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Vizio E422VL-completely dead

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    #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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    #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

      #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

        #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

          #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

            #6
            Re: Vizio E422VL-completely dead

            Originally posted by capleaker View Post
            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

              #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

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