Lenovo ThinkBook 14 G4 IAP Hardware Maintenance Manual page 82

"Remove the memory module" on page 68
"Remove the I/O bracket (left)" on page 70
Step 1. Disconnect cables connected to the system board.
Figure 74. Disconnect cables
Step 2. Remove one screw and then remove the system board.
Figure 75. Remove the system board
Screw specifications
M2.0 x L3.0
Go to https://support.lenovo.com/partslookup
part:
System board
Use a Golden Key U1 tool to flash-write key id information
After replacing the system board and re-assembling the computer, use a pre-made Golden Key U1 tool to
start the computer and flash-write the serial number (SN), machine type (MT), product name (PN), and UUID
to the new system board.
76
Hardware Maintenance Manual
Number of screws
1
to look up the Lenovo part number of the following replacement