choosing right laptop fuse

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  • fabiog
    Senior Member
    • Jul 2011
    • 102
    #1

    choosing right laptop fuse

    Hello
    I have a fujitsu esprimo V5535 with what seems to be blown fuse (multimeter gets out of range error on both ohms and continuity test).
    It has this fuse:
    http://search.digikey.com/us/en/prod...87TR-ND/700828
    5a 125v SMD.
    I have an older Acer board with a different fuse 6.5a 32v:
    http://parts.digikey.com/1/parts/697...16ff6-5-r.html
    Would this even work or be just plain unsafe?

    Thanks for any comments.
    Tags: None
    • fabiog
      Senior Member
      • Jul 2011
      • 102
      #2
      Re: choosing right laptop fuse

      I also have a spare 10A 125v :
      http://search.digikey.com/us/en/prod...91TR-ND/700832

        Comment

        • selldoor
          Slow Learner
          • Dec 2010
          • 7870
          #3
          Re: choosing right laptop fuse

          Voltage as long as it is rated for more than where it is used does not matter the amperage is the crucial thing.

          Are you testing off the board? or at least one end lifted
          Last edited by selldoor; 05-15-2012, 12:51 PM.
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

            • fabiog
              Senior Member
              • Jul 2011
              • 102
              #4
              Re: choosing right laptop fuse

              Tested on and off the board and get out of range ,laptop has another fuse by battery connector 7A and that tests fine.

              On page 29 of the schematic the fuse is by the DC jack and it is labelled F1.
              Attached Files

                Comment

                • 999999999
                  Badcaps Veteran
                  • Sep 2006
                  • 774
                  • USA
                  #5
                  Re: choosing right laptop fuse

                  I am doubting that a blown fuse is the only problem, probably some other fault caused it to blow. I would not use a 10A fuse there, except that if there is some other fault bad enough that it would cause you to scrap the laptop, then it would be nice to avoid the extra expense of buying more parts for it, so what I would do is pull out all components non-essential to get it to post and access bios menus (no HDD, only one memory module, etc, to decrease chances something you can unplug is the fault point), then solder in the 10A fuse you already have and see if the laptop works.

                  If it works, then I'd add back the removed components to see if it still worked and if it does, THEN I'd order the right value fuse for it. I would not desolder a fuse off another board to use, repetitive thermal cycling of surface mount fuses can compromise them and lower their current capability.

                    Comment

                    • fabiog
                      Senior Member
                      • Jul 2011
                      • 102
                      #6
                      Re: choosing right laptop fuse

                      I tried the 10a fuse and it's working fine ,the laptops owner has a universal power adapter and the tip was slightly loose and not connected correctly to the adapter and I suppose that's why the fuse blew.
                      Now I have to order the 5a fuse ,

                      Thanks for the help.

                        Comment

                        • selldoor
                          Slow Learner
                          • Dec 2010
                          • 7870
                          #7
                          Re: choosing right laptop fuse

                          Great news - please can you update your profile with at least country and mains voltage.
                          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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