Replace a TNY255G with a TNY255GN in an APC BE725BB UPS

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  • MrCreosote
    Member
    • Dec 2005
    • 31
    #1

    Replace a TNY255G with a TNY255GN in an APC BE725BB UPS

    The UPS appears to be working properly but it is not float charging the battery. It was in service for about a day and then started beeping that battery capacity was low. I removed the battery and it was just over 9v. I connected everything and measured no change in bat voltage so it was not charging.​

    UPS had worked fine, after years, battery needed replacement. Installed battery and then:

    IC blew up with I got a strong arc at the wall outlet when I plugged in - I didn't' realize the unit was switched ON. Possible contributor might be I had an overcharged new 12v battery installed that was just over 15v (thank you Harbor Freight). I'm also concerned that there may be more carnage.


    I got lucky and found the blown off part so I could read the part number. Here are some pics.

    I'm thinking: replace IC and hope.... (maybe power up unit in series w/100w light bulb??? - I also have a nice Variac)
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    • R_J
      Badcaps Legend
      • Jun 2012
      • 9515
      • Canada
      #2
      The N means lead finish is lead free
      Attached Files

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        • MrCreosote
          Member
          • Dec 2005
          • 31
          #3
          Originally posted by R_J
          The N means lead finish is lead free
          Thanks, I just learned something !
          NOTE: I do all my work with old lead solder.

            Comment

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