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Vizio VX37LHDTV10A

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    #21
    Re: Vizio VX37LHDTV10A

    OK, something get messed up even more.
    The 6v bulb it's working properly. Initially the 12v bulb worked OK too, but the 24v did not turn on.
    A transformer was buzzing, I think that the biggest was making that sound, then the 12v bulb lit up brightly and I measured 22.5v.
    I hope that I used the right bulbs, automotive bulbs. Maybe the bulbs were to powerful?
    I have used a power supply for the 3.3v, though I wasn't sure how much amps should be and I was trying different adjustments.

    Comment


      #22
      Re: Vizio VX37LHDTV10A

      Are you sure you did not hook up the 12v lamp to the 24v output, and the 24v lamps are hook up to the 12vdc instead? The 12v and the 24vdc are generated by the same transformer through two set of rectifier diodes. Please check your connection again for the lamps.
      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


        #23
        Re: Vizio VX37LHDTV10A

        I hooked them up correctly, right side two bulbs(2x12v), middle 1x12v and left side 1x6v bulb.
        I'm wondering if the 3.3v should be just a pulse or have to be held there constantly.
        I have just viewed a video on Youtube with a repairman talking about what to look for in a power supply and he said that when a transformer makes a buzzy sound(working on a lower frequency) that means that there is a short in the secondary.
        Now the question is what went out?
        The wattage of the bulbs matter?
        Last edited by tibimakai; 03-01-2012, 01:27 AM.

        Comment


          #24
          Re: Vizio VX37LHDTV10A

          Well I look at my board and also your picture, the middle and the right hand connectors are for 24vdc out, the left connector has the 12vdc out and 5vdcsb out.
          Please post the pictures of your setup.
          Attached Files
          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 VX37LHDTV10A

            By the way, those 1157 bulbs are low wattage:
            http://www.run-n-lites.com/bulbspec.asp
            Not enough to overload 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


              #26
              Re: Vizio VX37LHDTV10A

              I hooked it up right, I have used the 12v next to the 5v and the far right for 24v.
              I have used bulb #1004(12w).
              Right now I'm in the bed, but in the morning I will post a picture with the setup.

              Comment


                #27
                Re: Vizio VX37LHDTV10A

                I have just made the pictures:
                Attached Files

                Comment


                  #28
                  Re: Vizio VX37LHDTV10A

                  OK, you did hook it up correctly, that is how I test my. The PS_ON is a steady DC for the 12/24vdc to stay on, if you remove the 3.3v, then the 12/24v will go off. I use momentary push switch (Normally open) to activate/deactivate the P.S.
                  If you hear buzzing and wrong voltages, then there is problem in this section without even using full load, then we have to check more for where the problem is.
                  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


                    #29
                    Re: Vizio VX37LHDTV10A

                    initially I had the correct 12v, but after a couple of turn on/offs something happened.
                    it's interesting that without the bulbs, I had the 24v(haven't checked that since the bulb test if I still have it), how come?

                    Comment


                      #30
                      Re: Vizio VX37LHDTV10A

                      So on the 24v output, ypu do hsve 24vdc without the load, when you put the load on it, it drops down to nothing (lamps did not light up), then you do have the problem in the 24vdc output side which has rectifier diode, choke, caps, etc. Replacement board is about $50, we can try troubleshooting it further but it will be much easier if we have the daigram because we need to go deep down in the component level. If I have the board in front of me then it will be easier to reverse engineering it.
                      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


                        #31
                        Re: Vizio VX37LHDTV10A

                        I would like to fix it at component level, because I want to learn about fixing these TVs. I'm reading as much as I can and I may have to get some e-book or something like that to really know what I'm looking at.
                        I understand that this way it's hard to help me, but maybe you can explain to me usually which components are responsible for each voltage or anything that I should know about these power supplies.
                        When I was a teenager I have build my own bench adjustable power supply, but this is a totally different animal.
                        Slowly I'm getting all the tools I need to be able to work on these devices.
                        Recently I have got a Kendal 899D hot air station and it's pretty cool device.
                        I'm working on some Philips buffer boards, I'm replacing all 12 chips. Let's see how they will come out, first time I'm doing something like this.
                        I have got a power supply too, 0-30v, 0-5A.
                        So any help would be appreciated.

