Common Mechanical Keyboard PCB Problems And How To Fix Them

Common Mechanical Keyboard PCB Problems And How To Fix Them

Circuit Board or PCB on a mechanical keyboard is a collection of electronic components that are useful for receiving input and converting it into information that will be inputted to the computer. As a man-made device, PCBs also often experience problems or damage to certain functions.

What most often happens is that some of the buttons on the PCB cannot function or are not detected, the RGB lights are off, the PCB is not read or registered on the computer, or even the PCB does not work suddenly and all functions cannot work. In this article, we will discuss some of the most common problems with mechanical keyboard PCBs and how to fix them.

The following are common problems with mechanical keyboard PCBs and how to fix them:

  • Some keys on PCB Not working
  • Broken RGB on PCB

1. Some keys on PCB Not working

In general, before assembling a mechanical keyboard PCB with other components, all we have to do is test all the PCB buttons using tweezers to make sure all the keys can work properly and are detected by our computer. But in some cases, there are some PCBs that are read by the computer but when tested there are some buttons that don’t work or can’t provide input to the computer.

Solving Mechanical Keyboard Keys Not Working Partially:

1. Clean the dust or spill that sticks to the PCB.

PCB is an electronic board whose components are connected to each other through small electrical paths. If there are some buttons that don’t work on the PCB, this could be because the PCB is dirty or something is stuck to the component parts that conduct electricity throughout the board. Dust and small particles made of rubber or cloth can trigger this problem.

Try cleaning your PCB from dust and small particles that stick to the bottom of the PCB where the electrical circuits are connected. You can use a brush or use a blower.

2. Connect the Button that works well with the button that doesn’t work using a cable

If there are some buttons that don’t work on the PCB, it’s because of the power supply that isn’t found on those buttons. You can do this by building a bridge using a cable from the button that works to the button that doesn’t work. The trick is:

  • Find the nearest button with the button that doesn’t work
  • Connect the cable between the two buttons via the switch pin by soldering it
  • Connect the wires on the switch pins that are still working to the switch pins that don’t work.

This method is the best solution to supply power to a malfunctioning button using a soldered cable on the switch pin that is still working to the switch pin that is not working. Solder the wires on the normal switch pin holes and solder on the switch pin holes that don’t work so that the buttons that don’t work will get an electric supply.

By borrowing the path of the button that is still working to the button that is not working using a cable is called the Jumper Method. You must solder the wires at both points of the path.

Found the same power line on the button that didn’t work with the one that still worked. Usually they are on the same line. For example, the space bar and the Right Alt and Left Alt keys, they are connected in a straight line.

Or for example the ESC key with F1 to F12 can be said to be one line, because they are in a straight line. Do this on the PCB button that doesn’t work by finding the path inline with it.

3. Solder the Jumper Cable From the Point of the Button That Is Still Working To the damaged button by soldering the cable

Connect the broken line by supplying electricity from the live line using a cable. Solder the cable right on the incoming switch on the Hot Swappable PCB or on the Switch Pin that has been soldered on the Standard PCB.

In the picture above I did a jumper by taking the power from the control button and connecting it with the Start, Alt, and Space buttons.

For each point, use one cable, do not use the same cable to all points, because it will make the power supply unbalanced. Use the parallel splicing method from one new point to another.

2. Broken RGB on PCB

The thing that often happens to the mechanical keyboard PCB is damage to the RGB or part of the RGB suddenly turns off. This is also caused by the supply of electricity that does not flow normally or is interrupted on the PCB board. This can be caused by dust or the PCB has been exposed to water so that the electrical path that leads to the RGB is damaged or disconnected.

How to Fix broken RGB on PCB Mechanical keyboard

The following is how to fix RGB on a mechanical keyboard PCB:

1. Find RGB Controller

The RGB controller is a component that is soldered on the PCB board, if there are only a few RGB that are off, this may be because the RGB controller solder is detached from the PCB or loose.

2. Fix the loose RGB Controller Soldering by adding a little solder.

Add a little solder to the RGB controller to reattach it to the PCB board so that the dead RGB can work again, this is quite difficult to do but you can still do it with care. Do not let the solder get on other parts because it will cause a short circuit. We recommend you to watch this video in order to repair your damaged RGB Keyboard.


The damage that we have described above is damage to the mechanical keyboard PCB that often occurs. To fix it you must have special skills to find certain points. If you do not have the ability to solder or add jumpers to the PCB we advise you against it.

We highly recommend that you take your PCB to the nearest mechanical keyboard repair expert, besides being safer you also won’t permanently damage your keyboard’s mechanical PCB, because this is quite difficult for ordinary people to do. Leave it to the pros, and it’s not that expensive either, maybe around $3 to $5 depending on the extent of the damage.

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