i’ve seen a few defective apple ibooks recently … and had to solder one last week: there’s a little chip with 28 pins on the bottom of the logic board, the quality of the solder-job was so bad or the heat so intense that one pin (#28) came loose
instead of putting shims between the case and the chip i would recommend soldering: the shim pushes the chip onto the logicboard but not the pins – unless you make a shim with a hollow center …
anyways you need a steady hand, a good magifying glass but no extra solder! just let things flow a bit, takes only a sec or two per pin, but it’s a tedious job cause everything is so small!
some pics etc at www.coreyarnold.org
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gotta be somewhere …
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most interesting websites i found about this topic
http://www.schneier.com
from Bruce Schneier, genius, author of “applied cryptography”, my most beloved book
http://www.scramdisk.clara.net/pgpfaq.html
older info (1999?) from Sam Simpson, very smart guy