I'm the president of a Mac Consulting/Repair company and have pulled my hair out over the increasing prices of used sound boards for the G3 Powerbooks. They all suffer the same weakness: The soldered-in-place ac adapter jack. Solder is not meant as glue or as weld; it is to reliably join electrical connections--that's it. So, what happens when you order a used board (or even worse, a new one from Apple) is that you get a board that has the same problem as the original and has not broken yet. Add to that that the more they break, the higher the market value/demand. These boards have almost doubled in price in the last year! How do you tell a client that an part for an older computer is getting MORE expensive, especially when he just had one installed 6 months ago!!!
Well, I had had it and decided to do something about it.:( I ordered a "tested and working" used one from a vendor in the midwest and it showed up DEAD with a very amateur attempt at repair. This gave me an idea! DING!
I found a way to reinforce these things and resolder them in a way that is both reliable and consistent. I am working on getting a photo pdf to circulate and will post it here. If anyone is in a bind, I can tell them how to do it in detail in the mean time!