Console repaired, all functions restored!

The problem was the Sega CD-BIOS not initialising. Basically waiting for Sega CD-components to report back, which they did not do. Hence a startup-screen but no animation playing, hence a black screen after each reset.

The problem was a corroded pin on the 315-5632, which is one of the two Sega CD's ics. These are located on the lower side of the upper pcb.



Most certainly no connection here.



It's not the greatest paint job, but it did the job.