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Vizio GV47LFHDTV10A No Picture No Sound Fix

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    #41
    Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

    Originally posted by bleed4me View Post
    Are you referring to pin 1 on the main board that gives the signal to BL-ON on the power supply board?
    I am talking about checking the LDO Voltage regulator ICs 3-pin device.
    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


      #42
      Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

      First I just want to say hats off to budm for his thread /tutorial for Voltage Regulator (LDO) testing, thats good reading right there so thank you for that. So I tested the voltages then checked then rechecked just to make sure. As far as the part number I did the best I could that wasnt an easy task. There were some that had a backwards C so I will use " ) " in its place. If there are any you want me to recheck please let me know and I will get right on it. Also if the format is incorrect please let me know. Thanks

      U4
      )117BB
      17-33L
      PIN 1=0
      PIN 2=4.06
      PIN 3=6.30

      U5
      AMC1117
      F0720F
      PIN 1=.56
      PIN 2=1.56
      PIN 3=4.02

      U6
      )117BB
      17-33L
      PIN 1=0
      PIN 2=3.76
      PIN 3=5.85

      U8
      )117BB
      17-33L
      PIN 1=0
      PIN 2=4.07
      PIN 3=6.24

      U9
      AMC1117
      18F0641J
      PIN1= 0
      PIN 2= 2.16
      PIN 3= 3.98

      U10
      AMC1117
      18F0641J
      PIN 1= 0
      PIN 2= 2.18
      PIN 3=4.01

      U7
      AMC1117
      18F0641J
      PIN 1= 0
      PIN 2=2.15
      PIN 3= 3.96

      U18
      AMC1117
      F0720F
      PIN 1= .29
      PIN 2= 1.78
      PIN 3= 3.92

      DU2
      )117BB
      17-33L
      PIN 1=0
      PIN 2= 3.88
      PIN3=5.96

      DU3
      )116LC
      17-25L
      PIN 1=0
      PIN 2=2.9
      PIN 3=5.86

      DU4
      AMC1117
      F0720F
      PIN 1= 0
      PIN 2=.78
      PIN 3= 3.83

      U16
      )116LC
      17-25L
      PIN 1=0
      PIN 2=2.88
      PIN 3=5.82

      Comment


        #43
        Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

        There are many readings. you need to check your meter first and make sure the batteries are good and the setting is set to DCV.

        U4 Bad, it is 3.3V regulator, you are getting 4.06V
        )117BB
        17-33L
        PIN 1=0
        PIN 2=4.06
        PIN 3=6.30

        U5 Bad, 1.25V ref +0.56 = 1.81
        AMC1117
        F0720F
        PIN 1=.56
        PIN 2=1.56
        PIN 3=4.02

        U6 Bad, it is 3.3V regulator
        )117BB
        17-33L
        PIN 1=0
        PIN 2=3.76
        PIN 3=5.85

        U8 Bad, it is 3.3V regulator
        )117BB
        17-33L
        PIN 1=0
        PIN 2=4.07
        PIN 3=6.24

        U9 Odd output Voltage
        AMC1117
        18F0641J
        PIN1= 0
        PIN 2= 2.16
        PIN 3= 3.98

        U10, Odd output Voltage
        AMC1117
        18F0641J
        PIN 1= 0
        PIN 2= 2.18
        PIN 3=4.01

        U7
        AMC1117
        18F0641J
        PIN 1= 0
        PIN 2=2.15
        PIN 3= 3.96

        U18 Bad, 1.25V ref + 0.29 = 1.54
        AMC1117
        F0720F
        PIN 1= .29
        PIN 2= 1.78
        PIN 3= 3.92

        DU2 Bad, it is 3.3V reg.
        )117BB
        17-33L
        PIN 1=0
        PIN 2= 3.88
        PIN3=5.96

        DU3 Bad, it is 3.3V reg.
        )116LC
        17-25L
        PIN 1=0
        PIN 2=2.9
        PIN 3=5.86

        DU4
        AMC1117
        F0720F
        PIN 1= 0
        PIN 2=.78
        PIN 3= 3.83

        U16
        )116LC
        17-25L
        PIN 1=0
        PIN 2=2.88
        PIN 3=5.82
        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


          #44
          Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

          Great thread!

          Comment


            #45
            Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

            Ok just replaced the battery with a brand new one and did some retesting... Just redid all the values, sorry about this... what a difference a new battery makes! Thank you for the suggestion



            U4
            )117BB
            17-33L
            PIN 1=0
            PIN 2=3.35
            PIN 3=5.21

            U5
            AMC1117
            F0720F
            PIN 1=.46
            PIN 2=1.29
            PIN 3=3.35

            U6
            )117BB
            17-33L
            PIN 1=0
            PIN 2=3.33
            PIN 3=5.21

            U8
            )117BB
            17-33L
            PIN 1=0
            PIN 2=3.35
            PIN 3=5.15

            U9
            AMC1117
            18F0641J
            PIN1= 0
            PIN 2= 1.81
            PIN 3= 3.35

            U10
            AMC1117
            18F0641J
            PIN 1= 0
            PIN 2= 1.81
            PIN 3=3.35

            U7
            AMC1117
            18F0641J
            PIN 1= 0
            PIN 2=1.81
            PIN 3= 3.35

            U18
            AMC1117
            F0720F
            PIN 1= .25
            PIN 2= 1.51
            PIN 3= 3.35

            DU2
            )117BB
            17-33L
            PIN 1=0
            PIN 2= 3.32
            PIN3=5.12

            DU3
            )116LC
            17-25L
            PIN 1=0
            PIN 2=2.52
            PIN 3=5.12

            DU4
            AMC1117
            F0720F
            PIN 1= 0
            PIN 2=.66
            PIN 3= 3.32

            U16
            )116LC
            17-25L
            PIN 1=0
            PIN 2=2.52
            PIN 3=5.14
            Last edited by bleed4me; 02-03-2016, 09:07 PM.

