Vizio E420VL problem

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  • CraigR
    Badcaps Veteran
    • Dec 2013
    • 959
    • USA

    #1

    Vizio E420VL problem

    I have a Vizio E420VL and when plugged in the logo is orange and push the power button and logo turns white but that's it. Checked the power board visually and no swollen caps or signs of anything getting hot. On the underside all solder joints look good under lighted magnification. I have checked the connection and seem to have all the correct voltages at the plug. I have read on this forum before posting this about a possible EEProm problem with these main boards so was hoping the experts would chime in and give me their opinion on this or if any further testing is required.
    Attached Files
  • mu2
    Badcaps Veteran
    • Oct 2009
    • 217

    #2
    Re: Vizio E420VL problem

    Craig,

    I wish I could help with an exact solution but I have the same set and same problem.
    I bought the programmed eeprom on e-bay and it didn't fix the issue. After I replaced the chip I noticed a chip on the main board getting very hot. It is P13HDMI245-AZLE and as I recall it was near the hdmi connectors. I think I missed it in my haste.
    You said that nothing was getting hot - but just double check this chip before you order the eeprom.
    Mouser has the hdmi chip in stock but I haven't changed it yet.
    It is possible that my set has multiple problems including the hdmi chip and eeprom.
    Good luck.

    Mike

    Comment

    • CraigR
      Badcaps Veteran
      • Dec 2013
      • 959
      • USA

      #3
      Re: Vizio E420VL problem

      Looks ok to me right now. But thanks for the info.

      Comment

      • ecking767
        Badcaps Veteran
        • Oct 2009
        • 492
        • USA

        #4
        Re: Vizio E420VL problem

        Question, when you power up your TV, can you power it off after being on for at least 30 second by press the power button?

        Comment

        • CraigR
          Badcaps Veteran
          • Dec 2013
          • 959
          • USA

          #5
          Re: Vizio E420VL problem

          Logo does go back to orange after powering off.

          Comment

          • ecking767
            Badcaps Veteran
            • Oct 2009
            • 492
            • USA

            #6
            Re: Vizio E420VL problem

            that tell me it may not be an EEPROM problem, can you correct a signal to the TV, or do you know the last known input that was being used?

            I will try to see if there is any sound by connecting to the HDMI ports using a source like PS3, Direct TV or DVD player


            or try the flash light test to the screen to see if any picture it present. like the menu once press the button?
            Last edited by ecking767; 03-30-2014, 03:24 PM.

            Comment

            • CraigR
              Badcaps Veteran
              • Dec 2013
              • 959
              • USA

              #7
              Re: Vizio E420VL problem

              not sure what you mean by correct a signal to the tv and I have no idea what it was set on last but I will try hooking up a video source and see it anything happens.

              Comment

              • CraigR
                Badcaps Veteran
                • Dec 2013
                • 959
                • USA

                #8
                Re: Vizio E420VL problem

                Ok I hooked a dvd player to it then cycled through the inputs and I DO have sound. I put a mag light up to the screen all over and can't see any video however.

                Comment

                • ecking767
                  Badcaps Veteran
                  • Oct 2009
                  • 492
                  • USA

                  #9
                  Re: Vizio E420VL problem

                  okay that good news, your main board is working. if you have a volt meter you will need to measure the "BL_ON" on the power supply connector.

                  Comment

                  • CraigR
                    Badcaps Veteran
                    • Dec 2013
                    • 959
                    • USA

                    #10
                    Re: Vizio E420VL problem

                    There is nothing marked "BL_ON" but I do have one marked "OFF_ON" and that has 3.36V but I also have one marked "LAMP" and that has no voltage.

                    Comment

                    • ecking767
                      Badcaps Veteran
                      • Oct 2009
                      • 492
                      • USA

                      #11
                      Re: Vizio E420VL problem

                      its seen to be your power supply inverter board that is not working. troubleshooting down to component will be complicated for me. I will replace the power supply & inverter board.

                      Comment

                      • CraigR
                        Badcaps Veteran
                        • Dec 2013
                        • 959
                        • USA

                        #12
                        Re: Vizio E420VL problem

                        Even though no image?? I need to repair this one so hopefully one of the Pro's will give me some advice but thanks.

                        Comment

                        • ecking767
                          Badcaps Veteran
                          • Oct 2009
                          • 492
                          • USA

                          #13
                          Re: Vizio E420VL problem

                          yes, to sum up, your TV power off/on, you have sound, unable to see picture because of no back-light, and BL_ON voltage is present.

                          measure the connection label "dim" on the power supply.

                          Comment

                          • CraigR
                            Badcaps Veteran
                            • Dec 2013
                            • 959
                            • USA

                            #14
                            Re: Vizio E420VL problem

                            I think I should be able to see video with a strong flashlight even though no backlight.

                            Comment

                            • ecking767
                              Badcaps Veteran
                              • Oct 2009
                              • 492
                              • USA

                              #15
                              Re: Vizio E420VL problem

                              I guess but not always an image can be seen on the screen using a flash light,depending on the room lighting and picture on the screen. or you could have multiple problems.

                              one other thing you can do is disconnect the two LCD screen cable and then power up the TV.

                              If you have voltage on "on/off" and "dim" pins , then your main board isn't the problem dealing with the no back light issue

                              Comment

                              • CraigR
                                Badcaps Veteran
                                • Dec 2013
                                • 959
                                • USA

                                #16
                                Re: Vizio E420VL problem

                                From the Tcon board? and sorry what do you mean by "dim" pins?

                                Comment

                                • ecking767
                                  Badcaps Veteran
                                  • Oct 2009
                                  • 492
                                  • USA

                                  #17
                                  Re: Vizio E420VL problem

                                  Originally posted by CraigR
                                  From the Tcon board? and sorry what do you mean by "dim" pins?
                                  carefully disconnect the two flat cable from the main board,then power up the TV, too see if any changes come about.

                                  the "dim" on the power supply connector where you measure the "on/off" voltage.
                                  Attached Files

                                  Comment

                                  • CraigR
                                    Badcaps Veteran
                                    • Dec 2013
                                    • 959
                                    • USA

                                    #18
                                    Re: Vizio E420VL problem

                                    with those 2 disconnected I still have 3.2V at the ON_OFF pin

                                    Comment

                                    • ecking767
                                      Badcaps Veteran
                                      • Oct 2009
                                      • 492
                                      • USA

                                      #19
                                      Re: Vizio E420VL problem

                                      Originally posted by CraigR
                                      with those 2 disconnected I still have 3.2V at the ON_OFF pin
                                      what about the pin lable "DIM"? measure the voltage

                                      Comment

                                      • CraigR
                                        Badcaps Veteran
                                        • Dec 2013
                                        • 959
                                        • USA

                                        #20
                                        Re: Vizio E420VL problem

                                        oops, .78v same as when they are connected.

                                        Comment

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