In most cases, when a camera is not working after turned on, there is a blown fuse on the DC board. You change it (Canon uses – as I know – oly two types of fuses, the K and the P), You turn it on , and that’s it.
This time I measured the fuse in the 5d – interrupted. I changed it. No sign of life. I measured, interrupted. I changed it again – nothing.
After the third change and assembling I realized, that the fuse made exactly, what he is pretended to do: protects the camera in case of a shortcircuit.The DC-board had a resistance of 2 ohms between the plus and the GND…..
So, next time before the fuse change – I have to measure the board.
If I don’t forget to read my own blog.