Vizio M550SV No Power/Lightning Strike

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  • gideon277
    Member
    • Jun 2013
    • 42
    • United States

    #1

    Vizio M550SV No Power/Lightning Strike

    This tv only has two boards the Power Supply and the Control or Mainboard. (My volt meter died so will be testing voltages later) I did conduct a thorough visual examinations of the boards and they appear to be fine. I checked continuity on all fuses and they tested good. The Vizio LOGO on the front of the television does not come on while plugged in which suggests to me no stand by power.
    Attached Files
  • nomoresonys
    Badcaps Legend
    • Jan 2013
    • 12099
    • U.S.

    #2
    Re: Vizio M550SV No Power/Lightning Strike

    if you have a digital multimeter, check for expected voltages on connectors/cables going to the other board, see the legend/label, next to the connectors? check stby first, report any that are not as marked on label, as always be careful working with power supply, HIGH VOLTAGE, on primary side can be deadly.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Vizio M550SV No Power/Lightning Strike

      Check the main AC fuse (white fuse with red band), if it's OK then check the DC Voltage right at the two legs of the main filter caps (68uF 450VDC) to see if it has 160VDC (you must have this voltage before going any further), be real careful not to slip the probes and do not touch anything with your hands.
      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

      • nomoresonys
        Badcaps Legend
        • Jan 2013
        • 12099
        • U.S.

        #4
        Re: Vizio M550SV No Power/Lightning Strike

        looks like theres another fuse there by the filter caps too.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Vizio M550SV No Power/Lightning Strike

          I believe that fuse is connected to the output of the PFC Voltage circuit to feed the man power supply section.
          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

          • gideon277
            Member
            • Jun 2013
            • 42
            • United States

            #6
            Re: Vizio M550SV No Power/Lightning Strike

            Continuity on both of the fuses checks out as good. I am getting 6 volts on in of DC fuse the one by the power connector. This is when the set is plugged in. Of course when power is pressed absolutely nothing happens. All standby numbers look fine.

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12099
              • U.S.

              #7
              Re: Vizio M550SV No Power/Lightning Strike

              ok, did you check all expected voltages on power supply?, should be labels by the connectors.

              Comment

              • nomoresonys
                Badcaps Legend
                • Jan 2013
                • 12099
                • U.S.

                #8
                Re: Vizio M550SV No Power/Lightning Strike

                Originally posted by budm
                Check the main AC fuse (white fuse with red band), if it's OK then check the DC Voltage right at the two legs of the main filter caps (68uF 450VDC) to see if it has 160VDC (you must have this voltage before going any further), be real careful not to slip the probes and do not touch anything with your hands.
                also did you test this?

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Vizio M550SV No Power/Lightning Strike

                  Originally posted by gideon277
                  Continuity on both of the fuses checks out as good. I am getting 6 volts on in of DC fuse the one by the power connector. This is when the set is plugged in. Of course when power is pressed absolutely nothing happens. All standby numbers look fine.
                  Where did you put the black probe of your meter?
                  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

                  • nomoresonys
                    Badcaps Legend
                    • Jan 2013
                    • 12099
                    • U.S.

                    #10
                    Re: Vizio M550SV No Power/Lightning Strike

                    when checking the connectors black probe goes to ground ether chassis or a screw, etc.

                    Comment

                    • gideon277
                      Member
                      • Jun 2013
                      • 42
                      • United States

                      #11
                      Re: Vizio M550SV No Power/Lightning Strike

                      I keep the black probe on the ground wire that goes to the chassis by the main power plugin. There are two caps side by side which cap are you referring to? At any rate on the right leg of each of those caps I get the same reading for 67.1
                      Last edited by gideon277; 02-04-2015, 11:08 AM.

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Vizio M550SV No Power/Lightning Strike

                        When you make the Voltage measurement in the primary (hot) side of the circuit, you must use the negative leg of the main filter cap and the GND ref. for your meter.
                        When making Voltage measurement in the isolated secondary side of the circuit, you can use chassis as the GND ref, because the Isolated secondary side power supply circuit GND is tied to the chassis.

                        "At any rate on the right leg of each of those caps I get the same reading for 67.1" That is why you get that wrong reading of 67V.

                        POST #3: "if it's OK then check the DC Voltage right at the two legs of the main filter caps (68uF 450VDC) to see if it has 160VDC" That is why I gave the instruction to measure the Voltage RIGHT AT THE TWO LEGS OF THE CAP.

                        Please follow the instruction carefully since wrong readings will make it very hard for us to troubleshoot the problems.
                        Last edited by budm; 02-04-2015, 12:29 PM.
                        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

                        • gideon277
                          Member
                          • Jun 2013
                          • 42
                          • United States

                          #13
                          Re: Vizio M550SV No Power/Lightning Strike

                          So red probe on right leg and black probe where?

                          Comment

                          • drussell
                            Senior Member
                            • Nov 2014
                            • 144
                            • Canada

                            #14
                            Re: Vizio M550SV No Power/Lightning Strike

                            Originally posted by gideon277
                            So red probe on right leg and black probe where?
                            To the left leg....

                            One probe to each leg of one capacitor...

                            You are trying to measure the voltage that is being applied to that capacitor.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Vizio M550SV No Power/Lightning Strike

                              "right at the two legs of the main filter caps (68uF 450VDC)"

                              I can see that this is not going to be easy for me after 12 posts.
                              Last edited by budm; 02-04-2015, 08:31 PM.
                              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

                              • nomoresonys
                                Badcaps Legend
                                • Jan 2013
                                • 12099
                                • U.S.

                                #16
                                Re: Vizio M550SV No Power/Lightning Strike

                                Comment

                                • nomoresonys
                                  Badcaps Legend
                                  • Jan 2013
                                  • 12099
                                  • U.S.

                                  #17
                                  Re: Vizio M550SV No Power/Lightning Strike

                                  Originally posted by nomoresonys
                                  Last edited by nomoresonys; 02-04-2015, 11:51 PM.

                                  Comment

                                  • gideon277
                                    Member
                                    • Jun 2013
                                    • 42
                                    • United States

                                    #18
                                    Re: Vizio M550SV No Power/Lightning Strike

                                    Alright, wow I just had a brainfart moment. Take it easy I'll post voltages later this morning.

                                    Comment

                                    • gideon277
                                      Member
                                      • Jun 2013
                                      • 42
                                      • United States

                                      #19
                                      Re: Vizio M550SV No Power/Lightning Strike

                                      Okay on my auto sensing volt meter I get 326vDC on each of the caps. My meter is autosensing.

                                      Comment

                                      • budm
                                        Badcaps Legend
                                        • Feb 2010
                                        • 40746
                                        • USA

                                        #20
                                        Re: Vizio M550SV No Power/Lightning Strike

                                        That does not look right, disconnect the cables between the main board and the power supply board and recheck that Voltage on the cap again, it should have only around 160VDC.
                                        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

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