See the previous section for instructions. Some LED string lights have non-removable bulbs. Contrary to what you might think, this can be more of a boon than an inconvenience.

When it's time to hang Christmas lights, you may notice a few dead bulbs. Repairing these lights won't be easy, but with a little determination and know-how, it can be done.

Lighting up Christmas: The quick fix for broken light sets The LightKeeper Pro, from Ulta-Lit Tree Company, is a tool that repairs most sets of malfunctioning miniature Christmas lights.

Most new packs of Christmas lights come with a replacement fuse—which should give you a clue as to how common fuse problems are with these things. A blown fuse also causes the entire string to ...

If your Christmas lights aren't working, you may have tripped a circuit breaker. Or, try changing the fuse and checking for broken or missing bulbs.