This is NOT a schematic of the board. This one I already found for free on the internet, although the best I have found yet, and combined with the , also free, board view of the board made a good starting point. I need to dig deeper and sadly thought that this also included a full schematic. Especially since it is promoted by a staff member as a "Repair Guide Schematic" I assumed it would also at least contain the actual "Schematic".
But it don't. I know this is an old board and I thought i't would be easy to get information about it but it turns out it is not. In my case all seems good past this 'Guide' but the CPU_LED still stays on. Obvious next step would be to test with another, known good, CPU but I don't have access to one in the near future. I don't do this for a living, I do this is a hobby. And I don't think the CPU just died from one day to another without any previous symptoms.