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Pleased Hunting
The DELL E151FP LCD Keep track of came in with no power symptom and on opening up the cover I saw few components that had been burnt. R623 (4.seven ohm) burnt in the side and you could still acknowledged the resistor color code. The current perception resistor (0.68 ohm) outer layer partly had arrived off and somewhat burnt plus the filter capacitor c605 (68uf 400v) one of the pins had grew to become rusted and came off when I attempted to desolder the pin.
This is just not a new product and I believe lots of skilled techs had solved the problem. But for people who haven’t run into this situation, you could make use of the process to troubleshoot and restore almost every other kind of LCD Monitor with power dilemma.
I'll very first eliminate the energy transformer and make certain it rings alright with dick smith flyback tester. I do this initially mainly because I do not desire to waste my time checking other components and later only found out that the power transformer will be the triggered with the energy predicament. When it rings okay I'll measure all the secondary diode. For your specifics most LCD Keep track of power provide widely made use of the dual schottky type diodes along with the specification normally in the 10 to twenty amp with about forty volts. On the other hand I do run into some developed are nonetheless utilizes the ultra quick recovery type diodes in the secondary section. Ensure you realize the best way to examine a standard diode and a schottky diode. Refer back again to my internet site inside the diode part and research for testing schottky diode write-up. I will then check for your ESR of electrolytic capacitors as well.
When I confirmed the secondary side components are all tested alright, I would then move forward to eliminate all the elements within the main facet. Some elements within the main side you can verify on board such as the bridge rectifier and fuse. If I’m new to the LCD Keep track of model I'd verify all elements off board (with a lead eliminated from board). Using this type of way you might make sure that all elements you could have scanned through.
These are the components that I located 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 9 elements and it took me less than 20 minutes to check all of the components in primary aspect. Now may be the time for you to research for spare parts. Just after shelling out about 5 minutes inside the spare part compartment I maintained to locate all components besides the power resistor color code. Although this part amount is primarily made use of in swap mode power provide, my electronic supplier does not have this stock. I would then browse via the semiconductor databook to research for equivalent component number. In the ebook, it suggests to use the K1118 as substitute. After all elements have put into their unique spot or location and of course with the energy transformer soldered, I don’t immediately change around the power provide. I would first make use of a 100watt light bulb linked in sequence with the live line. The very best location to place the light bulb may be the fuse holder location. Eliminate one of the fuse lead and connect the light bulb across it. Power it on and begin to observe the bulb. If it brightly lit and stay that way then there is certainly nonetheless situation in the power supply. Nonetheless, if the bulb doesn’t light whatsoever then this is actually a very good signal the energy supply could possibly be working.
Utilize a multimeter to location in the secondary facet with power on. If you get some accurate voltage reading in the outputs as well as the bulb doesn’t light whatsoever, then this confirmed which the energy provide is functioning. Switch off the energy provide and link back the fuse and turn the LCD Monitor on once more. I’m really sure the LCD Keep track of will now function.
Whether or not you might be troubleshooting the DELL E151FP LCD Monitor or other manufacturers, it is possible to continually utilize the process provided previously mentioned to fix the power provide situation. This strategy can be even use to restore other sorts of energy provide too. Regardless of what varieties of energy provide you're troubleshooting, just be sure that you know ways to verify and check the standard electronic elements. In the event you actually miss one, sad to say you'd not have the ability to solve the problem or it could just just take you a number of of one's valuable hours to total the task. Pleased hunting!
Statistics - It costs $50 to find out whether a spare part is required for repairing a failed device is...?
It costs $50 to find out whether a spare part required for repairing a failed device is faulty or not. Installing a faulty spare part causes damage of $1000. Is it on average more profitable to use a spare part without checking if:
(i) 1% of all spare parts of that type are faulty?
(ii) 3% of all spare parts of that type are faulty?
(iii) 10% of all spare parts of type are faulty?
Please explain the answers. Thanks!
lets say there are 100 spare parts
i) it would mean 1 faulty spare part
so checking = 50* 100 = 5000
not checking = 1000 * 1 = 1000
1000 < 5000 more profitable to use without checking
ii) it would mean 3 faulty spare parts
50 * 100 = 5000
1000 * 3 = 3000
3000 < 5000 more profitable to use without checking
iii) it would mean 10 faulty spare parts
50 * 1000 = 5000
1000 * 10 = 10000
10000 > 5000 no not more profitable, in this case it is less profitable not checking
hope this helps
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