Well, this didn't go as simply as I had hoped.

In an attempt to upgrade the memory on a Macintosh 128k I received in 2012 from a now-late relative,
I seem to have borked the system, which turns on not with the familiar bell bong, but a harsh staticky noise,
and an almost completely broken screen at first (So badly I can't even read the error code).:

It's now gotten worse, when I tested it last night, with a completely static-laden screen.

To do this, I used this article (There's a PDF somewhere on the page)...:
https://macgui.com/news/article.php?t=466

...along with a heat gun (I was careful) to preserve the Apple-branded memory. I didn't see any delamination bumps, so I'm assuming the logic board itself was not affected.

I did check certain attributes to make sure they were working properly, and did some replacements:

• There is continuity between all respective pins on the memory.
• I checked to make sure the data lines were connected to the CPU. (And they are, plus the system actually starts up, so I'm assuming that the CPU is executing code)
• Replaced the 253 Demuxers (just in case there was a problem with the memory select), also replaced more logic chips.
• Replaced all capacitors on the analog/power board.

Unfortunately, none of the symptoms match any problems in "The Dead Mac Scrolls". I even adjusted the voltage on the analog board. (It did nothing to fix the problem)

At this point, I'm not sure what is wrong.