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Ratline remains even though everything seems to be connected.
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pnewell98 4 years ago
Hi all, I have been working on a hobby project for a few weeks and have come across an issue with my PCB design. I have shared a public copy of my project here  [https://easyeda\.com/editor\#id=\|4591c5c30a5a4b738a02be3cab1c1e29\|e56e6165188d4026b633cd6e4b7c5612\|daa83d8c314d47cfb8478d07f355beed\|bf25bd5218c44e369bb34afce194dbe9](https://easyeda.com/editor#id=|4591c5c30a5a4b738a02be3cab1c1e29|e56e6165188d4026b633cd6e4b7c5612|daa83d8c314d47cfb8478d07f355beed|bf25bd5218c44e369bb34afce194dbe9) ( I think this is the correct link). The issue is that when I run a net check in the design manager it shows that the GND (ground) net has some missing connections and there is a ratline between IC3 pin 7 and another component LED1 cathode. Both the pins are shown as the GND net (which is correct) and as far as I can see both are connected with vias to the ground plane. I have tried removing and recreating the ground connections for both components and routing tracks from the unconnected pins directly to another component ground pin and directly between LED1 and IC3. However, whatever I do, the ratline still remains. I am tempted to ignore the error but would prefer to resolve the issue in case it is a genuine mistake on my part :-( If anyone is able to offer help that would be most kind! Regards Paul.
Comments
andyfierman 4 years ago
Have you checked with the copper areas set to visible and after you have done shift+B to rebuild all areas? Aldo check that you have assigned the correct net name to the ground plane. It is set to GND by default but if you have called your ground net something different or not given it a name or net flag in the schematic then it will not be connected to the plane called GND.
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andyfierman 4 years ago
The problem is that although the copper area below has GND connections to it from pin 56 of U1 and the cathode of LED1 - and so fills and does not appear empty as an unconnected island - it is not connected to a ground net anywhere else because it is pinched off. The clue here is the two ratlines: ![image.png](//image.easyeda.com/pullimage/ggfqmu9fG3xgZ1lzW7e7CmNv2HIM2Imp5Y3Ie1KR.png) You need to either open a channel into it or route a GND track into it directly to connect it to the rest of the GND plane.
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pnewell98 4 years ago
Thanks for your help Andy. I've got it now! For some reason I was thinking it was the IC3 pad that wasn't connected to ground rather than the LED. Hadn't spotted that I had an island around the LEDs. Thanks again, Paul.
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