The client grievance of this Sharp LCD LL-T15G2 LCD Monitor was no power within the ability adapter and LCD screen. As soon as I separate the casing I saw the inside cowl and therefore the energy give panel had burned level thereon. First i assumed it definitely was hit by lightning however upon fastidiously study the panel I discovered that the orange cable was pressing one in every of the link rectifier diodes pin. You can conjointly obviously see this one a area of the monitor had broken.
Surprisingly the fuse didn’t start world! The darken table ought to be clean with agent solution before I begin finding down to confirm the suspected parts. First check that the filtration condenser have not any voltage tested with the help of your meter, if there’s voltage you’ll discharge it with a two.2 e ohm 10 watt resistor place over the capacitor leads. That is a regular procedure as I don’t want some of my readers that are new in this field to obtain launch through his human anatomy from the capacitor charge.
After I’ve proved there are you can forget voltage in the filtration capacitor, I will likely then use my analogue meter collection to x1 ohms to try on the power FET (part quantity is 2sk3114). Place the dark probe to the center flag of power FET and the red probe to the other two hooks one at a time. The meter should not register any reading, if there are parts; it could be the energy FET has shorted. In order to validate it the easiest suggests is always to get rid of the field-effect transistor from world and check always it. If the capability field-effect transistor didn’t strike, probabilities is incredibly large the heart beat breadth modulation IC (PWM) KA3842B is sweet. The resistors within the principal facet examined to be okay too.
After this have a look at i will have the ability to use the Dick Johnson flyback specialist to put across the ability electric system coil to test if the twisting is shorted or not. The readout was ten whole bars and that proves that maybe not entirely the very first turning is fine, the secondary diodes as well. If often the first winding or the extra diode shorted, the meter readout might drop to really low or fully moves off.
Now, i may simply scan all the electrolytic capacitors with my ESR meter though I knew that the options for the capacitors to travel poor is amazingly thin as a result of the problem was small enterprise involving the orange line and one of the bridge diodes and it definitely wouldn’t affect the capacitors. Okay returning to the link diodes, panasonic tv repair london always check always the diodes although it still on boards with (your) analogue meter set to x1 ohm. It should maybe not register two related readings.
If you’re inconclusive concerning the reading you’ll usually compare with the contrary diodes. Examining the diodes aboard I discovered anyone to be faulty and that i eliminated these and changed with four new 1N4007 diodes. For your data, if one of the diodes shorted or opens signal, you’ve got to restore one other 3 diodes as well. I do not realize you, but from my years of electronic fix skilled, I do came across problem wherever following giving right back the equipment (after exchanging one of many
For reliability purpose and to avoid the customer from giving back the equipment for guarantee claim, the very best is to replace them all if discovered one diode to be faulty. That diode isn’t costly evaluate to the full time loss associate degreed it should make a splash in your title too as an electronic fixer. Following the alternative of the newest diodes, you need to hitch straight back the broken track with the assistance of a lead reduce from a two w resistance. When you switch on the capability give, you need to generally join a one hundred watt light-weight bulb to check.
The cause of using the light bulb is to stop the power source components that you have only replaced to strike again just in case if you have small enterprise anywhere within the ability provide that you just have incomprehensible to envision. Simply take away the fuse and join the 2 cables of the sunlight light across it.
Today start the capability give and view the sunlight bulb. If the lamp illuminated exceptionally and keeps there for a protracted time, what this means is that there are still problems in the ability supply. When I plug the a dozen possible model port to the LCD Monitor, there clearly was no power. I presumed the small circuit in the ability pack/adapter could have triggered the LCD central fuse to strike as well.
Correct enough, after gap up the LCD cowl and check into the fuse, it discovered to be circuit. Fixing the interior blend and the energy present problem set the Sharp LCD Check right back to life again. Not exclusively you obtained the satisfaction from correcting the capability offer, you get paid conjointly from your web visitors too! That is all for it, be mindful my friend.