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How exactly to Repair Sharp LCD LL-T15G2 Energy Adapter

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The customer grievance of the Sharp LCD LL-T15G2 LCD Check was no energy within the power adapter and LCD screen. The minute I separate the casing I found the inner cowl and which means power offer board had burnt mark thereon. First i believed it positively was hit by lightning but upon fastidiously study the table I came across that the orange cable was pressing one in every of the connection rectifier diodes pin. You may conjointly clearly see this 1 a part of the track had broken.Image result for tv mechanic

Remarkably the blend did not start signal! The darken board should be clear with representative answer before I start getting down to confirm the assumed parts. First always check that the filtration condenser haven’t any voltage examined with the assistance of your meter, if there’s voltage you’ll launch it with a two.2 e ohm 10 watt resistor place throughout the capacitor leads. That is really a usual process as I don’t want any one of my viewers who are new in that area to have release through his body from the capacitor charge.

After I have established there are no more voltage in the filter capacitor, I will then use my analogue meter set to x1 ohms to test on the power FET (part number is 2sk3114). Place the black probe to the centre pin of energy FET and the red probe to the other two hooks one at a time. The meter shouldn’t register any examining, if there are readings; it could be the ability FET has shorted. To be able to confirm it the easiest means is to get rid of the field-effect transistor from circuit and always check it. If the capability field-effect transistor didn’t hit, probabilities is incredibly high one’s heart beat breadth modulation IC (PWM) KA3842B is sweet. The resistors within the primary facet checked to be okay too.

Following this have a look at i will have the ability to utilize the Dick Smith flyback tester to position across the ability electrical device coil to check on if the turning is shorted or not. The readout was eight whole bars and this proves that not solely the initial rotating is ok, the extra diodes as well. If both the initial twisting or the extra diode shorted, the meter readout would drop to very low or fully goes off.

Today, i will only scan all of the electrolytic capacitors with my ESR meter though I realized that the possibilities for the capacitors to travel poor is incredibly trim as a result of the situation was small circuit involving the orange cord and one of the connection diodes and it will be would not influence the capacitors. Okay returning to the link diodes, tv technician always check always the diodes whilst it however on boards with (your) analogue meter set to x1 ohm. It should perhaps not register two related readings.

If you are inconclusive concerning the examining you’ll usually equate to the contrary diodes. Checking the diodes up to speed I came across anyone to be flawed and that i removed all of them and replaced with four new 1N4007 diodes. For your data, if among the diodes shorted or opens circuit, you’ve got to replace another 3 diodes as well. I do not understand you, but from my decades of electric restoration experienced, I actually do found issue where following sending right back the apparatus (after changing one of many

For consistency reason and to stop the customer from sending right back the apparatus for warranty maintain, the very best is to replace them all if discovered one diode to be faulty. That diode isn’t expensive assess to the full time reduction link degreed it will have an effect on your own name too as an electric fixer. After the replacement of the brand new diodes, you desire to problem straight back the damaged track with the assistance of a cause cut from a two w resistance. Before you turn on the ability offer, you need to generally connect a one hundred w light-weight light to check.

The explanation for using the bulb is to stop the power source parts that you have just replaced to blow again in case if there is small world anywhere within the ability offer that you just have incomprehensible to envision. Merely eliminate the fuse and join the two cables of the sunshine light across it.

Now start the capability give and see the sunlight bulb. If the lamp illuminated remarkably and stays there for a protracted time, what this means is there are still problems in the ability supply. When I plug the twelve potential product jack to the LCD Monitor, there was number power. I presumed the short world in the energy pack/adapter could have triggered the LCD inner fuse to blow as well.

True enough, when distance up the LCD cowl and check on the fuse, it found to be circuit. Fixing the internal blend and the power source problem set the Sharp LCD Check right back your again. Not exclusively you gained the satisfaction from repairing the power provide, you get paid conjointly from your web visitors also! That’s all for it, take care my friend.