Ok guys,
i am on a good way to get a solution for an internal USB-Port. I am quite sure that i found the USB D+ and USB D- pins which will lead to the final goal.
Right now i try to figure out to find a 5VDC source on the mainboard to power the port maybe i have to get this from the micro USB port on the side of the frame.
Stay tuned and press thumbs that I will not melt my beloved device.
I have faith in you. Good luck!