Dream Multimedia error

Discussion in 'DM800HD Hardware troubles and Repair support.' started by ahmed basher, Feb 19, 2016.

  1. ahmed basher

    ahmed basher New Member

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    I Try this way with Mr yassinov and same thing happened so I think I will send it for you and I will pm you for address
     
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Okay, email sent.
     
  3. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Status so far about this issue...

    Meanwhile I have done some research on this motherboard, but so far without success.
    A higher bootloader as ssl84 is not the problem.
    It just will not work on an image file higher than ssl79 and it doesn't matter if I use original image files or japhar, or ferrari.
    Tested with sims and software, 2.01/2.10 and ferrari/Japhar Nc3.
    It just loads the bootloader, and gets stuck on the beginning of the image file.
    This motherboard works flawless on a #79 image file, or older.

    But despite that I could measure any errors, I decided to replace some parts.
    And so replaced the..
    Simcard switch transistors Q8/Q9 and the U16,
    Modified the U18 with the resistor,
    Bios rom replaced,
    All crystals replaced,
    And even replaced the Nand flash chip.

    But still, no improvement, very odd and interesting case which I have never have seen before.
     
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  4. dmd

    dmd New Member

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    Hi Johnny B my old dm800 broken when power off and now get LCD error.
    You think software is foulty ?
     
  5. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    When you only have the Error on display, than it means basically that it sees no sim card, same message as if it's not present/removed.
    If that is so, than a best start may to check the 5v to it and when it drops, remove/clean and replace the sim card.
    Or, try first other things as remove the tuner and check if it than want to start.
     
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  6. dmd

    dmd New Member

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    Hi

    I try clean pads and simcard no good still error and remove tuner this same get error.
    Maybe simcard is broken ?
    This problem see when normal i power off box next start get error.
    Try diffrent power supply no good.

    Br Johnny.
     
  7. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    It could indeed be a broken simcard, often to measure when you measure the pin.
    Iif it's get the 5v, when it's delivered when powering up, but eventually drops to lower than 5v than the sim may not work.
    Same behavior as if there is no simcard in it.

    If you have no 5v to this pin 1 when powering up the box, then it may be a hardware issue.
    More about this see this picture,
    [​IMG]
    Left row is when it's working, right row when it's not working when there is a simcard added, same results as if there is no sim card.

    More about the sim issues, see this simcard issues topic,
    And other idea is to give me a picture of the parts side, to see if it may related to some bad caps.
    In any case, when one of the four big caps are leaking, then it could give also startup issues.

    And another idea is (when you have it) to test the sim into another dm800hd box, or with a card reader.
    Or, sent the sim card to me by post, then I will check it.
     
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