> 1036Ω
    3 - 2,4v -----> 2806Ω (slow up to..)
    2 - 1,8v -----> 27.6Ω
    1 - 1,1v ----->289Ω (up/down to..)

    So just as expected your 1.8v ohm value is incorrect.
    If, it is really this value/ and so, it gives no value than you should check the inductors and other parts on this circuit for a interruption.
    It's the voltages for the memory as you can see on the image. that I previously has given.

    But if you mean, it's a shorted value, then it could be some cap on this circuit as the C1122 yellow cap.
     
  8. manias21

    manias21 New Member

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    What are the values of the yellow Cxxxx?
    I change the four ...
     
  9. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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  10. manias21

    manias21 New Member

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    I changed all 227a and the same thing is still happening.
    Can I send it to you and see you?
     
    Last edited: Jul 9, 2017
  11. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    That is possible, just give me a private message for more info, however if it's a cpu issue or memory chips issue then I do not repair them anymore due the age and prices of the new dm520/525HD boxes.