I know that I somehow damaged my board, but somehow it is also still alive.
Power over outputs or 3DR power module does not work anymore, but if I supply +5V to my soldered UART0 pins and to one input channel the board comes to live and everything works fine. Even the still connected 3DR power module gives good readings concerning ampere and voltage. As soon as I disconnect power from one of the 2 active supplies the board stops responding.
Any clue where to start measuring to identify the damaged parts?