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Vizio D55un-E1 No picture or Backlights

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    #1

    Vizio D55un-E1 No picture or Backlights

    I have a Vizio D55un-E1 that has both no backlights or picture to the screen. I try to flash a light to the screen and cannot see any faint picture. When the tv is plugged in and powered on the led light will show for a couple seconds and then slowly fade away. Pictures are posted below.
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    #2
    Re: Vizio D55un-E1 No picture or Backlights

    I get 34 volts testing out of VLED pins and when testing the pins from power supply i get voltages that are correct towards the reference key.

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      #3
      Re: Vizio D55un-E1 No picture or Backlights

      Originally posted by blake.s View Post
      I get 34 volts testing out of VLED pins and when testing the pins from power supply i get voltages that are correct towards the reference key.
      Monitor the VLED voltage when you first turn the tv on, Does it come up to a higher voltage then drop down to 34 volts?
      What is the voltage on 15- BL_O/F and 16 - DIM
      Last edited by R_J; 02-12-2020, 02:53 PM.

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        #4
        Re: Vizio D55un-E1 No picture or Backlights

        When the tv is first turned on it will go to 55v/56v and then drop to 34v. When powered on and off again it will just go to 34v. The only time i can get it at 55v ish is when i unplug for a couple seconds and plug the tv back in.

        The voltage on 15- BL_O/F and 16 - DIM is at 4.8v.
        Last edited by blake.s; 02-12-2020, 03:11 PM.

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          #5
          Re: Vizio D55un-E1 No picture or Backlights

          If the voltage gets to 55~65v then drops , this usually indicates an open led string. The led circuit monitors the led current and will error if it is to high or in this case likely 0 current.
          If you look at the back of the board and CN9101, pins 15&16 may not be used
          Last edited by R_J; 02-12-2020, 03:25 PM.

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            #6
            Re: Vizio D55un-E1 No picture or Backlights

            Which means the led strips are causing it to function that way? That was my original thought, just thought i would verify my thinking.

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              #7
              Re: Vizio D55un-E1 No picture or Backlights

              Originally posted by blake.s View Post
              Which means the led strips are causing it to function that way? That was my original thought, just thought i would verify my thinking.
              That's what it looks like. an led tester could confirm it without opening the panel

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                #8
                Re: Vizio D55un-E1 No picture or Backlights

                I have an led tester. How is that done without opening the panel?

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                  #9
                  Re: Vizio D55un-E1 No picture or Backlights

                  Unplug the connector from the power supply and use the + of the tester on one of the brown wires and the - on the black wires. If you probe at the panel, I suspect all the browns are connected together at the panel, so probe at the panel end. It might not be a bad led but a poor connection in that panel plug
                  Last edited by R_J; 02-12-2020, 03:51 PM.

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