Common Fault In Dell E151FPb 15″ LCD Monitor
I have repaired many Dell E151FPb 15″ LCD Monitor. The complaint was no power (LED no light) and when you test the secondary output voltage with your analog meter, you could see that the voltages are actually pulsating! This is a common problem and i have repaired many of them. The cause of the problem is not a bad filter capacitor, faulty power IC, defective resistor or even diode. It was actually due to 2n7000 FET that was breaking down when under full load! That means the FET tested okay with your meter but fail when under full operating voltage.
I still could recall the first time i troubleshoot this problem. It took me many hours to solve it and now this problem can be solved in a matter of seconds! It is good to write down in a book all the problems and solutions in electronic repair so that you will not waste your precious time recalling the solutions.