HanNspree HSG1066 repair

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA
    #1

    HanNspree HSG1066 repair

    Symptom:No inidcator, no 5v or 16V
    Cuases: Blow fusible resistor R808 0.2 Ohm in the Primary side for B+ feeding the SMPS IC due to shorted out snubber cap C809 100pF 1000V (connected between the Source and Drain of the power MOSFET).
    Attached Files

    if you find these attachements useful please consider making a small donation to the site

    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
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: HanNspree HSG1066 repair

      More pictures.
      Attached Files

      if you find these attachements useful please consider making a small donation to the site

      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

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: HanNspree HSG1066 repair

          Nice fix. Strange to see disc ceramic fail, they tend to be quite reliable. Perhaps the design exposes it to over 1kV on some of the switching points, or the part is not rated for 1kV continuously.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • ben7
              Capaholic
              • Jan 2011
              • 4059
              • USA
              #4
              Re: HanNspree HSG1066 repair

              Originally posted by tom66
              Nice fix. Strange to see disc ceramic fail, they tend to be quite reliable. Perhaps the design exposes it to over 1kV on some of the switching points, or the part is not rated for 1kV continuously.
              Indeed that is a bit worrying, the highest MOSFET D-S breakdown voltage I can recall is 900v.
              Muh-soggy-knee

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: HanNspree HSG1066 repair

                  MOSFETs are commercially available up to 3kV breakdown voltages, but you will not see it in consumer gear. I have seen 900V rated FET in flyback converter once.
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment

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