Vizio E400I-B2 powering on problem

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #21
    Re: Vizio E400I-B2 powering on problem

    OK, that means the 32VDC is normal then,, those caps are the filter caps for the output of the Boost converter circuit that boosts the incoming 24VDC to higher level for running the LED string, and you are getting about 8VDC on the Cathode side of each LED strings so it sounds like the MOSFET for each of the LED current return lines are not being turned on.
    Last edited by budm; 01-06-2017, 01:56 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

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #22
      Re: Vizio E400I-B2 powering on problem

      What is the LCD panel model number? There should be a sticker some where on the back of the panel.
      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

      • CapLeaker
        Leaking Member
        • Dec 2014
        • 7971
        • Canada

        #23
        Re: Vizio E400I-B2 powering on problem

        May not be just like the other one a while back with the missing BLon signal?

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: Vizio E400I-B2 powering on problem

          I believe I saw another thread with similar board that I could find out which pin are for BL-ON, Dimming, etc. I think the BL-ON is present otherwise he will not have that boosted 32VDC.
          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

          • nwcs
            Badcaps Veteran
            • Dec 2015
            • 311
            • usa

            #25
            Re: Vizio E400I-B2 powering on problem

            I have the exact same results with the exact same model tv. I do not think the led's are the problem. I believe the main board is the culprit. I Checked voltages on cn201 both while on and while powering on.
            while on: 1 and 2 are 5v, 3 is 3.3v and all of the 12v are 0v.
            While powering on the 12v all read 12v then go down.
            Attached Files

            Comment

            • nwcs
              Badcaps Veteran
              • Dec 2015
              • 311
              • usa

              #26
              Re: Vizio E400I-B2 powering on problem

              I forgot to mention pin 4 is 0v while on and 3v when turned on.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #27
                Re: Vizio E400I-B2 powering on problem

                So you do have PS-ON (3 VDC) on pin 4 when TV is turned on but you are not getting the switched 12 Vdc, you have problem with the power supply.
                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

                • nwcs
                  Badcaps Veteran
                  • Dec 2015
                  • 311
                  • usa

                  #28
                  Re: Vizio E400I-B2 powering on problem

                  Just tested all of the LED's and all lit up fine. I am leaning on a bad main board.

                  Comment

                  • nwcs
                    Badcaps Veteran
                    • Dec 2015
                    • 311
                    • usa

                    #29
                    Re: Vizio E400I-B2 powering on problem

                    I get 12v when turned on but then it goes to 0v.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #30
                      Re: Vizio E400I-B2 powering on problem

                      If pin 4 3V is present and stays at 3V or so but the switched 12V drops out then you need to check that 12V section to see if it being loaded down, or bad parts, etc.
                      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

                      • nwcs
                        Badcaps Veteran
                        • Dec 2015
                        • 311
                        • usa

                        #31
                        Re: Vizio E400I-B2 powering on problem

                        So you are saying power supply. I will check in the morning.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #32
                          Re: Vizio E400I-B2 powering on problem

                          We need good clear straight shot pictures of your power supply board top side and the bottom side.
                          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

                          • CapLeaker
                            Leaking Member
                            • Dec 2014
                            • 7971
                            • Canada

                            #33
                            Re: Vizio E400I-B2 powering on problem

                            or something connected to the 12V rail on the PSU loading it down.

                            Comment

                            • TheCockroach
                              Member
                              • Sep 2015
                              • 34
                              • United States

                              #34
                              Re: Vizio E400I-B2 powering on problem

                              Originally posted by nwcs
                              I have the exact same results with the exact same model tv. I do not think the led's are the problem. I believe the main board is the culprit. I Checked voltages on cn201 both while on and while powering on.
                              while on: 1 and 2 are 5v, 3 is 3.3v and all of the 12v are 0v.
                              While powering on the 12v all read 12v then go down.
                              Kind of good to know that I'm not the only one with this problem, but it also kinda sucks. Means there's probably a lot of others as well, as it may just be an inherent flaw with this particular model.

                              Originally posted by budm
                              We need good clear straight shot pictures of your power supply board top side and the bottom side.
                              Maybe I should leave the picture taking to nwcs, since it'd seem my camera produces really poor quality results. if he can't get back to us with some, then I'll borrow a friends phone to take pics with instead.

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #35
                                Re: Vizio E400I-B2 powering on problem

                                So did you at least check the resistance of the 12V pin against GND to see if it shows really low resistance?
                                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

                                • TheCockroach
                                  Member
                                  • Sep 2015
                                  • 34
                                  • United States

                                  #36
                                  Re: Vizio E400I-B2 powering on problem

                                  Originally posted by budm
                                  So did you at least check the resistance of the 12V pin against GND to see if it shows really low resistance?
                                  Which board is that on again btw, the main board (aka, same one that I took the LED measurements off of, or..) ?

                                  Comment

                                  • nwcs
                                    Badcaps Veteran
                                    • Dec 2015
                                    • 311
                                    • usa

                                    #37
                                    Re: Vizio E400I-B2 powering on problem

                                    It has been off my bench for a while but I think it was the power supply.

                                    Comment

                                    • nwcs
                                      Badcaps Veteran
                                      • Dec 2015
                                      • 311
                                      • usa

                                      #38
                                      Re: Vizio E400I-B2 powering on problem

                                      OK, I have three of these TV's in same issue. I got a used main board off ebay and still have same problem. I did check to see if there was anything displayed on the screen (hit the menu button and used a flashlight to look) and there is nothing. I have verified all led's are at least lighting and the measurements were taken off of the power supply.

                                      Comment

                                      • TheCockroach
                                        Member
                                        • Sep 2015
                                        • 34
                                        • United States

                                        #39
                                        Re: Vizio E400I-B2 powering on problem

                                        Originally posted by nwcs
                                        OK, I have three of these TV's in same issue. I got a used main board off ebay and still have same problem. I did check to see if there was anything displayed on the screen (hit the menu button and used a flashlight to look) and there is nothing. I have verified all led's are at least lighting and the measurements were taken off of the power supply.
                                        Any word from your end, about what the problem with these TV's was/is, by chance..?

                                        Comment

                                        • nwcs
                                          Badcaps Veteran
                                          • Dec 2015
                                          • 311
                                          • usa

                                          #40
                                          Re: Vizio E400I-B2 powering on problem

                                          Sorry, I thought I had already posted the repair. On this model it ended up being the power supply had failed, just like budm had thought. I had a E420i-A0 with almost the same problem and it ended up being the main board.

                                          Comment

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