As for snipping out a third wire... don't. My strings were two quality strings of 100 lights purchased at Costco, and they made it through last season. I am happy to say the lights are still working fine after two weeks. I saw a video a while back that said some lights have a third wire, and that wire can be snipped out without any problem. But don't be too hasty. This is assuming that the first half of the light string is not working. This week we're going to go over an easy to do LED Remote Quick Fix, should your remote hit a snag. I've needed to replace 8 LED's in a single string. So it sounds like you have at least two bad bulbs in the string that doesn't work (at least one in each parallel/half) of the string, and at least one bad bulb in the half of the other string. This can be particularly useful for conveying information in a tight space. Bad LED's will have no faint blue dot of light. It does this by adding the three different colors together. Christmas lights are a real nuisance to repair. Get a Small Screwdriver or Similar Tool. If you do follow these instructions then you take full responsibility for getting electrocuted  - which as mentioned previously can kill you - or for any other risks associated with the activity outlined in this set of instructions. 1 year ago It depends upon how you connected the non-polarized plug. STEP 1. The non working LED will obviously be in the string half that is not working. (with lots of extra exclamation points). The general upper limit for LED's is 20mA so the current level is still reasonable even with the one light removed. Can't one simply put in a "good" led to fix the problem? Sometimes a dimmer switch is involved, other times the flickering happens due to other technical reasons. The tools needed are: STEP 2. Grasp the LED above the plastic covering and pull it until it releases from the fixture. 11 months ago, I have a 60ft string of white LED Christmas lights and a small section of the lights are dimmer than the others. Each cut-point is a marked line with a set of solder pads either side (4 pads for single-colour LED tape, or 8 pads for RGB). If not discard the light. It doesn't matter if it or the section in question lights or not. How can I use the detector? For example, LED strip does not light up … Because LED lights don’t overheat, they greatly reduce your risk of being caught in a Christmas tree-related fire. With the faulty LED light removed the light string half that did not work is now working minus 1 light. By combining the primary colors (red, green, and blue) in a multi-chip LED, a lighting fixture, or any other LED device, and controlling each color’s intensities, an LED light can produce several colors. If you are having issues getting anything to work in your LED installation or your lighting is inconsistent go over this trouble shooting … Make sure your strips are plugged in the correct way. The brightness of the LED while you test it will also indicate its quality. Once you have all the lights replaced, plug the string back in to make sure you got them all. She began her career as a Web designer and also specializes in audio/video mixing and design. If you don't have a multimeter to use, a simple coin cell battery holder with leads will let you know if your LED lights are still working. Cant figure this one out. LED's do not like a lot of current so besides the LED there is also a current limiting resistor in each light. My angel is supposed to have Blue wings, Amber trumpet, Yellow halo and the rest White. If your spouse whacks you with the rolling pin because you destroyed his/her Christmas lights guess what - your fault. LED leads, can cause the leads to corrode over their year of storage. This, combined with the tinned steel (!!) My voltage detector indicates power right to the last bulb and the next plugged into it works. OR does the string of leds and their resistors self rectify the ac line current when the string is working, but when open the ac is detectable? Pull out the first light that is marked with tape from the light fixture. 1 year ago. Let me know if this proves out to you. 1 year ago. If you have a string of LED lights that are of the non-replaceable type you may think all is lost. Just to make sure test for voltage between the next set of lights just to make sure. I accidentally came across a solution to finding which are bad and which are good LED's in a string. But you might have it at the far end and loose it as you move towards the plug. As soon as you find a wire between the lights that no longer has voltage detected the light prior is likely the light that is fault. As I mentioned earlier the removal of a light will increase the current and LED's do not like high current. The second and third light in the string remain connected and in tact but the first light, where the input power enters the string, was severed as was the female outlet used to connect adjoining lights. It will take a bit of studying of the string and its plug if it is not a polarized plug. Select