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Umultilink VDD and ground short issue
huaping t. Jun 16, 2015 at 07:38 AM (07:38 hours)
Staff: Johnny N.

  • we are using U-multilink to debug S08PA4, but now failed to connect it, and find 6 pin BDM, pin2 (ground) and pin6 (VDD) is short? Do you have any ieda to repair this tooling? As I remember that old mutilinkBDM can repair by remove one diode near 6 pins BDM, but in U-multilink, it is not found. Anyone can help me?
    Thanks!




    Comments

    • Hi Huaping,

      Which multilink do you have exactly?

      Regards,
      Johnny
      P&E

      • Hi:
        my tooling is USB Multilink Universal, is there any way to repair it by myself? Port C BDM, VDD and ground are short.
        Thanks a lot!

        Best regards

        Huaping

        • Hi Huaping,

          Which revision of the USB Multilink Universal?

          -Johnny

  • Hi, Johnny:
    Rev B.
    Thanks!

    Huaping

    • Hi Huaping,

      The diode on T3 which connects across VDD and GND is probably damaged.

      Zener Diode 5.6 Fairchild 1N752A_T50R or 1N5232B

      -Johnny

  • Dear Johnny:
    we remove T3, but VDD and GND is still short, is there any other way?
    Thanks!

    Huaping

    • Hi Huaping,

      This indicates that some ICS on the PCB were also damaged. Do you see cracks or thermal damage on any other components? Is the PCB getting very hot anywhere?


      Regards,
      Johnny
      P&E

      • Hello Huaping,

        Do you have any additional information?

        -Johnny
        P&E

  • Dear Johnny:
    Sorry for delay!
    we found U14, U9,U10 is very hot. are they damaged?
    Thanks!

    Huaping

    • Hi Huaping,

      U9, U10, and U14 are the buffers that interface directly with the target so they can be damaged by too much voltage or current from the target. I would remove each component one at a time and check if VDD is still shorted to GND.

      -Johnny
      P&E

      • Hi, Johnny:
        Yes! it seems U9, U10, and U14 are damaged, but we can find the real part number for this buffer? Can you help us for this replacement?
        Thanks a lot!


        Best Regards
        Huaping

        • U9, U10, and U14 is TI SN74LVC2G126DCTR

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