Found the problem with the locked on popbumpers - like I posted at the end of the previous post, the +5v is indeed missing at the boards.
Traced continuity back to the cpu board (A1J6 iirc) so the wiring or connectors are not the problem.
Investigated the trace on the board and found the problem, battery acid ate a small trace right at the bottom corner of ic Z3 (or Z2, don't remember, the right one of the two).
Soldered a small jumper cable over the trace but only got about 2,5 volts.. so decided not to hack the cpu further but first repair all the damage completely. I still have a battery damage repair kit from GPE that I bought years ago.
Double checked all components are present, marked them on the paper sheet, so I know what parts I have to desolder.
Then I'll clean up and check continuity on all traces.
Also found a new problem - the voltages on the power board are much too high :-(
5v was 8, 64v was almost 100, 40v was 68, 8v was 18, ..
Soldered the input on both transformers from the 220v to 240v tap, but that did not change anything.
So I will also rebuild the powerboard.
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