UPS APC (640-0689b)

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  • Honziq
    Senior Member
    • May 2014
    • 58
    • Kazaksa
    #1

    UPS APC (640-0689b)

    Hello,
    this UPS is giving no power, just beeping.
    I look inside and see one transistor IRF2805 is blown up.
    I change transistor, but when i test the UPS transistor blows UP again.
    And second transistor is burning hot, but not shorted.
    Thanks.




    Attached Files
    Last edited by Honziq; 05-12-2014, 12:35 AM.
    Tags: None
    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31012
      • Albion
      #2
      Re: UPS APC (640-0689b)

      because something is shorted and drawing too much current.
      you need to check all diodes & stuff for shorts.
      also, check the battery(s) with the power off to see if they all have voltage.
      if one has no voltage it may be shorted out.

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