how to fix pre lit christmas tree lights

If the pre-lit Christmas tree lights have burned out or have gone out, you can try replacing the burned-out bulb with a new one. If the problem is with the whole strand, you can use a multimeter to check the resistance of each light bulb to find the one that is causing the problem. You can also try replacing the fuse in the pre-lit tree to see if that fixes the issue. If none of these solutions work, you may need to purchase a new set of lights.