Well, I have picked up this Macintosh SE/30 today. Seller said it wasn't working, he turned it on and it was just Death Chime looping. I picked it up for €55, to accompany my other SE/30. At home, I pulled it apart, finding out that it is in fact not a video card of any kind, but a "h-three Systems Corporation" card with a whole bunch of TI chips. Looking at datasheets of said TI chips, this appears to be a Token Ring NIC. I wonder if this can be adapted to a modern Ethernet network.
As for the SE/30 itself, I pulled four 2-chip Texas Instruments RAM SIMMs of unknown capacity out, leaving four 1MB SIMMs with Motorola chips in, it will chime now, but no video. I noticed some corrosion on the edge connector (or whatever it is, it looks like that) under the ROM SIMM, although it hasn't spread, so it should be easy to clean off. A few traces have brown crud on them, a few near the tiny audio capacitor, and a few near C13. C13 also cleanly fell off while handling the boards, leaving the pads intact thankfully. I'm going to assume these capacitors are just truly toast. Maybe UE8 is bad on this one as well, but I've managed to fix that on my other SE/30, so not too worried about that. At least the battery didn't leak at all! Time to order some caps I think