Lenovo ThinkPad X390 Yoga Hardware Maintenance Manual page 86

Note: Dropping a system board from a height of as little as 0.15 m (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 material.
For access, remove these FRUs in order:
• "1010 ThinkPad Pen Pro" on page 64
• "1020 Nano-SIM card tray (for selected models)" on page 65
• "1030 Base cover assembly" on page 65
• "1040 Battery" on page 66
• "1050 I/O bracket" on page 68
• "1060 Wireless-WAN card (for selected models)" on page 68
• "1070 M.2 solid-state drive" on page 69
• "1090 Speaker assembly" on page 71
• "1110 Thermal fan assembly" on page 73
Attention: The microprocessor soldered on the system board is extremely sensitive. When you service the
system board, avoid any kind of rough handling.
Removal steps of the system board
80
X390 Yoga Hardware Maintenance Manual