North: When you face the wall with the door that has the boxes above it, the compass points to the top - that is north.
So the pads that is seen when you face that wall should have the north line.
So you go to the other side and then face that wall with door also and see the cabinet with numbers - the compass should point to top or north. Enter 19 then.
West: When you face the wall with the door that has the boxes above it, turn now to the right. The compass should be pointing right. Enter the number and lines on the pad and cabinet for west.
East - Turn around from west and go to opposite wall.
The compass should point to the left now. Enter the solution for East.
South: Turn the wall with the door you entered in. That is south. Enter the values for south.
To be sure - study the compass and also the pictures in the walkthrough - take note of the cables behind the pads.
Do not forget to turn on the 2 small boxes on east and west wall to show purple color.
Keep us posted and
