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    vizio dead set

    Kinda new to this so bare with me. This is a vizio E420V0. Completely dead,no power light,nothing. On the main board,"3642-0972-0150(41)" the 3v nano fuse is blown. From the fuse through a cap goes to u6 a IC or eeprom.not sure what it is. If I'm doing this correct with meter in diode mode. From pin one to last pin"straight across" It shows shorted. Thinking this is what I need to replace. I can't find it. The part number is LA8004PG AN08. I'm I on the right track.
    Attached Files

    #2
    Re: vizio dead set

    https://www.badcaps.net/forum/attach...1&d=1516135770
    Are you saying that the white fuse by the connector of the main board that goes to the power supply is blown?
    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


      #3
      Re: vizio dead set

      No it the little gray nano fuse.right below the cable from the power supply. They are two fuse's one is 5v other is 3v.

      Comment


        #4
        Re: vizio dead set

        I believe that ic is similar to a ap3435, pin 1 (Vcc) can be connected to pin 8 (Vin), It is a step down converter from 2.7v to 5.5v input to 1.2 volts output on pin 7, check if pin 1,8 or7 are shorted to ground (pin3 & 6)
        Last edited by R_J; 01-16-2018, 04:14 PM.

        Comment


          #5
          Re: vizio dead set

          Main board:
          http://assets.shopjimmy.com/media/ca...0150-top_5.jpg

          Power supply board:
          http://assets.shopjimmy.com/media/ca...1030-top_4.jpg

          The two fuses on the main board:
          F1 is for the 5V STBY, that 5VSTBY is fed to many circuits on the main board so shorts circuits can be any where that the 5VSTBY is connected to.
          F2 is for switched 12V.
          Last edited by budm; 01-16-2018, 04:20 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


            #6
            Re: vizio dead set

            Pins3,6 and 7 show ground

            Comment


              #7
              Re: vizio dead set

              All voltages are good on power board. Is u6 an IC ? No voltage on any pin just as I suspect because fuse blown.

              Comment


                #8
                Re: vizio dead set

                Ok I didn't have a 3v nano fuse so I used a jumper wire. I now have back light but it is flickering really fast. Anyone have any ideas. Also will not shut off with power button.

                Comment


                  #9
                  Re: vizio dead set

                  Yes u6 is an ic, it is a stepdown converter (post#4) What voltages do you have on its pins? Does it get hot to the touch?

                  Comment


                    #10
                    Re: vizio dead set

                    Does not get hot or warm.pin 1-5.07 pin2- is all over the place,but slowly goes to 0 pin 3 and 4 - .796 pin 5- 1.6 pin 6- .9 pin 7- 1.850 pin 8-5.14

                    Comment


                      #11
                      Re: vizio dead set

                      Because I am going by a different ic part number "ap3435" I can't be certain about what the exact output voltage on pin 7 should be, but it seems to be fine.
                      Pin 2 has no connection
                      pin 3 and 6 should be ground
                      See page 15 of the pdf
                      Attached Files
                      Last edited by R_J; 01-16-2018, 07:46 PM.

                      Comment


                        #12
                        Re: vizio dead set

                        Yes I agree,it seems fine now that I seen the data sheet. Thanks for the link. Are you familiar with u18. That is a eeprom right. I looked at the voltages and two of the pins have high fluctuations reading. Where can I find data sheets

                        Comment


                          #13
                          Re: vizio dead set

                          So right now the 5VSTBY Voltage is going up and down? and the resistance between GND and the jumper is?
                          You were using diode mode for checking for shorts:
                          Post# 1: 'If I'm doing this correct with meter in diode mode. From pin one to last pin"straight across" It shows shorted.' You should use Ohm mode instead.
                          Last edited by budm; 01-16-2018, 10:02 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


                            #14
                            Re: vizio dead set

                            5vstby is steady. As of now,when the set is plugged in. Black light starts flickering fast. Only way to shut the set off is to unplug. Voltages I was talking about going up and down is on u18, wich I believe is a eeprom.

                            Comment


                              #15
                              Re: vizio dead set

                              How about the shorts that you indicated in POST #1? What is the resistance reading?
                              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


                                #16
                                Re: vizio dead set

                                I guess I was doing it wrong. I was in diode mode. No sure how to check resistance in ohms. Ground to pin or pin one to each other pin . I would assume ground to pin.

                                Comment


                                  #17
                                  Re: vizio dead set

                                  Does anyone have any ideas on what would cause the back lights to flicker.I'm thinking it's in the main board because they start flickering as soon as the tv is plugged in ��

                                  Comment


                                    #18
                                    Re: vizio dead set

                                    You can test the power supply/inverter board by itself by disconnecting the cable between power supply board and the main board then use 1K resistor between 5V STBY and the PS-ON pin, another 1K resistor between 5VSTBY and the BL-ON (I ON-OFF) to force on the power supply and the backlights when AC is applied to the board, the backlights should come on and stay on as as as the AC is present. If the backlights still do not come on then you will need another 1K resistor between 5V stby and the DIM pin.
                                    Last edited by budm; 01-17-2018, 04:11 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


                                      #19
                                      Re: vizio dead set

                                      I don't have any resistors.I'll have to pick some up tomorrow and let you know how it goes. Thanks for the info.

                                      Comment


                                        #20
                                        Re: vizio dead set

                                        Was unable to find resistors.was thinking about robbing from old board.do you know the color code for 1k

                                        Comment

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