mbaran said:

got it.

Does the full size PowerBook have the same dual film membrane keyboard? My contacts are all corroded and typing is almost impossible on it. Strange design...

Click to expand...

Retrace the lines with a bit of conductive paint to fix it. I ruined a 230 board cleaning it with acetone, but was able to fix it with the conductive paint.

Look here for an example: http://www.radioshack.com/bare-conductive-pen/2760267.html

I've seen this design on many keyboards, including full sized PC Keyboards. It keeps the prices down in manufacture and very simple to make.