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.