Replace PicoFuse with 20mm quickblow

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  • Qwertyco
    Member
    • Apr 2009
    • 18
    #1

    Replace PicoFuse with 20mm quickblow

    I can't locate a 240v 2a PicoFuse locally, can I replace it safely with a Maplins 20mm fuse holder and a glass 2a quickblow fuse?

    Why are PicoFuses used in the firt place?
    are they special, or just cheap?
    "Life is like a Dancing Monkey - Pretty amusing, until it starts to lob faeces at you"
    Tags: None
    • PlainBill
      Badcaps Legend
      • Feb 2009
      • 7034
      • USA
      #2
      Re: Replace PicoFuse with 20mm quickblow

      Originally posted by Qwertyco
      I can't locate a 240v 2a PicoFuse locally, can I replace it safely with a Maplins 20mm fuse holder and a glass 2a quickblow fuse?

      Why are PicoFuses used in the firt place?
      are they special, or just cheap?
      If force to substitute, I prefer to use a pigtail fuse. Using a fuse holder and fuse is also acceptable.

      A picofuse is used because it is small and easy to use in an automated assembly process. You want something to interrupt the circuit so a shorted transistor doesn't start a fire. Monitors aren't considered a user serviceable item, so a fuse holder isn't called for.

      PlainBill
      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

        Comment

        • Qwertyco
          Member
          • Apr 2009
          • 18
          #3
          Re: Replace PicoFuse with 20mm quickblow

          Originally posted by PlainBill
          If force to substitute, I prefer to use a pigtail fuse. Using a fuse holder and fuse is also acceptable.
          A picofuse is used because it is small and easy to use in an automated assembly process. You want something to interrupt the circuit so a shorted transistor doesn't start a fire. Monitors aren't considered a user serviceable item, so a fuse holder isn't called for.
          PlainBill
          Cheers Bill, that opens up a few options for me.
          a pack of 10 maplins fuses and a bit of soldering will get me away!

          Of course, I'll probably have to find out why it blew in the first place!
          "Life is like a Dancing Monkey - Pretty amusing, until it starts to lob faeces at you"

            Comment

            • PlainBill
              Badcaps Legend
              • Feb 2009
              • 7034
              • USA
              #4
              Re: Replace PicoFuse with 20mm quickblow

              Originally posted by Qwertyco
              Cheers Bill, that opens up a few options for me.
              a pack of 10 maplins fuses and a bit of soldering will get me away!

              Of course, I'll probably have to find out why it blew in the first place!
              Yes. And finding the responsible component by replacing the fuse with a length of 14 Ga wire is not a particularly safe way to do it!

              PlainBill
              For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

              Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                Comment

                • Qwertyco
                  Member
                  • Apr 2009
                  • 18
                  #5
                  Re: Replace PicoFuse with 20mm quickblow

                  Originally posted by PlainBill
                  Yes. And finding the responsible component by replacing the fuse with a length of 14 Ga wire is not a particularly safe way to do it!

                  PlainBill
                  If I did that, the component at fault would be the one that was burning - EASY!

                  Meanwhile, back on earth . . . . . I pigtailed a 1.6a fuse in place of the pico, pluged in, switched on, got a quick flash of backlights before the fuse blew again.
                  This is a Feb 2007 EMPREX LM-1905 19" Widescreen, Model No. LW1922c.
                  Where do I go from Here?
                  All I've fixed so far is 3 monitors with BadCaps, all with the help and inspiration from you guys!
                  I have a multimeter, a soldering iron, and the internet!
                  Do I need anything else?

                  Cheers,
                  Mike Q
                  "Life is like a Dancing Monkey - Pretty amusing, until it starts to lob faeces at you"

                    Comment

                    • PlainBill
                      Badcaps Legend
                      • Feb 2009
                      • 7034
                      • USA
                      #6
                      Re: Replace PicoFuse with 20mm quickblow

                      Originally posted by Qwertyco
                      If I did that, the component at fault would be the one that was burning - EASY!

                      Meanwhile, back on earth . . . . . I pigtailed a 1.6a fuse in place of the pico, pluged in, switched on, got a quick flash of backlights before the fuse blew again.
                      This is a Feb 2007 EMPREX LM-1905 19" Widescreen, Model No. LW1922c.
                      Where do I go from Here?
                      All I've fixed so far is 3 monitors with BadCaps, all with the help and inspiration from you guys!
                      I have a multimeter, a soldering iron, and the internet!
                      Do I need anything else?

                      Cheers,
                      Mike Q
                      Well, a digital camera, a good lighted magnifier, an ESR meter, and a ring tester (in that order) should be on the list.

                      On the Emprex, you're looking at a problem in the inverter section. Odds are a driver has shorted. What I recommend in this case is taking good pictures of bothe top and bottom of the power supply / inverter. Attach them to your next post, and someone should be able to identify the drivers. Then it's up to you to check them. Sometimes it is easy - it's the component with a hole blown in it.

                      PlainBill
                      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                        Comment

                        • Bobdee
                          Badcaps Veteran
                          • Jun 2008
                          • 461
                          #7
                          Re: Replace PicoFuse with 20mm quickblow

                          Originally posted by Qwertyco
                          If I did that, the component at fault would be the one that was burning - EASY!

                          Meanwhile, back on earth . . . . . I pigtailed a 1.6a fuse in place of the pico, pluged in, switched on, got a quick flash of backlights before the fuse blew again.
                          This is a Feb 2007 EMPREX LM-1905 19" Widescreen, Model No. LW1922c.
                          Where do I go from Here?
                          All I've fixed so far is 3 monitors with BadCaps, all with the help and inspiration from you guys!
                          I have a multimeter, a soldering iron, and the internet!
                          Do I need anything else?

                          Cheers,
                          Mike Q
                          This may help for after you find fault
                          http://cgi.ebay.co.uk/10-x-Axial-lea...item3ef7bcdf51
                          BTW 125V will do it
                          Bob
                          Last edited by Bobdee; 11-05-2009, 04:55 PM.

                            Comment

                            • Qwertyco
                              Member
                              • Apr 2009
                              • 18
                              #8
                              Re: Replace PicoFuse with 20mm quickblow

                              Originally posted by PlainBill
                              Well, a digital camera, a good lighted magnifier, an ESR meter, and a ring tester (in that order) should be on the list.
                              Sometimes it is easy - it's the component with a hole blown in it.
                              PlainBill
                              I don't have an ESR or a Ring tester.
                              No sign of any damage or scorch marks on any components!
                              I'll have another good look this weekend.
                              I have found that scanning things like this sometimes produces better pictures than a camera!
                              I'll get some picofuses bought, thanks Bob.
                              "Life is like a Dancing Monkey - Pretty amusing, until it starts to lob faeces at you"

                                Comment

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