Lenovo ThinkPad X390, Hardware Maintenance Manual, Page: 86 / 108

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
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X390 Yoga Hardware Maintenance Manual