On Tue, Jul 5, 2011 at 7:44 PM, poopoopoopoo <[email protected]> wrote:
> Ok, I've done every reasonably simple fix. That is, removing all the > board connectors, carefully cleaning them. Cleaning the edge > connectors on the SIMMs. I tested voltage at the floppy port as per > the instructions Thomas Lee's excellent Classic Mac Tech Docs 2.0. > Perfectly in spec and stable. 12.09/5.04v where the voltages belong. > If I fire up the Mac, sometimes it will run for hours, sometimes > minutes before it locks up. If I cycle the power after it locks up, I > get a low buzzing sound and the classic 'simasi' Mac pattern. If I > wait for some amount of time she will fire back up. Suggesting an > overheating resistor or bad cap(s)? Is there a common cap (I > understand C1 is a high failure one) or resistor I can replace and be > reasonably confident that might be the problem? > > Thanks again everyone for your help. It definitely helped me to > troubleshoot the screen blacking out/smack on the side issue. Removing > and cleaning the connector on the analog board did the trick. No > problems there anymore. > > Did you actually reflow the solder on the analog board for this connector, or just clean inside it? The #1 problem with the old Pluses, I've found, is their lack of fan creates excessive heat which causes the solder joints, on this connector especially, to crack over time. If you didn't actually reflow the solder on that connector, there's a good chance you're still dealing with symptoms of the same issue. Nat -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
