It’s very hard to diagnose from these photos, but one question I have is if D, F and space have anything in common? Are they on the same wiring row? Or maybe they all have different rows/columns? Are they all on the same hand? Are the other keys nonresponsive entirely?

Starting with why those three are working might point you to a solution.

Also perhaps look at the diodes - are those three diodes oriented differently to the rest of the diodes? I can’t see all the diodes because some are hidden behind wires.

Also without knowing exactly how it’s supposed to be wired it’s hard to understand what it’s meant to look like. What wiring diagram are you going by?

It looks like you’ve got on the first picture white, orange, red, yellow for the rows, and green white black blue green purple for the columns. There are other wires I can’t locate, but it doesn’t on the surface look wrong. You could check each connection with a multimeter to ensure there aren’t any breaks. If you want to check with the diodes in place make sure you test them in both polarities because multimeters use a polarised charge to check for continuity/resistance. Testing them in one direction should give a high resistance and in the other should give a low resistance.

It’s also possible you have a problem with the chip itself. If you have a spare that you can swap out that could be worth trying. I usually have spares because they’re quite cheap.