Table of contents

  1. Table of contents
  2. Testing the PCBs
    1. Testing the LEDs
    2. Testing the switches
  3. Introduction
  4. Installing the switches

Testing the PCBs

Now is a great time to function test the assembled PCBs, as any troubleshooting steps you might need to complete will be much easier to do while the plates are still outside of the case.

The TRRS connection will not work yet, as only ony one leg of the jack is connected. You can test this part later.

For the following step, please prepare a pair of tweezers that are conductive. If you don’t have any, you can also use a piece of wire, or a single switch.

Testing the LEDs

If you have installed per-key LEDs, let’s start with testing those. If you don’t have any per-key RGB installed, you can skip to the next section.

  • connect one half to your PC via USB, and observe the LEDs:
  • do they all light up?
  • are the colors correct?
  • can you see a rainbow animation play?

Does everything look fine? Great, go ahead with testing the switches.

If not, reflowing the pads of the LEDs not working should do the trick. Please see Troubleshooting for details.

Testing the switches

To test the switches, we are going to use the VIA interface. All Bastard Keyboards come pre-flashed with VIA, so you don’t have to flash anything.

The default firmware requires the USB cable be connected to the right side of the keyboard. This means that when testing the left side, the keys will be reversed and 1 key (Charybdis Nano) or 2 keys (Charybdis) of the thumb cluster will not work.

Open VIA - please note this only works on chromium-based browsers like chromium, edge, chrome.

After connecting to your device, switch to the key tester page using the stethoscope pictogram, then activate the “Test Matrix” option. Now, you can connect each pair of switch pads in turn, using your tweezers, a wire, or a switch inclined enough.

Did all the keys light up in VIA? Great, proceed to case installation! Not quite perfect yet? Don’t worry, proceed to the Troubleshooting section!


Now that everything is connected together, the next step is to install the switches and the PCBs into the case. The process is exactly the same for both sides, so we will detail only the Scylla side (without trackball).

You may have noticed that we still haven’t done anything with the sensor PCB. This is normal, we will connect it after installing the switches. This is so that it doesn’t get in the way when soldering the switches.

While in theory you can install the switches in any order you like, we outline below what we found out works best.

The case is made of plastic, and will melt if you touch it with your soldering iron. Be careful!

Installing the switches

We will start by detailing a technique to install the switches, and then in which order they should be installed. Please read this whole section first to familiarize yourself, and then proceed to the installation. Otherwise, the process might be more complicated.

When installing the switches, use the following technique:

  • press the PCB against the case, and try to align it as much as possible
  • from the other side, push the switch into the case hole
  • make sure the pins align into the PCB’s holes
  • make sure the PCB is flush against the switch. If your switch has side pins, you may have to push it a bit harder
  • solder the two pins of the switch

Make sure to install the left-side PCB assembly (5 keys on the thumb cluster) into the left case, and the right-side assembly (3 keys on the thumb cluster) into the right case.

  • start with the top two switches (labeled 1, in red on the picture)
  • continue with the outer four switches (labeled 2, in blue on the picture)
  • continue with the bottom six switches (labeled 3, in green on the picture)
  • finally, install the rest of the switches