Didier Juges wrote: > Well, one thing for sure, in both my units, the chips are not anywhere near > ready to fall off. I need a crow bar to > take them out... > > Same thing with the PWBs themselves, the card edge connectors are extremely > tight, that's one reason I am puzzled by > the problems, there seems to be plenty of contact pressure. > > However, the sockets really look like the cheap type, tin plated, not the > gold plated, machined contacts type.
Oh, Oh! One problem with the cheapy tin plated sockets is they develop tin whiskers that make minuscule little short circuits between the pins. Bump the board, and they come and go. I have solved this problem on some units by blowing high pressure compressed air all around the sockets. Apple used to tell their service technicians to remove the circuit cards, and smack them hard edgewise on one edge. Same for the mother board. The only long term solution is to replace the sockets with something that doesn't have any tin plated sharp edges. -Chuck Harris _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
