Remove The Upper Case (With Keyboard) - Lenovo IdeaPad L3i Hardware Maintenance Manual

Figure 31. Remove the system board
Go to
https://support.lenovo.com/partslookup
replacement part:
System board

Remove the upper case (with keyboard)

Make sure the following FRU (or CRU) have been removed.
"Remove the ODD" on page 28
"Remove the lower case" on page 29
"Remove the battery pack" on page 30
Step 1. Disconnect the WLAN cables and the EDP cable.
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Lenovo IdeaPad L3i (15", 6) Hardware Maintenance Manual
to look up the Lenovo part numbers of the following