Lenovo B490 Notebook - Manual (Page 67)

Removal steps of system board assembly and USB board
Remove the screws 1 , and then detach the connectors as shown in the following illustration.
1
1
3
4
2
5
8
9
1
7
6
Step Screw (quantity) Color Torque
1 M2 × 6 mm, flat-head, nylon-coated (2) Black 1.85 kgf-cm
When installing: Ensure that all the connectors are attached firmly.
Remove the system board in the direction shown by the arrows 10 and 11 . Then detach the DC-in cable 12 .
12
10
11
Chapter 7 . Removing and replacing a FRU 61