how to test lcd inverter
Troubleshooting Dell LCD Monitor E173FPB power blink symptom is fairly easy if you know the correct procedure for testing. There are two sections on the monitor that can cause power to blink. This is primary or secondary section or even sometimes the two sections may be defective. So, to isolate as the section you're having difficulty. I used a 12 volt bulb automotive (brake light) and connected between the line of 12 volts and the cold mixture with the fuse removed. If the bulb flashes of opportunity is still very high, the engine side of the main problems.
Do not neglect the line voltages, and another 3.3 and 5 volts. If all components in a short circuit that is supplied with 5 and 3.3 volts, the energy may also flash. If the bulb 12 volt, we can assume that the power supply works well and something short intermediate line makes the power supply to blink. If the bulb turns on and continues to check the power section, you will lose your time. You should now concentrate on the circuit side of the section and the C5707 four transistors driving the transformer high voltage on the board of UPS.
Only these transistors as the horizontal output transistor (HOT) in the CRT monitor that drive the transformer where he worked so hard and the chances that the ventilation is very high. Verification of four transistors Off Board have found one of them reading in short-circuit with an ohmmeter .. The faulty transistor can achieve by itself or may be others that developed a short circuit in a defective high voltage transformer but the four processors High Voltage verified to be agreed with the sound and ohmmeter testing.
Now, here's the secret I will reveal. If you just replace the defective transistor only, the chances are very high transistor or other transistor C5707 broken again. Usually what a technician does not test the other transistors with either a digital meter or analog. If you use both feet to test transistors then missed the defective transistor because the two counters are not going to be reading transistor HFE. Only Some digital meters have the ability to audit HFE. In other words, you must use the HFE test set of a transistor. Although you can replace the three transistors directly, why not do some detective work to find the cause of the problem?
Atlas analyzer with advanced electronic components, I clearly see the difference between good and bad transistor. A reading of either HFE C5707 transistor 320 to about 390, but the 467 bed bad! The other two C5707 transistors that reading 350. In the above case that the two transistors C5707 have been replaced and you can save the other two. I record in the trial of this LCD monitor for several days and that worked to perfection.
Conclusion – If repair E173FPB DELL LCD Monitor or any other model as E172FPB or E171FPb essentially the method of proof is the same. You can also use this procedure to try other brands of LCD as well.
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