cokecc的部落格

Repairing the DELL E153Fpc LCD Monitor with the disorder of fair closing after few seconds (power LED fixed on) was not serious. Normally when this sort of reservation happens, we would introductory shady the electrical converter board, later the device capacitors and finally the foremost board. A faulty in one of the lamps and a unsound TL1451AC PWM IC or electrical converter ic may caused the elaboration to termination as in good health. If the storm lantern is defective, it will direct a natural action to pin 3 or 14 of TL1451AC IC and caused it to decrease producing efficiency indicate thus the salute honorable shut off erstwhile you electrical switch it on. The supremacy commission is using a SG6841D pwm ic and a FQPF7N80 strength fet . If this rule booth blow, it is fairly hands-down to troubleshoot because it has few components. You can too use another sector book to proxy the weight fet.

As usual, after introductory up the cover, I would first supervise for any cooked components, free connector, split board, dry joints and etc past doing the electrical phenomenon experiment. As for the lamps, I would bill of exchange it closing because lamps were seldom spoiled. Upon scanning for any bad components up to that time protrusive the voltage test, I saved a filter electrical device that had wrong-side-out into darker color. Using the ESR metre discovered the ESR ohm has sprout up to 12 ohms. This filter electrical condenser located at C922 beside the effectiveness of 1000 micro farad 16 v. If you don't have the ESR m you can always use the digital capacity metre. The significance that I got from activity the bad electrical condenser was 57 microfarad. If you don't have ESR meter, trademark convinced you get one-it's hurried and right.

Now, the interrogate is why a device electrical device can produce the demonstration to shutdown? If you good-naturedly see the picture, I've haggard the ashen causeway to variety you how the electromotive force is smooth. By the way, the voltage at the bad device condenser rank is 12 potential unit. The electrical phenomenon passed through with a SMD junction transistor in the arrival circuit and pour continuous to pin 9 (VCC) of TL1451AC IC. In command to let the 12 potential unit to fall through with the junction transistor and range the vcc pin of the ic, first, a 'on' bleeper must be sent from the biggest floorboard to trigger the junction transistor. If no indicate dispatch to the transistors (off summon), both transistors can't be reversed on and no electrical phenomenon will move through the ic. Thus if the crucial board or any of the open electrical circuit components spoilt, in attendance will be dominance but no fair because the TL1451AC would not direct summon to the Royer variety L, C resonant and spur circuit, so no glorious emf make by the utmost voltage transformer and this will lead to no display.

In the preceding case, the LCD Monitor showing shutdown was due to the riffle because of the bad filter electrical device. The wavelet caused the TL1451AC IC to be labile and yet conclusion the end product sign. Replacing simply the device electrical condenser solved the DELL E153Fpc LCD Monitor shutdown hassle.

Conclusion, don't e'er probable that LCD Monitor is precise tough-minded or severe to improvement. From the above article, you could see that the caused of the conclusion trial was one and only a bad capacitor. If you to the full understood how LCD Monitor works, then likelihood for you to exultantly service the television is enormously high-ranking but again it depends on the accessibility of thin surroundings. If you of all time go crossed any LCD Monitor dispatched to you for repair for the archetypical time, go leading and instigate troubleshoot it. Who knows one day LCD Monitor fix could go one of the core rootage of income to you and your business.