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Vizio e470vl has 2 seconds to black

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    #21
    Re: Vizio e470vl has 2 seconds to black

    all pins on u33 are 12.1v except pin 2 and 4 which are 0.02v
    Don't fear the repair...

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      #22
      Re: Vizio e470vl has 2 seconds to black

      Use your ohm meter and check resistance for U33
      Pin 1 to 8
      Pin 1 to 7
      Pin 3 to 5
      Pin 3 to 6
      Willing to help but I'm no expert.

      Comment


        #23
        Re: Vizio e470vl has 2 seconds to black

        all those measured 1.7 on the 2k ohm scale
        Don't fear the repair...

        Comment


          #24
          Re: Vizio e470vl has 2 seconds to black

          Originally posted by triplefour View Post
          DIM is still connected to the MB, i only pulled out one wire from the connector. the one for pin 13, LAMP
          and i have a 1k resistor jumping DIM and LAMP together at cn201
          But if the lamp wire is left floating without connected to anything and the rest of the wires are connected I would expect the backlights to come on and stay on also, is that true?
          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


            #25
            Re: Vizio e470vl has 2 seconds to black

            yea thats what i was hoping too since i seem to remember fixing a tv like that before... but no luck. that lamp pin has to read 2v or no dice. also if i try to jump it from 5vsb, it doesnt work.. so it cant be over a certain v either? without the SM they really got us working blind. i know i read somewhere in a thread on this tv about a guy that said he had jumpered all 3 of them together and was reading about 2v on each and the tv operated normally. DIM, LAMP, and INV on i think it was... but that didnt work for me. i got less than 2v on some of them when i did that
            Last edited by triplefour; 06-02-2016, 05:10 PM.
            Don't fear the repair...

            Comment


              #26
              Re: Vizio e470vl has 2 seconds to black

              so...does anyone have any insight as the safety of forcing a 2v signal onto the LAMP pin of the cn201 connector on the PSU? if i can do this safely without having to replace a component i can save everyone time and money.
              Don't fear the repair...

              Comment


                #27
                Re: Vizio e470vl has 2 seconds to black

                Originally posted by triplefour View Post
                so...does anyone have any insight as the safety of forcing a 2v signal onto the LAMP pin of the cn201 connector on the PSU? if i can do this safely without having to replace a component i can save everyone time and money.
                would using a fusible low amp resistor make it safer? as you friend dosnt want too spend too much if any money on this set.

                Comment


                  #28
                  Re: Vizio e470vl has 2 seconds to black

                  in my mind that would make it safer... good idea! but still would like to hear more on the subject! thank you
                  p.s. the guys gonna have to give me like 20$ at least even tho hes a friend... this is hours already!
                  Last edited by triplefour; 06-03-2016, 03:43 AM.
                  Don't fear the repair...

                  Comment


                    #29
                    Re: Vizio e470vl has 2 seconds to black

                    if you reconnect the tv wires back up how it should be are all the voltage regulators on the board testing correctly? as one maybe faulty ? causing this issue your having maybe worth a quick test too rule them all out.

                    Comment


                      #30
                      Re: Vizio e470vl has 2 seconds to black

                      well... i may do that eventually but i really think it cant be the motherboard since its producing the correct voltages...just when LAMP is plugged in, the 2.5v coming from the MB on pin13 drops to 0
                      Last edited by triplefour; 06-03-2016, 04:37 AM.
                      Don't fear the repair...

                      Comment


                        #31
                        Re: Vizio e470vl has 2 seconds to black

                        The 'LAMP ' line input pin on the MB has pull-up resistor to keep it HIGH when there is nothing connected to that 'LAMP' pin, the 'LAMP' pin on the power supply board is connected to a switched Transistor which is turned on if there is LAMP error detected which in turn will keep the 'LAMP' line low. If I am correct the LAMP line should be HIGH when no error detected, right now it is low and it is telling the MB that there is problem with the lamp circuit.
                        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


                          #32
                          Re: Vizio e470vl has 2 seconds to black

                          ok but when i trick it into working, the lamps all light up and i cant see that any one of them is bad... so how do i diagnose from here, whether its a problem on the psu or the lamps themselves?
                          Don't fear the repair...

                          Comment


                            #33
                            Re: Vizio e470vl has 2 seconds to black

                            So as I asked post #24, again, do the backlights stay on if you leave the LAMP wire not connected to anything but all other wires connected? We need to verify if the LAMP error is the one that causes the main board to shutdown, and also to verify if HIGH is normal and LOW is abnormal.
                            BTW, you should spend some of your times tracing out the LAMP pin 13 of the connector CN201 to see where it goes to, looking at it from the pictures from SJ, it looks like it is connected to the Collector of Q709, hard for me to see where else it goes to.
                            Also, what resistance do you get on the power supply board LAMP pin and GND pin of the connector?
                            http://www.shopjimmy.com/vizio-0500-...pply-unit.htm#
                            Vizio 0500-0407-0700 Power Supply / Backlight Inverter
                            Attached Files
                            Last edited by budm; 06-04-2016, 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


                              #34
                              Re: Vizio e470vl has 2 seconds to black

                              Originally posted by triplefour View Post
                              ok but when i trick it into working, the lamps all light up and i cant see that any one of them is bad... so how do i diagnose from here, whether its a problem on the psu or the lamps themselves?
                              You have two choices, try new power supply board, or take the panel apart to really see how all the lamps are.
                              All the functions of the TV works when the LAMP wire is not connected or tricked, right?
                              You can also dim the backlights level and the backlifgts still stay on, right?
                              Last edited by budm; 06-04-2016, 12:21 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


                                #35
                                Re: Vizio e470vl has 2 seconds to black

                                ok when i have the LAMP wire disconnected, but everything else connected normally, i still get 2 seconds to black. its only if i use 1k resistor between lamp and dim that i get functionality. this doesnt matter if lamp wire is connected or not. im not at the tv right now but ill try what you said when i get back to it. thanks!
                                p.s. taking apart the panel is out of the question. no way he's paying me enough for that. such a pain to take apart panels and so easy to break something!
                                Last edited by triplefour; 06-04-2016, 03:53 PM.
                                Don't fear the repair...

                                Comment


                                  #36
                                  Re: Vizio e470vl has 2 seconds to black

                                  when i had the tv tricked into working (all pins connected normal or with LAMP wire disconnected only, and 1k resistor between LAMP and DIM), i was able to adjust the backlight via menu
                                  Don't fear the repair...

                                  Comment

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