Vizio VA26LHDTV10T

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  • CraigR
    Badcaps Veteran
    • Dec 2013
    • 959
    • USA

    #1

    Vizio VA26LHDTV10T

    Vizio VA26LHDTV10T When plugged in the logo is white and when the power button is pushed the logo turns orange and stays that way. I get no picture or sound. I checked the voltages at the connector and I am not getting the 24v or the 12v as stated next to the connector but I do have the 5v and 5v at the PS_ON just not sure what my next step should be.
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Vizio VA26LHDTV10T

    What DC voltage (measure right at the two legs of the cap) do you get at the main filter cap (450VDC cap laying on its side) when PS_ON is present?
    Can I see the pictures of all the boards? There is a board with Brown/Blue wires connected to it, like to know what that board is.
    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

    • CraigR
      Badcaps Veteran
      • Dec 2013
      • 959
      • USA

      #3
      Re: Vizio VA26LHDTV10T

      Here is the other board. I will check voltage also.
      Attached Files

      Comment

      • CraigR
        Badcaps Veteran
        • Dec 2013
        • 959
        • USA

        #4
        Re: Vizio VA26LHDTV10T

        I also get 393.1 volts at the cap.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Vizio VA26LHDTV10T

          OK, so the PFC Voltage booster is OK, you need to inspect the 12V, 24V SMPS section next. Post the picture of the bottom side of the power supply board, then look at the area of the 12V/24V section.
          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

          • CraigR
            Badcaps Veteran
            • Dec 2013
            • 959
            • USA

            #6
            Re: Vizio VA26LHDTV10T

            Here is the bottom.
            Attached Files

            Comment

            • CraigR
              Badcaps Veteran
              • Dec 2013
              • 959
              • USA

              #7
              Re: Vizio VA26LHDTV10T

              Just pulled out of circuit and checked the diode the cap and the mosfet it the 12/24 volt section you marked and all good.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Vizio VA26LHDTV10T

                OK, there is a SMD 8-PIN SMPS IC that drives the MOSFET for the 12V/24V, can you get the number?
                Also there is a small electrolytics cap next to the MOSFET heat sink, you can try replacing that cap which is the start up cap.
                BTW, the two rectifier Diodes for the 12V (Axial lead) and the 24V (TO-220 case mounted on the heat sink) checked OK?
                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

                • CraigR
                  Badcaps Veteran
                  • Dec 2013
                  • 959
                  • USA

                  #9
                  Re: Vizio VA26LHDTV10T

                  I assume you mean the tiny chip on the bottom of the board. all I can make out is 23A and under it looks like 4388. I had that cap out and tested with esr meter and is good.Are you talking what I have circled in the picture to check? If not would it be possible to circle what I should check in the picture? Thanks.
                  Attached Files
                  Last edited by CraigR; 03-09-2014, 10:28 PM.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: Vizio VA26LHDTV10T

                    Those are MOSFET for the inverter circuits, you need the one I marked as 12v/24v SMPS section.
                    Attached Files
                    Last edited by budm; 03-10-2014, 08:52 AM.
                    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

                    • CraigR
                      Badcaps Veteran
                      • Dec 2013
                      • 959
                      • USA

                      #11
                      Re: Vizio VA26LHDTV10T

                      Ok The diode reads 1337 one way and 228 the other and I'm takeing the other out of circuit now.

                      Comment

                      • CraigR
                        Badcaps Veteran
                        • Dec 2013
                        • 959
                        • USA

                        #12
                        Re: Vizio VA26LHDTV10T

                        And that reads with the black probe on the center leg 215 for both sides with red lead and OL in any other configuration. Do you think it would pay to pull all the caps out and check them?
                        Last edited by CraigR; 03-10-2014, 10:07 AM.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: Vizio VA26LHDTV10T

                          The only start up cap that I can think off that will not let the IC to start running, the main key is the spec of the IC so we can check the voltage at the VCC pin, but what you can do right now is to check the DC voltage right at the two legs of the start up cap, just be careful because you are working in the primary side of the circuit.
                          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

                          • CraigR
                            Badcaps Veteran
                            • Dec 2013
                            • 959
                            • USA

                            #14
                            Re: Vizio VA26LHDTV10T

                            Well this is weird, I soldered stuff back in and put the board back in to check voltage at that start up cap and now the tv is working. I wonder if it is a heat issue? Most of the time the tv was in my garage where it is kind of cold and I had it in the house all night where it warmed up. 30F here in Wisconsin so I stuck it outside and will let it get cold then check right away.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Vizio VA26LHDTV10T

                              Cap when it is heated up, the ESR will go down, when it is cold the ESR will rise. When I repair, I will automatically replace the start up cap as part of the set of cap to replace. If the cap is not too far gone, I will use hair dryer to heat up the cap to see if the power supply will start up.
                              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

                              • CraigR
                                Badcaps Veteran
                                • Dec 2013
                                • 959
                                • USA

                                #16
                                Re: Vizio VA26LHDTV10T

                                Must be, Just brought it in and dead again. I will see about replacing that cap and get back. Thanks so much for all the help budm! I will report back as I might even have one.

                                Comment

                                • CraigR
                                  Badcaps Veteran
                                  • Dec 2013
                                  • 959
                                  • USA

                                  #17
                                  Re: Vizio VA26LHDTV10T

                                  I pulled out what I thought was the start up cap like you have circled and checked it with my ESR70 and esr was .66 and cap was 9.16 So I tried 2 other caps and still no start up.

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #18
                                    Re: Vizio VA26LHDTV10T

                                    C841?? I think? Try heating up the board with hair dryer to see if it will start up. It can be cold solder joints some where also since you were able to get it to run.
                                    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

                                    • CraigR
                                      Badcaps Veteran
                                      • Dec 2013
                                      • 959
                                      • USA

                                      #19
                                      Re: Vizio VA26LHDTV10T

                                      C941 and yes I could get it to start with a heat gun.

                                      Comment

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