Vu + duo stuck on booting logo

Discussion in 'VuPlus Duo Hardware troubles and Repair support.' started by Lukasz, Sep 6, 2021.

  1. Lukasz

    Lukasz New Member

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    Hi
    I've got problem with my VU+ Duo. It is stopping on booting screen. I have tried reflashing with few different images(bh vti vix) but every time same problem. Have tried to dissconect hdd, different usb stick, upgrade boot loader, new capasitors still no joy. I think that probably flash memory is faulty. What do you think about it? . If I will change that flash do I need to programming that, before I will solder to main board or I can do this by usb after as with normal image?
    Cheers
     
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    To use the correct boot loader you, an I need to know if you have a original motherboard, or a clone.
    better is to show a picture of the motherboard you have.
     
  3. Lukasz

    Lukasz New Member

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    That is mu motherboard
     

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  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    This is a original motherboard.
    Okay, since it has still the old C807 cap, I think that that could be the reason.
    Replace it for a new one, better is to change it to a 330uF cap or at least a bit higher than it now has.

    See this picture..
    [​IMG]

    There are two ways for replacement the cap,
    one is to remove the motherboard to remove the old etc, but that may create other issues due the age of the motherboard.
    other is not removing the board, and cut the old cap, and solder the new one to it.
     
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  5. Lukasz

    Lukasz New Member

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    I have already replaced them c807, 814 and 850 still same. On box screen I have got : Vu + Duo, on tv screen booting logo of image.
     

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  6. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    When you have replace the cap, and have change it to a 330uF or a it higher as 480uF, then I assume that that will not be the case.
    In that case it could be a bad nand flash chip, but that's never to say it will.
    The only way to know it for sure is to replace it, or by doubts measure the eight I/O pins, they should be all in the same Ohms range by measure them between a ground spot and a I/O pin.
    When one, or more are different, it may indicate a bad nand chip, or a bad connection between the nand chip to or from the cpu.
    Sometimes due a bad solder, sometimes it it caused by the cpu as due a bad solder ball.
    The ohm values indicates the value from the cpu, and the nand flash chip, thus when one is different it could be caused from one of the two.
    See the datasheet from it to see the I/O pin-outs.

    Your question..
    "I think that probably flash memory is faulty. What do you think about it? . If I will change that flash do I need to programming that, before I will solder to main board or I can do this by usb after as with normal image?"

    When you replace the nand hip for a new one, you need to upload the boot loader by the jtag/I2C method before you will be able to upload a image file by usb.
    Other option is to use a pre-programmed chip, made with a nand flash chip programmer.
    But that is more expensive than buying a new chip and the cypress jtag/I2C board.

    But still, I can not say it is caused due the nand flash chip because it may also be cause due the cpu when it's not related to other things as the use of a wrong bootloader, or other software issues.
    Best for testing or using is to use openpli, in some cases a old version may make a difference.
    Older versions uses less nand flash chip space than the newer.
     
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