SCEPTRE U550CV no power, no response from switch

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Downward_Spiral
    Member
    • Jul 2012
    • 37
    • USA

    #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
  • dskall
    Badcaps Legend
    • Oct 2016
    • 2905
    • usa

    #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

    • Downward_Spiral
      Member
      • Jul 2012
      • 37
      • USA

      #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

      • Downward_Spiral
        Member
        • Jul 2012
        • 37
        • USA

        #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

        • ecking767
          Badcaps Veteran
          • Oct 2009
          • 492
          • USA

          #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

          • Downward_Spiral
            Member
            • Jul 2012
            • 37
            • USA

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

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

            Comment

            • attainteddragon
              Badcaps Veteran
              • Apr 2013
              • 764
              • australia

              #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

              • Downward_Spiral
                Member
                • Jul 2012
                • 37
                • USA

                #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

                • attainteddragon
                  Badcaps Veteran
                  • Apr 2013
                  • 764
                  • australia

                  #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

                  • Downward_Spiral
                    Member
                    • Jul 2012
                    • 37
                    • USA

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

                    Bottom
                    Attached Files

                    Comment

                    • attainteddragon
                      Badcaps Veteran
                      • Apr 2013
                      • 764
                      • australia

                      #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

                      • Downward_Spiral
                        Member
                        • Jul 2012
                        • 37
                        • USA

                        #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

                        • maxvalutech
                          Badcaps Veteran
                          • Dec 2014
                          • 804
                          • australia

                          #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

                          Related Topics

                          Collapse

                          • Tynan Dill
                            Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                            by Tynan Dill
                            I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                            Upon bringing it home and plugging it up, it showed a standby light.

                            I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                            The screen seems to blackout and stay black, but with a flashlight I can see the display.

                            With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                            Assuming...
                            11-22-2024, 01:46 PM
                          • Powderfanupnorf
                            Dell AL440LX power on switch circuit help required
                            by Powderfanupnorf
                            Hi Everyone. First official post so fingers crossed I conform and also manage to get photos to work.

                            So I am requesting some help from anyone who happens to have one of these motherboards to hand and perhaps a multimeter.

                            My board has a single row of header pins for all the front panel stuff (have seen others where they are grouped together differently so thats no help) and the two pins for the power on switch had been previously repaired and I am trying to make a better repair. There looks to be pad and trace damage and im happy to relocate the header pin/pins to...
                            06-24-2024, 01:24 PM
                          • grimacelord
                            NEC TurboExpress On/Off Power Switch Replacement Help
                            by grimacelord
                            Hello,

                            I've been working on a NEC TurboExpress and I accidentally got the plastic inside the power ON/OFF switch too hot while doing other repairs and melted it. At first, it would still power on when sliding the switch, but you had to really press inward while sliding to get it to work.

                            I removed the switch component and tried to gently melt the plastic back so it would work more reliably and all I managed to do was make it worse.

                            I need to find a replacement On/OFF switch for this, but having some trouble figuring out which kind of switch I need....
                            11-09-2023, 09:49 AM
                          • Dani_2024
                            Sceptre U550CV-UMR 4K LED, Bad Caps on Main Power Board?
                            by Dani_2024
                            Hi and thanks in advance for any input you might provide!
                            I have a Sceptre U550CV-UMRD8POTV83BB 4K LED (this is a dumb tv) that I bought new in August 2021, so It's just completed 3 years.
                            Main power board model: TP.MS3683.PC821 T-Con board: N4TP546UHDPU2L_BO

                            Last Sunday I was watching a dvd and fell asleep for about half hour, when I awoke the tv screen was black and couldn't get the dvd menu to show, so I changed the input to antenna and had sound but no picture, turned it off. I then got online and found this great site! ....read many troubleshooting tips and this...
                            10-28-2024, 05:06 PM
                          • Document Archive
                            HP Pavilion Power Pavilion Power 15-cb009nl Notebook 15 Specification for Upgrade or Repair
                            by Document Archive
                            This specification for the HP Pavilion Power Pavilion Power 15-cb009nl Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Pavilion Power 15-cb009nl boardview and Pavilion Power 15-cb009nl schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that...
                            09-06-2024, 05:59 AM
                          • Loading...
                          • No more items.
                          Working...