Remove The Wlan Card - Lenovo IdeaPad S740 Hardware Maintenance Manual

Step 2. Release speaker cable from system board hooks and carefully remove the speakers.
Figure 8. Release the cable and remove the speakers
Go to
https://support.lenovo.com/partslookup
part:
Speakers

Remove the WLAN card

Make sure the following FRUs (CRUs) have been removed.
"Remove the lower case" on page 26
"Remove the battery pack" on page 27
Step 1. Peel off the mylar tape covering the WLAN card.
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Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual
to look up the Lenovo part number of the following replacement