Lenovo IdeaPad S740-15IRH Hardware Maintenance Manual page 39

"Remove the lower case" on page 26
"Remove the battery pack" on page 27
Step 1. Disconnect the speaker cable from the system board and release the cables from hooks.
Figure 13. Disconnect the cable and release the cables from hooks
Step 2. Carefully remove the speakers.
Figure 14. Remove the speakers
Go to
https://support.lenovo.com/partslookup
part:
Speakers
to look up the Lenovo part number of the following replacement
.
Chapter 4 Removing a FRU or CRU
33