The CRTs themselves are interchangeable among the compact Macs, but the analog boards are a different story. The SE/30 shares an analog board with the SE, and only the SE, unfortunately.

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Ok, thanks.

If, after washing, you did not allow the board to dry very thoroughly, all kinds of problems can result.

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I first dried it a dozen of minutes with a hairdriyer, then let it dry by itself four full days. I bet it's ok on that side…

Aside from that, reseat socketed components and connectors, check RAM, etc. If those standard simple things still yield no joy, then you are indeed limited in what else you can do, given that you don't want to solder. However, if you are so inclined, you can quickly teach yourself to solder. There are many online YouTube videos, to say nothing of written descriptions. After a little practice on some junk circuit boards, you'll be ready to re-cap your SE/30.

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By "reseating socketed components", do you mean anything else than the Ram- and Rom- Simms?

By the way I'm sure I could teach myself a lot of things, including soldering. Maybe someday! I fear I'm a bit too lazy for now (shame on me), and not self-confident enough to dare. But I'm working on that.

Thanks a lot for your answer anyway!