Constant fuse blowing

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  • Techboxcomputer
    Senior Member
    • Aug 2016
    • 61
    • USA

    #21
    Re: Constant fuse blowing

    OK, I am going to do that on this group of 3. I tested the other groups of mosfets in circuit and they all had very like readings.The group of 4 all measured about 481 the group of 2 measured 284.
    Also, I watched a video on how to test the bridge rectifier in Diode mode (https://www.youtube.com/watch?v=dqkT6hF0O3E) it shows that I should be getting no measurement on most if not all pins. I get a measurement on every pin.
    I will pull the mosfets and post back the results.

    Thanks

    Comment

    • Techboxcomputer
      Senior Member
      • Aug 2016
      • 61
      • USA

      #22
      Re: Constant fuse blowing

      test results with mosfets out

      Left - 0.0
      Middle - 0.0
      Right - OL on the cheap multimeter, no read on upper end meter
      Left and right chip are a Magnachip 60R360P
      Middle chip is auk ck617 sf10a600HPI

      Thanks

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #23
        Re: Constant fuse blowing

        Show us pictures how you orient the body of the MOSFET to count those pins.
        So far it looks like it is shorted.
        You should look up the spec sheet so you will know what pin is for each leg: Source, Drain, and Gate.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • Techboxcomputer
          Senior Member
          • Aug 2016
          • 61
          • USA

          #24
          Re: Constant fuse blowing

          If I am right on the two of them it goes source, drain and gate from right to left.
          But this page has 2 pictures that seem to conflict each other on that

          http://www.datasheet4u.com/datasheet....php?id=951127

          I still havn't found the AUK one yet. I will post 3 pictures the afternoon.

          Thanks

          Comment

          • vinceroger69
            Badcaps Legend
            • Mar 2012
            • 6714
            • uk

            #25
            Re: Constant fuse blowing

            The auk device maybe this

            Comment

            • ivtec
              Badcaps Legend
              • Dec 2008
              • 1967
              • USA

              #26
              Re: Constant fuse blowing

              Originally posted by Techboxcomputer
              test results with mosfets out

              Left - 0.0
              Middle - 0.0
              Right - OL on the cheap multimeter, no read on upper end meter
              Left and right chip are a Magnachip 60R360P
              Middle chip is auk ck617 sf10a600HPI

              Thanks
              https://www.youtube.com/watch?v=Yj3yM9VJc74

              Comment

              • Techboxcomputer
                Senior Member
                • Aug 2016
                • 61
                • USA

                #27
                Re: Constant fuse blowing

                Here is the pictures of the tests, hope it helps
                Attached Files

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #28
                  Re: Constant fuse blowing

                  https://www.badcaps.net/forum/attach...6&d=1510069112
                  The two devices (MAGNA) on the outside are MOSFET, the middle one (Dual-diode Common Cathode) is the PFC diode.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                  Comment

                  • Techboxcomputer
                    Senior Member
                    • Aug 2016
                    • 61
                    • USA

                    #29
                    Re: Constant fuse blowing

                    Thanks! That is the one that looked to me to have possibly heat damage to the board. Now, is there another test I need to do since this is not a mosfet but it's a diode. Or do I need to move to another part of the board?

                    Thanks again

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #30
                      Re: Constant fuse blowing

                      So the two MOSFETs tested BAD per your pictures per post 27, so the PFC IC may be damaged also. I would replace both MOSFETs and the IC at the same time.
                      The dual diode should test like two diodes, Cathode is the middle pin.
                      Last edited by budm; 11-10-2017, 03:15 PM.
                      Never stop learning
                      Basic LCD TV and Monitor troubleshooting guides.
                      http://www.badcaps.net/forum/showthr...956#post305956

                      Voltage Regulator (LDO) testing:
                      http://www.badcaps.net/forum/showthr...999#post300999

                      Inverter testing using old CFL:
                      http://www.badcaps.net/forum/showthr...er+testing+cfl

                      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                      http://s807.photobucket.com/user/budm/library/

                      TV Factory reset codes listing:
                      http://www.badcaps.net/forum/showthread.php?t=24809

                      Comment

                      • petehall347
                        Badcaps Legend
                        • Jan 2015
                        • 4426
                        • United Kingdom

                        #31
                        Re: Constant fuse blowing

                        put black lead to centre pin .red to others .. 600mv or so its maybe good .

                        Comment

                        • Techboxcomputer
                          Senior Member
                          • Aug 2016
                          • 61
                          • USA

                          #32
                          Re: Constant fuse blowing

                          OK, I am back sorry for the delay, but I own a computer repair shop and had a lot of catchup to do. So from what I am reading, I need the both mosfets and the PFC in the middle. I have ordered from Digikey in the past for these type of things and would like to again if possible. I should be able to hunt down the mosfets I believe because the make/model is quite clear on them. As far as the PFC I am still unclear. I know I will need another ceramic fuse also and a slo-blo has been suggested to me but I am going with all I read on here.

                          Thanks again

                          Comment

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