Another vw42l problem

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  • abarker8323
    Member
    • Oct 2012
    • 32
    • usa

    #1

    Another vw42l problem

    Hi guys i have a vizio vw42l. I initially had a bad voltage regular on the main board. I had messed the tracing up on while removing the regulator. After attempts of trying to fix my mess up i made it worse and removed more tracing. I put the project on hold for a couple months and finally just bought a new main board. After installing new board the tv came on and everything worked great! I buttoned everything up the next day and went to turn it on, now i have nothing! Tore back apart and now i am no longer getting 24v or 12v from the power supply. The led turns orange to white and will will turn back off also. I have 5vdc coming from the supply to the main and i am getting 3.3vdc back to the ps_on. The 12v side of the main has no readings what so ever either. Please help, i am getting very frustrated. Thanks.
    Attached Files
  • martyparish
    Badcaps Veteran
    • Dec 2012
    • 313
    • United States

    #2
    Re: Another vw42l problem

    It could be bad caps on the power board. Have you inspected them closely? Especially the ones under the heat sink.

    Try warming the caps up with a hair dryer and then try to power it on.

    Comment

    • abarker8323
      Member
      • Oct 2012
      • 32
      • usa

      #3
      Re: Another vw42l problem

      None of them physically look bad. No bulging ends or anything. I had checked them all the prior time before i realized it was a voltage regulator. They all charged to their respective values. Where does the 24 volt and 12 volt side originate from? Is their anything that triggers them from the main board other than the ps_on?

      Comment

      • abarker8323
        Member
        • Oct 2012
        • 32
        • usa

        #4
        Re: Another vw42l problem

        And heat gun or freeze spray does nothing

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Another vw42l problem

          Lets find out first to see if the PFC voltage booster circuit is working or not. Check the DC voltage on the two legs of the large cap (450v) in the primary side of the power supply, it should have 160~170vdc when the TV is not turn on, then it should go up to about 380~390v when the TV is turn on. PS_ON turn on the PFC and the 12/24V section.
          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

          • abarker8323
            Member
            • Oct 2012
            • 32
            • usa

            #6
            Re: Another vw42l problem

            it indeed has 161 when off and 400.1 when turned on

            Comment

            • abarker8323
              Member
              • Oct 2012
              • 32
              • usa

              #7
              Re: Another vw42l problem

              What does PFC stand for?

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Another vw42l problem

                Power Factor Correction.
                So the next section we need to work on will be the 12v/24v switching power supply section, it will need in-depth troubleshooting down to component level. What kind of tools do you have? Have you done any surface mounted component repair?
                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

                • abarker8323
                  Member
                  • Oct 2012
                  • 32
                  • usa

                  #9
                  Re: Another vw42l problem

                  I have done a little. I have fixed 6 TVs so far from the forums. Caps, voltage regulators, power transistor. I have usually been able to find a post simular to the issue at had and diag from there. Not this time. I have a klien digital mm. Can read capacitance. Assortment of solder irons, solder sucker, solder wick, and plenty of room!

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: Another vw42l problem

                    OK, then for me to help you troubleshoot this power supply board, I will need really good clear pictures of the board. Please take the whole picture of the top side and the bottom side of the board, then take close up 1/4 section of board (top and bottom) so I can easily see the traces and the component designators.
                    I will then try to trace out the circuits and then provide you the test points and components you will need to check.
                    Just remember that I do not have the board in front of me to look at, so GOOD CLEAR FOCUS pictures are really important.
                    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

                    • abarker8323
                      Member
                      • Oct 2012
                      • 32
                      • usa

                      #11
                      Re: Another vw42l problem

                      Sounds good, give me a few and i will get the wife digital camera and get them posted.

                      Comment

                      • abarker8323
                        Member
                        • Oct 2012
                        • 32
                        • usa

                        #12
                        Re: Another vw42l problem

                        Hope these work. I have taken pictures for a hour and half. Harder than it looks. Let me know if you need a better one of something. I included a couple extra so you could see under heat sinks.
                        Attached Files

                        Comment

                        • abarker8323
                          Member
                          • Oct 2012
                          • 32
                          • usa

                          #13
                          Re: Another vw42l problem

                          .
                          Attached Files

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: Another vw42l problem

                            I do not see the picture of the whole view of the bottom side of the board, the other bottom side pictures are out of focus. May be you need good day light for the light source for better pictures.
                            What I have to do is to print out all the pictures and then tape them together to make one big board and trace out the connections. So you understand what I need for me to be able to see.
                            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

                              #15
                              Re: Another vw42l problem

                              Ok, I see the whole bottom side, but it is not in focus.
                              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

                              • abarker8323
                                Member
                                • Oct 2012
                                • 32
                                • usa

                                #16
                                Re: Another vw42l problem

                                ok. i guess that i could try that idea in the am. Dark here in wy. I will get them to you first thing in the am. Thanks alot bud for helping me!

                                Comment

                                • abarker8323
                                  Member
                                  • Oct 2012
                                  • 32
                                  • usa

                                  #17
                                  Re: Another vw42l problem

                                  Here is the quarters
                                  Attached Files

                                  Comment

                                  • abarker8323
                                    Member
                                    • Oct 2012
                                    • 32
                                    • usa

                                    #18
                                    Re: Another vw42l problem

                                    There are some parts that are still not clear so here are 1/9ths
                                    Attached Files

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #19
                                      Re: Another vw42l problem

                                      OK, I just download more pictures that you posted, please give me more times to look through them.
                                      By the way, thanks for much better pictures! Same camera that you used last night?
                                      Last edited by budm; 04-21-2013, 10:29 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

                                      • abarker8323
                                        Member
                                        • Oct 2012
                                        • 32
                                        • usa

                                        #20
                                        Re: Another vw42l problem

                                        No, last night was 10mp on smart phone with shaky hands. Today was with 16.2mp digital camera on tripod.

                                        Comment

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