I now added another 4 caps in total, 2 to RSX, 2 to CPU. Still nothing. It is like the caps weren't even in there. YLOD after 3 seconds max.
The caps are tested and all have their min. of 470 µF, some have about 500. But the caps are rated 470µF +- 10%, so it is ok.
What I found is that the resistance between + and - on the board of this strips for the caps are 1,6 Ohms for the RSX, but about 3,2 Ohms for the CPU. Is this ok?
Should I now remove the NECs on the other side? I only have 4 caps left, unfortunately, I was expecting 20 to be enough