Lenovo 100w Gen 4 Hardware Maintenance Manual page 74

• Some components mounted on a system board are very sensitive. Improper handling of a system board
can cause damage to those components, and may cause a system malfunction.
• 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.
• Avoid bending a system board and hard pushing to prevent cracking at each BGA (Ball Grid Array)
chipset.
For access, remove these FRUs in order:
• "1010 Keyboard " on page 49
• "1020 Base cover assembly" on page 52
• "1030 M.2 solid-state drive and thermal pad" on page 55
• "1040 Wireless WAN card (for selected models of Lenovo 300w Yoga Gen 4 only)" on page 57
• "1050 Wireless LAN card (for selected models)" on page 57
• "1070 Daughter board cable" on page 59
• "1110 Built-in battery" on page 61
• "1120 USB-C bracket" on page 62
• "1130 Main wireless WAN antenna (for wireless WAN models of Lenovo 300w Yoga Gen 4 only)" on page
63
• "1140 Speaker assembly" on page 64
• "1150 Trackpad cable" on page 65
• "1160 Lenovo Integrated Pen board and cable (for selected models of Lenovo 300w Yoga Gen 4 / Lenovo
500w Yoga Gen 4)" on page 66
• "1170 Camera and camera cable (for selected models of Lenovo 300w Yoga Gen 4 / Lenovo 500w Yoga
Gen 4)" on page 67
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Lenovo 100w Gen 4/300w Yoga Gen 4/500w Yoga Gen 4 Hardware Maintenance Manual