the item you wish to change LED settings on. Let me emphasize the words 'faint' and 'tiny' again. Remove the affected bulbs. Your LED Christmas lights will now function perfectly once again. Bad LED's will have no faint blue dot of light. Testing LED lights is simple with a digital multimeter, which will give you a clear reading of how strong each light is. Inside a bi-color LED light, there are two light-emitting dies, including three leads and a common cathode or anode. Finish replacing the bulbs and test your work. If all of the LED strips colours are working except for just one colour, and this is affecting that colour all along the strip (e.g., the whole length of the Red colour LEDs are not working), then there is either a fault with the soldering of the Red -ve cable onto the strip’s PCB, or else Red cable is faulty from the strip to the receiver, or the connection of the Red cable into the receiver is faulty or disconnected. Try to replace a couple of LED light bulbs with the CFL lights. (Onboard LED on the motherboard or component) Select the individual LED/component. I am working with a 70 light string which consists of two parallel circuits that have 35 lights each in series. Now, examine in a darkened room or dark shade. It is not part of the instructions. When you say LED, are you referring to the newest strings of lights out there, or just the lower wattage mini lights that have been available for a long time? LED lights are less expensive to run and last longer than incandescent lights. Never attempt to fix a light strand that is plugged in; you may be electrocuted. For example, if you burn yourself with the soldering iron that is your fault. Reply There are typically two different types of LED bulbs that are … Christmas decorations are colorful, twinkling and festive. If you get lead poisoning from eating the lead solder this is you fault. When one of the LED's fails the circuit breaks which affect all the other lights (half of them) that are in the same series circuit. Drag the tab on the color wheel to change the hue and saturation. I thought leds were direct current devices. RGB LED stands for Red, Green and Blue Light Emitting Diode. It doesn't matter if it or the section in question lights or not. Let me illuminate the solution. When I was sure of the LED that was faulty I unplugged the lights from the electrical source and then put a sewing pin through the wires going into the LED to bypass the light in question. So if you are not qualified to repair devices that require electricity then don't attempt the following repair. The fist step is to find the LED that is no longer working. The plastic socket can be brittle, so exercise caution. With the polarities right, we can turn the lights on. There should be voltage detected at the live wire going into the first light. In each case, one leg of the LED had broken off (seems like a sucky material design mistake.) On my string the voltage between the LED and the common is 3V. Flickering of LED lights could be very annoying. Kate McFarlin is a licensed insurance agent with extensive experience in covering topics related to marketing, small business, personal finance and home improvement. Plug in the LED string. So using a "light fixer" for the original mini lights, remove the bulb from the socket and touch the leads to the light tester. There should be no voltage detected. Try to find the neutal line that only attaches to the last light in the string segment and make sure its plug prong goes in the neutral side of the outlet receptacle. What is going wrong? Heat Shrink Tube From the first light, in addition to the power in cord, are 3 more wires (like common lamp cord). It can be a total hassle when a light bulb burns out in a hard-to-reach lighting fixture in your home. ), Reply M5 lights are the mini lights you may be familiar with. You don’t have to do anything else; cutting at the cut-points will close the LED tape circuit automatically. The string of lights I had did not have "replaceable" bulbs. Since … Use a secondary string of lights as replacement bulbs. If you find a burned out light, you don't have to replace the whole strand. This will increase the current that goes through the remaining lights because we have eliminated part of the resistance. For someone who went through 2 of 5 semesters of Digital Electronics Tech 10 years ago, I have forgotten just about everything. In this article you will learn the root causes of LED flickering and how you can fix this effect. This is what gives the appearance of colorful lights like purple led light bulbs, sharpie light bulbs, and pink led lights for car. Typically if your LED lights simply "don't work" it is not because the products are defective but due to a basic wiring mistake or overlook. LED Christmas lights last longer and provide more color options than regular lights, but they burn out on occasion. on Step 7. Go back to the original strand of lights and find which ones are burned out. 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