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Dell E151fpb Lcd monitor arrived in with the criticism of no electricity but on very carefully glance at the Liquid crystal display you could see a quite light-weight (blur) white flashes throughout the display and the electricity LED is not lit. Eliminating the protect was a bit uncomplicated when compared to other versions. As standard anytime the mainboard and ability board have been uncovered, I would appear for any bulged capacitor, darkened place, a loosen connector and and so on. However this monitor boards appears to be beautifully ok. The subsequent move was to independent the ability/inverter board with the major board. Electric power was utilized to the electricity board and I could hear a delicate ‘chip-chip’ audio. When I evaluate the 12 volts line with a electronic multimeter, the readout was about 7- 8 volts which was pretty uncommon. In truth this is fantastic information to us mainly because we know what the following step that we really should make.
Now we could use a 12 volt automobile brake light bulb to exam at which part that is leading to the low voltage output dilemma. If the Lcd monitor made to operate on 18 or 24 volts then you could use a light bulb from the big trailer. A faulty ingredient in possibly major or secondary aspect could trigger very low output voltage. Eradicating the fuse as revealed in the picture and join the bulb between the supply line and the chilly floor could convey to which segment is giving dilemma. You could use this technique but first you have to confirm that the secondary filter capacitors, TL431 adjustable precision shunt regulator ic, optoisolators and parts encompassing the optoisolator is performing in advance of you continue to use the gentle bulb.
When the ability is on the mild bulb even now do not lit and the seem still could be read. This indicates that the main aspect is owning problem and we can leave the inverter/significant voltage region and totally concentrate to locate the faults in the primary area.
This is the time to truly take a look at your essential electronics skill simply because you now know at which area the fault is and you just have to use your competencies to identify the specific undesirable component. There have been not considerably elements in the primary side, and you could simply look at all of them in much less than 20 minutes. Just after checking all the components I was surprised that all of them analyzed all right. Main winding of swap mode electrical power transformer rings 8 bars which implies superior and even the uc3842b PWM electricity IC changed the electric power continue to will never get the job done! It was rather complicated to troubleshoot this sort of difficulty where you are hundred percent guaranteed that the principal side is giving issue nonetheless you could not locate out the culprit.
Given that I experienced checked all the elements and could not locate the fault, the only way that I could do is to direct exchange the semiconductor devices these as the diodes, scr, fet, and transistors. From professional I do encountered semiconductor components breakdown when underneath total running voltage. A single by a single of the semiconductor parts I replaced and power on every single time I experienced modified it to see if the bulb gentle up or not. Guess what, you would not believe that what have I just found-a defective 2N7000 fet! The times I have replaced this fet and electrical power on, the bulb promptly light-weight up. I could not imagine it was this faulty fet that leads to all the output voltages to fall! I was so pleased that I finally solved the difficulty and who understands this could be a widespread fault for all DELL E151Fpb Lcd monitor- so make sure you take take note to all Lcd monitor repairer.
I started to verify yet again the faulty 2N7000 fet with my analog meter and peak electronic atlas element analyzer and the outcome is however the same-analyzed good! Just like flyback transformer, the very best tests tools to take a look at Fet and other elements is really the gear by itself since it runs on whole operating voltage, frequency, sign and etc. What you have just figured out from in this article was that if all the suspected elements analyzed fantastic, the only way to expose the reality is to immediate change the parts. Hope you enjoy this short article and much more superior content to arrive day to day! Wishing you all the most effective and joyful repairing!
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