As Soon As I Confirmed That The Secondary Facet Elements Are All Tested Alright, I Would Then Move Forward To Get Rid Of All The Components In The Primary Side
The DELL E151FP LCD Monitor came in without any energy symptom and upon opening up the cover I saw few components that were burnt. R623 (four.7 ohm) burnt in the facet and you can nonetheless recognized the resistor color code. The current sense resistor (0.68 ohm) outer layer partly had arrived off and somewhat burnt as well as the filter capacitor c605 (68uf 400v) among the pins had grew to become rusted and arrived off when I tried to desolder the pin.
This isn’t a new design and I think lots of skilled techs had solved the problem. But for people who have not encounter this predicament, you might utilize the procedure to troubleshoot and repair another kind of LCD Keep track of with energy difficulty.
I will first eliminate the power transformer and ensure that it rings alright with dick smith flyback tester. I do that very first since I do not would like to waste my time checking other components and later only discovered out the energy transformer will be the caused with the energy challenge. When it rings okay I’ll measure all of the secondary diode. For your data most LCD Keep track of energy supply extensively made use of the twin schottky sort diodes and the specification in most cases inside the 10 to 20 amp with about forty volts. Yet I do run into some designed are nonetheless uses the ultra quickly recovery sort diodes in the secondary portion. Be sure that you know how you can check a standard diode and a schottky diode. Refer back to my web page inside the diode part and search for testing schottky diode write-up. I’ll then examine for that ESR of electrolytic capacitors also.
When I confirmed that the secondary side components are all examined alright, I’d then move forward to eliminate all the components inside the main aspect. Some components in the main side you’ll be able to examine on board like the bridge rectifier and fuse. If I’m new towards the LCD Monitor model I’d verify all elements off board (with a lead eliminated from board). With this particular way you might be sure that all components you may have scanned by way of.
These are the components that I found 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. Whole was nine components and it took me much less than 20 minutes to examine all of the elements in primary side. Now will be the time to research for spare components. After spending about 5 minutes inside the spare portion compartment I maintained to come across all components apart from the energy resistor color code. Though this component amount is mostly applied in swap mode energy provide, my electronic provider does not have this stock. I’d then browse via the semiconductor databook to search for equal part amount. In the ebook, it suggests to use the K1118 as substitute. Following all components have place into their authentic spot or place and needless to say with the power transformer soldered, I do not quickly switch around the energy provide. I’d 1st utilize a 100watt light bulb linked in series using the live line. The very best location to place the light bulb is the fuse holder location. Remove one of the fuse lead and connect the light bulb throughout it. Energy it on and start to observe the bulb. If it brightly lit and stay that way then there is still situation in the energy provide. However, in the event the bulb does not light in any way then this is actually a superior signal that the power provide may well be functioning.
Utilize a multimeter to location in the secondary facet with power on. If you happen to get some accurate voltage reading through the outputs and the bulb does not light in any respect, then this confirmed which the power provide is working. Change off the energy provide and connect back the fuse and turn the LCD Keep track of on again. I’m really certain the LCD Keep track of will now function.
Regardless of whether you might be troubleshooting the DELL E151FP LCD Keep track of or other manufacturers, you can actually generally use the process given previously mentioned to fix the power provide situation. This method can be even use to fix other sorts of power supply as well. Regardless of what types of power supply you might be troubleshooting, just ensure that you realize how to check and check the simple electronic components. If you happen to ever skip 1, depressing to say you would not have the ability to resolve the issue or it may well just just take you a number of of the precious several hours to total the task. Pleased hunting!
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