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Showing results for tags 'simasimac'.
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rplacd posted a topic in Compact MacAll – I'm genuinely flummoxed by this. Have any of y'all seen this happen before? I took a working, recapped SE/30 without a PRAM battery, installed a new PRAM battery off Amazon, and boom – simasimac on boot, no chime, even after waiting for RAM check to complete. Removed the PRAM battery, and I'm stuck with the same simasimac. Would y'all know what might have happened here, or how inserting a PRAM battery in an SE/30 that previously worked might lead to a simasimac? To make sure I hadn't accidentally unseated a ROM or RAM SIMM, I removed all of the SIMMs, soaked them and the logic board in vinegar to get rid of any corrosion, washed it, and dried it. No change. Attached are shots of the top and bottom of the logic board, if that would help. They're a little blurry. (Some IPA is still trying on the top shot, so it looks a little bit wet.)
So, I got a SE/30 for free since it was in pretty bad condition, screen burn in, dead HDD, and horizontal bars and no startup chime, now I've never had to restore a mac like this, my Classic II has never given me any issues (and of which i have removed the clock battery to prevent leakage) So, i quickly learned these horizontal lines are due to leaky capacitors, so i took the computer apart and pulled everything out. The insides of the computer was not good, the battery had leaked a fair bit, even causing rust on the metal frame as well as the positive battery terminal. The parts around the battery seemed fairly fine except the solder on the pads looked a bit weird, but the Y1 Oscillator on the board had been hit the hardest by this and the entire component has white spots and the legs broke off during cleaning, I did repair the legs using the leg trimmings from the capacitors i used for replacing. So I removed all the caps, managed to not lift any traces, while i intended to remove them carefully with heat, they just came off extremly easily. I washed the board with white vinegar, and then proceeded to rins it, I let it dry for two days in front of the space heater which dried it off rapidly. Replacing the capacitors and fixing the Y1 Oscillator, i tried to power the mac back on, but nothing has changed, so i took the rom out, saw some corrosion on the contacs, cleaned with denaturated ethanol and tried again, no dice, cleaned withwhite vinegar and then more ethanol, still nothing. So it seems it's dead, or there's something i've missed, I intend to take off the battery holder entirely tomorrow and check the traces running under it, but if anyone here has any tips on how to revive this old computer, then please do tell.
Alex posted a topic in Compact MacHoping someone can give me some advice. Issue SE/30, no bong, video shows up but the image displayed is that of a static semi random checker board - see attached images About the machine - SE/30 no HD - Removed all old caps, axials and electrolytics and replaced axials with axials and electrolytics with tantalums. - Old caps had virtually no leaking when I received the board which was shipped in an antistatic bag - Condition of board, looks clean but was purchased as untested. I only tested after replacing caps. - Battery did not leak (no battery was included with the board) What I have done. Reseated the ROM. Checked continuity for replaced caps and all pass as far as I can tell. Reworked solder (reflowed) entire section marked in yellow (see image). What I have NOT done. Visually inspected analog board (dong that in a few minutes after discharging CRT) Rework solder (reflow) the Analog board (potentially might help?) Reseat RAM Reseat Socketed Chips (but I don't have a proper tool to remove them) If you have any advice or need photos of the logic board or sections of the logic board please let me know. As I understand it this issue as a whole is know as SimasiMac. SE30_vid_issue.mov
Hi all, I had an SE/30 board recapped by MacCaps. Originally, board was no boot/no audio whatsoever. It has made progress since being cleaned and recapped, audio now works. However, I'm still left with this as a result: The startup chime is messed up, you can hear it in the following Youtube video: https://youtu.be/D_z18h5slp8 What has been done so far is the following: *Tested with three different SE/30 ROMs (2 known good, and 1 from this specific unit) *Tested with several different combinations of RAM. Since in my possession after recapping I have personally tried 5Mb(4inA,1inB), 4Mb(4inA), and 1Mb(1inA), all with the same chime and image as above. *Cleaned board several times *Charles checked ~90 tracks by hand from the schematics, and all look good. *I haven't bothered putting in a new PRAM battery yet, as that shouldn't affect the computer's ability to boot up. Charles is thinking it could potentially be the RAM controller, if I'm understanding correctly. Has anyone run into a similar (or the same issue) as this case? If so, what fixed it for you? I have at my disposal a mediocre soldering iron, some solder, and a very basic digital multimeter. If anyone has simple instructions to follow along, I can probably swap some parts assuming my soldering skills (much like my soldering iron, they are mediocre at best) can keep up. Here are some photos of the logic board: