How to replace and re-solder a mechanical keyboard switch

How to replace and re-solder a mechanical keyboard switch

Mechanical keyboards are generally more responsive than their counterparts, and occasionally a switch fails. Here’s how to replace it without getting rid of the keyboard. It takes some tools and a bit of knowledge, but you absolutely can do it.

To take out a switch and install a new one, you’ll need to be able to open the keyboard to access the PCB, desolder the faulty switch with a soldering iron and a pump, remove the switch and insert a new one, and finally, solder the new switch. instead. If you’ve never soldered anything before, don’t worry. While it helps to have a bit of welding experience, the welding you’ll be doing here is pretty straightforward.

Selecting the Proper Replacement Switch

Before you begin, you will need to find a replacement switch for the key that is not working properly. This is more complex than you think. If your board uses Cherry MX Blue switches, you just have to find another Cherry MX Blue switch, right?

Broadly speaking, yes. Matching the manufacturer and the “color” of the switch is the most important part of getting a good understanding of the switch. But you’ll also need to match the specific switch to your specific board. The next big choice is mounting style.

This is known as board or PCB mounting: different switch housings are designed to be inserted directly into the keyboard’s circuit board, or into a metal or plastic plate that sits on top of the circuit board to protect it. On the left in the image below is a keyboard with plate-mounted switches; on the right, is a keyboard with PCB-mounted switches.

PCB-mounted switches include two additional plastic pegs on the bottom for added stability, which are not required for board mounts. You can usually install a PCB-mounted switch on a plate keyboard with no problem, even if extra plastic tips are in the way, you can just cut and sand them down. But you should not install a board-mounted switch directly on the PCB because it will be unstable and more likely to malfunction.

Now let’s talk about LEDs. If your dash includes lighting, you’ll also need to replace the LED; they are not built into the switches. Most commercial keyboards install the LEDs either above the switch, in a specially formed hole in the plastic of the switch housing, or below it, directly on the PCB and shining through a clear case. 

Finally, if your keyboard uses switches with clear plastic cases for the bottom-mounted LEDs, you’ll also want to get replacement switches with clear plastic. Otherwise, the opaque switch will block the light. These switch variants are often referred to as “RGB” even though they don’t include the LED lights on the switches.

Step one: Remove the keyboard case

To start this process, remove your keyboard from your PC and place it on a clean workspace. You will now need to remove the outer casing to access the PCB.

This process will be different for different keyboards. On our example keyboard, a fairly typical mod-friendly Vortex Poker 3 layout, all I have to do is remove the keys and then remove six screws. If you have a more elaborate gamer-style keyboard, you may need to pry up the plastic tips and remove the feet to access the retaining screws.

A more complex Razer keyboard, with a much more frustrating disassembly process.

As you work, make a note of the particular switch you want to replace. Sometimes PCBs aren’t labeled, and once the keys are off, it can be hard to tell one switch from another. A mark on the back of the PCB with a Sharpie won’t hurt.

Once you’ve removed the case and removed the wires connecting it to the PCB, you should have something like this: a PCB with a bunch of switches, plus a metal plate if your keyboard uses it.

Step Three – Prepare for Desoldering

Now plug in your soldering iron to heat it and get your bomb ready. Lay your PCB face down on your work area, with the back of the board facing up and the switches resting on the table. Prepare your sponge or brass to clean.

When your iron is hot enough, wipe off any oxidized residue so the tip is clean and shiny. Then press the tip against the electrical pin of the corresponding switch to heat the old solder until it turns liquid. Be careful not to touch the non-conductive material on the PCB itself, just the solder. Have your pump primed and ready.

When all the solder is hot and liquefied, quickly move the iron away and place the bomb on top of the pin. Activate the pump to suck the liquid solder away from the electrical contact before it cools and resolidifies.

You will probably have to repeat the above step two or three times to remove all the old solder from the electrical contact completely. Do so, then repeat the step for the second contact on the switch. Remember to clean the soldering iron tip regularly as you work. Do this again for the switch LED pins, but only if the LED is mounted above the switch. If it’s mounted below the switch, you can leave the LED in place.

Might be you also Interested to Read: What are hot-swappable switches?

Step Four: Remove the Switch

With the solder removed, you can now physically remove the switch. If the keyboard uses PCB-mounted switches, you should be able to simply pry it out with your fingers or small pliers. If the switches are mounted on a plastic or metal plate, you’ll need to press a couple of small tabs on the switch to release it.

Solder is a sticky material that dries quickly. If the switch doesn’t pop out, it may be because you weren’t able to suck up all of the soldiers and it’s still held deep in the electrical contact. Repeat step three and try again. You may also need to do this for the LEDs on the old switch.

When you remove the LED, if you plan to use it again, make a note of its orientation and place it on the table so you know which pin went on which side. If you replace the LED with the anode and cathode pins reversed, it won’t work. When you have the old switch free, set it aside.

Step Five – Install the New Switch

Check your replacement switch and make sure its two electrical pins are straight and upright. Now lower it into place on the PCB. If your keyboard uses a plate, you will need to “snap” it down with the electrical pins perfectly aligned. Check it against the other switches to make sure it is properly aligned and in place.

Flip the board over. Now you are going to use your soldering iron to add a new solder to the corresponding electrical contact and close the circuit of the switch. Clean your iron, place it on the first switch pin to heat the metal for a few seconds, then carefully guide the solder wire into place so it melts around the pin and onto the electrical contact.

There should be enough molten solder in place to surround the electrical pin, but not so much that it spills onto the non-conductive material of the circuit board. Clean your iron and repeat the process with the second pin.

If your switch has a top-mounted LED and you are using the old one, carefully feed it through the switch’s plastic housing and into the contact holes, making sure to line it up as it was before. If you’re using a new LED, do the same thing, but be sure to align the anode and cathode correctly. There should be a guide printed somewhere on the PCB that identifies which hole is positive (anode) and which is negative (cathode). The longest wire is always the anode. You can bend the wires slightly once they are threaded through the hole to keep them in place while you solder. When you’re done, if you used a new LED, cut the wires close to the soldering point.

Step Six – Test the Switch

Without reassembling the keyboard, carefully move your circuit board with the attached switches to your computer and plug it in. You can test the switch by simply opening a web browser or word processor and pressing the switch over and over again. If the computer is registering your keystrokes correctly, you’re good to go. If not, you haven’t correctly completed the circuit with your solder, and you’ll need to go back to the previous steps to see where you went wrong.

Step Seven – Reassemble Your Keyboard

Remove the keyboard from your PC again. Put it back in its case and close it, reversing the process you needed to go through for your specific keyboard in Step One. Replace the keys, go back to your computer and connect the keyboard. You are ready to go.

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