For light strings that commonly have over 50 bulbs, they are constructed in 2 or more continuous circuits. If you discover that the bulb is burned out or damaged, replace it with a new bulb, but be sure it has the proper voltage rating or you risk damaging the whole light set. Why is this? Asked By: Dong Groneberg | Last Updated: 29th January, 2020, Don't pull too hard on the wires. On a somewhat related note, I’m finding it difficult to tape these lights to the ceiling (stucco house paint, type ceiling, but very cheaply done). They should be firmly in place in the grooves of the fuse socket. The only way to fix the problem is to find the bad bulb. Solve this problem by either: Find and replace the red-tipped bulb that someone installed in … If you find one, open it and inspect the very small fuses inside the plug. When half a light strand is out it is usually a defect in the wire, apparently when a bulb burns out what happens is that the electricity bypasses that bulb to reach the rest of the lights, however if the channels in the wire are not working properly it will not allow the electricity to pass through to the rest of the string. Once you’ve found which one, leave it out and replace the other with a known good one. How? As for hanging the lights, I’d recommend using small plastic drywall or stucco anchors with screw eye hooks. These lights are key. If the entire string is out, start with a bulb at the end of the string. Noma does not give appropriate directions on the maintenance of their string lights. If the fuse isn't the problem, there's a problem with a bulb. First, plug in the lights. You should hear a click each time. The flasher bulb will only cause the circuit it is a part of to flash on and off. Next, check out our handy holiday decorating tips here. Once you’ve found which one, leave it out and replace the other with a known good one. Yes, the LED Keeper can find the culprit. Then determine which string is out by unplugging first bulb #1 (the closest to the plug), then bulb #2 and see which one makes the lit string go out. Masking tape works, somewhat. It means, there is either unconnecter/badly connected wire somewhere or one bulb(or more) is out. These are not necessarily old lights. Replace it or push it in tightly. Use a clean cloth or tack cloth to wipe away any sanding dust, then try plugging in the lights again. In older lights strings, though, a single dead bulb may cause the entire string to go dark. Plug the lights into an electrical outlet.  If one of your light strings isn’t working at all, or if only half of the lights are working, unplug the string and look for a small access door on one side of the male plug (the one with the prongs). It depends. Replace the blown fuse with a replacement fuse of identical size and rating. A string of lights typically has two parallel circuits and the power is carried through from one end to the other. How much does it cost to play a round of golf at Augusta National? lights still don't work. So, you’ll have three wires–one common, one for one string and one for the other. Does anyone know why half a string of Christmas lights light up and half do not? Tighten the bulb gently and checked to see if the rest of the strand lit up. Duh! If a bulb is missing in a circuit only the bulbs in series of it will go out. BTW the above instructions apply to the common configuration of having every other bulb belonging to a given string. If all or part of a string of lights is dark the problem may be a broken filament or a faulty shunt. As November and December roll around, you might see strands of lights everywhere -- on Christmas trees, houses, shrubs, bushes and even the occasional car!Have you ever wondered how these lights work? How do I remove a broken lightbulb from the socket? I put a new bulb in the first light that doesnt work, but it does no good. It can be quite time-consuming to replace individual bulbs until you find the culprit causing the problem. Why are there 3 wires on Christmas lights? That seems like a lot of work. Every strand of LED lights I own have this problem and they are only 1 or 2 years old. The known good bulb becomes a tester as each bulb is replaced individually until the string lights up again. If one of your LED light strands isn't working, it's probably just because it has a bad bulb. Then, how can you tell if a Christmas light fuse is blown? Sadly, I cannot reproduce that effect. If the string still doesn’t light, you might have another bad one. 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