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The complaint of this LCD monitor DELL E152Fpb was when the power is turned on (LED lit), but no display. LCD Monitor is different from the CRT screen where you could feel the static in front of the picture tube or hear the rustle of high voltage produced by the flyback transformer. If there is a problem in the main circuit, it would not send an ON (enable) signal to the starter circuit voltage smoothly and the IC will not inverter waveform produced by the transformer high voltage. In the case above, when the lid was removed, the first thing I was controlling the supply voltage Vcc () for IC inverter. This model uses the famous TL1451ACN Modulation (PWM) IC-some prefer to call as IC inverter. Pin 9 is input to VCC and should take about 12 volts when the voltage is present. Measure the pin with my trusty digital multimeter, it only reads about 3 volts which indicates problem in the Therese supply line. It might be components that are defective lying on the line or it could be the power itself switch mode supply that could not produce enough energy. To find the answer section that gives the problem, the first clue is that the power LED lights up and this proves that CI provides enough power for the circuit. Another clue is that the counter registers about 16 volts at the input fuse 2A. Because of these clear answers, we can conclude that the switching power supply works well. You can also use a bulb 12 volt light to confirm it. You can read my post on other articles about LCD Monitor repair that with 12 volt bulb for troubleshooting. I kept asking myself, why the voltage drop of 3 volts after the fuse. Before the fuse it reads about 16 volts, but after the fuse it reads only 3 volts! I suspect that the fuse has not, because the fuse can neither yes or no and no in between. The first circuit that I checked was the starter circuit, but all the elements to be checked well. I even desolder pin 9 of IC TL1451ACN converter just to make sure this is not what the voltage IC demolished. This problem really challenges my troubleshooting and repair skills, because almost all suspect components already checked to work. Even the transistors start circuit (C945 and A733), I directly replaced, lest they breakdown under load. The only thing I didn't check was the fuse! Using my meter placed on the fuse, instead of low or zero ohm ohm reading I 1.012 Kilo ohms! Ive got a surprise and could not believe that a fuse can actually go in high ohm instead of open circuit. I always thought that the fuse is either close or open circuit. A fuse with zero ohms ohms transformed into high, which has dropped to 16 volts 3 volts! Ive come across lots of this type of fuse, but it is the first time a fuse changed high resistance. Replacing the fuse that set the LCD monitor DELL E152Fpb back to life. The lesson here, do take it as a component is still in good working condition. You should check with your meter and if you still suspect the component gives problem, simply replace it with a known good and retest the equipment. Semiconductors can breakdown when the voltage under full operating.Copyright © 2009