Insignia NS-40DR420NA16 no power

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  • dskall
    Badcaps Legend
    • Oct 2016
    • 2905
    • usa

    #21
    Re: Insignia NS-40DR420NA16 no power

    It's hard to believe you would get two bad power boards. Three if you count yours with something as obvious as bad standby voltage. I cannot think of anything else but bad power supply. Standby is pretty simple. It always needs to be there and steady when plugged in.
    I assume no responsibility for any stupid suggestions I might post.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #22
      Re: Insignia NS-40DR420NA16 no power

      May be he should ask the seller to check the 3.3V that he has to see they have stable 3.3V on his stock boards.
      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

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #23
        Re: Insignia NS-40DR420NA16 no power

        https://www.badcaps.net/forum/attach...8&d=1493049185

        Q202 looks to be switched power MOSFET for providing the switched 12V.
        U201 (P/N????) looks to be for buck converter to produce 3.3v
        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

        • Daveleone
          Badcaps Veteran
          • Apr 2016
          • 267
          • USA

          #24
          Re: Insignia NS-40DR420NA16 no power

          Before we move on...just to make sure I'm not being a complete idiot, I uploaded a video of me testing the 3.3v pin on CON2. Video shows power cord plugged in, CON2 connector, ground of voltmeter attached to chassis, voltmeter test lead plugged into the 3.3v pin of the cable coming from CON2, and fluctuating voltage reading on voltmeter (yes, I know my voltmeter is complete garbage, but it generally works for testing voltages ).

          https://tinyurl.com/mw3q3bu

          Let me know if I'm stupid. If not, I'm ready to start testing other components on the power supply.

          Comment

          • dskall
            Badcaps Legend
            • Oct 2016
            • 2905
            • usa

            #25
            Re: Insignia NS-40DR420NA16 no power

            Voltage looks to be cycling on and off. Maybe going into protection mode.
            I assume no responsibility for any stupid suggestions I might post.

            Comment

            • Daveleone
              Badcaps Veteran
              • Apr 2016
              • 267
              • USA

              #26
              Re: Insignia NS-40DR420NA16 no power

              Ok, rather than try to fix someone else's problem I'm going to return both of these (defective) power supplies to the seller. I'll buy one from another seller and give you guys an update. Stay tuned!

              Thanks again for all the help.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #27
                Re: Insignia NS-40DR420NA16 no power

                https://www.badcaps.net/forum/attach...4&d=1492990844

                Your original board: Did you check D208, 209, 210, another one close to those 3, and another one that is mounted in the heatsink at the bottom right of the board. Also check or replace the two startup/running caps C102, C10? at the bottom left corner of the power transformer T200.
                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

                • Daveleone
                  Badcaps Veteran
                  • Apr 2016
                  • 267
                  • USA

                  #28
                  Re: Insignia NS-40DR420NA16 no power

                  Update on this TV. I bought another replacement power supply off eBay, this time from electroparts_warehouse. Popped it in and the TV works great.

                  Thanks for the help and advice, everyone!

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #29
                    Re: Insignia NS-40DR420NA16 no power

                    Glad to hear that you finally get the good power supply. I would rate those people that sell boards and claimed that they are tested good rate those sellers as FALSE CLAIM.
                    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

                    • Daveleone
                      Badcaps Veteran
                      • Apr 2016
                      • 267
                      • USA

                      #30
                      Re: Insignia NS-40DR420NA16 no power

                      Originally posted by budm
                      Glad to hear that you finally get the good power supply. I would rate those people that sell boards and claimed that they are tested good rate those sellers as FALSE CLAIM.
                      Yeah, what I did was I rated them Positive and in my Feedback I said "Board didn't work, but seller refunded my money in full," because they did give promptly me back ALL my money, including the shipping. But at least this way if someone looks at their feedback they can see that the boards they supply don't always work as they said they do.

                      Comment

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