Start with your laptop off with the case & hinge open

Turn on the laptop. After this point be very careful not to touch the board especially with anything conductive.

Once your Mac has booted, carefully navigate the OS to play a long audio track that will keep playing for the remainder of this guide.

If you experience the issue this guide is intended for, no sound will play but a red light will turn on in the headphone port.

This silent audio will be used to find the source of the problem later on.