VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no picture

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  • triplefour
    Badcaps Legend
    • May 2014
    • 1747
    • USA

    #101
    Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

    again why cant we find a diagram for this board? it should be a crime not to make these schematics freely availiable
    Don't fear the repair...

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #102
      Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

      OK, just do more resistance probing.
      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

      • triplefour
        Badcaps Legend
        • May 2014
        • 1747
        • USA

        #103
        Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

        maybe it is out there somewhere...but i just cant google good enough :'(
        Don't fear the repair...

        Comment

        • triplefour
          Badcaps Legend
          • May 2014
          • 1747
          • USA

          #104
          Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

          ok which resistances should i check now? can i forget about the mx12g?
          should i put one probe on j30 and just go crazy probing everything in sight and then write down all the values and label them on the picture?
          Don't fear the repair...

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #105
            Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

            I wonder what the repair kit is?
            http://www.ebay.com.au/itm/VIZIO-Mai...-/131030297620
            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

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #106
              Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

              Originally posted by triplefour
              ok which resistances should i check now? can i forget about the mx12g?
              should i put one probe on j30 and just go crazy probing everything in sight and then write down all the values and label them on the picture?
              That's about the only way.
              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

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #107
                Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                Well here is the stupid Vizio service manual, NO DIAGRAM!
                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

                • triplefour
                  Badcaps Legend
                  • May 2014
                  • 1747
                  • USA

                  #108
                  Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                  yeah i was complaining about that earlier. i looked at it and found it completely worthless
                  Don't fear the repair...

                  Comment

                  • triplefour
                    Badcaps Legend
                    • May 2014
                    • 1747
                    • USA

                    #109
                    Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                    ok well it took a lot of time but i made pretty much all the measurements i could stand. writing them down on the picture now. gimme a minute.
                    Don't fear the repair...

                    Comment

                    • triplefour
                      Badcaps Legend
                      • May 2014
                      • 1747
                      • USA

                      #110
                      Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                      i measured some resistances lower down on the board than whats shown in this picture. ill have to take another picture to show it.
                      but heres what i got so far.
                      Attached Files
                      Don't fear the repair...

                      Comment

                      • triplefour
                        Badcaps Legend
                        • May 2014
                        • 1747
                        • USA

                        #111
                        Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                        heres the other part
                        Attached Files
                        Don't fear the repair...

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #112
                          Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                          OK, on post 86 you said you read 0.03 Ohms on two pads of MX-12g, now you showing the reading of 1506 ans also show 889 for the pad of c858 wwich is connected directly to those two pad of MX-12G, that cnnot be right.
                          But no matter what, that IC is NOT the MOSFET we are looking for, do not waste any more time testing that IC. You need to probe other components.
                          Your Ohm readings are not consistence as you can see you are reading the same connection but comes up with different readings.
                          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

                          • triplefour
                            Badcaps Legend
                            • May 2014
                            • 1747
                            • USA

                            #113
                            Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                            ok in post 86 i think there was some miscommunication. now that im re-reading it. you wanted me to put one probe on j30 and test those points. but i was testing between pin1 of the mx-12g and the other 2 points circled. thats when i got the .03 resistances.

                            later when i tested everything from the j30 i went over and over double checking to make sure. so those are assuredly the resistances from j30.

                            sorry for the confusion.

                            did i still not probe enough stuff? what else should i try? what am i looking for? to find something going from j30 that has .03 resistance?
                            Don't fear the repair...

                            Comment

                            • triplefour
                              Badcaps Legend
                              • May 2014
                              • 1747
                              • USA

                              #114
                              Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                              idk how but i think i just didnt see the post u made directly before me on that one...im gonna test resistance between j30 and any mosfet type looking things. looking for low resistance...
                              Don't fear the repair...

                              Comment

                              • triplefour
                                Badcaps Legend
                                • May 2014
                                • 1747
                                • USA

                                #115
                                Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                                ok so with the black probe on j30 i ran the red probe all over the place...i dont think i tested every mosfet on the board but every one in that area for sure. and i only found this one that has .4 ohms resistance on 4 legs

                                i circled it in the picture.
                                4853GM
                                908034

                                or is it
                                4B53GM
                                908031

                                ?

                                so is this the MOSFET we're looking for, obi?
                                Attached Files
                                Don't fear the repair...

                                Comment

                                • triplefour
                                  Badcaps Legend
                                  • May 2014
                                  • 1747
                                  • USA

                                  #116
                                  Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                                  oh yeah im also wondering (and should have asked earlier) how you know that j30 is supposed to be 12v when we dont have a schematic? is that just how most vizios are?
                                  Don't fear the repair...

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #117
                                    Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                                    OK that may be it! Take the DCV reading on the 4 pin on the right, the two pin (pin 1 and pin 3, you can see that they are connected to positive pin of cap CE64 ) should have 12VDC.
                                    Give me the reading of all 4 pins on the right (pin 1 ~4).
                                    "oh yeah im also wondering (and should have asked earlier) how you know that j30 is supposed to be 12v when we dont have a schematic? is that just how most vizios are?" Just from experience, other TV may not used other pins, when you work on many units as I have, you will kind of know which pin will be for the b+.
                                    P/N is AP4853GM
                                    Last edited by budm; 05-15-2014, 10:55 AM.
                                    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

                                    • triplefour
                                      Badcaps Legend
                                      • May 2014
                                      • 1747
                                      • USA

                                      #118
                                      Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                                      ok ill go take those measurements now. what do u mean by b+ ?
                                      Don't fear the repair...

                                      Comment

                                      • triplefour
                                        Badcaps Legend
                                        • May 2014
                                        • 1747
                                        • USA

                                        #119
                                        Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                                        its for the pins on the right from top to bottom 11.95 , 12.05, 11.95, 12.05 ...
                                        Don't fear the repair...

                                        Comment

                                        • budm
                                          Badcaps Legend
                                          • Feb 2010
                                          • 40746
                                          • USA

                                          #120
                                          Re: VIZIO V037L FHDTV20A powers up, backlight on, sound works, buttons work, no pict

                                          Just to be sure, the 4 pin (all tied together on the pad) on the left has 0v or near 0V?
                                          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

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