Unconnected wire count changes between restarts of PcbNew

Layout
1

I have a Pcb drawing with 3 unconnected wires. I couldn’t find where they were located. Then I closed PcbNew and re-opened it. There are 2 unconnected wires. I keep closing and reopening, it changes nearly everytime. Here you are: https://aktos.io/cloud/d/44af2bf2c7/

2
  • any footprints with pads that overlap?
  • any chance you can run it in OpenGL and check for ratsnest lines?
  • what does DRC say about it?

3

Sometimes you get rather random connections from via holes to a plane, when there is a through via too close, so your via is marginaly breaking out of the plane

4

Reload netlist works as well.

5

Nope, reloading netlist does not help.

6

So, DRC check should list and point the problematic area. But there was something listed by DRC but none was shown when I double click on them (it directs me somewhere but there was nothing unconnected).

On a second attempt, I selected some checkboxes when re-reading netlist in order not to keep current anything. Now there is no errors shown by “List Unconnected” menu, but there are still 2 unconnected wires exist according to the bottom indicator.

8

Check these pads under the guise of what @Andy_P posted above as I can see tracks going over them in a straight line…

1024×501 444 KB

PS: out of curiosity… how long did you need for that particular layout and how many layouts have you done so far?

9

I checkhed them out by removing their wires and reconnected them. When I removed the wires, “unconnected” count increments. These might not have the problem.

FYI: We have made +30 layouts so far and we need this particular layout badly. We started the manufacturing process despite of the unconnected count if that’s the case, but this particular problem consumes a lot of time whenever we make an edit.

1 Like
10

There is /was a problem with this.
This bug also bites me frequently.

Unclear if it’s gone in later nightlies.