Alternativa para reducir el Voltaje de los LEDS (backlight) en Televisores

hello everyone, in this video today we will see how to modify the LED strips of a TV to be able to feed it with less voltage and not with such high voltages with which these televisions are designed they are more than seen, that these designs make LEDS work at full capacity in terms of voltage and milliamps because of that they have less lifespan and it has become a frequent failure This modification may be useful when the original source cannot be repaired for any reason.

and it will also serve to adapt these LED strips to lamp televisions as you can see here I have my "guinea pig" this TV that is broken from the display but the lighting panel is in good condition so it will help us to do the tests right now you can see itworking with its original lighting in the end we will compare it with the result of the adaptation and remember NOT to advance the video so they don't lose details.

I just want to tell you something very fast for those who watched the previous videos where I show some evidence experimenting with a capacitive source and then with a fountain and recovered from a Chinese lamp well those projects were discarded for security reasons that's why the videos were deleted and you should not try to do as a solution since there is a high risk of electric shock for the user That's why I bring you this modification that is safer and more efficient We will start by seeing some tests that we do to the original TV source here we are going to see theTV with its original source and this is the image in the end we will compare it with the finished modification I have the multimeter on the 200 scalevolts of direct current let's measure voltages let's turn on the television checking the source that delivers voltage tothe LEDS and when turning on the LEDS we see that it measures 42 .

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43 volts here at this point we see a high voltage of 145 volts at that voltage this source rises, without the charge of the LEDS and conforms to the required voltage we will use this other 24 volt source to turn on the LEDS now we will verify the amperage, the multimeter is already on the 10 ampere scale we interrupt one side of the line towardsthe LEDS and is already connected to the alligators atMultimeter we turn on the TV and we have a reading of 0.

35 amps that are 350 milliamps we will do a test with an external panel this one has 8 LEDS per strip are connected to the original source we have connected the TV and inidle state has 23.

3 volts let's turn on the television the panel lights up and we have a50.

5 volt reading this shows that the voltage of this source is high and adapts to the consumption with respect to the amount of LEDS so this is what we will do at the top we see the serial connection if they were for 3 volts each LED we need a total of 48 volts for it to work but if we modify it by connecting it in parallel we would only need half that is 24 volts let's do it physically with this external panel so they can see the connection change we connect the wires one to the positive ofthe secondary source and the other land we have it connected to the multimeter tomonitor voltage we connect the television and we have the presence of 25.

3 volts and are connected to the panel in series but they don't turn on .

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because we need approximately 48 or 50 volts we will make the modification connecting the LED strips in parallel .

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as we saw in the scheme I disconnect momentarily .

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I placepositive with positive of the two LED strips and we also connect .

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the negatives that's it, we connect the voltage again and we see that they light with goodintensity we check the voltage and there are 21.

8 volts, powered only withthe secondary source Now we are going to modify the LED stripsof the television here are the cables we will make some cuts here we join the positive and the negativewith the first strip we will do the same with the second I will put some increases because they fell short here it is .

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you have to insulate these ties with thermal insulation because the insulating tape peels off over time Let's now test the voltage.

are alreadythe cables connected to the secondary source and also to the multimeter .

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now we will connect the TV we have the cable here .

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we connect light well with a voltage of 20.

5 volts We will now check the amps .

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we already have everything connected.

let's plug in the TV and we see that it starts with 0.

46 0.

40 which is 400 milliamps is morethan the original source we will try to lower it a bit, we will do it with a resistance of low value here we will do the tests on thesealligators will test different resistance values we connect again and now I will first try connecting directly we see that it has 0.

36 360 milliamps andhere we will be verifying the changes let's try first with this 100 ohms it's a lot but for them to see thedifference the intensity drops and we only have one record .

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a reading of 50 milliamps now we will place a 6.

8 ohms and we see that it turns on with 250milliamps this .

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it's ok you should see the image but .

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let's go up a little more so that the image is closer to the original I will place this 2.

2 ohms ok we see that it has 320 milliamps isless than 350 of the original let's finally check the voltagealready with the resistance of 2.

2 ohms we connect it illuminates very well and we see that it hasa reading of 19.

7 much better and the lighting is very good let's try not to overheat after a few hours of trying we see that almost nothing heats up .

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let's arm the television now ok, let's do a preliminary test and we have connected the LEDS panel only to the secondary source through the2.

2 ohms resistance we connect the television there it is .

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but it turns on directly We will now see how to turn the LEDS on and off now we need the LEDS toturn on and off just like the TV on televisions in which thesecondary sources they are activated just like the TV there will be no problem to connect the LEDS but we saw that in this model .

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the secondary source the voltage has it present all the time and then we must find a voltageunder 3.

3 or 5 volts that are activated after turning on the TV and when turning off the TV returns to 0 volts we will use the relay circuit that we saw in the previous tests I will show you the scheme and then we will connect it for the final test so in this television model we must find a low voltage that is activated after turning on the TV can be 3.

3 or 5 volts here I found it in this regulator we will only verify that the voltage ispresent at this point after the TV is turned on and off .

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return to 0 volts let's connect we havethe black tip connected to the chassis and place the positive tipto that regulator we proceed to turn on the television .

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and we see that we have 4.

93 volts 4.

90 on the TV .

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let'sturn it off and when we turn it off we will see that it returns to 0 volts now here you can see the scheme it is already installed now we will see the connections the positive that activates the relay goes to the secondary source the relay negative goes to ground and also to the LEDS negative the cable that drives the relay through the transistor goes to the 5 volt source and the switch wires connect one to the secondary 24 volt source through 2.

2 ohms resistance the other side of the switch goes directly to the lighting panel to the positive of the LEDS the TV is connected .

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let's turn it on here we can see the image and we will compare it now with .

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the image of the original source here we have the comparison and you can seethat there is not much difference you can also reduce the voltage furtherif we divide the led strips into two parts as you can see in this scheme, onlywe would need 12 volts to make them work well this modification has been a successI want to thank colleague Rick Espinoza for your collaboration for the realization of this video and remember that I always try to help you contributing ideas solutions and alternatives so I hope you support me too SUBSCRIBING TO THE CHANNEL if you have not already done so leaving his "I LIKE" if they liked the Video and SHARING so that it reaches more people that's all this time see you soon if GOD allows it.

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