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LCD Monitor Repairing Question

By on May 21, 2008


Dear Mr. Yong,

Good day! I Just wanna inquire my problem regarding my 19″ Acer AL1931 LCD Monitor. The problem is No display on screen but there is a power it show up the display just a matter of second and then disappear. Can please help me to solve this problem.

Thank you,


Hi J.M

This kind of fault is very common in any LCD Monitors. There are many reasons why the display shutdown after switched “On”. Dry joints in inverter board, bad filter caps at secondary side of power supply, shorted push pull transistor or the p-channel fet in the buck royer circuit, shorted or a burnt high voltage transformer, bulged or capacitance value out in the tuning capacitor, bad backlights, defective inverter IC or even a faulty Mainboard. Make sure the inverter IC is receiving the supply voltage after the display shutdown if not the Mainboard might have problem. If there is voltage then concentrate on the inverter board and check the section as i have just mentioned above. Have a great day!



  1. ghanshyam meena

    February 19, 2010 at 12:28 am

    dear Mr. Jong
    I have 17" benq fp71G lcd monitor it became blank after few second i have changed all capacitor and fu9024 , c5707 transitor .i have to do please help me .

  2. admin

    February 19, 2010 at 11:31 am

    HI Ghanshyam,

    Have you check the backlight? What about test the tuning capacitor with esr meter?


  3. jonathan

    November 24, 2015 at 10:54 pm

    hi sir i have a samsung lcd tv model ua32eh4000w,the problem of the tv is wont turn on no stanby ligh then i go directly to check power supply i found a diode dq951 my question is when i check it on board it read like a short circuit but when i remove it from board and check again it a good diode pls sir can u adviced me what can i do in this case thanl in advanced

    • Jestine Yong

      November 27, 2015 at 9:25 am

      Hi Jonathan,

      You are checking the parallel circuit. To accurately check a diode, you need to lift one leg up.



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