how to find blown bulb on christmas lights

Well, first you'll need to find the bulb that's burned out. You can do this by using a multimeter to test the voltage of each bulb in the strand. Once you've identified the blown bulb, you can replace it by following these steps: 1. Turn off the lights. 2. Find the end of the strand that is closest to the blown bulb. 3. Carefully pull out the blown bulb. 4. Insert the new bulb into the socket. 5. Test the strand to ensure it's working properly.