#Keybord doesn't function, is my soldering too bad?
last grove
how much of your keyboard doesn't function?
the soldering isn't the best but I'd expect quite a bit to work looking at that.
mossy marten
show the top too
no way to know if any of your diodes are backwards from this photo
gaunt fox
Oh that's a good point, I think they should be fine but good to have a double check still.
This is me shorting the right half of it (win was an accidental press - that also doesn't work).
rotund kayak
Maybe photo of the soldering on the controllers too
rotund kayak
I would start by cleaning off all the flux residue and visually inspecting all the joints, personally
Then you could start touching up the worst solder joints with fresh flux (and extra solder if needed) and checking along the way
gaunt fox
Okay will do, sounds as a good start. I guess that means there isn't anything obvious that looks wrong?
Is it possible that me soldering have like destroyed the pcb itself somehow?
rotund kayak
Well could be that you aren't making good contact on the solder pads when testing
Sometimes oxide layer builds up a bit
Bad soldering on the microcontroller or shift registers could be causing whole rows to apparently not work
Bad socket for those shift registers could also do the same
gaunt fox
I have no idea what the two bits next to the controller where, now after you comment I looked it up and they are demuxers? So I guess are the thing that makes so that even though if I short two pins directly on the controller I get tons of key inputs by using the keys they are translated into one input instead.
That makes me think they are the reason. Supported by the fact as so many keys are not working and the fact that the few that does always gives me multiple keys
Also don't touch them just in case you forget to unpluck your keyboard, they are very hot... ouch
low tuskBOT
Dasky invoked !promicro
last grove
they shouldn't be hot
gaunt fox
Oh? Well they were like hot hot. Like "want to put my finger in a ice bucket" hot.
rotund kayak
That's a bad sign yes
rotund kayak
One of the pics has silkscreen "lagom v1"
last grove
nibble has the promicro otherwise up
gaunt fox
It is indeed that
rotund kayak
Main pic has promicro face down on the repo
gaunt fox
I have to say that I am not a fan choice, stylistically. But it is what it is
last grove
yeah silkscreen shows it should be face down as well
gaunt fox
Makes sense to do it if you want a flat profile as possible
Guess I will buy a couple of new demultiplexer, maybe they are faulty
last grove
I would try tidy up the soldering a little first
but if those are getting hot, they're very likely toast
gaunt fox
infraRed Thermometer says they climb in temperature while trying keys, just trying a bunch of them made them climb to over 60c
For a while pretty much half they keyboard worked, but eventually it all died
gaunt fox
anyone know if the N in 74HC138N is important lol, found a local seller but theirs says 74HC138 without the N 😅
Edit: The suffix doesn't seem to be important according to google
gaunt fox
Bought a couple of new 74HC138N todays and after swapping them out it all works!