Vizio E422VL-completely dead

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  • bhughes2912
    Member
    • Dec 2015
    • 10
    • USA
    #1

    Vizio E422VL-completely dead

    Hi everyone,

    Need some help troubleshooting this vizio. The set appears completely dead with no Logo light and does nothing when pushing the power button. I have done some tests. The power supply appears to be working correctly. By isolating the power supply, I get the 5v standby. Once I connect only the mainboard to the power supply, I get 12v along with the 5v. The weird thing is the mainboard sends 2.2v on the power on/off pin even before hitting the power. That is why I have 12v before powering up the set. I have checked the voltage regulators and they function correctly. I am looking for ideas on troubleshooting this LCD.

    Thanks in advance,
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    • bhughes2912
      Member
      • Dec 2015
      • 10
      • USA
      #2
      Re: Vizio E422VL-completely dead

      Hi Everyone,

      Its been a while since I posted this. Has no one ever experienced this problem or know where to focus my testing?

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8146
          • Canada
          #3
          Re: Vizio E422VL-completely dead

          So what you saying is that the PSon signal from the main board is "stuck on", but yet the TV won't power up? Looks like a main board problem to me.
          Try unplugging the IR board?

            Comment

            • bhughes2912
              Member
              • Dec 2015
              • 10
              • USA
              #4
              Re: Vizio E422VL-completely dead

              Hey CapLeaker,

              That's a good way to put it, its "stuck on" but will not power up. I agree with you, its the mainboard. I have shorted the PSon and backlight on with 1k resistors and the backlights came on. So, I figure that rules out the PS. I have tried unplugging everything except the PS and nothing changes. The fuses on the main board check out. The voltage regulators also check out. I am stump with this one.

                Comment

                • CapLeaker
                  Leaking Member
                  • Dec 2014
                  • 8146
                  • Canada
                  #5
                  Re: Vizio E422VL-completely dead

                  There is a eeprom to be had at SJ, but it doesn't mention that symptom you have. So I guess you should look for a new main board.
                  You also could try heating (hair dryer) or cooling (can of air upside down). Freeze the eeprom, see what happens.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #6
                      Re: Vizio E422VL-completely dead

                      Originally posted by capleaker
                      there is a eeprom to be had at sj, but it doesn't mention that symptom you have. So i guess you should look for a new main board.
                      You also could try heating (hair dryer) or cooling (can of air upside down). Freeze the eeprom, see what happens.
                      +1
                      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

                        • Agent24
                          I see dead caps
                          • Oct 2007
                          • 4953
                          • New Zealand
                          #7
                          Re: Vizio E422VL-completely dead

                          Or there is some problem with PSOn signal generation circuitry on mainboard, shorted transistor perhaps?
                          "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                          -David VanHorn

                            Comment

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