Lenovo ThinkPad T550 User Manual page 144

2. Insert the keyboard into the space under the frame of the keyboard bezel as shown. Ensure that the front
edge of the keyboard (the edge that is close to the display) is under the frame of the keyboard bezel.
3. Reveal the screw heads by sliding the keyboard frame forward with the flat end of the keyboard
multi-tool. Ensure that the screw heads are exposed completely.
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User Guide