Try adjusting the 5v cutoff on the ab On Thu, May 24, 2018, 12:19 AM TransportLayer < vintagem...@transportlayer.org> wrote:
> This is a Macintosh I've spent a long time on, and it has just suddenly > died. I'm very saddened by this, and am hoping to get help figuring out > what's wrong and how to fix it. > > Around a month ago, I replaced every component listed in this spreadsheet: > ( > https://docs.google.com/spreadsheets/d/132RwzC8HM5ask-BdY_31txErOCwJDSkz099GY2XLpE0/edit?usp=sharing). > Other than still needing some display size adjustments, it seemed to be > working fantastically -- I had even bought 4MB of RAM for it, installed a > ROM-inator (https://www.bigmessowires.com/mac-rom-inator/), and two small > fans. Yesterday, I booted off of a Central Point Emergency/DiskFix disk, > and noticed the ROM-inator startup image appear while the Finder was > loading. I thought that was strange, and hit "R" to see if it was really > loaded or not. It seemed to just continue booting, however, DiskFix showed > my ROM disk, which shouldn't have been there unless I booted from the ROM > instead. I went into the settings menu for DiskFix, and the moment I > pressed the OK button to save my changes, the screen went off. I'm unsure > if this is related to the issue or not, but because of how it happened, I'm > not convinced it was just a coincidence. > > Now, the Macintosh just makes the little short high-pitched noise it makes > when first powering on the CRT, immediately followed by the disk drive > making a little noise, and then repeating, over and over (CRT, disk, CRT, > disk, etc.), at about 2 cycles per second (so one "CRT, disk, CRT, disk" > every second). There is no startup sound, and the display never comes on. I > removed my custom ROMs, re-flashed and verified them, and put them back in, > but the Macintosh has the same issue. I checked the cables, and there is > continuity between the analogue and logic board's connectors. I removed my > custom ROMs and put the original ROMs back in, and there is still no > difference. I unplugged the internal floppy drive, and could not hear the > CRT come on anymore, but I could hear the speaker turn on (no audio, just > the little clicking noise of power being applied) and my fans turn on, so I > know there was still power. > > I replaced the logic board with one that I know works, and there was a > startup bong, and blinking question mark disk. I inserted a known good > disk, there was a Happy Mac, followed by the screen going off. The Mac now > briefly makes a very quiet sound when switching it on, but it is otherwise > completely dead. > > I would appreciate any help I can get in trying to rescue my poor little > Mac. I've spent so long with it, and I'm very sad that it's no longer > working. I'm very worried I may have killed two logic boards now as well. > > Please let me know if you need any additional details, and I will do my > best to provide them. > > Thank you for your time, > TransportLayer > > -- > -- > ----- > 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 vintage-macs@googlegroups.com > To leave this group, send email to > vintage-macs+unsubscr...@googlegroups.com > 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 vintage-macs+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- -- ----- 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 vintage-macs@googlegroups.com To leave this group, send email to vintage-macs+unsubscr...@googlegroups.com 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 vintage-macs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
