how to find the burnt bulb in christmas lights

To find the burnt bulb in Christmas lights, first check the entire string of lights to see if any are out. If the string of lights is not functioning properly, look for the burnt bulb by checking each bulb individually. Start at the beginning of the string and work your way down, checking each bulb by pressing your finger to each one. If a bulb does not light up when you press your finger to it, you have found the burnt bulb. Replace the bulb with a new one and check to see if the string of lights is functioning properly again.