Keys in one column trigger all keys in that row
On the left half of my 6 column corne I suddenly got this problem: When I press any of the keys in the column of pin P0.29 (QAZ) I get the keys left 5 keys of that row. So when I press Q I recieve TAB,Q,W,E and R. I can't see any obvious defect soldering joint and also no short. Does anyone have an idea how to debug this?
1 Reply
That symptom almost always points to a hardware short on that matrix line: the “QAZ” column is getting tied to multiple columns on the same row via a bridged diode, bent switch pin, or a solder bridge at the nice!nano pin.
Try this, in order (power off first):
- Inspect/reflow the nice!nano pad for that column and its neighbors. Look for any tiny solder bridges. Use our Corne pinout to confirm the exact pin: https://docs.typeractive.xyz/build-guides/corne-wireless/troubleshooting
- Check the diodes on that row (TAB/Q/W/E/R). If any diode is shorted (soldered across both pads) or cracked, pressing one key can “fan out” to others. Use diode mode on a multimeter: it should conduct one way only. Reflow/replace any that read 0Ω both directions.
- Pull the three switches in the “QAZ” column and the five switches in that row to the left. Make sure no switch pin is bent and touching the other pad or the socket spring. Verify the hotswap socket springs aren’t mashed flat; gently bend them out if needed.
- Continuity test: with no switches pressed, there should be no continuity between the QAZ column pad and any other column pads on that row. Move along the row to locate where continuity appears—this usually pinpoints the exact diode/switch causing the bridge.
- Clean flux and look for stray solder balls/metal filings around that row/column.
More tips: Rows/Columns Not Working: https://docs.typeractive.xyz/troubleshooting/rows-columns-not-working
If you can, share clear photos of:
- The nice!nano solder joints for that column
- Both sides of the PCB around TAB/Q/W/E/R and the Q/A/Z column
Reply here or tag me and I’ll help you pinpoint it.
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Row(s) or Column(s) Not Working | Typeractive.xyz Documentation
Fix row(s) or column(s) not working on your keyboard.