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Flyback Transformer Primary Winding

By on April 14, 2008

For those of you who has the flyback transformer tester, it is a great advantage that you can test the primary winding  of the flyback. Do you know that sometimes it may not be 100% accurate because some flyback transformer can breakdown when under full load. If you use the dick smith flyback tester toi test on a flyback, a good winding would show about 8 LED bars for a 14 and 15″ CRT Monitor. From the result you might have thought that the primary winding is good but in reality there is a chances it can go bad when the Monitor power switch is “On”.

flyback transformer

In order to know if the flyback transformer primary winding is good or bad you have to make sure that all of the surrounding components test okay and the B+ voltage is correct. That means if all of the above tested okay (including the primary winding) and the CRT Monitor still shutdown or power blink when power “On” possibility is high the primary winding breakdown when under full operating voltage.

The best solution is to use a working flyback transformer from another set and i’ve mentioned before “The best test equipment to test a flyback transformer is the equipment itself”. The equipment itself will test all of the output voltages the flyback generated and etc!



  1. nyomanganesha

    September 19, 2008 at 12:45 pm

    help me ..please . i want to know wingding diagram from modern flyback transformer. how many turn and how much power to drive it.
    thanks for your attention

    best regards

  2. admin

    September 19, 2008 at 10:47 pm

    Hi Nyoman,
    Usually all these information is well kept in the factory and different flyback need different power to drive it.


  3. Altaf

    May 7, 2009 at 12:53 pm

    Respected sir
    i have confusion that there are 10 pins in flyback transormer. what are the names and fucnctions of these pins from 1 to 10. please guide me and tell me about these pins. and specialy tell me about primery winding

    your student
    Altaf Hussain

  4. admin

    May 7, 2009 at 11:49 pm

    Hi Altaf,

    Please visit this link:


  5. Altaf

    May 14, 2009 at 12:52 pm

    Respected and great jestin u r king of electronics. I have never seen an expert of electronics like u. (i think its ur electronic magic)
    My problem is as under
    *where is looketed horizental osciltor ic in crt monitors and how can i cheak it.
    *how can i find G1 pin in bottom of flyback(in pcb).
    i am waiting for ur magical reply

    Your student
    Altaf Hussain

  6. admin

    May 14, 2009 at 9:06 pm

    HI Altaf,

    Horizontal oscillator IC normally located in the center or the bottom of the board and some typical part number are TDA4855, TDA4858, TDA9105 and etc. To check this IC you need a scope to measure the output driver waveform. But of course you have to make sure it has supply first.

    As for the G1, look at the flyback pin where it goes to a diode (cathode side) then at the anode side there is a e-cap where the positive pin is connected to cold ground.


  7. willy white

    October 8, 2009 at 7:11 am

    Hi, do you know a web site where I can get schematics of flyback transformers so I can order the one we need for our project?

  8. admin

    October 8, 2009 at 1:32 pm

    Hi Willy,



  9. izdar

    October 25, 2009 at 12:12 am

    dear sir...
    why we need high voltage in tv?

  10. admin

    October 25, 2009 at 8:28 pm

    HI Izdar,

    In order to accelerate the electrons to hit on the phosphor. The phosphor will light once it had been hit by electrons.


  11. wagino

    December 16, 2009 at 10:15 am

    i've made a ps with fly trnsformer,and it works
    what should i do with the other pins?

    sometimes spark occured between them.
    especialy some closest pins with ground pin.
    one of pin closest is also draws purple spray, but never spark

  12. admin

    December 16, 2009 at 9:36 pm

    Hi Wagino,

    Try cover it with non flammable epoxy.


  13. mhon uy

    August 12, 2010 at 12:45 am

    Sir :
    I would like to know the price of 8 pin color tv flyback , could you give me the price of this flyback tnx & regards

  14. admin

    August 12, 2010 at 8:33 am

    HI Mhon,

    Sorry i do not sell flyback. Try


  15. M.S. Jake

    January 7, 2011 at 12:32 pm

    Could i use a flyback transformer for powering any other electrical device with a similar current consumption? Is it safe?

  16. admin

    January 7, 2011 at 8:25 pm

    HI Jake,

    Yes you can but not recommended. What kind of device you want to power it up?


  17. Olaniran

    February 20, 2011 at 9:02 am

    please i need your assistance on flyback transformer. my school project needs to be power from high dc power unit which i need to design myself. i need flyback to design this high voltage. i have gotten ferrite core from old tv. i need to wind this transformer myself but i don't have information about number of turns for both primary and secondary. my input voltage is 12v and secondary is 5000v switching frequency is 50khz. i will supply you more information if you wish.

  18. admin

    February 22, 2011 at 2:01 am

    HI Olaniran,

    Sorry i do not have those info because I'm just a repairer and not a designer. I suggest that you search from the net for the word "Tesla coil" and try to search if there is any forum on that and they are very good in making their own high voltage gadget.



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