                        Comment


                          #32
                          Re: Vizio VX37LHDTV10A



                          Or GOOGLE "switching power supply tutorial"
                          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


                            #33
                            Re: Vizio VX37LHDTV10A

                            Tibi:
                            I'm not sure if this was addressed elsewhere on another thread but this sounds like a common problem that occurs in this model. I discovered this a couple of years ago after I had replaced the power supply board in a similar effort to troubleshoot. For some reason the VX37 has a tendency to get stuck on a non-active input source and shuts down at start up. The only thing that shows on the screen before shut down is a brief "no signal detected." I've managed to recover a couple of these same televisions by doing the following: either holding down the input button (on the tv) for 5 seconds prior to powering it up or by rapidly tapping the input button at the same time as you power it up. After I was able change the input source the TVs have worked ever since.

                            Comment


                              #34
                              Re: Vizio VX37LHDTV10A

                              Thank you for the tip. I would try it out, but something really went south in the power supply after poking in it. I have just ordered another one.
                              I'm in a similar situation with a Sony, that it was restarting a couple of times and then giving a ten blink code. I have reset the TV, applied the latest firmware and stopped doing that. Now I'm not sure if it's really fixed or not.
                              For now I'm using it and it's working fine, but I would like to sell it and I'm not sure if it's really fixed or not.

                              Comment


                                #35
                                Re: Vizio VX37LHDTV10A

                                I have got another PS from Ebay, everything looked OK, I mean I had the right voltages, except the 3.3V it was low with inverter board connected.
                                I have disconnected the inverter board and I had the 3.3V again.
                                I concluded that I have a problem on the inverter board.
                                Just before to finish up for today I said to myself, let's bouble check again the voltages.
                                Inverter board removed for testing, both 12/24V were gone again.
                                Now the Vizio logo turns to while and in like 30sec. turns orange again.
                                Ebay seller sent previously a dead PS, so now I have three and none of them are working.
                                I don't even know now that I have caused the PS failure or I should complain again to the seller.
                                I fill like I should just through it in the dumpster and be over with it. I'm pissed on this TV. I have $100 invested and I don't fill like spending more on this TV.
                                Any help would be appreciated.

                                Comment


                                  #36
                                  Re: Vizio VX37LHDTV10A

                                  budm, just that I understand correctly this bulb testing, I can leave on all the bulbs connected at the same time, plus the 3.3V PS-ON am I correct?

                                  Comment


                                    #37
                                    Re: Vizio VX37LHDTV10A

                                    I have purchased another PS and I got a DOA, it got replaced which seemed a good PS, but in a couple of minutes this one failed too. It was jamescindy7406 the Ebay ID.
                                    It's possible that something it's shorted on an other board and that short can blow the PS? When the second PS it was still working it seemed that the inverted board was causing the PS_ON voltage drop. Maybe my problem is on the inverter board?
                                    Could you please tell me which IC is the controller?
                                    thank you
                                    Last edited by tibimakai; 03-16-2012, 08:46 AM.

                                    Comment


                                      #38
                                      Re: Vizio VX37LHDTV10A

                                      I'm still trying to fix the original power supply.
                                      On the 12v rail without any load I have 13.3V and with load I have 21.7V.
                                      How is that possible?
                                      On the 24V rail I have 20.9V without load and 0V with load.
                                      Loads are bulbs.

                                      Comment


                                        #39
                                        Re: Vizio VX37LHDTV10A

                                        I have got a brand new power supply, hooked it up to the main board only, turned on the TV and for a couple of seconds the Vizio logo turned white and then back to orange.
                                        The power supply had all the right voltages for those couple of seconds, but I couldn't do anything in that short time, so I took out the power supply to test if out. I have pulled out my bulb tester and connected the 6V and the 24V bulbs and my power supply set to 3.3V which I have connected to PS-ON.
                                        The 6V bulb turned on just fine and the 24V was just blinking very dim and something shorted because I have smelled burnt smell.
                                        What is wrong here or what I'm doing wrong? It can't be that all four power supplies were bad. The first one the original, two from Ebay from the same seller and now a new Chinese.
                                        How can I be sure that my bulb tester is good and it's not the one causing all this?
                                        I'm about to through out this TV, I'm angry, but on the other hand I would like to find out the cause.
                                        I have three power supplies and none of them it's good.
                                        Any help would be greatly appreciated.
                                        Where is the ground for measuring in the primary side?
                                        If I use the big capacitor's negative, I'm getting "kHz" measurements.
                                        Which IC is the smps controller?

                                        Comment


                                          #40
                                          Re: Vizio VX37LHDTV10A

                                          Boy, I do not really know what is going on with your setup and the TV. I just setup the power supply for VX37 and took some pictures for you.
                                          What happen if you put the power supply back in but do not connect the power cables to the Inverter boards, will the VIZIO LOGO stay white?
                                          Attached Files
                                          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

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