In fact, the keyboard can be repaired in a few minutes at a small cost (tools and equipment preparation: electric soldering iron, needle-nosed pliers, screwdriver and two pins).

First preheat the soldering iron for use, then carefully pry the letter keys "F" and "J" off the keyboard with a flat screwdriver and fix them on the workbench. Then cut the needle about half a centimeter away from the needle cap with needle-nosed pliers. Clamp the needle cap with pliers in the left hand and aim at the original protruding part of the "F" key. Hold the pin with an electric soldering iron in your right hand and carefully push the pin in half. Then put down the needle-nosed pliers, hold the "F" key in one hand, and press the needle cap directly with the electric soldering iron in the other hand to push in, leaving only the needle cap on the "F" key. Do the same thing and push the second pin into the "J" key.