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    #1

    Problem with Vizio LCD VX37L HDTV

    I have Vizeo LCD model VX37L HDTV. Problem is Tv turn off after showing blue screen and no input signal.I can turn on again but tv keep turn off.
    Check DU4 ( instead of U4) on main ,AMC1117 dead (pin2 output 0v ,pin3 3.3v, pin1 0v). I replace with another ADJ AMC1117.Tv shows same problem.
    but DU4 has pin2 1.25v pin3 3.3v pin1 ov. I check r2=0 ohm r1=83 ohm.I do not know why r2 is 0 ohm. Is this shorted because of previous ic damage?
    I also want to know the good voltage of DU4 output.

    Thanks
    Tags: None
    #2
    Re: Problem with Vizio LCD VX37L HDTV

    When it turns off, does VIZIO logo go from white back to orange?
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

      #3
      Re: Problem with Vizio LCD VX37L HDTV

      Hi Tom

      Yes Logo turn to orange when it turn off.

      Comment

        #4
        Re: Problem with Vizio LCD VX37L HDTV

        "Problem is Tv turn off after showing blue screen and no input signal" how long does it stay on? TV will go into standby if it does not receive signals. Can you feed video signals to the TV?
        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

          #5
          Re: Problem with Vizio LCD VX37L HDTV

          Hello Budm.

          Take about 6 seconds to turn off. During the time it is on It does not shows Menu or any OSD only no input. I want to know the voltage out of DU4.
          The LDO 1117 some label U some label DU. I see about 5 DU and about 5 U.

          No schematic.

          Comment

            #6
            Re: Problem with Vizio LCD VX37L HDTV

            After insert input . Tv is now ok.When I had tv I insert antenna It shutdown after 6 seconds.I do not know whether new 1117 or no input shutdown.

            Thanks Budm

            Comment

              #7
              Re: Problem with Vizio LCD VX37L HDTV

              This is a feature of some older Vizios. I saw thesame conclusion on 42" and 50" Vizio plasma too. It appears to trip some people up. Usually No Signal appears at least...
              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

              Comment

                #8
                Re: Problem with Vizio LCD VX37L HDTV

                Originally posted by tom66 View Post
                This is a feature of some older Vizios. I saw thesame conclusion on 42" and 50" Vizio plasma too. It appears to trip some people up. Usually No Signal appears at least...

                The tv has examined by some one. He said main board needs replaced. owner brought to me. I am confused Tom

                Comment

                  #9
                  Re: Problem with Vizio LCD VX37L HDTV

                  I'm guessing they never checked it with an input.
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                  Comment

                    #10
                    Re: Problem with Vizio LCD VX37L HDTV

                    Do you believe it? Now I remove all input It stay with blue screen no sign of "no input" on screen.I already unplug AC.

                    Comment

                      #11
                      Re: Problem with Vizio LCD VX37L HDTV

                      OK, I'm not seeing a problem here. It's just giving you more time if you unplug it while it is running.
                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                      Comment

                        #12
                        Re: Problem with Vizio LCD VX37L HDTV

                        OK Tom. I will unplug it and let you know.

                        Comment

                          #13
                          Re: Problem with Vizio LCD VX37L HDTV

                          No different , TV works ok. With hdmi and avi.

                          Comment

                            #14
                            Re: Problem with Vizio LCD VX37L HDTV

                            And the fault is??
                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

                              #15
                              Re: Problem with Vizio LCD VX37L HDTV

                              Originally the TV would turn off after 6 seconds.

                              Now with a input connected it stays on and displays the input correctly

                              It is working , there is no problem?
                              Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

                              Comment

                                #16
                                Re: Problem with Vizio LCD VX37L HDTV

                                Originally posted by cashkennedy View Post
                                Originally the TV would turn off after 6 seconds.

                                Now with a input connected it stays on and displays the input correctly

                                It is working , there is no problem?
                                At the beginning

                                I did not connect avi or hdmi but I did connect air antenna.TV shutdown after 6 seconds. Tv did not response to input button.
                                Last edited by hienton2; 05-30-2013, 03:52 PM.

                                Comment

                                  #17
                                  Re: Problem with Vizio LCD VX37L HDTV

                                  And you now have confused two people, because neither us know if the TV is actually working for you or if you are complaining about a fault. Please clear this up.
                                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                  Comment

                                    #18
                                    Re: Problem with Vizio LCD VX37L HDTV

                                    Originally posted by tom66 View Post
                                    And you now have confused two people, because neither us know if the TV is actually working for you or if you are complaining about a fault. Please clear this up.

                                    Hi Tom.
                                    I am happy to have help from Supper techs here.
                                    All I did I already showed every post from the first one.I am confused too.I can not find out the cause. In experience sometimes we remove and install board
                                    then tv fixed without doing anything. But this one I did not remove the main board.

                                    TV is OK now.
                                    Last edited by hienton2; 05-30-2013, 04:07 PM.

                                    Comment

                                      #19
                                      Re: Problem with Vizio LCD VX37L HDTV

                                      And now in the end TV works good for antenna, hdmi , and avi?

                                      Congratulations, enjoy!

                                      From what I can tell it was just the 6 seconds with no input causing it to shut off. It would not switch inputs maybe because it was shutting off to fast / or it didn't sense the antenna input?
                                      Last edited by cashkennedy; 05-30-2013, 04:07 PM.
                                      Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

                                      Comment

                                        #20
                                        Re: Problem with Vizio LCD VX37L HDTV

                                        I had a 37" Vizio with a similar problem. Turned out to be the main board at fault. There will be a delay when the Tv is turned on before you can access the OSD menu or change the input. After replacing the main board the delay problem was fixed.

                                        Usually with the RGB input itll shut off if there is no input. So if it shuts off and turned back on with no inputs there will be a delay that will prevent you from accessing or changing the input and itll shut off once again and youll be stuck in this loop.

                                        Comment

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