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Laptop, LCD TV and Monitor Backlight Tester

By on October 1, 2011

ccfl backlight tester

Found this tester in ebay and the tester can be used to test a backlight up to 1000mm. The price is quite reasonable. For more information you can visit the website and check from the seller. Please click on the photo to visit the ebay website.



  1. IMOH

    October 13, 2011 at 4:29 am

    My LCD back light is not on,the screen display fainting images, so i guess the back light is bad. Pls how can i fix this, (2) what voltage powers the LCD back light. thanks

  2. admin

    October 13, 2011 at 12:13 pm

    HI Imoh,

    Make sure there is supply voltage to inverter ic. No voltage the display will become faint. The ac voltage to the backlight is about 450vac to 1000vac depending on the model.


  3. IMOH

    October 14, 2011 at 9:27 am

    Thank sir for ur reply. Have tested it,12volt dc is supplied to d inverter circuit,fuse is ok stil screen is dark. You can only know dat the screen is displaying if u point a flash light touch on it. Pls sir what could b d problem n solution. Tanks

  4. admin

    October 15, 2011 at 2:32 am

    HI Imoh,

    If there is supply voltage to the inverter ic. Then you need to check if there is any output waveform or not. If do not have you need to replace the inverter ic.


  5. e-rool

    October 20, 2011 at 1:45 am

    boleh tak bgtau camne nk idupkan LED yg guna 3 bateri AA 1.5V m'gunakan bateri 12V? tlg bgtau caranya dgn details sbb klau kita sambung terus LED akan terbakar sbb arus yg tggi...terima kasih..

  6. admin

    October 21, 2011 at 2:17 am


    Sambungkan 330ohm resistor secara siri dgn bekalan kuasa.


  7. dave

    May 22, 2012 at 1:26 am

    sir jestine hi
    I have a problem in my computer power supply  no switch, I check the puse, bridge diode it is working fine  
    and when i connect to the power
    then i switch still not switching  what is the sir? can I ask you help? thank you 

    • Jestine Yong

      May 27, 2012 at 4:09 am

      Hi Dave,

      Have you check all the components i9n the primary side? What about secondary diodes and filter cap?


  8. Matt

    June 1, 2012 at 3:55 am

    Do you know of anywhere in Singapore that sells 2mm diameter x 85mm backlight lamp for LCD montior. Have been trying to find a supplier but no one has that small a size. Monitor is 4inch by 4inch.
    Any help be appreciated

    • Jestine Yong

      June 1, 2012 at 8:05 am

      Hi Matt,

      Sorry no info on this. Try


  9. Toni

    June 4, 2012 at 9:38 am

    Hi Jestine.

    I’m looking for a ccfl tester and I see the same tester that you say above.
    I have one question to solve before I order. How this tester can regulate the voltage/current at different lengths of lamps.  


    • Jestine Yong

      June 5, 2012 at 6:01 am

      HI Tony,

      For more information I suggest that you check with the seller. They should have the info of the tester spec.


  10. Andrew

    February 18, 2019 at 6:19 pm

    My Sony Bravia Led Tv -KDL60EX700 blinks 5 times. No picture & audio. Did try to restart.. goes green then after a few seconds back to standby red blinking 5 times.. Whay may be the problrm sir? tq

    • Jestine Yong

      February 20, 2019 at 2:29 pm

      Hi Andrew,
      Possible the memory IC could have corrupted if all the dc supply voltage to the ICs are good.


  11. DOĞAN

    September 4, 2019 at 8:00 pm

    Merhaba. Türkiyeden selamlar olsun. Siteniz ve siz harikasınız.
    ccfl lambalara giden ac voltajın frekansı 50 hz mi? teşekkürler.
    Hello there. Whether Greetings from Turkey. Your site and you are great.
    Is the frequency of ac voltage to ccfl lamps 50 Hz? thanks.

    • Jestine Yong

      September 5, 2019 at 8:01 am

      Hi Dogan,

      It is usually more than 50Khz.



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