LCD tv power supply transformer magnets broke off

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  • shelby5041
    Badcaps Legend
    • Feb 2009
    • 1504
    • united states of america usa

    #1

    LCD tv power supply transformer magnets broke off

    Hi

    I have a typical lcd tv poeer supply
    I dropped the board snd the magnets on the dc transformer broke off

    Is the board no good now?

    What is purpose of the magnets mounted on both sides of transformer
  • R_J
    Badcaps Legend
    • Jun 2012
    • 9532
    • Canada

    #2
    Re: LCD tv power supply transformer magnets broke off

    There are no "magnets" on a transformer, I think you are referring to the transformers ferrite core. Why not post a picture?

    Comment

    • shelby5041
      Badcaps Legend
      • Feb 2009
      • 1504
      • united states of america usa

      #3
      Re: LCD tv power supply transformer magnets broke off

      Thanks

      Cant tske a pic

      Here is stock photo
      Pieces in yellow broke off

      Will ps not operate now?
      Attached Files

      Comment

      • R_J
        Badcaps Legend
        • Jun 2012
        • 9532
        • Canada

        #4
        Re: LCD tv power supply transformer magnets broke off

        The power supply will likely still operate, but the transformer will not operate efficiently as the core is broken and its drive circuit will likely fail when the supply is under load.

        Comment

        • shelby5041
          Badcaps Legend
          • Feb 2009
          • 1504
          • united states of america usa

          #5
          Re: LCD tv power supply transformer magnets broke off

          Thanks
          Is there anything i can do with the broken pieces to fix it or no

          I guess ill put it back in tv and see what happens.

          Comment

          • R_J
            Badcaps Legend
            • Jun 2012
            • 9532
            • Canada

            #6
            Re: LCD tv power supply transformer magnets broke off

            You can try fitting the pieces back but they would not be magnetically conductive like when they were originally. If used like that I suspect the transformer could run hot as well. It would be best to replace it if you can find one from another board, maybe one that the board is beyond economical repair but the transformer is good.

            Comment

            • shelby5041
              Badcaps Legend
              • Feb 2009
              • 1504
              • united states of america usa

              #7
              Re: LCD tv power supply transformer magnets broke off

              thank you
              this is not worth repairing as it is just a tv i found in trash

              i dont put money into tvs anynmore..not worth it

              lcd tvs are worthless nowadays

              ill just glue it together and see if tv powers on..if it does ill just leave it as is

              if it no power on ill just toss tv in trash

              Comment

              • shelby5041
                Badcaps Legend
                • Feb 2009
                • 1504
                • united states of america usa

                #8
                Re: LCD tv power supply transformer magnets broke off

                hi JR

                i glued the ferrite back in place as best i czn with super glue

                i did test the ps outside of tv i do get 5v standby so i assume tv ps will porb work but as you said for how long

                i really dont care for how long since the tv is just a project tv..i dont use it

                so tomorrow i will install it in the tv and see what happens

                Comment

                • momaka
                  master hoarder
                  • May 2008
                  • 12168
                  • Bulgaria

                  #9
                  Re: LCD tv power supply transformer magnets broke off

                  Keep us posted what happens.
                  The glued core should work, so long as you didn't increase the gaps too much.
                  If it works, also put some silicone glue to hold the core together. Superglue does not deal that well with heat-cycling and may eventually crack. So to prevent the core from cracking, silicone glue is recommended to hold everything as a "backup".

                  Comment

                  • shelby5041
                    Badcaps Legend
                    • Feb 2009
                    • 1504
                    • united states of america usa

                    #10
                    Re: LCD tv power supply transformer magnets broke off

                    Hi...i did superglue it and tv powered on fine as i expected

                    The unknown is how will it affect long term use...i dont usecthectv so ill never know

                    When you say silicone what area are you referring to?

                    Can i just incase the entire ferrite perimeter in silicone? And is it just 100% pure siliccone caulking or a silicone based heat resistant glue?

                    Comment

                    • momaka
                      master hoarder
                      • May 2008
                      • 12168
                      • Bulgaria

                      #11
                      Re: LCD tv power supply transformer magnets broke off

                      Awesome, good to hear you got it working!

                      Originally posted by shelby5041
                      When you say silicone what area are you referring to?

                      Can i just incase the entire ferrite perimeter in silicone? And is it just 100% pure siliccone caulking or a silicone based heat resistant glue?
                      Well, RTV / heat-resistant silicone would be better, but it's not necessary.
                      I've used regular cheap silicone caulking (they type used in bathrooms) with pretty good results so far. Only thing to watch out for is to make sure to get one that is low VOC / low odor. As silicone cures, it may release acetic acid, which can sometimes corrode electrical contacts and metals. The low VOC / low odor stuff, IIRC, releases a little less of that so it's overall safer for electronics.
                      I don't suggest encasing the entire transformer / ferrite with silicone, as that may reduce its cooling ability. But adding a good layer over the areas where the cracks were should work fine.
                      Last edited by momaka; 01-29-2022, 05:09 PM.

                      Comment

                      • diif
                        Badcaps Legend
                        • Feb 2014
                        • 6978
                        • England

                        #12
                        Re: LCD tv power supply transformer magnets broke off

                        Look for it indicating neutral cure for a non acetic acid version.

                        Comment

                        • shelby5041
                          Badcaps Legend
                          • Feb 2009
                          • 1504
                          • united states of america usa

                          #13
                          Re: LCD tv power supply transformer magnets broke off

                          Thanks for the good info but
                          Its just a cheap lcd tv
                          Ill just use 100% silicone caulking i have on hand..

                          If it was something expensive or something i was going to keep long term i would use more appropriate silicone but its just a typical modern day crappy made lcd tv so

                          Thank you

                          Comment

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