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What causes unreliable keypress? [DIY keyboards are like gambling]

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vatin:
I build myself a Corne keyboard with hotswap support as per the build instruction.
But one switch produce unreliable keypresses. Sometimes it act normally, sometimes I need to mash real hard for it to produce a key, sometimes it register double keypresses either from mashing or even light touch.
If I replace with new keyswitch, that switch will be dead for a day or two. I need to disconnect and leave it, then it will come back but works unreliable still.
What is causing this. I'm getting so tired. I want stuff to work. I don't want typos..... This is not a cheap 2 dollars keyboard. This is ergo split keyboard that suppose to save my career. Not causing more frustration.

[Update] I tried reflow and add some more soldier to the problematic hot swap socket. It worked fine for a while. And now it's dead. No amount of mashing will produce a keypress. And I don't want to replace the hot swap socket since I don't know how to desolder. And even if I do, it is a risk overheating and melting the solder pad altogether. The only place this keyboard belongs is the trash.

pixelpusher:
Sounds like this to me:

https://docs.cannonkeys.com/troubleshooting/#cause-3-the-leafleaves-within-the-hotswap-socket-are-not-making-proper-contact-with-the-switch-within-the-socket

vatin:
Sometimes when I mashed the affected button, it produces not double, but 3 characters in a row. Let's see if I could make it 4 or more. Let's set some record with this baby, so every working day is a challenge. I also need to put some kind of meter under it to measure the force required to make it register.

thocciness:
It sounds like the the switch isn't making a complete circuit so from my experience it could be a loose Hotswap pin.

vatin:
[Update] I tried reflow and add some more soldier to the problematic hot swap socket. It worked fine for a while. And now it's dead. No amount of mashing will produce a keypress. And I don't want to replace the hot swap socket since I don't know how to desolder. And even if I do, it is a risk overheating and melting the solder pad altogether. The only place this keyboard belongs is the trash.

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