Lenovo IdeaPad Flex 5i Chromebook Plus Hardware Maintenance Manual page 50

Figure 28. Disconnect all cables
Step 2. Remove five screws. Then, remove the system board.
Figure 29. Remove five screws and the system board
Screw specifications
M2 x L2
M2 x L3
Go to https://support.lenovo.com/partslookup
replacement part:
System board
44
IdeaPad Flex 5i Chromebook (14", 7) and Lenovo Flex 5i Chromebook 14" Hardware Maintenance Manual
Number of screws
3
2
to look up the Lenovo part numbers of the following