Hi.
I decided to lube my switches since they did sound awful. However, after resoldering them back, my keyboard did not work as it should. Only the bottom row operates as it should and the rest of the rows do not.
When pressing some key from the upper rows, it spams a bunch of characters and commands from the row in which the key is. For example, when I press "a" input is "asdä+'" or similar.
Here
https://imgur.com/a/VKZhHKb is a video from the key tester. At first, the functioning bottom row and the starting from bottom enter things get wild. After a while keys work properly again as you can see.
The keyboard is Keychron K4 V2. (I have read that pcb solution may be a bit weird?)
Any ideas on how to locate the problem? There is not any visible flaws.
I have tried some tricks with a multimeter, but honestly, I do not have any idea what I am testing.
