>Date: Sun, 8 Dec 2002 14:50:43 -0500 >From: Bill Brown <[EMAIL PROTECTED]>
>I received three spare Classic II motherboards. I noticed a >peculiar staining on each of these boards. In each case, it looked >like a couple of splotches of Dr. Pepper or something sticky >frequently spilled by Macheads. >After the cleaning, I cleaned 'em again. >The one that doesn't work at all doesn't work at all. >The one that works less than perfect is interesting. > >There is not much you can do on a Classic II motherboard. I will >clean and test it again. Whatever > on this bad board that does the RAM arbitrating has likely stopped. >This board is likely headed to > the dumpster to fulfill the "discard" instruction of its container. This was an issue for IIci motherboards starting about seven years ago. The goo which leaks from the capacitors is corrosive. After cleaning, hunt around for eroded/cut traces on the circuit board. Also, solder joints where the chips or other components are soldered down may have been eaten away. On my IIci there was a solder filled via (little copper lined hole which connects trace on front of board with trace on back of board) which the goo had eaten away so that it was no longer connecting its two traces. Bypassing the corroded conductors with a bit of wire will usually do the trick. This may require some meticulous examination and the use of an ohmmeter on your good board. I found it was easiest to figure out the end points of the corroded traces and to attach the wires there (where there were already solder joints) rather than trying to expose enough trace to solder a wire to. Jeff Walther -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.shtml> The FAQ: <http://macfaq.org/> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
