Replacing one mechanical keyboard switch can restore a key that no longer registers, remove an unpleasant scratchy feel, or change the sound and resistance of a keyboard. The procedure is relatively simple on a hot-swappable board and more involved on a soldered one. Before starting, identify which type of keyboard you have and choose a compatible replacement switch.
Why replace a mechanical keyboard switch?
A switch may need replacement if a key becomes unreliable, feels rough, makes unusual noise, or stops registering altogether. You may also want to replace switches as a typing experiment, such as changing the feel of a frequently used key or installing a different switch style across the board.
A typical mechanical switch contains a housing, stem, spring, and internal contact components. These parts determine characteristics such as travel, actuation force, tactility, and sound. A replacement can improve the affected key, but it must be mechanically and electrically compatible with the keyboard.
Check whether the keyboard is hot-swappable or soldered
On a hot-swappable keyboard, switches plug into sockets on the PCB and can be removed without soldering. This is the easiest arrangement for a first repair.
On a soldered keyboard, each switch is attached to the PCB with solder. Removing it requires heating and clearing the solder before the switch can be taken out. If you are not comfortable using a soldering iron, consider getting assistance, since excessive heat or force can damage the PCB or lift its contact pads.
Tools and replacement parts
For a hot-swappable board, gather:
- A keycap puller
- A switch puller
- A compatible replacement switch
- Good lighting and a small container for loose parts
For a soldered board, you will also need a soldering iron, desoldering pump or solder wick, and optionally flux. Isopropyl alcohol and a suitable cleaning tool can help remove debris, but allow all cleaned parts to dry completely before reconnecting the keyboard.
Check the replacement switch’s pin layout and physical design before installation. Two-pin and three-pin switches are not interchangeable in every plate and PCB combination, so compare the new switch with the one you are removing.
Replacing a switch on a hot-swappable keyboard
- Disconnect the keyboard. Unplug it or turn it off if it is wireless, then place it on a stable, well-lit surface.
- Remove the keycap. Use a keycap puller and pull straight upward. Avoid twisting the keycap, which can place unnecessary stress on the switch stem.
- Release the switch. Position the switch puller over the top and bottom tabs of the switch housing. Squeeze the tabs and pull the switch straight upward with gentle, even pressure. Do not pull on the stem or force the switch sideways.
- Inspect the socket and pins. Look for bent pins, broken parts, or debris. A bent pin can often be straightened carefully, but do not force a pin into the socket.
- Install the new switch. Align its pins with the socket openings and press the switch straight down until it is fully seated. If it will not slide into place, remove it and check the alignment rather than applying more pressure.
- Test before replacing the keycap. Reconnect the keyboard and confirm that the key registers and moves normally. Once it works, press the keycap straight onto the stem.
Replacing a switch on a soldered keyboard
Disconnect the keyboard and open its case according to the board’s design. Locate the two switch solder joints on the underside of the PCB. Heat each joint and remove the molten solder with a desoldering pump or wick. Work patiently and avoid prolonged heating, which can damage the board.
After the solder has been cleared, gently remove the old switch from the top side. Insert the replacement through the plate and PCB, ensuring that the pins are straight and the switch is fully seated. Solder each pin with a clean joint, reassemble the keyboard, and test the key before reinstalling the keycap.
Troubleshooting after the replacement
- The key does not register: Disconnect the keyboard and check that the switch is fully inserted and that neither pin is bent. On a soldered board, inspect both solder joints.
- The key works intermittently: Reseat the switch and test another known-good switch in the same position if possible. This helps distinguish a faulty switch from a socket or PCB problem.
- The switch feels scratchy or sounds unusual: Check for debris, damage, or a switch that is not seated evenly. Replace the switch if the problem remains.
- The key feels different from the others: Confirm that the replacement has the intended switch type and that the keycap is seated correctly.
Taking your time during removal and checking alignment before applying pressure are the most important parts of the job. A hot-swappable board makes switch changes straightforward, while a soldered board requires more care and equipment. In either case, a correctly installed replacement can restore a failing key and help tailor the keyboard’s typing feel.
