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Testing Ballast Or Choke In Fluoroscent Lamp

By on April 8, 2008

Have you encounter before whenever you replace a new fluoroscent lamp and “On” it, the new lamp will immediately go bad again. You will be wasting your money and do not know why the new lamp die instantly. It was due to a bad or shorted winding in the ballast or choke located inside the fluoroscent lamp casing. Take the ballast out and place your flyback tester to the input of the ballast. A good ballast should have about three LED bars (for a 240V ballast) and the bad one will usually have only one LED bar and sometimes the LED may goes off too indicating a severe short circuit betwen windings.

fluorescent lamp

If you use a normal analog/digital meter to test the winding, you will not be able to see the difference and you may have thought it was good. In the future, if your house fluoroscent lamp have problem, don’t directly replace the lamp, switch off the lamp and test the ballast with your flyback tester. If the winding is good you then can proceed to fix the new lamp.

The repair business is getting good nowadays. Yesterday there were 18 equipment came in for repair. 12 CRT Monitors, 3 LCD Monitors and 3 Printers. Well, got to start working and if i discovered any new solution i will post it into this blog.



  1. Jenny

    May 15, 2008 at 6:17 pm

    Dear Sirs,

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    Jiangmen City ,Guangdong Province,P.R.China
    Tel:86-750-3377438 3377423
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  2. Steven

    January 19, 2009 at 1:19 pm

    Analog switch ICs are the easiest electronic components that can be searched online. You don’t believe us? Just try it. The fastest growing network consisting of the leading Analog switch IC manufacturers, suppliers and distributors.

  3. admin

    January 19, 2009 at 10:09 pm

    Hi Steven,
    Thanks for sharing the good website!



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