Re: gEDA-user: How to find which specific part of a PCB is shorted?

[Kai-Martin Knaak <kmk@xxxxxxxxxxxxxxx>]

Thomas Oldbury wrote:

> I am getting these messages:
> 
> Warning! Net "3V3plus" is shorted to net "GND"
> Warning! Net "GND" is shorted to net "3V3plus"
> 
> The 3.3V bus is used all over the board. How can I locate
> specifically which part is shorted?

This is what I do:

1) open the net list window

2) click on one of the offending nets. The right side of the netlist 
window will show all the pads and pins that are connected to this net. 

3) double click a pin or pad. On the canvas, the cursor warps to the 
pin. 

4) move the mouse slightly

5) zoom in 

6) type [f] while te mouse hovers over the pin or pad 

7) follow the highlighted path to see, where it goes off-road.

Step 4 and 5 are really only necessary, if the pin count is fairly 
large.

If the offending connection is to ground, like in your case, and there
is a ground plane, then there may be find color all over the place. So, 
there is no visible path to follow. In that case, I put the polygons 
into their own layers with their own, private layer group. They are not
considered connected anymore

If everything else fails, I resort to plain old bisection: Remove the 
right half of the layout and check, whether the short goes away. Repeat,
until you spot the problem. Then revert to the complete layout.

---<)kaimartin(>---
-- 
Kai-Martin Knaak
Email: kmk@xxxxxxxxxxxxxxx
http://pool.sks-keyservers.net:11371/pks/lookup?search=0x6C0B9F53
increasingly unhappy with moderation of geda-user



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