            Comment


              #46
              Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

              U4 OK, 3.3V REG
              )117bb
              17-33l
              pin 1=0
              pin 2=3.35
              pin 3=5.21

              u5 Bad, 1.25v ref + 0.46adj = 1.71V, you have 1.29V Out.
              amc1117
              f0720f
              pin 1=.46
              pin 2=1.29
              pin 3=3.35

              u6: OK, 3.3V REG
              )117bb
              17-33l
              pin 1=0
              pin 2=3.33
              pin 3=5.21

              u8: OK, 3.3V Vreg
              )117bb
              17-33l
              pin 1=0
              pin 2=3.35
              pin 3=5.15

              u9:OK, 1.8V Vreg
              amc1117
              18f0641j
              pin1= 0
              pin 2= 1.81
              pin 3= 3.35

              u10: OK, 1.8V Vreg
              amc1117
              18f0641j
              pin 1= 0
              pin 2= 1.81
              pin 3=3.35

              u7: OK, 1.8V Vreg
              amc1117
              18f0641j
              pin 1= 0
              pin 2=1.81
              pin 3= 3.35

              u18: OK, 1.25Vref + 0.25Vadj = 1.50Vout
              amc1117
              f0720f
              pin 1= .25
              pin 2= 1.51

              pin 3= 3.35

              du2: OK, 3.3V Vreg
              )117bb
              17-33l
              pin 1=0
              pin 2= 3.32
              pin3=5.12

              du3: OK, 2.5V Vreg
              )116lc
              17-25l
              pin 1=0
              pin 2=2.52
              pin 3=5.12

              du4 Bad. This one needs verification on the P/N
              . Output cannot be lower than Vref which is 1.25V.
              amc1117
              f0720f
              pin 1= 0
              pin 2=.66
              pin 3= 3.32

              u16: OK, 2.5V Vreg
              )116lc
              17-25l
              pin 1=0
              pin 2=2.52
              pin 3=5.14
              Last edited by budm; 02-04-2016, 12:32 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


                #47
                Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                Rechecked DU4


                DU4
                AMC1117
                F0720F
                PIN 1= 0
                PIN 2=.67
                PIN 3= 3.32

                Comment


                  #48
                  Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                  Originally posted by bleed4me View Post
                  Rechecked DU4


                  DU4
                  AMC1117
                  F0720F
                  PIN 1= 0
                  PIN 2=.67
                  PIN 3= 3.32
                  Can I get good closed up pictures of this DU4 so I can see how the 3 legs are connected?
                  Looking at this picture: https://www.badcaps.net/forum/attach...6&d=1454392483
                  The DU4 looks to be an Adjustable 1117.
                  Last edited by budm; 02-04-2016, 09:39 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


                    #49
                    Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                    Absolutely... As soon as I get off work I will get those pictures posted for you.

                    Comment


                      #50
                      Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                      Getting that picture was trickier than I thought it would be. Things sure do look different when under a magnifying glass. I also figured I would put DU1 on the list as well being that I left it out

                      DU1
                      AZ7805T
                      E1
                      718G70
                      PIN 1= 11.86
                      PIN 2=0
                      PIN 3= 5.06

                      I also rechecked the voltages on DU4 and nothing as changed.
                      Attached Files

                      Comment


                        #51
                        Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                        My working set has the following readings for DU4

                        Pin1: 0.0v
                        Pin 2:1.24V
                        Pin3: 3.3v

                        Pin 2 is off for you. It doesn't look adjustable. DL6 and DCE11 are on that same 1.24 volt line. Make sure those are ok.
                        Last edited by Nick's Tvs; 02-04-2016, 07:50 PM.

                        Comment


                          #52
                          Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                          Well I can tell you that DL6 has continuity and .66V on either side and my multimeter has no way to test a capacitor, visually it looks fine thats all I can say.

                          Comment


                            #53
                            Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                            DU4 is an adjustable based on the two resistor network (one between ADJ and the Output pin, Resistor DR6, and another resistor between ADJ pin and GND, DR10).
                            The output Voltage can be calculated by knowing the values of those two resistors.
                            Last edited by budm; 02-04-2016, 10:40 PM.
                            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


                              #54
                              Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                              So are you thinking its the resistors or the regulator?

                              Comment


                                #55
                                Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                                The resistors are for setting the output Voltage, it will be the IC.
                                You need to get at least two adj type 1117 Regulator ICs (U5 , DU4).
                                Tricky part will be removing and installing the ICs without disturbing the resistors and caps closed by, so I hope you are good at surface mount repair.
                                Last edited by budm; 02-04-2016, 11:03 PM.
                                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


                                  #56
                                  Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                                  There is only one way to find out I guess
                                  does this link look about right?
                                  http://www.digikey.com/product-detai...4-5-ND/1677149
                                  or
                                  http://www.digikey.com/product-detai...3PBF-ND/890204
                                  Last edited by bleed4me; 02-04-2016, 11:17 PM.

                                  Comment


                                    #57
                                    Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                                    Either one will be fine.
                                    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


                                      #58
                                      Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                                      Parts have been ordered, will report back with results as soon as they come in.

                                      Comment


                                        #59
                                        Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                                        BTW, can you take the resistance reading between pin 2 and GND of DU4?
                                        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


                                          #60
                                          Re: Vizio GV47LFHDTV10A No Picture No Sound Fix

                                          As soon as I get home I can get that for you... This wouldn't be about amp rating on that ic would it?
                                          Last edited by bleed4me; 02-05-2016, 10:27 AM.

                                          Comment

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