Lenovo B480 Notebook - Manual (Page 65)

Removal steps of I/O board
Remove the screws 1 , and then detach the cable.
1
1
3
2
Step Screw (quantity) Color Torque
1 M2 × 6 mm, flat-head, nylon-coated (2) Black 1.85 kgf-cm
When installing: Make sure that the cable is attached firmly to the system board.
Chapter 7 . Removing and replacing a FRU 59