1180 System Board - Lenovo ThinkPad T490 Hardware Maintenance Manual

Step Screw (quantity)
4
M2 × 3 mm, wafer-head, nylon-coated (1)

1180 System board

Important notices for handling the system board:
When handling the system board, read the following:
• The system board has an accelerometer, which can be broken when several thousands of G-forces are applied.
Note: Dropping a system board from a height of as little as 6 inches so that it falls flat on a hard bench can subject
the accelerometer to as much as 6000 G's of shock.
• 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.
For access, remove these FRUs in order:
• "1010 Keyboard" on page 62
Color Torque
Black 0.181 Nm
(1.85 kgf-cm)
.
Chapter 8 Removing or replacing a FRU
83