Replacing The Button Board - Lenovo S40–40 Hardware Maintenance Manual

Step 6. Disconnect the two cables from the converter, and then remove the two screws that secure the
converter board to the optical drive bay.
Step 7. Lift up the converter board to remove it.
Step 8. To install the new converter board:
a. Line up the holes on the new converter board with the mounting holes on the optical drive bay
and secure the new converter board with the screws.
b. Connect the two cables to the new converter board.
Step 9. Reattach the rear cover and stand.

Replacing the button board

Note: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover.
Note: It may be helpful to place the computer face-down on a soft flat surface for this procedure. Lenovo
recommends that you use a blanket, towel, or other soft cloth to protect the computer screen from scratches
or other damage.
To replace the button board
Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating
system, and turn off the computer and all attached devices.
Step 2. Unplug all power cords from electrical outlets.
Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O)
cables, and any other cables that are connected to the computer. Refer to "Left and right view"
and "Rear view" for help with locating the various connectors.
Step 4. Remove the computer stand. Refer to "Removing the frame stand", "Removing the monitor stand",
or "Removing the transformer stand".
Step 5. Remove the rear cover. Refer to "Removing the rear cover".
Step 6. Disconnect the power cable from the button board and remove the three screws that secure
the button board to the front bezel.
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Chapter 8 Replacing hardware
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