Lenovo B590 Notebook - Manual (Page 68)

Removal steps of I/O board
Remove the screws 1 , and then detach the cable. Remove the I/O board 4 .
3
2
1 1
4
Step Screw (quantity) Color Torque
1 M2 × 5 mm, flat-head, nylon-coated (2) Black 1.85 kgf-cm
When installing: Ensure that the cable is attached firmly to the system board.
1150 System board assembly and USB board
Important notices for handling the system board:
When handling the system board, bear the following in mind:
• Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite.
• Avoid rough handling of any kind.
• At every point in the process, be sure not to drop or stack the system board.
• If you put a system board down, be sure to put it only on a padded surface such as an ESD mat or a corrugated
conductive surface.
62 Hardware Maintenance Manual