It doesn't power up any more.
I disassembled and re-assembled the whole thing and the result is the same.
Glen, under that shield is power supply unit (switch mode), Digic processor is above it.
Started to look into circuitry, batt voltage is there, I found the location of the FET switch which I earlier suspected to be faulty (based on symptoms).
The small part marked as "P" might be the fuse.. there is no voltage on other side, towards the main board.
According to
this website, it is 3mA.. not quite right! Or 3A? but I am not sure if this is the standard marking for fuses...
It will take a while before I start imaging in Halpha and Mono, it seems..