Lenovo Legion 7 Series Hardware Maintenance Manual page 47

Figure 22. Remove four screws and remove the system board
Screw specifications
M2 x L3
M2 x L6
Step 4. Disconnect the LED board cable (vent lighting) from the system board and then remove the LED
board cable (vent lighting).
Figure 23. Remove the LED board cable (vent lighting)
Step 5. Disconnect the power board cable from the system board and then remove the power board cable.
Figure 24. Remove the power board cable
Go to
https://support.lenovo.com/partslookup
replacement parts:
System board
Power board cable
LED board cable (vent lighting)
Number of screws
3
1
to look up the Lenovo part numbers of the following
.
Chapter 4 Removing a FRU or CRU
41