If you believe you have a broken light on your Christmas tree, there are several methods you can try to locate it. First, check the ground underneath the tree to see if any lights have fallen or been knocked off. If you have an LED tree, you can also use a flashlight to inspect the individual light bulbs on the tree and locate any that may be burned out or otherwise not working properly. Additionally, you can look for any visible signs of damage or wear and tear on the light strands or bulbs themselves, which could indicate a problem. Once you locate the broken light, you can then replace it with a new one.