The keyboard cable is visible immediately on opening the laptop, but there's an annoying hitch: Toshiba have taped it to the metal underneath the motherboard.

As a result, the motherboard will need moving enough to pull off the tape.

So to start, disconnect all the ribbon cables that aren't free-moving on one end. These are:

2 x USB controller cables

1 x trackpad cable

1 x Keyboard cable

1 x audio ports controller cable