Vizio SV421XVT Not turning on

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  • Louis82
    Badcaps Veteran
    • Feb 2012
    • 240
    • USA
    #1

    Vizio SV421XVT Not turning on

    Hello,

    I have this Vizio Tv SV421XVT that does not turn on. Front orange light is on and does not change to white after pressing power button as vizio tv's usually do.

    Power supply and backlight tested good. I used jump on PS-ON and BL-ON. My next step is the main board. I looked for bad voltage regulators but I'm not sure if they are good or bad. Here are the reading:

    U4 (L213 G9117)
    IN: 3.3v
    OUT:1.2v
    ADJ: 0v

    U7 (L213 G9117)
    IN: 5.1v
    OUT: 3.3v
    ADJ: 2.0v

    U2 (L213 G9117)
    IN: 5.1v
    OUT: 3.3v
    ADJ: 2.0v

    U6 (L213 G9117)
    IN: 12v
    OUT: 8.1v
    ADJ: 6.9v

    Thank you for your help.
    Attached Files
    Tags: None
    • Nick's Tvs
      Badcaps Veteran
      • Jan 2014
      • 621
      • USA
      #2
      Re: Vizio SV421XVT Not turning on

      http://www.shopjimmy.com/vizio-sv421...eprom-only.htm
      Symptoms EEPROM replacement MAY fix:
      - TV won’t power on with remote or buttons (LED indicator remains same color)

      I have gotten probably 5 vizio tv's out of 8 in the last months with bad EEPROM chips. This is not a solution, but just a suggestion. They are very cheap so in my opinion worth a try especially since these main boards are super expensive.

        Comment

        • Nick's Tvs
          Badcaps Veteran
          • Jan 2014
          • 621
          • USA
          #3
          Re: Vizio SV421XVT Not turning on

          Have you gotten any new information about the tv, or have you decided to give the EEPROM a try?

            Comment

            • Louis82
              Badcaps Veteran
              • Feb 2012
              • 240
              • USA
              #4
              Re: Vizio SV421XVT Not turning on

              Hi Nick.
              Thank you for responding. It was on my mind to try replacing EPROM but in my experience only 1 out of 8 have worked for me. I ordered it anyway and will report back the results. Thank you again.

                Comment

                • Nick's Tvs
                  Badcaps Veteran
                  • Jan 2014
                  • 621
                  • USA
                  #5
                  Re: Vizio SV421XVT Not turning on

                  Forgot to ask but when you jumped PS-ON and BL-ON did you get backlight?
                  As for the EEPROM fingers crossed.
                  Last edited by Nick's Tvs; 12-12-2015, 02:23 AM.

                    Comment

                    • Louis82
                      Badcaps Veteran
                      • Feb 2012
                      • 240
                      • USA
                      #6
                      Re: Vizio SV421XVT Not turning on

                      Yes. Backlight works after applying jumps on BL-ON. Replaced EPROM, it didn't work.

                        Comment

                        • Louis82
                          Badcaps Veteran
                          • Feb 2012
                          • 240
                          • USA
                          #7
                          Re: Vizio SV421XVT Not turning on

                          I tried the trouble shooting performed on the link below and i get backlight, front orange light remains same color and no display or picture at all.

                          https://www.badcaps.net/forum/showthread.php?t=34303

                          Any suggestion?

                            Comment

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