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There are a couple of different versions with different quantities of electrolytic capacitors of the motherboard. Can you take pictures of the motherboard? (Particularly the right side --that's where the power on/off logic is located)

Thank you. I'll look.

Here is what I’ve learned. Unless noted otherwise, all of this information is based on System 6.0.0 and Inside Macintosh Operating System Utilities. It may have changed in later systems, particularly when PowerPC came along. LongDate2Secs (aka LongDateToSeconds) and LongSecs2Date (aka...

I've been researching the Apple system routines that use LongDateTime as part of a potential solution to the 2040 problem. Because it is first documented in Inside Macintosh Vol VI, I assumed that those routines first appeared in System 7. But, on closer inspection and with some testing, those...

Does your screen also show part of the floppy disk? If so, good news! That means the CPU, ROM, and main RAM are working. Here is a tutorial for fixing it: https://68kmla.org/bb/index.php?threads/example-se-30-video-repair-ue8-ls166.49689/

You bet! I'm glad to hear you got it working.

These are awesome! @redphantom

Hey @jcs I have a Macintosh Portable M5126 with exactly same problem. I mean, exactly the same problem. I thought you'd like to know how I solved it. 1. Swapped the internal hard drive for a ZuluSCSI compact (with .ini set to MacPlus mode and Androda adapter) with a known working system...

Here are three threads that will step you though SE/30 video repair: https://tinkerdifferent.com/threads/macintosh-se-30-vertical-horizontal-bars-on-display-simasima-repair-guide.4705/ https://tinkerdifferent.com/threads/se-30-simasima-repair-6-faults-fixed-and-a-working-mac.4823/#post-41997...

I've experienced this exact problem. Thank you for posting the solution!

Glad you figured it out and posted the solution. We all have been there.

That is really cool!

Hi @superjer2000, My actual quote was a little more general: "When the computer is turned on, the clock is kept in a low memory global which is advanced by the interrupt timer." Depending on the Mac hardware, that interrupt timer may be generated by a number of different sources. The Mac...

Yes -- check the traces. Do you have an oscilloscope? If not, the handheld ones are reasonably inexpensive: https://amzn.to/4oLPdJb

When the computer is turned on, the clock is kept in a low memory global which is advanced by the interrupt timer. Then, it is written back to the clock chip at shutdown.

Assuming the battery is good, then I suspect the crystal. That is Y1 right next to the RTC (real-time clock)

I am so glad this works for you. Definitely makes it worth the hack. Yup. I always go to the trouble of checking return values and nil pointers. Thank you for appreciating my work. : ) - David

Can you be more specific? I've seen this happen on a couple of Macintosh IIsi computers that I ultrasonically cleaned. The root cause was the crystal was damaged. However, it was cheap and easy to replace.

Amazing!

I wrote up the technical details over here: https://tinkerdifferent.com/threads/patching-68k-software-simpletext.4793/