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Rewinding Your Own B+ Coil

By on August 13, 2008

If you have been in the CRT Monitor repair i’m sure you would have come across shorted B+ coil problem. It could come in the radial type or sometimes the b+ coil could look like a small transformer. The best tester to test B+ coil is the dick smith flyback tester or the Blue Ring Tester. Once you have confirmed that the B+ coil winding shorted you can choose to replace with a new B+ coil, salvage from junk board that have similar inductance or even rewind back the coil by yourself.

If you have decided to rewind the coil then you have to remove the winding from the ferrite core and count the lenght and the diameter. Go to the electronic shop and get the same spec. Sometimes you can buy the wire from a¬†rewinding shop too. Loop back the wire and test again for the inductance and test also with coil tester to see if there is any short between windings or not. The inductance value lower 20% compare to the original value can still be use. Once everything tested okay, you then can proceed to fix back to the Monitor. Just before you power “On” the Monitor make sure the corresponding components like the B+ FET, current sense resistor, HOT and even flyback primary winding are good otherwise the Monitor may still wouldn’t work and in some cases it may burn the newly rewinding B+ coil again. Happy rewinding!



  1. wilson

    January 9, 2009 at 3:38 pm

    Sir thanks for ur explaination.Pls some of my up-coming friends in the world of electronics would like to see pictorially or understand what B+coil or circuits are? b'cos I've tried to explain to them in my little understanding and it is still not clear to them as to whether B+ is a name of components or coil.pls i know it is a difficult task for u to undertake such inconvieniences but i just want them to hear from the horse's mouth and enjoy with me these packages\tutorials of yours. thanks

  2. admin

    January 13, 2009 at 10:52 pm

    Hi Wilson,

    Already sent an email to you.


  3. bongbernal

    January 15, 2009 at 11:03 am

    hi jestine
    it says here we can wind-up a FBT., but somehow never been discuss a matter regarding glue bonding remover or how can we expose the internal winding being bonded in glue, any hints for this? or to what chemical compound can such unglue the bonding.

    god bless and regards

  4. admin

    January 15, 2009 at 9:11 pm

    Hi Bong,
    One can always rewind a coil but not the coil in the FBT because it was fully covered by hard epoxy and there is no way to remove the coil.



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