Lenovo Yoga C640-13IML Hardware Maintenance Manual page 46

"Remove the lower case" on page 28
Step 1. Disconnect the battery pack cable from the system board.
Attention: Use your fingernail to disconnect the cable. Do not pull the cable.
Figure 22. Disconnect the battery cable
Step 2. Disconnect the camera cable and EDP cable from the system board.
Figure 23. Disconnect the camera cable and EDP cable
Step 3. Remove six screws.
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Lenovo Yoga C640-13IML Hardware Maintenance Manual