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flikery picture with hissing sound when bright only

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    flikery picture with hissing sound when bright only

    Hello guys

    I just replaced my faulty FBT with a brand new chinese one for my LG 29" RT-29FB75VE CRT TV

    the replacement was not the exact model but it has same pin assignment and voltages

    The tv worked perfectly with same exact super quality/contrast image
    but I noticed that the image does flicker noticeably WITH a hissing sound from the FBT only when there is a very bright image is displayed or a sudden brightness like explosions in a movie or something

    if I drop down the contrast/brightness from the menu (still nice picture) that issue never happens

    the FBT replacement is a BSC26 - N2137 (6174V 5003Z)
    my original FBT is 6174V 5003R

    what does that issue mean?
    Thanks

    #2
    Re: flikery picture with hissing sound when bright only

    Originally posted by GraphicMan View Post

    chinese
    ...

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      #3
      Re: flikery picture with hissing sound when bright only

      Crap replacement flyback, try and find an original. This problem has been around for years. In a lot of cases the cheap replacements just do not work correctly. Higher brightness means more current has to be supplied by the flyback.
      Last edited by R_J; 10-01-2018, 05:46 PM.

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        #4
        Re: flikery picture with hissing sound when bright only

        what killed the old one ?

        Comment


          #5
          Re: flikery picture with hissing sound when bright only

          Thank you very much for your replies

          What killed the original: I dont know, but it arced after about 14 years of use, so it has to be replaced

          Comment


            #6
            Re: flikery picture with hissing sound when bright only

            Those replacements are not made to the same spec. as original, but it could be that you got a poorly made one. If you can have it replaced with another one or have it replaced with another brand it might work better.
            I have had replacements for Hitachi that did not work (narrow picture, poor hv regulation) I ordered an original and it worked perfect. I have also used those $10.00 transformers in some Sony's and they worked ok.

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              #7
              Re: flikery picture with hissing sound when bright only

              Turn the SCREEN control on the FBT to the bare minimum to see a picture

              Comment


                #8
                Re: flikery picture with hissing sound when bright only

                Like I said, I lowered the brightness/contrast just a little (still have a great bright picture) and this issue does not show anymore

                I am very happy with the picture at the moment, I have also glued a 12cm fan in front of the FBT/Heatsink around it in an attempt to keep it for a longer time

                that fan is inside the cabinet and controlled via a switch outside, powered with a dc adapter, it helped lower the overall heat in that area

                I just want to know, would that FBT live for some years or that issue is a sign of a soon failure?

                it has been about 5 days now of work

                Comment


                  #9
                  Re: flikery picture with hissing sound when bright only

                  it could also be a failing B+ capacitor that smooths the power to the transformer.

                  Comment


                    #10
                    Re: flikery picture with hissing sound when bright only

                    Originally posted by stj View Post
                    it could also be a failing B+ capacitor that smooths the power to the transformer.
                    Mabe not in that case because that never happened before with the original FBT

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