The powerbook 170 can develop what is called tunnel vision… it happens because the LCD has been contaminated with moisture, due to a failure in the Sealant used for the LCD, its a common flaw with the 170. also watch out with the plastics, they are really brittle.

There are some things you can do that can help your tunnel vision. for instance one suggestion was to place the screen into a 5 gallon bucket filled with rice for 3 or 4 weeks.

The other suggestion that i followed was to bake the LCD panel screen its self in the oven at 215 degrees for a couple hours.

I only baked mine for 30 min. I would like to say it made about a 50% difference, the only down side is a few dead pixels now appeared. maybe that was because i needed to bake it longer. dunno.

I had picked up a powerbook 140 from an electrical engineer in canton, mi. He told me he took apart the power brick and fixed something with it but never said what.

I wold assume the Radial Caps in there would start to leak at one point.