Tuesday, 20 January 2015

Diagnosing LCD backlight inverter problem


I am having problems diagnosing the error with a notebook LCD display inverter.


Symptoms: After switching the notebook on, the LCD backlight comes on but the intensity oscillates rapidly (flickers). After about 1 second the backlight turns off completely. Once the backlight has turned off, the AC output of the inverter measured with a DVM is 0 Vac.



I visually checked the inverter board and there are no obvious faults.


Given the symptoms, can anybody venture a guess at the problem?



  • On the one hand I am tempted to say that the backlight is ok (after all it ignites) and the problem is more likely to lie with the inverter.

  • On the other hand I am wondering whether the flickering of the bulb (faulty bulb?) causes a open-circuit protection of the inverter to kick in after 1 second.


So in summary I am not quite sure whether the fault is more likely to lie with the bulb or the inverter.




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