Massive quest for everything PowerBook 2400c — #7

Post #7 by tomlee59

Source Forum	68kMLA
Category	Troubleshooting
Post Date	Fri, 11 Jul 2008 - 20:40
Original URL	https://68kmla.org/bb/threads/massive-quest-for-everything-powerbook-2400c.13884/

Post

One of mine did the deathbead GLOD thing, where it would work sometimes and then degrade, before finally not cooperating at all. A new power board cured that problem. I figured that it was the power board because I compared voltage readings between good and flaky boards and found noticeable differences, something that a simple PMU reset wouldn't fix.
Now if only someone would come forward with a schematic for the power board, I would be really happy, as I could fix the dead ones I have without having to totally replace them.

If the common failure mode is a gradual descent into non-functionality, then it is somewhat unlikely to be semiconductor-related. Given the high failure rate of electrolytic capacitors, I'd suspect them in the absence of any other information. Instead of waiting for someone to trace out a schematic, I'd just replace all of the electrolytics. There can't be too many of them on the power board. Couldn't hurt, and would probably help.