Vizio XVT3D650SV - Help

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #21
    Re: Vizio XVT3D650SV - Help

    Here is the function blocks of the power supply board:
    T901 transformer is for:
    Rectifier D909 is for 18V (CN203 PIN 3 & 4, filter cap C934), transformer pin 10, 11.
    Rectifier D907A, 907B are for 5VSB (CN202 PIN 1~4, CN201 PIN 8~9, filter cap C952), transformer pin 6, 7.
    Transformer pin 8, 9 are common ground.

    T601 transformer is for:
    Rectifier D201 is for 12V (CN202 PIN 10~12, CN201 PIN 6~7, filter cap C203), transformer pin 2, 5.
    Rectifiers D120A, 120B are for 24V C121 is one of the filter caps, transformer pin 6, 7.
    Transformer pin 9, 10 are common ground.
    Attached Files
    Last edited by budm; 07-03-2014, 05:01 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

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #22
      Re: Vizio XVT3D650SV - Help

      CN203 pin 3 & 4.Unless the label is wrong, that does not look right, it should be 18V. You do have 5VSB (CN202 PIN 5~8) OK, right?
      This 18V is switched through Q912.
      Last edited by budm; 07-03-2014, 05:09 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

      • newpey
        Member
        • Sep 2013
        • 38
        • usa

        #23
        Re: Vizio XVT3D650SV - Help

        Across the caps

        DCV
        left: 76.9 right: -55.5
        ACV
        left: ~63.2 right: ~63.0

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: Vizio XVT3D650SV - Help

          Originally posted by newpey
          Across the caps

          DCV
          left: 76.9 right: -55.5
          ACV
          left: ~63.2 right: ~63.0
          Are you checking the voltage right at the TWO LEGS (+ and -) of the caps as I requested? You cannot use the chassis for the black probe since you are working in the primary side of the circuit. The measurement are in DC, not AC.
          Last edited by budm; 07-03-2014, 05:12 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

          • newpey
            Member
            • Sep 2013
            • 38
            • usa

            #25
            Re: Vizio XVT3D650SV - Help

            So the CN203 only has 4 pins:
            1&2 SGND i assume that is ground but I cant use that for a ground point to test voltage of 3&4, I have to use the metal of the tv or the ground from another wire. Is that right? Are we looking at the same connector?

            Comment

            • newpey
              Member
              • Sep 2013
              • 38
              • usa

              #26
              Re: Vizio XVT3D650SV - Help

              Originally posted by budm
              Are you checking the voltage right at the TWO LEGS (+ and -) of the caps as I requested? You cannot use the chassis for the black probe since you are working in the primary side of the circuit. The measurement are in DC, not AC.
              Whooops! That;'s what happens when a software engineer uses a multimeter

              163.5 volts across the legs of all 3

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #27
                Re: Vizio XVT3D650SV - Help

                "1&2 SGND i assume that is ground but I cant use that for a ground point to test voltage of 3&4" YES, you can use that for the secondary circuit ground ref (OR chassis ground) to test the 5V, 12V, 18V, and the 24V.
                Right now I need are the voltage on those 3 main filter caps in the primary side to know if the PFC circuit is functioning or not, DO NOT LET THE PROBES SLIP ON YOU while checking. PFC must be working before going any further.
                Last edited by budm; 07-03-2014, 05:21 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

                • newpey
                  Member
                  • Sep 2013
                  • 38
                  • usa

                  #28
                  Re: Vizio XVT3D650SV - Help

                  Originally posted by budm
                  "1&2 SGND i assume that is ground but I cant use that for a ground point to test voltage of 3&4" YES, you can use that for the secondary circuit ground ref (OR chassis ground) to test the 5V, 12V, 18V, and the 24V.
                  Right now I need are the voltage on those 3 main filter caps in the primary side to know if the PFC circuit is functioning or not, DO NOT LET THE PROBES SLIP ON YOU while checking. PFC must be working before going any further.
                  Right on! No zaps tonight! 163 volts on the legs of all 3

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #29
                    Re: Vizio XVT3D650SV - Help

                    OK, that is more likely that the main board is not sending the PS_ON to turn on the PFC, or that the PFC is not working. I am still not sure if you are making the correct reading on the correct pin of the REMOTE_ON/OFF pin.
                    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

                    • newpey
                      Member
                      • Sep 2013
                      • 38
                      • usa

                      #30
                      Re: Vizio XVT3D650SV - Help

                      OK, so on CN202.. I am testing like this...

