LN40B500P3F No Power blown Fuse

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  • johns1mj
    Badcaps Veteran
    • May 2015
    • 242
    • United States
    #1

    LN40B500P3F No Power blown Fuse

    I have a similar problem to everyone else the fuse in location fm802s is blown. I read through several repairs on here. I did find the shopjimmy.com repair kit. Transistor (mosfet?) Qp801s and 802s tested good. The ones at location Qi820 and 821 failed. The small resistor at ub802 passed. The switching regulator at UM801s I wasn't sure how to test. There was no part number on UP801s. I did not test that one also. UI801 is a main chip, not sure how to test. Resistor RM805 tested good. Capacitor CI892 tested good.

    The first question is did I miss anything?

    So the second question is how to test the other components I couldn't.
    Attached Files
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    • dick_barton
      Badcaps Legend
      • Aug 2015
      • 6642
      • Wales
      #2
      Re: LN40B500P3F No Power blown Fuse

      Have you the schematic for the BN44-00264A to follow the repair through.
      QI874, QI811 are drivers to the blown mosfets so may be damages.

      UP801S is FAN7530
      UI801 is SEM2006
      Attached Files
      Last edited by dick_barton; 10-15-2016, 09:53 AM.
      Willing to help but I'm no expert.

        Comment

        • johns1mj
          Badcaps Veteran
          • May 2015
          • 242
          • United States
          #3
          Re: LN40B500P3F No Power blown Fuse

          No, I do not have the schematic.

            Comment

            • dick_barton
              Badcaps Legend
              • Aug 2015
              • 6642
              • Wales
              #4
              Re: LN40B500P3F No Power blown Fuse

              Here it is. It should help you in your repair.
              Attached Files
              Willing to help but I'm no expert.

                Comment

                • johns1mj
                  Badcaps Veteran
                  • May 2015
                  • 242
                  • United States
                  #5
                  Re: LN40B500P3F No Power blown Fuse

                  Thank you for all your help. The 2 mosfits fixed my problem.

                    Comment

                    • dick_barton
                      Badcaps Legend
                      • Aug 2015
                      • 6642
                      • Wales
                      #6
                      Re: LN40B500P3F No Power blown Fuse

                      That's good news.
                      Willing to help but I'm no expert.

                        Comment

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