Open the cabinet door. Unscrew the hinges from the door with a Phillips screwdriver or electric drill.
Place the cabinet door on a flat work surface.
Position the new hinge on the back of the cabinet door on the hinge side, so it is about 2 inches from the top or bottom, but not over the old screw holes.
Twist a screw into each hole in the new hinge using a Phillips screwdriver or drill.
Position the door back over the cabinet and hold it closed.
Screw the hinge into the cabinet.
Fill in any old screw holes on the cabinet or door with wood filler. This step is optional and only necessary to fill in old holes that are obvious on the exterior of the cabinet. Smooth the filler into the hole, and wipe away any excess. Sand the filled holes once the filler is dry with medium-grit sandpaper. Stain or paint the filled holes so they match the rest of the cabinet.