It's more of a lasting fix to replace capacitors; and more satisfying when what you learn to do creates a working collectible, in the 90s, when I collected so many 9 inch B&W Macs, I would
put the motherboards, after removing the RAM and battery, right into the dishwaher and run the Pot Scrubber Cycle. I let the boards dry in a warmed spot for three days and inspected them before reinstalling them. This method staves off a major re-capping temporarily while you see what other parts are no longer working right, (floppy drive/CRT-flyback transformer/Power Board). Sometimes it let my Macs work for years with no other problems. Jeff G ________________________________ From: Tom Frikker <[email protected]> To: [email protected] Sent: Monday, December 2, 2013 11:44 AM Subject: Re: Mac Plus repair and checkerboard screen problem I just tried to start the checkerboard one up after cleaning the ram terminals and straightening the pins... no luck. Same symptoms as before. I know the problem's in the motherboard somewhere, since the symptoms switched when I switched motherboards. I've already cleaned the main board with water and a cotton swab, after dusting with some compressed air. Do you think the board needs to be more thoroughly washed? On Sunday, December 1, 2013 6:31:23 PM UTC-5, Tom Frikker wrote: I recently bought two Mac Pluses off eBay, one beige and one platinum. When I tried to boot them up, they both didn't work, at first. The beige one was booting up to a checkerboard screen, no startup bong, and made a buzzing noise. The platinum one booted up to a screen with horizontal lines, much like the terminal simasimac symptoms on an SE (also no startup bong). To try and narrow down the problem, I swapped the motherboards for the computers, and the symptoms swapped as well, so I knew that the problem was the motherboards. Cleaning the ram and rom chips had no effect. Finally, I swapped the rom chips between the two boards, and the beige mac (the one that had the platinum motherboard with the simasimac problem) started to work perfectly. Great! Now, I went to try and fix the platinum mac (with the checkerboard issue). I realized then that this mac had been upgraded to 4MB and the resistor had been cut. I started playing around with the locations of the ram chips and the amount I put in, but all I got were different shapes of checkerboards on the screen, and still no startup bong. Any ideas? I really want to get this Plus working! -- -- ----- 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. -- -- ----- 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.
