Light Electronic Transformer
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 50W 12V MR16 Halogen Light Electronic Transformer 120V 110V AC 12V Dichroic  US $3.15
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The Current Perception Resistor (0
The DELL E151FP LCD Monitor came in with no power symptom and on opening up the cover I saw couple of elements that were burnt. R623 (four.seven ohm) burnt at the facet and you could nonetheless acknowledged the resistor color code. The current feeling resistor (0.68 ohm) outer layer partly had arrived off and slightly burnt and also the filter capacitor c605 (68uf 400v) among the pins had became rusted and arrived off when I tried to desolder the pin.
This just isn't a brand new model and I think numerous skilled techs had solved the issue. But for those that have not come across this dilemma, you may utilize the procedure to troubleshoot and repair some other type of LCD Monitor with power difficulty.
I'll initial eliminate the energy transformer and make sure that it rings alright with dick smith flyback tester. I do that initially because I don’t need to waste my time checking other components and later on only found out that the power transformer may be the caused from the power problem. Once it rings okay I will measure all of the secondary diode. For the specifics most LCD Monitor energy supply widely applied the twin schottky sort diodes and also the specification often inside the ten to 20 amp with about 40 volts. Even so I do encounter some created are still uses the ultra fast recovery type diodes inside the secondary section. Make certain you realize easy methods to check a typical diode and also a schottky diode. Refer again to my webpage inside the diode portion and search for testing schottky diode article. I'll then check for that ESR of electrolytic capacitors also.
As soon as I confirmed that the secondary side components are all tested alright, I'd then proceed to eliminate all of the components in the main side. Some elements inside the primary side you'll be able to verify on board like the bridge rectifier and fuse. If I’m new towards the LCD Monitor model I would examine all components off board (having a lead eliminated from board). With this way you will make sure that all elements you might have scanned via.
They are the components that I identified faulty; fuse-2A, R615-0.68 ohm, R613- 1K, R612-47 ohm, R623-4.7ohm, D604-1N4148, Q601-SSS6N60A, C605-68UF 400V and IC601-UC3842B. Complete was nine elements and it took me less than twenty minutes to verify all the components in primary side. Now is the time for you to research for spare elements. Soon after investing about 5 minutes inside the spare part compartment I managed to discover all components besides the power resistor color code. Though this part number is primarily employed in swap mode energy provide, my electronic provider does not have this stock. I'd then browse through the semiconductor databook to search for equivalent part amount. Through the ebook, it indicates to utilize the K1118 as alternative. Just after all components have put into their unique place or location and certainly using the energy transformer soldered, I do not immediately change around the power supply. I would initially use a 100watt light bulb linked in sequence with the reside line. The very best place to put the light bulb may be the fuse holder region. Remove one of the fuse lead and link the light bulb throughout it. Energy it on and begin to observe the bulb. If it brightly lit and stay that way then there is certainly nonetheless dilemma in the power supply. Even so, if the bulb doesn’t light whatsoever then this is often a excellent signal that the power provide might possibly be functioning.
Use a multimeter to location in the secondary side with energy on. In the event you get some accurate voltage reading through the outputs along with the bulb does not light whatsoever, then this confirmed the energy provide is operating. Change off the power supply and connect back again the fuse and flip the LCD Monitor on again. I’m particularly sure the LCD Keep track of will now work.
Regardless of whether you might be troubleshooting the DELL E151FP LCD Keep track of or other brands, you could normally utilize the procedure given over to repair the power supply trouble. This strategy could be even use to repair other forms of power provide as well. No matter what varieties of power supply you're troubleshooting, just make sure you realize how you can examine and test the fundamental digital elements. If you ever actually skip 1, depressing to say you would not be able to solve the problem or it might just just take you numerous of your precious hours to total the job. Pleased hunting!
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