Re: How to separate a short in the plane layers between 2 vi
Ramesh,
I might point out that Kender has nothing to lose. He has a worthless board now. He wanted a way to try and fix the problem without drilling out a via, or reordering the board.
The only other choice is the one I suggested, or some variation of it. If he had a precision jeweler's drill press, he could take a 10mil drill carbide bit and drill a series of holes to cut out the short - but I suspect he doesn't have that sort of equipment.
If you're patient, and careful, you can do it with an Exacto Knife. If you screw it up, you're no worse off than when you started - you still have a bad board that you need to redo.
If the via hole is big enough, and only connects top-to-bottom, you can drill out the barrel of the via, thread a piece of wire-wrap wire through the via, and connect the top and bottom by carefully soldering the wire to the top and bottom via annulus. I've also used this technique a couple of times in the past. If the via connects to an inner layer, you obviously can't use this method.
I've been working with circuit boards for many years. After a while, you learn several ways to salvage bad boards.
House_Cat