Lenovo x3650 M4 BD 5466 Installation And Service Manual page 256

Figure 186. 9 screws
Step 14. Grasp two holders and slightly lift the system board.
Figure 187. System board removal
Step 15. Gently push the external input/output connectors out of their respective holes in the chassis.
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Lenovo System x3650 M4 BDInstallation and Service Guide