Mathis Carey posted an update 5 days, 9 hours ago
Troubleshooting DELL E173FPB Liquid crystal display Keep track of with power blink symptom is really simple if you know the correct method to examination it. There are two sections in the keep track of that can trigger power to blink. It is possibly main or secondary part or even sometimes each sections can be faulty. So to isolate as which segment is giving problem. I employed an car 12 volt mild bulb (brake gentle) and hook up it amongst the 12 volt source line and chilly floor with the fuse removed. If the bulb still blink probabilities is quite substantial the power main section have dilemma.Do not overlook the other voltages line as nicely these kinds of as the 3.3 and five volts. If any elements shorted that will get the offer from the five and three.3 volts, the energy also might blink. If the 12 volts bulb lights up we can presume that the energy offer is functioning fantastic and one thing shorted further down the line that tends to make the power source to blink. If the bulb lights and you proceed to examine the electricity area, it will be heading to Samsung LCD Display Ankauf Ankaufspreise squander your time. You should now concentrate on the secondary area circuit this kind of as the four transistors C5707 that push the high voltage transformer in the inverter board.Just think these transistors like horizontal output transistor (Sizzling) in the CRT keep track of that push the flyback transformer exactly where it worked so challenging and probabilities for it to breakdown is really large. Examining the 4 transistors off board discovered a single of them have a shorted reading with an ohmmeter.. This transistor can get faulty by alone or it could be some others parts that induced it to develop a limited circuit such as a faulty large voltage transformer but all of the four high voltage transformers checked to be ok with ringer and ohmmeter test.Now, here is the magic formula that I’m likely to expose. If you just exchange the faulty transistor only, chances is extremely large the transistor or one more C5707 transistor will breakdown once more. Typically what a technician does is to examination the other transistors with possibly an analog or electronic meter. If you use both meters to take a look at the transistors then you have missed out on the defective transistor simply because both meters is not going to expose to you the hfe studying of the transistors. Only some electronic meters have the hfe examining feature. In other words, you have to use take a look at the hfe reading of a transistor. Though you can substitute the other three transistors directly, why not we do some detective function to uncover the trigger of the dilemma?Utilizing the Peak digital atlas element analyzer, I could evidently see the different amongst a good and a undesirable transistor. A great C5707 transistor has hfe reading from 320 to about 390 but the bad 1 reads 467! The other two C5707 transistors have studying about 350. In the previously mentioned circumstance only two C5707 transistors were replaced and you conserve the other two. I had melt away in take a look at this Lcd keep track of for many days and it labored properly fantastic.Conclusion- Whether you repair the DELL E173FPB Lcd Monitor or any other product these kinds of as the E172FPB or E171FPB, basically the screening strategy is the very same. You could also use this testing procedure on other brand of Liquid crystal display Keep track of way too.