dell E173Fpf burnt parts

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  • picturevalve
    Member
    • Nov 2010
    • 13

    #21
    Re: dell E173Fpf burnt parts

    Hi, my board has none of the damage suffered by the op. Just C868 and R852. It looks like R852 will be 0.21 ohm as the dell 2209wa monitor has just such a resistor in the ht as a fusible 1W resistor. In my board R856 is a 5.1 ohm not 15 ohm. Second jpg shows side of heatsink where C868 committed capricide.
    Attached Files
    Last edited by picturevalve; 04-18-2016, 10:03 AM.

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    • picturevalve
      Member
      • Nov 2010
      • 13

      #22
      Re: dell E173Fpf burnt parts

      Second image. I just wonder whether the "hot" side of the ceramic was touching the heatsink.
      Attached Files
      Last edited by picturevalve; 04-18-2016, 10:07 AM.

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      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #23
        Re: dell E173Fpf burnt parts

        Can I see the bottom side pf the board where C868 cap is to see how it is connected?
        Ceramic cap tends to fail as shorts circuit.
        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

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        • picturevalve
          Member
          • Nov 2010
          • 13

          #24
          Re: dell E173Fpf burnt parts

          C867 R852 and C868 form a pi filter on the ht supply so C868 is connected from R852 to ground. As C867 is 10nF 1kV, I suspect C868 is of the order of 22nF 1kV.
          Attached Files

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          • picturevalve
            Member
            • Nov 2010
            • 13

            #25
            Re: dell E173Fpf burnt parts

            The 2209WA monitor has a similar arrangement with a bead in the pi not the resistor.
            Attached Files

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            • picturevalve
              Member
              • Nov 2010
              • 13

              #26
              Re: dell E173Fpf burnt parts

              Replaced C867 and C868 with nice blue 10nF 1kV ceramics, the surviving C867 didn't look the part. Replaced R852 with a 0.22 ohm 1W fusible. All o/k.

              Comment

              • Davi.p
                Hobbist Tech
                • Sep 2009
                • 4318
                • Italy - Milan

                #27
                Re: dell E173Fpf burnt parts

                Hi, i have fixed one with same O.P. problem, lastly after 5 or more tries, 5 expensive mosfets dead and more, if you are interested on how email me..

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