Remove The Thermal Cover - Lenovo Yoga C940–15IRH Hardware Maintenance Manual

Figure 28. Remove two screws
Callout number
1
Step 2. Disconnect the wireless antenna cables.
Figure 29. Disconnect the cables.
Go to https://support.lenovo.com/partslookup
replacement part:
Wireless antenna cable

Remove the thermal cover

Make sure the following FRU (or CRU) have been removed.
Screw specifications
M2 x L3.5
to look up the Lenovo part numbers of the following
Number of screws
2
.
Chapter 4 Removing a FRU or CRU
45