Need help fixing a keyboard

[vektor37]

The keyboard is a Massdrop Infinity 60% from the first drop. A couple of days ago a few key just stopped working altogether. I think there are about 4 keys that aren't working in total: spacebar, 4, u, and m. I tried re-flashing the firmware to no avail. So I next thought it could be some bad/faulty switches, so I tried to replace two of them, but no dice. Any ideas or help would be great thanks.

[suicidal_orange]

Those are some random keys to die, usually they go in row/column groups - if you can confirm all the switches which aren't working it may be more obvious what the problem is.

Also you can try shorting the leg of the switch that's not attached to the diode to the side of the diode furthest from the switch to simulate a keypress using anything conductive - if this works it's a problem with the switch or diode, if not it's a break in the switch matrix.

[vektor37]

Yeah I know. I don't have the board here with me at the moment, but I am 99% sure that these are the only keys experiencing the issues. I'm kind of a newb when it comes to dealing with the circuits, How do I know which diode is furthest from the switch? Does it have to be in the same row or column of the matrix?

Yeah I know. I don't have the board here with me at the moment, but I am 99% sure that these are the only keys experiencing the issues. I'm kind of a newb when it comes to dealing with the circuits, How do I know which diode is furthest from the switch? Does it have to be in the same row or column of the matrix?

[suicidal_orange]

The diode has two ends - one is connected to the switch, you want to connect the other end to the other pin on the switch.  It's not the easiest thing to write about )

[vektor37]

Ok yeah I think that makes enough sense I can give it a try later today and see what happens. Thanks for the help!

[vektor37]

The diode has two ends - one is connected to the switch, you want to connect the other end to the other pin on the switch.  It's not the easiest thing to write about )

Ok so I'm back with just a little more information. I confirmed that the following keys are not registering: 4, \, s, ', m, space. I was trying to picture what you meant by in the quoted section and this picture is what I understood. This is me testing the connecting the two points you specified. The result was that the most of the bottom row activated (maybe all of it? I was using EK switch hitter and some of the keys are flashed to activate the several function layers so they do not register on the program. Assuming that I did what you asked correctly and the switch was replaced with a newly soldered replacement; is it safe to assume that the diodes are the issue?

[vektor37]

Ok so after some more testing I really think this is an issue with a column. I was playing around by adding a jumper wire to a different switch in the row above and the result was that all the malfunctioning keys now worked, but they registered the wrong key. For example 4 was 3, u was y, etc. If I try to jump from one bad key the next, then none of the switches work again. Any thoughts or advice on what I could do next?