                      Black probe on pin 1 (front right corner - black wire)
                      pin 2 would be far right back corner.
                      pin 3 would be front, second to last pin from right
                      pin 4 behind pin 3

                      in the picture....
                      pin 1: black wire
                      pin 3: red wire
                      pin 5: yellow wire
                      pin 7: blue wire
                      pin 9: grey wire

                      pin 13 remote on/off would be the 2nd wire in from the left (smaller yellow), up front visible in picture

                      Am I right or way off?
                      Attached Files

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #31
                        Re: Vizio XVT3D650SV - Help

                        See the pin 13, as you can see you have ODD and EVEN numbering on the dual-row connector.
                        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

                        • newpey
                          Member
                          • Sep 2013
                          • 38
                          • usa

                          #32
                          Re: Vizio XVT3D650SV - Help

                          Originally posted by budm
                          See the pin 13, as you can see you have ODD and EVEN numbering on the dual-row connector.
                          Awesome .. I get -5.17 with or without pushing power button

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #33
                            Re: Vizio XVT3D650SV - Help

                            OK, so the PS_ON (ON/OFF) control line is stuck on and you do not have PFC voltage function to run the 12V and 24V power supply and turn on the switched 18V power supply. Not good.
                            Did the problem just happen by itself or the TV was hit by any power surge, etc, or worked on by some one else before?
                            Last edited by budm; 07-03-2014, 07:03 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

                            • newpey
                              Member
                              • Sep 2013
                              • 38
                              • usa

                              #34
                              Re: Vizio XVT3D650SV - Help

                              That worries me....

                              So the history of it...

                              It started to not turn on unless unplugged for hours (overnight) while trouble shooting it, I drained the 3 caps you had me test by shorting them (learned later there are better ways to drain them). This kept the TV turning on while I waited for new caps to come in for the power board as I thought one was swollen. At some point the TV never turned on again. I replaced those caps but still no luck. I figured I fried something somewhere. I ordered a brand new power board and installed it but same issue.

                              So now I am stuck with it busted and no clue what the issue is other than what you just said (which is more info than i had!)

                              Soooooo i prob caused it and at least i admitted it but still sucks!

                              Comment

                              • bammbammfran
                                Badcaps Veteran
                                • Apr 2014
                                • 476
                                • USA

                                #35
                                Re: Vizio XVT3D650SV - Help

                                Originally posted by newpey
                                OK I did some testing on the main board:

                                Voltage Regulator on bottom right (7806cg rka07):
                                Pins:
                                Top 5.17
                                Middle 5.18
                                Bottom 5.17
                                Out 5.18

                                Voltage Regulator on bottom left: (m462 g1117)
                                Pins:
                                Top 5.17
                                Middle 5.16
                                Bottom 5.17
                                Out 5.16
                                8
                                These do not look correct considering that the one tab should be a ground.
                                For instance: on the 7806 ? which I think is a 7805-- it should be the center small pin and the large tab

                                Are you sure you are using your tester correctly and using a proper ground ?

                                I have a feeling that the 12 volt supply where I pointed out that F1 fuse that looked questionable should be probably on at the same time as the 5 volts.
                                Can you post a bottom picture of the power supply board

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #36
                                  Re: Vizio XVT3D650SV - Help

                                  The 12V and the 24V are generated by the same power transformer T601 and is turned on by the ps_on, the 5vsb and the switched 18V (also turn on by PS_ON) is generated by T901. The 12v/24v SMPS runs on boosted PFC voltage. Also see post 21.
                                  His V readings do look right at all, not sure what he used for GND. REF.
                                  Attached Files
                                  Last edited by budm; 07-03-2014, 08:37 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

                                  • bammbammfran
                                    Badcaps Veteran
                                    • Apr 2014
                                    • 476
                                    • USA

                                    #37
                                    Re: Vizio XVT3D650SV - Help

                                    Thanks bud
                                    Helps to have a good one shot picture to work with
                                    I now see the 5-12-18 & 24 source transformers

                                    Still, those two voltage regulator readings have me confused ?

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #38
                                      Re: Vizio XVT3D650SV - Help

                                      I am not worried about that right now, it is the PFC circuits that have me concerned since it is not going up like it should, the PS_ON is also at 5V I expect it to be less than 5V due to the bias resistors and the Vbe junction voltage. I have a feeling the ps_on is not getting all the way to turn on the Transistor or the Opto. It is hard to trace out that REMOTE_ON/OFF line to see where it goes. I will have to zoom in more to see. My be you have better eyes than I do.
                                      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

                                        #39
                                        Re: Vizio XVT3D650SV - Help

                                        OK, this is not going to be easy, you will have to get access to Q301 which is the transistor that receives the PS_ON signal fro pin 13, this signal is fed to R310A (1K) to the BASE of Q301. We need to find out what DC voltage we have at E and B, we know that one end of R310A that is connected to pin 13 of CN202 has 5VDC on it, so I expect to see about 0.6~0.8Vdc between E and B. Th hard will be that you will to work with the board powered up which can be dangerous.
                                        Q301 when it is turned on by ps_on, it will then turn on Q302 which will turn on OPTO, then the Photo transistor inside the Opto is turn on which it then turn on the transistor to supply the B+ to run the PFC controller IC and the SMPS IC for the 12V/24V section.
                                        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

                                        • newpey
                                          Member
                                          • Sep 2013
                                          • 38
                                          • usa

                                          #40
                                          Re: Vizio XVT3D650SV - Help

                                          OK you guys officially have my head spinning. I need to go take some electrical engineering classes to fully understand what is being said above lol!!

                                          Let me test the pins you want. I will also re-test the voltage regulators. I will make sure I use the ground wire/pin

                                          Comment

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