fuse question

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  • Undead
    Senior Member
    • Mar 2012
    • 64
    • Canada

    #1

    fuse question

    When replacing fuses in monitor power supplies, should you use the slow-blow kind or the normal kind?
  • Alup
    Member
    • Dec 2011
    • 14

    #2
    Re: fuse question

    Originally posted by Undead
    When replacing fuses in monitor power supplies, should you use the slow-blow kind or the normal kind?
    what monitor and what fuse are you talking about? Alot of factors go into place.

    If its SMD then most of the time i see them as fast blow. If its the main fuse right after the power input then most of those are slow-blow. It just depends on the application.

    Comment

    • selldoor
      Slow Learner
      • Dec 2010
      • 7870

      #3
      Re: fuse question

      It often tells you on the board - there is a message saying use ONLY the same type of fuse?
      Please upload pictures using attachment function when ask for help on the repair
      http://www.badcaps.net/forum/showthread.php?t=39740

      Comment

      • Undead
        Senior Member
        • Mar 2012
        • 64
        • Canada

        #4
        Re: fuse question

        Yes it does say to use only the same type and rating of fuse but doesn't say what type it is (that I can see anyway).

        The monitor is an Acer X193W.

        The info right above the fuse (not visible in the picture) says

        4A/250V and it's identified as F301.
        Attached Files

        Comment

        • selldoor
          Slow Learner
          • Dec 2010
          • 7870

          #5
          Re: fuse question

          If you look on the metal shoulders on the fuse it might say more.
          What I am thinking is that if it is a slow blow it is usually described as a T4A 250v T= Time delay. Otherwise its a normal fuse - you should replace glass with glass ceramic with ceramic. (Not that I always do)
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

          Comment

          • Undead
            Senior Member
            • Mar 2012
            • 64
            • Canada

            #6
            Re: fuse question

            Yes there is definitely a T before the 4A. Had to remove it to read it.

            Ok so I will order several of the slow-blow ceramic 4A 250V fuses.

            Thank you both for the help

            Comment

            • selldoor
              Slow Learner
              • Dec 2010
              • 7870

              #7
              Re: fuse question

              If you are working on a board that repeatedly blow fuses put a filament light bulb
              across where the fuse would go. If this is a mains fuse use a 40 or 60 watt 240v bulb.
              If there is a short the bulb will light bright if not it will light then dim as the board powers up saving fuses.
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

              Comment

              • Undead
                Senior Member
                • Mar 2012
                • 64
                • Canada

                #8
                Re: fuse question

                Well I'm hoping that it won't repeatedly blow. I just got the monitor (was turned in for recycling) and after replacing the caps since there were bad ones, it was still dead. I checked the fuse and it was bad so I figure it won't hurt to get a few extras "just in case" since I have to place an order anyway.

                Comment

                • aqibi2000
                  Member
                  • May 2012
                  • 10
                  • England, UK

                  #9
                  Re: fuse question

                  Originally posted by selldoor
                  If you are working on a board that repeatedly blow fuses put a filament light bulb
                  across where the fuse would go. If this is a mains fuse use a 40 or 60 watt 240v bulb.
                  If there is a short the bulb will light bright if not it will light then dim as the board powers up saving fuses.
                  I've always wanted to try this but not sure if the bulb would withstand the current, and blow itself. Can you recommend a wattage for a 250v 8amp slow blow fuse thats been constantly tripping doing my nut in

                  Thanks

                  Comment

                  • selldoor
                    Slow Learner
                    • Dec 2010
                    • 7870

                    #10
                    Re: fuse question

                    aqibi2000 - here is a link with more info.
                    8Amps is quite hefty what are you working on? - Perhaps you need to start a thread? and ask for help.

                    http://www.ea8ay.com/fairbanks_morse...ts/dimbulb.htm
                    Please upload pictures using attachment function when ask for help on the repair
                    http://www.badcaps.net/forum/showthread.php?t=39740

                    Comment

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