Dell E173fpb LCD Monitor How To Repair Easily
Troubleshooting DELL E173FPB LCD Monitor with energy blink symptom is sort of easy if you understand the fitting procedure to test it. There are two sections in the monitor that may cause energy to blink. It's either major or secondary section or even sometimes each sections may be faulty. So to isolate as which part is giving problem. I used an automobile 12 volt gentle bulb (brake mild) and connect it between the 12 volt provide line and chilly floor with the fuse removed. If the bulb nonetheless blink chances may be very high the facility primary part have problem.
Do not overlook the other voltages line as properly such as the 3.three and 5 volts. If any components shorted that will get the availability from the 5 and 3.three volts, the facility also may blink. If the 12 volts bulb lights up we can assume that the power supply is working fantastic and something shorted additional down the road that makes the power provide to blink. If the bulb lights and also you proceed to check the ability part, it is going to be going to waste your time. You must now concentrate on the secondary part circuit such because the 4 transistors C5707 that drive the excessive voltage transformer in the inverter board.
Simply suppose these transistors like horizontal output transistor (HOT) in the CRT monitor that drive the flyback transformer the place it labored so onerous and possibilities for it to breakdown could be very high. Checking the four transistors off board found one in every of them have a shorted studying with an ohmmeter.. This transistor can get faulty by itself or it could possibly be some others components that caused it to develop a brief circuit akin to a faulty excessive voltage transformer but all of the 4 high voltage transformers checked to be okay with ringer and ohmmeter test.
Now, here is the key that I will reveal. If you simply change the faulty transistor only, possibilities may be very high the transistor or another C5707 transistor will breakdown again. Usually what a technician does is to test the opposite transistors with either an analog or digital meter. In case you use both meters to check the transistors then you've gotten missed out on the faulty transistor as a result of both meters will not reveal to you the hfe reading of the transistors. Just some digital meters have the hfe checking feature. In other words, it's important to use test the hfe studying of a transistor. Although you possibly can substitute the opposite three transistors instantly, why not we do some detective work to seek out the reason for the problem?
Using the Peak electronic atlas component analyzer, I might clearly see the different between a very good and a foul transistor. A great C5707 transistor has hfe studying from 320 to about 390 but the bad one reads 467! The other two C5707 transistors have studying about 350. In the above case solely two C5707 transistors were changed and also you save the opposite two. I had burn in test this LCD monitor for a lot of days and it labored completely fine.
Conclusion- Whether or not you repair the DELL E173FPB LCD Monitor or another model such because the E172FPB or E171FPB, mainly the testing method is the same. You could also use this testing procedure on different brand of LCD Monitor too.
Dell E173fpb LCD Monitor How To Repair Easily
Troubleshooting DELL E173FPB LCD Monitor with energy blink symptom is sort of easy if you understand the fitting procedure to test it. There are two sections in the monitor that may cause energy to blink. It's either major or secondary section or even sometimes each sections may be faulty. So to isolate as which part is giving problem. I used an automobile 12 volt gentle bulb (brake mild) and connect it between the 12 volt provide line and chilly floor with the fuse removed. If the bulb nonetheless blink chances may be very high the facility primary part have problem.
Do not overlook the other voltages line as properly such as the 3.three and 5 volts. If any components shorted that will get the availability from the 5 and 3.three volts, the facility also may blink. If the 12 volts bulb lights up we can assume that the power supply is working fantastic and something shorted additional down the road that makes the power provide to blink. If the bulb lights and also you proceed to check the ability part, it is going to be going to waste your time. You must now concentrate on the secondary part circuit such because the 4 transistors C5707 that drive the excessive voltage transformer in the inverter board.
Simply suppose these transistors like horizontal output transistor (HOT) in the CRT monitor that drive the flyback transformer the place it labored so onerous and possibilities for it to breakdown could be very high. Checking the four transistors off board found one in every of them have a shorted studying with an ohmmeter.. This transistor can get faulty by itself or it could possibly be some others components that caused it to develop a brief circuit akin to a faulty excessive voltage transformer but all of the 4 high voltage transformers checked to be okay with ringer and ohmmeter test.
Now, here is the key that I will reveal. If you simply change the faulty transistor only, possibilities may be very high the transistor or another C5707 transistor will breakdown again. Usually what a technician does is to test the opposite transistors with either an analog or digital meter. In case you use both meters to check the transistors then you've gotten missed out on the faulty transistor as a result of both meters will not reveal to you the hfe reading of the transistors. Just some digital meters have the hfe checking feature. In other words, it's important to use test the hfe studying of a transistor. Although you possibly can substitute the opposite three transistors instantly, why not we do some detective work to seek out the reason for the problem?
Using the Peak electronic atlas component analyzer, I might clearly see the different between a very good and a foul transistor. A great C5707 transistor has hfe studying from 320 to about 390 but the bad one reads 467! The other two C5707 transistors have studying about 350. In the above case solely two C5707 transistors were changed and also you save the opposite two. I had burn in test this LCD monitor for a lot of days and it labored completely fine.
Conclusion- Whether or not you repair the DELL E173FPB LCD Monitor or another model such because the E172FPB or E171FPB, mainly the testing method is the same. You could also use this testing procedure on different brand of LCD Monitor too.
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