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SCEPTRE U550CV no power, no response from switch

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    #1

    SCEPTRE U550CV no power, no response from switch

    I am getting no response from this TV when plugging it in. There's no standby light and the power switch doesn't appear to do anything. I am looking at Bud Martin's troubleshooting pdfs and I'm trying to locate the main fuse on the power supply board, but cannot find it. If anyone has any other ideas about what may be causing this, I could really use the help. Thanks.

    TV Info:
    Sceptre 4k UHD
    P/N: U550CV-UMC8A1IV58AA
    S/N: F43V550BKA1421
    Power Supply: 50325502000230 V1.0
    Attached Files
    Tags: None
    #2
    Re: SCEPTRE U550CV no power, no response from switch

    May be brown rectangle lower left. What dcv do you get across C17
    Last edited by dskall; 08-19-2017, 02:07 PM.
    I assume no responsibility for any stupid suggestions I might post.

    Comment

      #3
      Re: SCEPTRE U550CV no power, no response from switch

      113.1 uF

      EDIT: Misread your question. 0.0VDC on C17 and and 117VAC at plug
      Last edited by Downward_Spiral; 08-19-2017, 02:29 PM.

      Comment

        #4
        Re: SCEPTRE U550CV no power, no response from switch

        DC voltages to the logic board seem unsteady. The voltage goes up and down forever

        Comment

          #5
          Re: SCEPTRE U550CV no power, no response from switch

          the fuse is located below the coil label "LF3" . It have a brownish color. see picture red arrow
          Attached Files

          Comment

            #6
            Re: SCEPTRE U550CV no power, no response from switch

            Thanks. Fuse tests good, so it's not that.

            Comment

              #7
              Re: SCEPTRE U550CV no power, no response from switch

              disconnect main board and check if your stby voltage is stable.
              WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

              Comment

                #8
                Re: SCEPTRE U550CV no power, no response from switch

                It's not stable at all. It goes up and down in a cycle from ~0.1V to ~0.02V

                Comment

                  #9
                  Re: SCEPTRE U550CV no power, no response from switch

                  oops, missed that there was nothing on c17.

                  we will need pics of the bottom side of the board.
                  Last edited by attainteddragon; 08-19-2017, 05:53 PM.
                  WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                  Comment

                    #10
                    Re: SCEPTRE U550CV no power, no response from switch

                    Bottom
                    Attached Files

                    Comment

                      #11
                      Re: SCEPTRE U550CV no power, no response from switch

                      test the voltage on the bridge rectifier.

                      blue in dc, red in ac. this is the hot side, so care must be taken. do not touch anything with your hands.

                      check the yellow ic. it is probably just flux on it, but looks wrong in pic.



                      also a higher res pic would be good, and the ps part number. as someone may be able to find a schematic for it.
                      Attached Files
                      Last edited by attainteddragon; 08-19-2017, 06:24 PM.
                      WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                      Comment

                        #12
                        Re: SCEPTRE U550CV no power, no response from switch

                        Thanks for the help, everyone. I ended up just buying a new power supply from TVPartsGuy for about $50+shipping and it turned right on. Problem resolved.

                        Comment

                          #13
                          Re: SCEPTRE U550CV no power, no response from switch

                          For myself I would have tried replacing c17 being a capXon then if no change the diodes full check.

                          Comment

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