Vizio M55-C2 Mainboard Issues

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  • JunkmanJimbo
    Senior Member
    • Mar 2017
    • 194
    • United States
    #1

    Vizio M55-C2 Mainboard Issues

    I got this tv in a wholesale lot and I'm trying to repair it for resell. I noticed on the original main board that the component at location L9001 was burnt. So, I ordered a replacement board, installed it, powered on the tv and the same component blew. Can someone tell me what component would be at location L9001 (please see pictures) and if it might be possible to replace it since it's burnt so bad. Also, has anyone had this same issue with this model tv? Could the power supply be causing this or could it be the t-con or maybe the screen itself? Any help will be greatly appreciated. I don't know whether to trash this tv and take my loss or attempt to repair it. Thanks in advance.
    Attached Files
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    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12269
      • U.S.
      #2
      Re: Vizio M55-C2 Mainboard Issues

      L stands for inductor.

        Comment

        • JunkmanJimbo
          Senior Member
          • Mar 2017
          • 194
          • United States
          #3
          Re: Vizio M55-C2 Mainboard Issues

          Thanks for your quick reply. Do you know of a way to find the part number of that inductor? Do you think it's possible to attempt to install another inductor as bad as the board is burnt? And, do you have an opinion as to what could be causing this inductor to keep blowing? Thanks.

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12269
              • U.S.
              #4
              Re: Vizio M55-C2 Mainboard Issues

              Not sure, wonder if the power supply has a problem, as you said you tried a new mainboard and it popped the same inductor, some of the pros here may know.

                Comment

                • budwich
                  Badcaps Legend
                  • Jul 2015
                  • 3097
                  • Canada
                  #5
                  Re: Vizio M55-C2 Mainboard Issues

                  you might want to post a picture of the back to show how things are connected. Of course, you might want to check what the inductor was connected to in the cabling, if it is and then follow that to the other end.

                    Comment

                    • JunkmanJimbo
                      Senior Member
                      • Mar 2017
                      • 194
                      • United States
                      #6
                      Re: Vizio M55-C2 Mainboard Issues

                      Here's a couple more pictures, one of the back and one at an angle showing the connectors.
                      I can't find a schematic of this board to determine which inductor I would need to order.
                      Attached Files
                      Last edited by JunkmanJimbo; 11-17-2018, 02:21 PM.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA
                          #7
                          Re: Vizio M55-C2 Mainboard Issues

                          That inductor burns out can be due to 1) short circuit on the input side (Source) of the P-CH MOSFET (4435) Q9000 which supplies switched 12V to run the T-CON board. 2) Short Circuit on the output side (Drain) due to shorted caps, or shorted T-CON.
                          Bottom line, look for very low Ohm readings on the input and output side of the MOSFET first.
                          Attached Files
                          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

                            • JunkmanJimbo
                              Senior Member
                              • Mar 2017
                              • 194
                              • United States
                              #8
                              Re: Vizio M55-C2 Mainboard Issues

                              Thanks bud, I'll let you know what I find.

                                Comment

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