Repairing the Dell Inspiron 1501 LCD Screen Monitor while using complaint of display shutdown after matter of moments (power LED still on) wasn't difficult. Normally if this kind of problem happens, we'd first suspect the inverter board, then a filter capacitors and ultimately the primary board. A defective with a lamps and also a faulty TL1451AC PWM IC or inverter ic may caused the display to shutdown too. If the lamp is defective, it's going to send a feedback to pin 3 or 14 of TL1451AC IC and caused it to stop producing output signal thus the display just shut down as soon as you switch it on. The power board is applying a SG6841D pwm ic along with a FQPF7N80 power fet . If it power section blow, it is extremely all to easy to troubleshoot since it has fewer components. You can even use other area numbers to substitute the energy fet.For more data,Dell Inspiron 1520 LCD Screen
As usual, after opening the coverage, I'd first search for any burnt components, loose connector, cracked board, dry joints and etc before doing the voltage test. Alternatives lamps, I would check it last because lamps were seldom spoilt. Upon scanning for just about any bad components before beginning the voltage test, I discovered a filter capacitor that have changed into darker color. While using ESR meter revealed the ESR ohm has shoot up to 12 ohms. This filter capacitor located at C922 using the price of 1000 micro farad 16 volt. Without the ESR meter you can use the digital capacitance meter. The value that I got from measuring the not so good capacitor was 57 microfarad. If you don't have ESR meter, provide you with one-it's fast and accurate.Dell Inspiron 1521 LCD Screen
Now, now you ask why a filter capacitor can cause the display to shutdown? Should you carefully understand the picture, I've drawn the yellow route to demonstrate how the voltage is flowing. By the way, the voltage with the bad filter capacitor line is 12 volt. The voltage passed by having a SMD transistor inside the start circuit and flow right to pin 9 (VCC) of TL1451AC IC. In order to permit the 12 volt circulation through the transistor and achieve the vcc pin from the ic, first, a 'on' signal should be sent from the main board to trigger the transistor. If no signal send to the transistors (off signal), both transistors is not started up with no voltage will observe from the ic. Thus when the main board or some of the start circuit components spoilt, you will see power but no display as the TL1451AC would not send signal towards the Royer type L, C resonant and boost circuit, so no high voltage produced by our prime voltage transformer and will also result in no display.Dell Inspiron 1525 LCD Screen
Inside the above case, the LCD Monitor display shutdown was because of the ripple as a result of bad filter capacitor. The ripple caused the TL1451AC IC being unstable and in the end shutdown the output signal. Replacing merely the filter capacitor solved the DELL E153Fpc LCD Monitor shutdown problem.Dell Inspiron 1526 LCD screen Conclusion, don't always presumed that LCD Monitor is very tough or hard to repair. From your above article, you might note that the caused from the shutdown problem only agreed to be a poor capacitor. In the event you fully understood how Dell Inspiron 1545 LCD Screen Monitor works, then chances that you should successfully repair the monitor is incredibly high but again it all depends about the accessibility to spare parts. Should you ever run into any LCD Monitor sent to you for repair initially, go ahead and start troubleshoot it. That knows eventually Dell XPS M1330 AC Adapter Monitor repair could become one of the main income source for you as well as your business.For much more details, you ought to check out: laptopbatteriesinc
没有评论:
发表评论