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Fixing the DELL E153Fpc Lcd Monitor with the complaint of display screen shutdown just after few seconds (electrical power LED continue to on) was not complicated. Normally when this type of difficulty occurs, we would first suspect the inverter board, then the filter capacitors and and finally the major board. A faulty in just one of the lamps and a faulty TL1451AC PWM IC or inverter ic may possibly induced the exhibit to shutdown as properly. If the lamp is defective, it will deliver a suggestions to pin 3 or 14 of TL1451AC IC and prompted it to prevent generating output signal thus the exhibit just shut off after you switch it on. The electricity board is making use of a SG6841D pwm ic and a FQPF7N80 energy fet . If this power area blow, it is quite easy to troubleshoot due to the fact it has less elements. You can also use other portion quantities to substitute the power fet.
As typical, immediately after opening up the go over, I would to start with verify for any burnt components, free connector, cracked board, dry joints and and so forth just before executing the voltage check. As for the lamps, I would verify it last due to the fact lamps have been rarely spoilt. Upon scanning for any undesirable elements ahead of setting up the voltage examination, I found a filter capacitor that experienced turned into darker shade. Employing the ESR meter uncovered the ESR ohm has shoot up to 12 ohms. This filter capacitor located at C922 with the value of 1000 micro farad 16 volt. If you do not have the ESR meter you can always use the digital capacitance meter. The value that I acquired from measuring the poor capacitor was 57 microfarad. If you never have ESR meter, make confident you get one particular-it can be fast and correct.
Now, the question is why a filter capacitor can result in the screen to shutdown? If you meticulously see the photograph, I’ve drawn the yellow route to present you how the voltage is flowing. By the way, the voltage at the terrible filter capacitor line is 12 volt. The voltage passed by means of a SMD transistor in the commence circuit and movement straight to pin 9 (VCC) of TL1451AC IC. In purchase to let the 12 volt to move by the transistor and reach the vcc pin of the ic, to start with, a ‘on’ sign should be sent from the main board to induce the transistor. If no signal deliver to the transistors (off signal), both transistors can’t be turned on and no voltage will comply with by means of the ic. Therefore if the most important board or any of the start out circuit factors spoilt, there will be electric power but no display since the TL1451AC would not deliver sign to the Royer form L, C resonant and improve circuit, so no higher voltage produced by the superior voltage transformer and this will direct to no display screen.
In the earlier mentioned scenario, the Liquid crystal display Monitor exhibit shutdown was thanks to the ripple because of the undesirable filter capacitor. The ripple induced the TL1451AC IC to be unstable and at some point shutdown the output signal. Changing only the filter capacitor solved the DELL E153Fpc Liquid crystal display Monitor shutdown problem.
Summary, you should not often presumed that Lcd Monitor is incredibly tough or tough to maintenance. From the earlier mentioned report, you could see that the brought about of the shutdown difficulty was only a poor capacitor. If you fully comprehended how Lcd Monitor operates, then possibilities for you to properly maintenance the monitor is extremely large but yet again it depends on the availability of spare pieces. If you ever appear across any Lcd Monitor sent to you for restore for the initially time, go ahead and start off troubleshoot it. Who understands a person working day Lcd Monitor maintenance could turn out to be one of the key resource of earnings to you and your organization.
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