Lenovo Yoga C640-13IML Hardware Maintenance Manual page 39

"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 11. Disconnect the battery cable
Step 2. Remove two screws. Then, remove the I/O brackets.
Figure 12. Remove two screws and remove the I/O brackets
Go to
https://support.lenovo.com/partslookup
part:
I/O brackets
to look up the Lenovo part number of the following replacement
.
Chapter 4 Removing a FRU or CRU
33