Hi Chuck, Thanks for the tip. That's got to be the problem. I will take the CPU card out of the worst offender tonight and look under the magnifier.
Didier KO4BB ---- Chuck Harris <[EMAIL PROTECTED]> wrote: > > > 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 time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts