Fixing a burnt-out or dark section of Christmas lights requires troubleshooting the specific sub-circuit where power has been interrupted. For traditional incandescent lights, plug the strand in and use a specialty battery-powered light repair tool to inject an electrical pulse into faulty bulb shunts, forcing the shunt to close and relight the section. Alternatively, inspect every socket in the dark segment to find loose bulbs or broken filaments, and replace them with fresh spares. For modern LED strings, check the plug fuses and connector wires, as individual sealed diodes cannot be easily replaced.
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