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VIZIO E420i LED Strip Issue

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    #21
    Re: VIZIO E420i LED Strip Issue

    See post #6
    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


      #22
      Re: VIZIO E420i LED Strip Issue

      OK I think I posted pics of the wrong Power PCB...

      Attached are the pics of the board that is on this E420i...
      Attached Files

      Comment


        #23
        Re: VIZIO E420i LED Strip Issue

        Originally posted by SLK001 View Post
        Look for broken connections on all the connectors for each strip that doesn't light.

        Have you tried to swap strips (one that lights for one that doesn't)? You might be able to zero in on a possible bad connection/strip. The circuit for these backlights actually goes from one to another - one break in a connection will kill the whole circuit.

        Thanx for the reply.. Yea, I swapped around the LED strips and also used my LED tester and confirmed that all 5 of the strips are fully functional...

        Comment


          #24
          Re: VIZIO E420i LED Strip Issue

          So this CORRECT power supply board picture was also installed in ANOTHER VIZIO E420i and it works?
          But no matter what, this board also has two LED driver circuits so the Voltage (V out1, V out2) at the Anode of each string should be > 100V, but per your measurement, one does not really have any output at all.
          Last edited by budm; 11-18-2017, 04:45 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


            #25
            Re: VIZIO E420i LED Strip Issue

            Apologies for the delays... My TV shop is only open on the weekends and I usually take mondays off..

            I am going to set up the working E420i right next to the non working one and compare voltages...

            Give me about 5 mins to set it up..

            Comment


              #26
              Re: VIZIO E420i LED Strip Issue

              OK....

              I have both E420s side by side...

              Voltages as pictured..

              FULL WORKING
              1- 3.3v
              2- 78.3v
              3- 5.1v
              4- 117.2v

              OUTER LEDs OFF
              1- .2v
              2- 92v-98v
              3- 5.2v
              4-113v

              I swap the boards and there are minor discrepancies. On the full working unit, the voltages are about 1 volt off... On the unit with the outer LED strips off, the voltage on #2 is about 64-67 volts instead of 92-98 volts...
              Attached Files

              Comment


                #27
                Re: VIZIO E420i LED Strip Issue

                SOLVED!!!!

                I got in a 3rd E420i that had a LED Strip issue.. Turns out it was a simple replace the strip fix... Replaced 3 strips that had bad LEDs and it was golden..

                But, since I had it broke down, I decided to test some different parts on the one that was giving me nosebleeds.....

                I replaced the green power strip... No difference.... Wracking my brain and looking over it all, the *ONLY* part I haven't swapped out is the small connector that goes from the Power PCB to the green LED Power Strip...

                Swapped that out and SOME BEACH!!!! It worked!!!!

                So, problem solved!!

                Thanx to all who chimed in...
                Attached Files

                Comment


                  #28
                  Re: VIZIO E420i LED Strip Issue

                  Glad to hear it is working, those SMD connector has poor mechanical support.
                  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


                    #29
                    Re: VIZIO E420i LED Strip Issue

                    Yea, it's weird.. I cleaned the connections on that bad cable and plugged it in and it worked.. But then I tried it again a few mins later and it didn't..

                    Thinking I'll either rewire the thing or just order a new one...

                    But it's really kewl.. THREE working VIZIO 42" LED SMART TVs...

                    Thanx again...

                    Comment


                      #30
                      Re: VIZIO E420i LED Strip Issue

                      It's really SOOO nice, repair wise, when you have multiples of the exact model..
                      Attached Files
                      Last edited by Michale32086; 11-25-2017, 03:06 AM.

                      Comment

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