Vizio GV42LHDTV10A - Stays on 10 seconds - then shuts off

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  • drpj23
    Badcaps Veteran
    • May 2012
    • 528
    • USA
    #1

    Vizio GV42LHDTV10A - Stays on 10 seconds - then shuts off

    Upon plug in, the backlight will stay on 5-7 seconds then go out along with the TV going back to standby 3 seconds later.
    The TV came on with the blue screen with "No Signal" Text floating.

    I have detached inverters and TCON and problem still persists.

    The main had one bad regulator (DU4) which was an adjustable but with that replaced the problem is still here.

    Anything else to look for on these mains?
    Vizio's guide for DC-DC converters just checked U1 (Dual FET) pin 1, 3, 5, 6, 7, 8 had 5.162v on them (good?) and then checked the regs.
    Attached Files

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    Tags: None
    • Cosmo66
      Senior Member
      • Nov 2012
      • 87
      • USA
      #2
      Re: Vizio GV42LHDTV10A - Stays on 10 seconds - then shuts off

      Did you remove a heatsink?

        Comment

        • drpj23
          Badcaps Veteran
          • May 2012
          • 528
          • USA
          #3
          Re: Vizio GV42LHDTV10A - Stays on 10 seconds - then shuts off

          There is a clip for what I presume to be the audio driver that is removed, but that is it.

            Comment

            • Dgtech
              E. Technician
              • Apr 2009
              • 1462
              • Steeler
              #4
              Re: Vizio GV42LHDTV10A - Stays on 10 seconds - then shuts off

              What made you think that the regulator was bad?

              What voltages were you seeing on all of the regulators?
              The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: Vizio GV42LHDTV10A - Stays on 10 seconds - then shuts off

                  Was it in the PC VGA input mode? Does it do that if you use Video source input mode?
                  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

                    • drpj23
                      Badcaps Veteran
                      • May 2012
                      • 528
                      • USA
                      #6
                      Re: Vizio GV42LHDTV10A - Stays on 10 seconds - then shuts off

                      The regulator was under the 1.25 difference, that is why it was replaced.

                      And it is (budm), it is now on another input and is currently on as I type.
                      Is that an actual setting or a fault with that input?

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA
                          #7
                          Re: Vizio GV42LHDTV10A - Stays on 10 seconds - then shuts off

                          That is normal, it is just like computer monitor that will go in to standby mode if it does not detect video signal from PC, and if you leave the TV in tuner mode but do not have antenna or cable attach, it will also go into standby mode after 10 seconds to minutes, most TVs are setup that way now.
                          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

                            • drpj23
                              Badcaps Veteran
                              • May 2012
                              • 528
                              • USA
                              #8
                              Re: Vizio GV42LHDTV10A - Stays on 10 seconds - then shuts off

                              Oh, well I am familiar with the auto-off features but I have never had one do it that fast lol.
                              I'll consider it lesson learned.

                                Comment

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