Sounds to me like you are having fun. Swappin parts, enjoying the hobby. Enjoyin your self indeed. - that is what its really about right?
Jeff is right on the money. Just to add to that, (for the one that is not working) Get out your meter and check Your voltages 5/12 vdc +/- make sure those are all up to snuff. If not then you know it's an A/B issue. I went back your your first post. "no startup bong, and made a buzzing noise. " So i am assuming its not doing this any more? The first thing i always do is take the machine out to the garage and blast the whole thing out with the air compressor. Next inspect the main board.. If its dirty i wash it… after a good wash with warm soap water and a tooth brush. then i take it to the compressor again, and blast all the water off, If i'm still concerned about moisture in it, I will bake the board at 175f in the oven for 20 min. 128k/512k/512ke/PLUS/SE Caps are really not really an issue with these mainboards, Although, I have seen a few times those 33uf 16v caps slightly dribble on rare occasion in a SE. However caps on the AB boards, for those machines (128k/512k/512ke/PLUS/SE) Yeah!! if you see any that have leaked or are domed at the top, They are bad and need to be replaced. Sometimes the dome is ever so slight. Also, the one that is not working that still has the checker board, There could be other issues with it, it could just be a bad mobo. Check the bottom, and look to see if any of the pins are bend over or touching as well. Sometimes in rare situations, with poor handling or shipping, through hole parts, the portion through the bottom, could be bent over in such a way they can touch. I had this happen to a SE board once, Many of the PDS pins were bent/smooched over and touching. On Mon, Dec 2, 2013 at 12:45 PM, Jeff Walther <[email protected]> wrote: > > > On Monday, December 2, 2013 10:05:37 AM UTC-6, Tom Frikker wrote: >> >> I looked at the motherboard, and I can see all the capacitors marked with >> a c. Do only the larger ones need replacing, or do even the tiny ones need >> to be replaced? >> > > While most Macintosh logic boards from the previous millennium do need > their electrolytic capacitors replaced, the Macintosh Plus and earlier are > a bit of an exception. Boards later than the Plus (and SE?) bear an > abundance of surface mount electrolytic caps (little metal cans that look > like tiny fuel storage tanks). The Plus logic board does not. > > So, I doubt that replacing capacitors on the Macintosh Plus logic board > will fix your problem. Still, there are five axial (leads come out the > long axis) electrolytic capacitors which you could replace. You can > obtain replacements at digikey.com or mouser.com or similar electronics > supplier. > > The tiny surface mount ceramic caps do not need to be replaced. > > I would first try cleaning the SIMM sockets. Take a piece of card stock > (e.g. 3" X 5" card). Fold it. Apply rubbing alcohol (preferably 91% or > higher) to the fold of the card. Gently rub the folded edge of the card > through the SIMM socket to clean the contacts. Do not use alcohol with > colors (e.g. no green), moisturizers or scents added. > > Also, check your symptoms in Larry Pina's "Dead Mac Scrolls". It's out > of print, but copies are sometimes affordable. If I had my copy handy, > I'd look it up. > > Jeff Walther > > -- > -- > ----- > 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/ > --- > You received this message because you are subscribed to the Google Groups > "Vintage Macs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- Charles -- -- ----- 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/ --- You received this message because you are subscribed to the Google Groups "Vintage Macs" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
