Polaroid TLA-04641C clicking relay

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  • pop70458
    Senior Member
    • Jan 2012
    • 103
    • USA

    #1

    Polaroid TLA-04641C clicking relay

    The Tv's relay keeps clicking and the voltages fluctuate. The clicking relay is at location RE1.

    on/ off 0.8V--5.2v
    +5VSB 0.8V--5.2V
    12V 0.8V--12.2V
    24SP 0.8V--25V
    24V 0.8V--25V

    Main filter cap goes to 462V and drops with relay clicks.

    Thanks for the help.
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Polaroid TLA-04641C clicking relay

    Can we get side view of the power supply board? There should be small stratup-running lytics caps under the heatsink for the standby power supply section.
    Unhook the cable between the main board and the power supply board and then power up the power supply board by itself and check to see if 5Vstby will be steady 5V or not.

    "Main filter cap goes to 462V" What did you use for the GND ref for the meter to measure that filter cap Voltage? Chassis? You need to measure right between the two legs of the cap because you are making measurement in the HOT side 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

    • pop70458
      Senior Member
      • Jan 2012
      • 103
      • USA

      #3
      Re: Polaroid TLA-04641C clicking relay

      The 5vsb is a steady 5.1v with the mainboard cable unhooked. The main cap is at 170.1v with the mainboard cable removed.


      When i got the 462v I measured the main filter cap while the relay was clicking. It would go to 462v then start dropping and go back up when the relay would click. I used the legs of the main filter cap when i got the 462v reading.
      Attached Files
      Last edited by pop70458; 09-29-2017, 02:00 PM.

      Comment

      • dskall
        Badcaps Legend
        • Oct 2016
        • 2905
        • usa

        #4
        Re: Polaroid TLA-04641C clicking relay

        Check all caps under heatsinks for bulging
        I assume no responsibility for any stupid suggestions I might post.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Polaroid TLA-04641C clicking relay

          https://www.badcaps.net/forum/attach...2&d=1506707143
          There should be small caps under the second heatsink from the left.
          If you truely having 462VDC between the two legs of the main filter cap which is rate at 450 VDC then you have problem with the voltage regulation of the PFC booster circuit problem, it should cause the protection circuit to kick in otherwise that main cap will blow up big time.
          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

          • pop70458
            Senior Member
            • Jan 2012
            • 103
            • USA

            #6
            Re: Polaroid TLA-04641C clicking relay

            The relay near where the ac voltage comes in is constantly clicking.

            Comment

            • vinceroger69
              Badcaps Legend
              • Mar 2012
              • 6714
              • uk

              #7
              Re: Polaroid TLA-04641C clicking relay

              have you got another multi meter you can confirm the main capacitor voltage with as 462v is very high like budm says surprised it has not exploded yet

              Comment

              • pop70458
                Senior Member
                • Jan 2012
                • 103
                • USA

                #8
                Re: Polaroid TLA-04641C clicking relay

                I checked it with another meter it will go somewhere between 442v or 435v for less than a second and then the relay will click and the voltage starts to drop until a hard click. The cycle just keeps repeating itself. There is a 47uf 50v cap and a 10uf 50v cap under the heat sink you referred to earlier.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Polaroid TLA-04641C clicking relay

                  The relay is clicking because your standby 5V is not steady for running the main board so the main board is sending out pulsing PS-ON signal instead of steady DCV of 2V or more.
                  Those two small caps are startup/running caps for the standby power supply section, if they are bad they can cause the STBY 5V to be unstable under load, so you can try replacing them first to see what happen.
                  Over output Voltage of PFC circuit is another problem, if the reading is true for sure.
                  Last edited by budm; 09-30-2017, 01:44 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

                  • pop70458
                    Senior Member
                    • Jan 2012
                    • 103
                    • USA

                    #10
                    Re: Polaroid TLA-04641C clicking relay

                    I replaced the startup caps and now it powers on. I will replace all of the caps.

                    I would like to thank everyone for their help.
                    Attached Files
                    Last edited by pop70458; 09-30-2017, 04:32 PM.

                    Comment

                    • dskall
                      Badcaps Legend
                      • Oct 2016
                      • 2905
                      • usa

                      #11
                      Re: Polaroid TLA-04641C clicking relay

                      What is voltage on main cap now?
                      I assume no responsibility for any stupid suggestions I might post.

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Polaroid TLA-04641C clicking relay

                        Originally posted by dskall
                        what is voltage on main cap now?
                        +10

                        BTW, bad design to put cap under the heatsink where things get hot.
                        Last edited by budm; 09-30-2017, 06:11 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

                        • pop70458
                          Senior Member
                          • Jan 2012
                          • 103
                          • USA

                          #13
                          Re: Polaroid TLA-04641C clicking relay

                          The main filter cap is 410.6v with the tv powered on.

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: Polaroid TLA-04641C clicking relay

                            Originally posted by pop70458
                            The main filter cap is 410.6v with the tv powered on.
                            That is on the high side, I expect 400VDC at the most, typical Voltage is 380~400VDC.
                            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

                            • Jimmy60
                              Member
                              • Jul 2014
                              • 17
                              • USA

                              #15
                              Re: Polaroid TLA-04641C clicking relay

                              Glad I found this thread! budm is the BOMB!!! He was dead on with his diagnosis.

                              Thanks Guys!!!

                              Comment

                              • Jimmy60
                                Member
                                • Jul 2014
                                • 17
                                • USA

                                #16
                                Re: Polaroid TLA-04641C clicking relay

                                Man those two caps are not easy to change!!!

                                Comment

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