Hi friends! A single row on left half of my corne stopped working this morning. What should I try?

I observe the same behavior on both wireless and usb (host half connected via usb).

I tried to re-seat the controller, which has helped similar issues in the past. Though, when I have experienced this in the past it has never been an exact horizontal row. Previously a handful of keys from different rows would stop working and reseating the controller would solve this immediately.
I am quite sure this row is mapped as I see those keys in ZMK studio and haven't remapped the keyboard in the last 24 hours. This row functioned correctly last night.

TyperAI•12/10/25, 5:40 PM

Since it’s a full horizontal row on one half, that almost always points to a single row pin / trace issue rather than firmware.

Here’s what I’d try:

**Confirm the exact row**
- Note all keys that don’t work on the left and make sure no others are affected.
- That helps us match it to a specific row pin.
**Find the matching nice!nano pin**
- Go to the Corne Wireless troubleshooting page and open the pinout:
  https://docs.typeractive.xyz/build-guides/corne-wireless/troubleshooting
- Use that plus the general guide here:
  https://docs.typeractive.xyz/troubleshooting/rows-columns-not-working
- Identify which nice!nano pad is responsible for that row.
**Inspect and reflow solder**
- Check that row’s pin:
  - On the nice!nano → header/sockets
  - And on the header/sockets → PCB
- Look for dull/cracked joints or joints that don’t fully wet the pad.
- Reflow with ~270–300 °C, add a tiny bit of fresh solder if needed.
**Check for shorts**
- Inspect that pin and its neighbors under good light. Make sure there’s no solder bridge between pins or to nearby copper.
**If you have a multimeter**
- With the board unpowered, use continuity mode:
  - One probe on the nice!nano row pin.
  - Other probe on a switch pad from that row. You should get continuity.
  - Verify no continuity from that pin to adjacent pins.

If you can, reply/tag me with:

Which keys in that row are dead
A clear photo of the nice!nano area on the left half (both sides)

I can then point you to the exact pin to focus on and help interpret what you find.

Troubleshooting & Pinouts | Typeractive.xyz Documentation

If you're running into issues with your keyboard, check out our Troubleshooting page for common issues and solutions. If you're still having trouble, please reach out to use on Discord!

Row(s) or Column(s) Not Working | Typeractive.xyz Documentation

Fix row(s) or column(s) not working on your keyboard.

bkOP•12/10/25, 5:41 PM

I had never used "host half connected via usb" until last night though so I wonder if it possible that the cable caused some issue

bkOP•12/10/25, 5:41 PM

the second row on the left side doesn't work @TyperAI

Bbk the second row on the left side doesn't work <@1231380511771857097>

TyperAI•12/10/25, 5:42 PM

Using the host half over USB by itself is very unlikely to kill a single row. If a cable somehow caused damage, you’d typically see the whole board or USB side fail, not just one row on one half. So this is almost certainly a row-line hardware issue that just happened to show up now.

Since you’ve confirmed it’s the entire second row on the left and it fails both wirelessly and over USB, the next steps are:

**Double‑check which keys are dead** Make sure *every* key in that horizontal row on the left is dead, and no other keys are affected.
**Find the row’s pin on the nice!nano**
- Open the Corne Wireless pinout here:
  https://docs.typeractive.xyz/build-guides/corne-wireless/troubleshooting
- Use it together with:
  https://docs.typeractive.xyz/troubleshooting/rows-columns-not-working
- Match that physical row to the labeled row pin on the nice!nano.
**Inspect and reflow that pin**
- Power off, remove the left nice!nano if it’s hotswap.
- Check the solder on:
  - The nice!nano → header/sockets
  - The header/sockets → PCB
- Reflow that specific row pin on both sides (and maybe its neighbors) with a small amount of fresh solder.
**(Optional) Continuity test**
- With a multimeter in continuity mode:
  - Probe 1 on the row pin at the nice!nano.
  - Probe 2 on one of the switch pads in that row → you should get continuity.
  - Verify there’s no continuity from that row pin to adjacent pins.

If you can, reply/tag me with:

Which exact keys in that row are dead
Clear photos of the left nice!nano area (both sides)

I can then tell you exactly where to focus and help interpret what you see.

Troubleshooting & Pinouts | Typeractive.xyz Documentation

If you're running into issues with your keyboard, check out our Troubleshooting page for common issues and solutions. If you're still having trouble, please reach out to use on Discord!