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With This Way You Can Be Sure That All Components You Have Scanned By Means Of
The DELL E151FP LCD Monitor arrived in with no power symptom and upon opening up the cover I noticed few elements that were burnt. R623 (four.seven ohm) burnt in the aspect and you could nonetheless recognized the resistor color code. The current sensation resistor (0.68 ohm) outer layer partly had arrived off and slightly burnt and the filter capacitor c605 (68uf 400v) among the pins had became rusted and arrived off when I attempted to desolder the pin.
This is not a new design and I think a lot of skilled techs had solved the problem. But for those that haven’t come across this challenge, you may make use of the process to troubleshoot and repair another type of LCD Monitor with power challenge.
I'll very first eliminate the power transformer and ensure it rings alright with dick smith flyback tester. I do that 1st due to the fact I don’t need to waste my time checking other components and later only found out which the energy transformer will be the triggered in the energy dilemma. As soon as it rings okay I'll measure all the secondary diode. For your information and facts most LCD Keep track of energy supply extensively applied the dual schottky type diodes and also the specification typically inside the 10 to 20 amp with about 40 volts. Nevertheless I do come across some created are still makes use of the ultra rapidly recovery type diodes within the secondary area. Be sure you realize the right way to examine a standard diode along with a schottky diode. Refer back again to my webpage within the diode section and search for testing schottky diode post. I will then verify for that ESR of electrolytic capacitors too.
When I confirmed the secondary facet elements are all examined alright, I'd then proceed to get rid of all the elements in the primary facet. Some elements in the main facet it is possible to check on board such as the bridge rectifier and fuse. If I’m new to the LCD Keep track of product I'd check all components off board (having a lead eliminated from board). Using this way you may be sure that all elements you have got scanned by means of.
These are the components that I located defective; fuse-2A, R615-0.68 ohm, R613- 1K, R612-47 ohm, R623-4.7ohm, D604-1N4148, Q601-SSS6N60A, C605-68UF 400V and IC601-UC3842B. Total was nine elements and it took me less than 20 minutes to check all the components in primary facet. Now is the time for you to search for spare parts. Soon after investing about 5 minutes inside the spare portion compartment I managed to acquire all elements besides the power resistor color code. Although this component amount is mainly utilised in switch mode energy supply, my electronic supplier doesn't have this stock. I would then browse via the semiconductor databook to research for equivalent part amount. In the e-book, it indicates to use the K1118 as substitute. Right after all components have place into their unique place or location and certainly with the energy transformer soldered, I do not immediately change around the energy provide. I'd initial utilize a 100watt light bulb linked in series with the reside line. The perfect spot to place the light bulb will be the fuse holder region. Eliminate among the fuse lead and connect the light bulb across it. Energy it on and begin to observe the bulb. If it brightly lit and stay that way then there is still trouble within the energy supply. However, if the bulb does not light at all then this is a wonderful sign which the power provide might be functioning.
Make use of a multimeter to place at the secondary facet with energy on. For those who get some correct voltage studying from the outputs plus the bulb does not light in any way, then this confirmed which the power provide is working. Switch off the energy supply and connect again the fuse and flip the LCD Monitor on again. I’m very confident the LCD Monitor will now work.
No matter if you are troubleshooting the DELL E151FP LCD Monitor or other brands, you can often make use of the process provided over to restore the power provide challenge. This approach could be even use to fix other varieties of energy supply too. No matter what forms of power supply you're troubleshooting, just make certain you realize the way to examine and test the basic electronic elements. For those who at any time miss 1, unhappy to say you would not be able to resolve the issue or it may possibly just just take you numerous of the precious hours to complete the job. Pleased hunting!
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