The DELL E151FP LCD came in with no power symptom and upon checking the cover I saw several components which were burnt. R623 (4.7 ohm) burnt at the side and you can however recognized the resistor color code. The existing sense weight (0.68 ohm) outer layer portion had came down and slightly burned and also the filter capacitance C605 (68uf 400v) one in every of the pins had became rusty and got off following I tried to desolder the pin.
This isn’t a fresh product and that i think different personal professionals had resolved the matter. But for those who have not run into this issue, you could use the task to troubleshoot and fix every other kind of LCD with energy problem. I will 1st remove the service electrical unit and ensure it rings okay with wang jones flyback tester. I take to that 1st consequently of I don’t need to waste my time examining substitute areas and later entirely seen that the center electric device is that the triggered of the energy problem.
Once it bands fine i’ll stay all of the extra diode. For the data most LCD power popular the twin schottky form diodes and the specification frequently in the 10 to 20 amp with about 40 volts. Nevertheless I really do push into some designed sq evaluate however uses the immoderate fast healing sort diodes within the secondary section. Be sure you realize a way to check a conventional diode and a schottky diode.
When I proved that the secondary aspect elements square evaluate all tested ok, i’d then go to eliminate all of the components within the primary aspect. Some components within the primary part you’ll be able to check up to speed just as the bridge rectifier and fuse. If you are new in LCD repair philips tv repair london would suggest you to check all parts off panel (with a lead taken from board). With in this way you’ll make certain that all components that you’ve scanned through are okay. These square gauge the parts that I discovered 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.
Complete was 9 parts and it took National state but thirty minutes to determine most of the pieces in major aspect. Now is enough time to look for sacrifice parts. Following disbursement regarding 5 minutes within the component area I were able to look for all areas except the facility junction transistor SSS6N60A. Though that half selection is typically employed in switch function power provide, my electric dealer does not need that in stock. I would then browse through the semiconductor knowledge guide to find equivalent portion number.
After every one of the new parts have put within their unique place or place and needless to say with the energy transformer soldered, I don’t straight away turn on the energy supply. I’d 1st work with a 100watt light-weight bulb linked asynchronous with the live line. The best position to position the sunshine lamp is that the fuse dish space. Remove one in most of the blend lead and join the sunshine bulb across it. Energy it on and begin to go through the bulb.
When it brightly illuminated and keeps that way for couples of minutes then there is however problem in the ability supply. But, if the light doesn’t light-weight in virtually any regard then this can be a good indicator that the ability present can be operating. Use a multimeter (analogue or electronic meter) to position the red probe at the heart green of the Schottky diode (and dark probe to cool ground) and switch “On” the power. If you get some right voltage reading from the outputs and also the light does not light-weight in virtually any regard, then this established that the energy present is working.
Change off the facility provide and join straight back the blend and move the LCD “On” once more. I’m really certain the LCD may now work. Accepting the productivity Schottky diodes are stand alone type (normal extremely fast healing diode) then you need to put your red probe to the cathode and dark probe to cool ground. If you are troubleshooting the DELL E151FP LCD and other brands, you can generally use the procedure provided above to fix the ability offer problem.
That strategy in many cases are also use to fix alternative varieties of power provide too. No matter what kinds of energy present you are troubleshooting, just make certain you identify a method to check always and always check the essential electric parts. In the event that you actually missed one, sad to say you would maybe not have the ability to solve the situation or it would only get you several of one’s precious hours to complete the job. Pleased shopping!