Allen Estrada posted an update 5 days, 9 hours ago
Troubleshooting DELL E173FPB Liquid crystal display Keep an eye on with power blink symptom is quite effortless if you know the right method to examination it. There are two sections in the monitor that can cause energy to blink. It is either main or secondary section or even occasionally equally sections can be faulty. So to isolate as which part is giving dilemma. I utilized an auto 12 volt light bulb (brake mild) and link it in between the twelve volt source line and cold ground with the fuse eliminated. If the bulb nevertheless blink odds is quite higher the energy primary section have difficulty.Do not forget about the other voltages line as effectively such as the 3.3 and 5 volts. If any components shorted that receives the source from the 5 and 3.three volts, the electricity also may blink. If the 12 volts bulb lights up we can assume that the electricity provide is doing work fantastic and one thing shorted further down the line that can make the energy supply to blink. If the bulb lights and you keep on to verify the energy section, it will be going to squander your time. You need to now concentrate on the secondary area circuit these kinds of as the four transistors C5707 that push the higher voltage transformer in the inverter board.Just consider these transistors like horizontal output DATEN Vernichtung Smartphone transistor (Hot) in the CRT keep track of that drive the flyback transformer where it labored so difficult and probabilities for it to breakdown is really higher. Examining the 4 transistors off board identified one particular of them have a shorted reading with an ohmmeter.. This transistor can get faulty by by itself or it could be some other individuals factors that brought on it to produce a brief circuit these kinds of as a defective large voltage transformer but all of the 4 high voltage transformers checked to be all right with ringer and ohmmeter check.Now, right here is the magic formula that I’m heading to reveal. If you just replace the defective transistor only, possibilities is extremely substantial the transistor or an additional C5707 transistor will breakdown once more. Generally what a technician does is to check the other transistors with possibly an analog or digital meter. If you use equally meters to examination the transistors then you have missed out on the faulty transistor since each meters will not expose to you the hfe looking through of the transistors. Only some digital meters have the hfe checking feature. In other words and phrases, you have to use check the hfe looking through of a transistor. Although you can change the other three transistors straight, why not we do some detective work to find the result in of the issue?Utilizing the Peak electronic atlas part analyzer, I could plainly see the different in between a very good and a bad transistor. A very good C5707 transistor has hfe reading from 320 to about 390 but the bad a single reads 467! The other two C5707 transistors have looking through about 350. In the earlier mentioned case only two C5707 transistors had been replaced and you help save the other two. I had burn up in take a look at this Lcd monitor for a lot of times and it labored properly fantastic.Summary- Whether or not you restore the DELL E173FPB Lcd Monitor or any other model this kind of as the E172FPB or E171FPB, fundamentally the tests approach is the identical. You could also use this testing process on other brand of Liquid crystal display Check also.