Printed circuit mother board and printed circuit board assembly

The invention discloses a printed circuit mother board and a printed circuit board assembling assembly. The printed circuit mother board comprises: a first field effect transistor; a second field effect transistor, wherein the grid electrode of the second field effect transistor is connected to the drain electrode of the first field effect transistor in series; a mother board connector which is arranged on the mother board and is connected to the grid electrode of the first field effect transistor; a light emitting diode, wherein the negative electrode of the light emitting diode is connected to the drain electrode of the second field effect transistor; and divider resistors, wherein one end of each divider resistor is connected to the grid electrode of the first field effect transistor, the drain electrode of the first field effect transistor and the positive electrode of the light emitting diode, and the other end of each divider resistor is connected to a positive voltage source. Whether the printed circui