check the power supply voltages, most likely that's the problem. the two "missing" caps were probably just omitted on later boards, apple probably found they weren't really necessary and stopped putting them in. engineers like to put in lots of decoupling caps, usually you can get away with not having all of them.
"Edward J. Cetron" wrote: > > Hmm, > > One of my SE/30's just went belly up - maybe --... When I power it on, the screen >goes to alternating black and white vertical lines over the top half of the screen, >vertical black and white lines offset from the above (black to white, white to black) >for the next 25% and then a sort of wavy herringbone for the last 25% of the screen. >All analog board connections look good, all solder connections solid and shiny. I've >tried 4 different sets (4) of memory to no avail, cleaned and reseated all RAM and >ROM-SIMM and nada. Did notice that the two caps at the very front of the mobo >(location B1 and L1) are both missing. They are in the schematics as "generic pull >up caps" 47micro's at 16V... could these keep the RAM system hosed? or have I blown >something else on the board --- Hate to buy another SE/30 for just the mobo -- or for >just the 2 caps.... guess I'll try Radio Schlock while y'all think of anything else >to try..... --------- -- "Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing." - Helen Keller, American Blind/Deaf Author & Lecturer... -- 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/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
