Keys registering extra key presses

[Garth ClardyMember]

Hi, I posted this in the thread “weird key press behavior” but it was different enough that i thought I’d create a second thread, so I apologize for the double posting.

I finished building my b.face a couple days ago and my “0” key registers as “*-0”, “p” registers as “Page Up P”, “;” registers as “+;”, and “/” as “Page Down /”.

As you recommend in the other thread, I tried re-uploading the correct firmware and this didn’t fix the problem. Any idea what could have gone wrong?

Thank you for your time

[flashteker@gmail.comMember]

Hi

I think you soldered some switches badly.

Could you show me your PCB which shows soldering parts.

Thanks.

Hojin.yi

[Garth ClardyMember]

Absolutely! Attached is a picture of the section of PCB that is affected. I used holtites on my build instead of soldering the switches, so I don’t know how that would change things.

[Garth ClardyMember]

<p style=”text-align: left;”>Lets try a lower resolution picture of it</p>

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[flashteker@gmail.comMember]

Sorry for bothering you.

I need a photo around main controller parts.

Thanks.
Hojin.yi

[Garth ClardyMember]

This is probably not my best soldering work, so I wouldn’t be surprised if something doesn’t look right

[Garth ClardyMember]

Let’s try that one more time

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[flashteker@gmail.comMember]

Hi

I suspect there would be some shorts in MCU pads(legs).

Could you try to clean the MCU pads?

Or

If you tell me all the keys which register wrongly after uploading a default keymap,
I could pick which pads are bad.

Thanks.
Hojin.Yi

[Garth ClardyMember]

The keys that register incorrectly are “0”, “P”, “;”, and “/”.

[Garth ClardyMember]

While trying to clean up my soldering on the MCU, I managed to strip the finish off of the PCB between two of the pins, making it even harder to make a clean solder point. Have I ruined my PCB while trying to fix this?

[flashteker@gmail.comMember]

Could you show me that parts?

[Garth ClardyMember]

I’m away from my workbench right now, but I will take a picture of it as soon as possible.

Which leads would cause the keys I mentioned to be problematic?

[Garth ClardyMember]

I’m not sure how, but I seem to have managed to fix the “P” and “/” keys. However, the “zero” and “;” keys are still registering extra key presses

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[flashteker@gmail.comMember]

I can’t tell exactly what made that problem.

But I suppose

– The soldering pins in the circle of the photo I attached would have been damaged or had flow shorts.

– Your MCU itself could’ve been broken due to too much heating.

Sorry for not being a big help.

Thanks.
Hojin.Yi

• This reply was modified 7 years, 7 months ago by  flashteker@gmail.com.

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[Garth ClardyMember]

In the event that the MCU is damaged, would I be able to purchase a replacement from a local store? Or would it be something that only you can provide?

It’s reaching the point where I’m tempted to just purchase an SMT replacement and be done with it.

Thanks for your help, I know I’m not making it easy

[Garth ClardyMember]

Using trial and error, I’ve managed to cobble things together into working order.

Thanks again for your assistance

[Author]

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