Need help with Vizio E3D470VX

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  • joeshannallie
    Senior Member
    • Dec 2013
    • 103
    • usa

    #1

    Need help with Vizio E3D470VX

    Picked up a Vizio E3D470VX and the guy said he heard a pop and that was it. Well when I push the power button the Vizio logo will come up and go right back off. Can still turn it off and on with power button. Took the back off and this is what I found. The mosfet is popped open and apart. Could this be the problem? The number on the mosfet is NDF05N50ZG. I looked the part number up and this is what I found that it is a MOSFET NFET T0220FP 500V 5A 1.5R. Can someone search on radioshack.com for mosfet 500v and see if what they have will work. Please reply soon.
    Attached Files
  • MagicSmoke
    Badcaps Veteran
    • Feb 2011
    • 275
    • USA

    #2
    Re: Need help with Vizio E3D470VX

    Digikey has the exact part you need. http://www.digikey.com/product-searc...GOS-ND&stock=1

    .94$ for one.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Need help with Vizio E3D470VX

      You need to find out if the Gate drive circuit is direct drive to those two MOSFETs, if it is, then you will need to replace the driver IC and the Gate drive components.
      You need to check them out real well otherwise you will blow up your new parts.
      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

      • joeshannallie
        Senior Member
        • Dec 2013
        • 103
        • usa

        #4
        Re: Need help with Vizio E3D470VX

        Would you care to give some advice on how to do what you are saying? It would be much appreciated.

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 7967
          • Canada

          #5
          Re: Need help with Vizio E3D470VX

          post a pic of the back side of your board.

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: Need help with Vizio E3D470VX

            Good clear straight shot pictures of the whole board, both sides.
            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

            • joeshannallie
              Senior Member
              • Dec 2013
              • 103
              • usa

              #7
              Re: Need help with Vizio E3D470VX

              Here is the pic, best I could do. No burnt marks or anything on the back side of the board.

              Comment

              • joeshannallie
                Senior Member
                • Dec 2013
                • 103
                • usa

                #8
                Re: Need help with Vizio E3D470VX

                Lets try again.
                Attached Files
                Last edited by joeshannallie; 02-16-2015, 08:42 PM.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Need help with Vizio E3D470VX

                  My post #6 "Good clear straight shot pictures of the whole board, both sides."
                  I need to be able to see the traces so I can trace the connections from point A to point B,
                  I do not have the board in front of me to see.

                  What can be done when good clear pictures are provided:
                  https://www.badcaps.net/forum/showpo...5&postcount=35
                  https://www.badcaps.net/forum/showpo...9&postcount=12
                  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

                  • joeshannallie
                    Senior Member
                    • Dec 2013
                    • 103
                    • usa

                    #10
                    Re: Need help with Vizio E3D470VX

                    I will upload some better ones in a few minutes.

                    Comment

                    • joeshannallie
                      Senior Member
                      • Dec 2013
                      • 103
                      • usa

                      #11
                      Re: Need help with Vizio E3D470VX

                      This the best I can get, I really appreciate you Bud
                      Attached Files

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Need help with Vizio E3D470VX

                        OK, it is transformer coupling for driving the MOSFETs, on the GATE pin, there are 3 components (2 resistors, 1 diode)connected to it, check them out.
                        Look up the spec of the MOSFET to get the pinout.
                        BTW, there are FOUR MOSFETs,
                        Too bad they install a jumper wire in place of the fuse F400 which feeds B+ to that inverter circuit.
                        Last edited by budm; 02-16-2015, 10:05 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

                        • joeshannallie
                          Senior Member
                          • Dec 2013
                          • 103
                          • usa

                          #13
                          Re: Need help with Vizio E3D470VX

                          Replaced the mosfet and it still has the same problem. When you first turn it on the Vizio logo will appear and then it is gone. But the screen seems to not light all the way up. Then a few seconds later the screen will light back up and then go right back off. You can turn it off and on with the remote. Does anyone have any ideas. Could it be the main board or a tab bond issue. If it was a tab issue would the screen stay lit and on?

                          Comment

                          • CapLeaker
                            Leaking Member
                            • Dec 2014
                            • 7967
                            • Canada

                            #14
                            Re: Need help with Vizio E3D470VX

                            the LCD and the backlight are 2 different circuits. Hook up your meter to the brown big 450V cap, turn the TV on and see what it does. It should have 170V then ramp up to 380V. That indicates the PFC is working.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Need help with Vizio E3D470VX

                              Originally posted by budm
                              OK, it is transformer coupling for driving the MOSFETs, on the GATE pin, there are 3 components (2 resistors, 1 diode)connected to it, check them out.
                              Look up the spec of the MOSFET to get the pinout.
                              BTW, there are FOUR MOSFETs,
                              Too bad they install a jumper wire in place of the fuse F400 which feeds B+ to that inverter circuit.
                              Originally posted by joeshannallie
                              Replaced the mosfet and it still has the same problem. When you first turn it on the Vizio logo will appear and then it is gone. But the screen seems to not light all the way up. Then a few seconds later the screen will light back up and then go right back off. You can turn it off and on with the remote. Does anyone have any ideas. Could it be the main board or a tab bond issue. If it was a tab issue would the screen stay lit and on?
                              So what happen to the MOSFETs and the Gate components testing?
                              Last edited by budm; 03-02-2015, 11:25 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

                              • joeshannallie
                                Senior Member
                                • Dec 2013
                                • 103
                                • usa

                                #16
                                Re: Need help with Vizio E3D470VX

                                Sorry Bud but I dont really understand how to test what you are telling me to test.

                                Comment

                                • CapLeaker
                                  Leaking Member
                                  • Dec 2014
                                  • 7967
                                  • Canada

                                  #17
                                  Re: Need help with Vizio E3D470VX

                                  That mosfet you changed out, download the data sheet and see on which pin the "gate" is. Look that up on your board. There are components inline. Resistors, diode etc that go back the driver IC. If a gate circuit component is bad, the mosfet simply won't work. Verify the resistor values, what's printed on it, to what it actually measures. So usually resistors either go open or get higher resistor value, that's bad. Diode usually shorts or gets leaky, that's bad too.
                                  Budm told you already what to check, read post #12 again. You may have to "lift" one leg to get good measurement out of circuit.

                                  Comment

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