Power tool repair covers cordless and corded drills, impact drivers, saws, grinders, multi-tools, and related shop gear. Failures usually land in a few buckets: batteries and chargers, switches/triggers, brushes and motors, gearboxes, and worn chucks or blades. Always remove the battery (or unplug) before opening a tool. Match the exact model number stamped on the nameplate — battery platforms look alike across SKUs, but internals and brushes differ. Clean dust from vents first; many “dead” tools are packed with debris that overheated a thermal protector. DIY-friendly work includes battery diagnostics, brush replacement on brushed motors, trigger/switch swaps, and chuck service when parts are available. Brushless motors and sealed gearboxes are harder; if the tool is under warranty, opening it may void coverage. Pick your Power Tool brand and model in the guides section to get part-aware teardown and reassembly steps.