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Testing the Monitor CRT Yoke Coils

By on September 3, 2007

 crt yoke coil

CRT yoke coils consists of two coils (windings) ie; the horizontal and the vertical yoke coils. It is easy to check on the horizontal yoke coil. Simply measure the coil with Dick smith flyback tester and it should rings 4-5 bars and above. If you get 1-2 bars and the LED don’t lit then it is either had developed partial or complete short between windings. Do not check it with normal multimeters as  shorted yoke coil the meters also show good reading! Vertical yoke coil rarely become defective and the dick smith flyback tester can’t test it. Make sure that it has ohms range from between 3 to about 9 ohms . If you get a measurement of 100 + ohms then most likely the vertical coil have problem and need replacement!

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11 Comments

  1. chrishantha wijesekwra

    April 14, 2011 at 4:01 am

    dear sir
    i need to know about technical information about monster and tv circuit.
    can we fixed tv board to the monitor crt and youk coil, please try to hell p me for this matter

    thanks

    c wijesekera from srilanka

    Likes(3)Dislikes(3)
  2. admin

    April 14, 2011 at 2:52 pm

    HI Chris,

    I suggest that you visit these links that have good info about tv/monitor. Yes the tv/monitor board can be repaired but again it depends on the availability of parts.

    http://www.repairfaq.org/sam/monfaq.htm

    and

    http://www.repairfaq.org/samnew/tvfaq.htm

    Jestine

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  3. azeem

    November 15, 2011 at 11:21 am

    hellow sir i will monitor yoke coil in series for using china tv bord but i dn't know how to yoke coil in series.........
    plz help me

    Likes(5)Dislikes(1)
  4. admin

    November 15, 2011 at 12:38 pm

    HI Azeem,

    Could you elaborate by monitor yoke coil in series? What was the complaint of the monitor?

    Jestine

    Likes(2)Dislikes(1)
  5. Amir Mukhtar

    November 17, 2011 at 10:43 am

    Sir,
    here is the one more test procedure for YOKE coil.
    i have checked and find had OK or Not.
    Simply vertical or Horizontal windings connected one by one but first of all remove yoke connector from PCB circuit.
    In short and easy way is to connect vertical winding wire on horizontal and horizontal winding wire connect on vertical side and set power-ON in series board. means windings wire change to each other or replace to each other.
    its easy to know yoke has shorted or not .. But precautions must be followed during connections and touch under power-off conditions only....

    thanks you
    Amir Mukhtar

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  6. yahiya

    January 9, 2012 at 5:16 pm

    please send tv yoke coil checking method

    Likes(2)Dislikes(2)
  7. admin

    January 9, 2012 at 8:10 pm

    HI Yahiya,

    Just use a blue ring tester and check on the horizontal yoke coil. A good one will show 8 bar LEDs. Vertical yoke can't be tested unless you have the sencore LC103 tester.

    Vertical coil rarely have problem. More than 90% problem happen in the horizontal yoke coil.

    Jestine

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  8. Husam

    September 25, 2017 at 5:03 pm

    Hello Sir,
    I have an EBM ( Elecron Beam Machine ) in laboratory and I would like to measure the current that passes through the deflection coil for a researching purposes. The EBM deflectors are likely the same with TVs deflectors. My question is How much the current passes in the deflection coil for TVs? and how can we measure the current ?

    Warm regards
    Husam Masri

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    • Jestine Yong

      September 27, 2017 at 11:11 am

      Hi Husam,

      I have not performed such test before. If you want to measure the current you need to break the circuit and connect the ammeter in between the line.

      Jestine

      Likes(1)Dislikes(1)
  9. DHEERAJ

    June 26, 2020 at 2:47 pm

    I HAVE A FAULTY YOKE COIL IN MY CRT TV . {SHARP 21NE61 CRT} … CAN I USE A CRT MONITORS YOKE COIL OR WHERE CAN I GET A REPLACEMENT?

    Likes(2)Dislikes(0)
    • Jestine Yong

      June 27, 2020 at 6:00 pm

      Hi Dheeraj,

      I have not tried that before thus I can't provide you with an answer. Nowadays is hard to find replacement for CRT TV parts. By the way when you swap a yoke coil, there are lots of alignment that you need to do and sometimes you may not be able to get the right convergence. The best is to find a replacement tube from junk store or old TVs.

      Jestine

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