After you complete the hand-mounted parts on your board, finally you'll connect the wall power adaptor plug to your board. The board will work. But you'd better check the power rail voltages first if you need something to rework.

Supply Voltage Check Points

Step1

Turn off the SW2 and SW3.

Step2

Connect the wall DC-power adaptor to your board.

Step3

Turn on the SW2
(You'll see the red-LED turns, and it changes to blue few seconds later)

Step4

Measure the test-point #1 through #5 referenced to GND voltages with a Multimeter.
If the heat dispassion of U7 is insufficient, The Test Point #5 voltage will be runaway exceeds. (So I recommended using a lower voltage power supply)

Step5 (Raspberry-pi User Only)

Turn on the SW3. Power up the +5V for Raspberry-pi.
(You will see the LED color change to Green)

Step6 (Raspberry-pi User Only)

Measure test point #5 with a Multimeter.
If your power supply capacity is not enough for driving Raspnerry-pi, Test-point #5 voltage will drop. I recommend using the 3A or more capable power supply if you face this kind of trouble.