usb port flex cable is damaged, anyone has schematic diagram for it?

I was DIY-ing touchscreen + LCD replacement, all is good, the replacement screen works well but I accidentally damaged the flex cable for the usb port ( so fragile :( ). it is only a matter of soldering it back to the port, but some part of the flex cannot be traced back to where it was soldered before. I need schematic diagram of the flex. anyone has? or maybe it is a common arrangement? any help would be appreciated.