Lenovo ThinkPad P40 Yoga User Manual page 154

3. Remove the base cover assembly. See "Replacing the base cover assembly" on page 124.
4. Remove the button I/O card. See "Replacing the button I/O card" on page 131.
5. Detach the connectors.
6. Remove the screws. Then remove the speaker assembly.
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ThinkPad P40 Yoga, ThinkPad S3, ThinkPad Yoga 14, and ThinkPad Yoga 460 User Guide