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Vizio E470i-A0 Question

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    #1

    Vizio E470i-A0 Question

    Is there anyway to check the LED array without disassembling it.
    I have aprox 130 v on the v outs when they are not on. I assume this is because the connection is open to the PS

    It works sometimes for a while and then it quits.

    Has anyone found a connection issue inside causing this?

    Thanks!
    Tags: None
    #2
    Re: Vizio E470i-A0 Question

    When it works for a while what are the voltages on the connectors? They may also be printed on the power supply.
    Willing to help but I'm no expert.

    Comment

      #3
      Re: Vizio E470i-A0 Question

      I'll try to get that if I can get it to stay on long enough.
      What should I expect

      Comment

        #4
        Re: Vizio E470i-A0 Question

        There should be a legend on the power supply board giving the various voltages on it at the various connectors.
        Some photo's could help.
        Willing to help but I'm no expert.

        Comment

          #5
          Re: Vizio E470i-A0 Question

          I got lucky today and found a junk LG unit that has the same panel (almost.)
          I connected the panel to the Vizio and the backlight works proving the problem is with the LED array.
          The back plate is not the same, IE mounting points, so I plan on using the LG's backlight parts in the Vizios panel

          There are no voltages marked on the PS board for the backlights.

          I will post the working voltages when I get the panel fixed.

          Comment

            #6
            Re: Vizio E470i-A0 Question

            In post #1 "it works sometimes" then I wonder if you have a problem with the led strip connectors under the panel and not the leds themselves which is a problem found quite often. Soldering wire links across the connectors resolves this problem.
            Willing to help but I'm no expert.

            Comment

              #7
              Re: Vizio E470i-A0 Question

              I guess we will see.. I have to disassemble the panel in any case so I might as well put in a working parts.
              I will check out the old connector and see if it's bad.. I assume it's possibly open.

              Comment

                #8
                Re: Vizio E470i-A0 Question

                Originally posted by dick_barton View Post
                In post #1 "it works sometimes" then I wonder if you have a problem with the led strip connectors under the panel and not the LED themselves which is a problem found quite often. Soldering wire links across the connectors resolves this problem.
                Not the issue. The connector PCB was fine.

                The bottom row left side was causing the the problem with shutdown.
                After I replaced that strip it fired up and I still had an issue.

                I tested the suspect Left strips with a 20V power supply, the bottom left was completely dead. You can test the Left sides with a 20V supply but it's not enough to fire the whole strip. My guess is you can get the entire strip to fire if you have a supply that can bring 40 or 50 VDC to the entire strip.
                The right side would not test this way.

                The middle three rows were not firing.
                Solution: Replace the left side L1 strip on the second from the top. The middle rows fired but still issues.

                Three LEDs were out on different strips. Second row R1 right most, 4 row R1 right most, fifth row L1 has an LED that is slow starting takes about 10 seconds to fire.

                Voltages while running: Will post when I get it off its back and reassembled.
                The donor LG set had a lot of bad parts not enough to complete the job unfortunately

                Comment

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