PROBADOR DE LEDS UNIVERSAL Hazlo tu mismo

Hi, I'm Jesus Lopez Today I have a video that I think will be very useful for .

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everyone who devotes to the repair of televisions also for students andelectronics fans it is a tool now indispensable inour test bench I bring you a universal LEDS tester circuit with it you can try from an LED individually, like this up to several LEDs with parallel connection, such as common 12-volt LED strips and also the LED strips with connection in series like those that bring the televisions With this you can also try all the backligth without uncovering the TV This design has several advantages, it is very safe, it can be easily done and there are few parts and components required but the best thing is that I will show you how to do it with pieces recovered 100% so that in this way there will be no cost in what is the basic circuit the list of parts and the diagram for to elaborate the basic circuit, I will show it at the beginning with this list of parts and the diagram, you can already make it but those who want to see this tester already finished and running with some adjustments made to facilitate its use come with me and watch the full video I will provide you with a second list of parts and I am sure that it will be more useful to you to perform your tests well then, we start with the video Resistances are 2 watts now I will show you where we can get the pieces we can retrieve them from a DVD player mainly of backward model, ofthis type that have a power or independent voltage card there may be some minimal differences in the values ​​of the capacitors that go in the AC input but they will not be relevant, remember that this will only be a circuit for tests this source will provide 90% of the pieces and also they are already assembled on a card so it will save us time we will only add other components also recovered, as we will see next this is the dvd player cardhas most of the components Fuse, capacitors, shock coil, diode bridge and electrolytic capacitor we will use only that part so we'll cut that section I cut it easily with a cutting pliers but they can do it as they see fit here we have another similar card the input capacitors may vary a bit The electrolytic capacitor of the two cards is 47 microfarads at 400 volts but it could also be 68 or up to 100 microfarads we will proceed to make a cut before the diode bridge to add the components that areindicated in the diagram is the R1 and the C3, we will connect them inseries on a small punched card the card is already cut, now we will connect the cable that comes from the resistance to the C2 and the c3 cable to the diode bridge so you can see better, mark thepolarity of the electrolytic capacitor to place the rest of the pieces, they are 2 diodes and a resistance that will go towards the probes I will show you below in the diagram I will physically show you the placementcorrect of these diodes the diode that is connected to the negative side of the capacitor will go with the marked line of the diode towards the card and the other period that goes to the positive will be placed with the line out we will connect later the resistance to that diode and we will place the corresponding cables, red to positive and black to negative here you can see how they wereconnected the cables are already in place and nowwe will proceed to isolate them with some stretches of thermo fit and heat will be perfectly ready to make connection let's first do a performance test here we connect the multimeter with some alligators We are going to perform the test of a single led, it is a red LED of high luminosity and here you can see the voltage that is about 175 volts when we do the test, you will see thevoltage drop to the voltage that the LED needs there you are seeing that it is 2.

1 volts let's perform another quick test tothree 12-volt LEDs we connect the tips and see that they light and we have that voltage is 13.

5 volts let's see the second list of parts to be able to finish our tester here we have a medium box where it will goplaced the circuit this damper we already had it in the first list we will need a PUSH switch switch, normally open (NO) and also the banana or jack phillips tickets already installed the damper, it switch and the inputs for the tips of the multimeter the red wire will be connected to the switch but first we will fix the card with silicone in the lid of the box is already fixed and now we are going to make the connections and we will proceed to cover and you're ready to perform our tests I will share an extra modification that you make to the tester this due to the difficulty to perform the test with this type of tips and at the same time press the button to facilitate its use, I decided to place a step switch in parallel with this button this will allow the current to pass through the probes and at this point in the red I will place a smaller button with this we can do the test directly without using this button The observation that I will make will be that .

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having the swith in ON there will be presence of voltage so they should be careful in their handling but it is very convenient since it facilitates the test to be able to do it directly at the tips we are going to see that modification and then we will perform the test of several types of LED And a lighting panel of a television we will connect the other switch of theFollowing way I got a small switch forplace in the probe remove the nut, since you do not need it so you can install it better a cut was made in the cable to connect it and proceeds to secure with tape to isolate Here you can see the finished pointready to perform the tests we will proceed to perform the tests here we have three 12-volt LEDS we will perform the test here we see that it lights Now let's try the whole strip of LEDS in its three colors already with the switch is easier thistype of tests here we see the blue LEDs the LEDs of red color and finally the green ones now we will proceed to test the LED strips of a television We start by testing one individually there we see the voltage that is 2.

7 now we test two we have 5.

5 and and we will try 3 we can also try the whole strip and whatwe will do in your connector there you can see the voltage and that all the LEDs turn on Now let's try the whole panel oflighting of a 32-inch TV here we are testing thefirst strip of LEDS the second strip of LEDS, here is atension fall because we already detected a fused LED that is bridged and this is the third strip of LEDS let's try all the strips .

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the three LED strips and we see that they ignite without anyproblem with a voltage of 61 volts we are going to remove the bridge that we made in the LED that we had detected damaged and we will perform one more test here we see that if you turn on the first line and the second does not turn on precisely because of that melted LED the third SI turns on and if we try to try all will not turn on Well, I think that's enough with that, leave your comments and questions about it see you in the next one if GOD allows it, see you soon.

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