Dell Inspiron One 2020 Owner's Manual page 70

Procedure
NOTE: Make a note of the cable routing before disconnecting the cables from the
system board.
NOTE: Your computer's Service Tag is stored in the system board.
You must enter the Service Tag in the BIOS after you replace the system board.
1 Disconnect all the cables from their connectors on the system board.
2 Remove the screws that secure the system board to the chassis.
3
Lift the system board at an angle and then slide it to release the connectors on the
system board from the slots on the chassis.
4 Remove the system board away from the chassis.
1 system board
70
| System Board
1
2 screws (5)
2