Find The Bad Bulb If one of your LED light strands isn’t working, it’s probably just because it has a bad bulb. There should be two. The plug at the end of the set works fine, so current seems to travel to the end of the wires correctly. this is the cheapest construction method dating way back from incandescent light strings. On a strand, there are usually multiple braided cords to bring power to the lights. Sometimes only a section of the lights will go out, making your job pretty easy. The only way to fix the problem is to find the bad bulb. Only 1/3 of my 150 net lights are off. Also half of the lights and receptacles didn't work either. I have two animated outdoor lighted reindeer decorations that I bought last year and when I put them out this year I found that only half the lights work. When it's time to break out the Christmas lights, you may notice a few bulbs have gone dim. Checked the outside circuit beaker box and said only hale of the current is coming in. Net lights are also ideal for this application because they only need to drape the top and front. If only 1/3 of the whole thing is off, it might just be a burned-out bulb or broken wire on that wired sequence. My DIL just told me that the new commercial lights my DS bought last year are only half working! However, I had a constant hot attached to the previous wiring so the light would remain on 24/7. Those were NOT cheap! I bought a "Light Keeper Pro" tool that's supposed to fix Christmas lights but it didn't do anything. If one bulb dies, it can cause the rest of the strand to stop working. Many Christmas lights are sold with spare fuses for this purpose. Hello: I just had my T8 florescent light fixture (ballast) changed to use with LED bulbs. Fix Christmas Lights That Are Half … My understanding is that the individual branches are in parallel whereas the lights in each branch is in series. If you find one, open it and inspect the very small fuses inside the plug. These lights are key. Repairing these lights won't be easy, but with a little determination and know-how, it can be done.  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). Why? Never use a fuse with a higher rating. The LEDs are probably strung in series. If your spares have escaped from the holiday box, take the blown fuses to an electronics store and ask for a replacement. The electrician installed the new ballast and capped off the constant hot and just made the light work with the switch that controls the other lights in the room. One of them was like that as soon as I plugged it in and the other one became that way as well after about 15 minutes. Community Answer. Find an exact replacement. If you replace the end bulbs and the string of lights still does not work another bulb is the problem. A bulb tester made for Christmas lights will be a worthwhile purchase. 100 bulbs is a popular configuration. Look for the lights that have a splash of red on the bulb near the bottom. If half the string is out, look for the dead bulb closet to the end. 100-light strings typically use 3A fuses, but it's best to confirm your fuses' rating with a store employee. Most net lights can be connected end to end and with LED net lights you can often connect numerous net lights together, which means you can outfit a large hedgerow utilizing only one plug outlet. Gosh, the old outdoor lights we used to buy lasted for years and years! I have a set of Christmas lights for which the second half doesn't light up. Lady Emma. : i just had my T8 florescent light fixture ( ballast ) changed to use with LED bulbs do.! Parallel whereas the lights and inspect the very small fuses inside the plug at the end of the is! 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