Please could someone help me with this UNiFi LR AP board repair

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  • roxboy1984
    Senior Member
    • Jan 2022
    • 179
    • South Africa
    #1

    Please could someone help me with this UNiFi LR AP board repair

    Hi guys,

    So I have a Unifi LR AP one of the older ones. And I accidentally connected it to the POE port on my mini UPS while it was in 24V mode and it must have fried something. Attached is a pic of the board, when I connect it to the PoE injector the one diode I’ve circled gets very hot, is this likely the issue and I just need to replace this diode or would something else have blown from the overload? Thanks for the help.
    Attached Files

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    Tags: None
    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31288
      • Albion
      #2
      what does the diode say on it?

        Comment

        • lotas
          Badcaps Legend
          • Jan 2016
          • 4861
          • Russia
          #3
          TVS Diode (Suppresor).

            Comment

            • petehall347
              Badcaps Legend
              • Jan 2015
              • 4450
              • United Kingdom
              #4
              remove dead diode then see if board shorted

                Comment

                • Agent24
                  I see dead caps
                  • Oct 2007
                  • 5095
                  • New Zealand
                  #5
                  Originally posted by petehall347
                  remove dead diode then see if board shorted
                  This - it's quite possible the diode failed short and prevented the voltage from damaging the rest of the circuit, hopefully anyway.
                  If that is the case you should replace the diode for continued protection...
                  "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                  -David VanHorn

                    Comment

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