Hello! I need some help with my first ever diy mechanical keyboard. I'm trying to build the (first half of a) Sofle Choc v2.1, but sadly I have 7 keys that are not working.

https://preview.redd.it/evs4hk01is9g1.png?width=1695&format=png&auto=webp&s=0d5ca8409e145a2f90e3fa2bb2b1575b1181933d

The keys marked with the tape are not working, the strange thing is that they are not on the same row/column (so the pins on the board sould be OK, is that the case?)

I tried changing switch, switch socket and even diode (for the first row/column key) but that didn't fix it.

https://preview.redd.it/iofsby94ks9g1.png?width=953&format=png&auto=webp&s=408780a317e14ce9ed9dee0651c7761aeca4b90e

Testing the continuity with the multimeter on the two sides of the switch socket will beep only when the key is pressed, so both the switch and the socket should be good.

Testing with the diode function on the multimeter shows .579 when connecting RED ->| BLACK, other way around it - correctly - doesn't show any value

Any guess how could I troubleshoot ? Sorry I'm quite noob at this :)

Thanks in advantage to any of you helping me

PS: Didn't install LEDs, to avoid other problems, will (maybe) install them later when everything else will be working :)