identity tv part

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  • nosugartonight
    Senior Member
    • Jan 2018
    • 107
    • united states

    #1

    identity tv part

    ON a power board. This part looks like a resistor but has no color bands. It is marked jw2 4.7 with ohms sign. They are 3 in a row. Checking in diode mode they read closed. What are they and what should they read.
  • nosugartonight
    Senior Member
    • Jan 2018
    • 107
    • united states

    #2
    Re: identity tv part

    Here is a pic
    Attached Files

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: identity tv part

      They are 4.70 Ohms 2W connected in parallel, they are fine.
      You will get more help wit make and model and problem and good clear pictures of the whole top and bottom side of this power supply board.
      Last edited by budm; 01-28-2018, 05:04 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

      • nosugartonight
        Senior Member
        • Jan 2018
        • 107
        • united states

        #4
        Re: identity tv part

        Thanks. This is a vizio VO47LFHDTV30A Has no voltages on plug/cable going to main board. Checking voltages on hot side,using negative side of large cap for ground. Everything seems ok. It's when I get to the small transformer is when there is no voltages. I will try to add pics.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: identity tv part

          We need good clear pictures so we can see what we are dealing with, must provide straight shot pictures of the top and bottom side of the board, the pictures must be clear enough to be able to trace out the cooper trace on the bottom side of the board.
          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

          • nosugartonight
            Senior Member
            • Jan 2018
            • 107
            • united states

            #6
            Re: identity tv part

            Gotta. I'm trying to add pictures but after upload.stays on that screen and I click"close this window" goes back to message and everything I wrote is gone. Trying to figure it out ��

            Comment

            • nosugartonight
              Senior Member
              • Jan 2018
              • 107
              • united states

              #7
              Re: identity tv part

              Think I have to upload one at a time
              Attached Files

              Comment

              • nosugartonight
                Senior Member
                • Jan 2018
                • 107
                • united states

                #8
                Re: identity tv part

                Top left
                Attached Files

                Comment

                • nosugartonight
                  Senior Member
                  • Jan 2018
                  • 107
                  • united states

                  #9
                  Re: identity tv part

                  Bottom left
                  Attached Files

                  Comment

                  • nosugartonight
                    Senior Member
                    • Jan 2018
                    • 107
                    • united states

                    #10
                    Re: identity tv part

                    Top right
                    Attached Files

                    Comment

                    • nosugartonight
                      Senior Member
                      • Jan 2018
                      • 107
                      • united states

                      #11
                      Re: identity tv part

                      Bottom right. Hope they are ok
                      Attached Files

                      Comment

                      • nosugartonight
                        Senior Member
                        • Jan 2018
                        • 107
                        • united states

                        #12
                        Re: identity tv part

                        Board number 0500-0407-0680
                        Attached Files

                        Comment

                        • nosugartonight
                          Senior Member
                          • Jan 2018
                          • 107
                          • united states

                          #13
                          Re: identity tv part

                          Ok . Can you please tell me if the pictures are good enough

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: identity tv part

                            https://www.badcaps.net/forum/attach...5&d=1517185124
                            So you are 100% sure that you do not have any DC Voltage on the 5VSB pins at all?
                            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

                            • R_J
                              Badcaps Legend
                              • Jun 2012
                              • 9517
                              • Canada

                              #15
                              Re: identity tv part

                              Check if R901 or R902 is open, and if Q901 is shorted

                              Comment

                              • nosugartonight
                                Senior Member
                                • Jan 2018
                                • 107
                                • united states

                                #16
                                Re: identity tv part

                                Ok here what I have discovered. Before I removed the power board to take pics. There was no voltages on any pins . Everything on hot side shows voltages. I believe there all right. No voltages on cold side. But when I went to put the board back. I only used a couple of screw's. I rechecked the pins. To my surprise there are voltages on the pins. When I put the bottom right screw in. Lost all voltages on pins. Tracing from the 5v pins . Everything shows grounded. All the way up to pc702 which looks like a IC but only has 4 legs. . I will post a pic. I hope you understand what I'm saying

                                Comment

                                • nosugartonight
                                  Senior Member
                                  • Jan 2018
                                  • 107
                                  • united states

                                  #17
                                  Re: identity tv part

                                  The leg in pointing to is grounded

                                  Comment

                                  • nosugartonight
                                    Senior Member
                                    • Jan 2018
                                    • 107
                                    • united states

                                    #18
                                    Re: identity tv part

                                    Should it be grounded. This leg is the only one from all 3 ic's
                                    Attached Files

                                    Comment

                                    • R_J
                                      Badcaps Legend
                                      • Jun 2012
                                      • 9517
                                      • Canada

                                      #19
                                      Re: identity tv part

                                      It might be, how about turning the board over and trace the line to see if it goes to ground, it's hard to tell looking at pictures only.
                                      "Tracing from the 5v pins . Everything shows grounded"Are you saying that you have a short on CN201 between SGND and 5VSB?
                                      Last edited by R_J; 01-29-2018, 07:55 PM.

                                      Comment

                                      • nosugartonight
                                        Senior Member
                                        • Jan 2018
                                        • 107
                                        • united states

                                        #20
                                        Re: identity tv part

                                        I can do that,ASP. Thanks for your info

                                        Comment

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