Replacing The Power Switch Board - Lenovo B40–30 Hardware Maintenance Manual

All-in-one computer

Hide thumbs Also See for B40–30:

Hardware maintenance manual (96 pages)

User manual (59 pages)

Hardware maintenance manual (85 pages)

Table Of Contents

Table of Contents

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 speaker system:

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 stand base. Refer to "Removing the stand base".

Step 5.

Remove the foot cover. Refer to "Removing the foot cover".

Step 6.

Remove the stand holder. Refer to "Removing the stand holder".

Step 7.

Remove the middle cover. Refer to "Removing the middle cover".

Step 8.

Remove the EMI cover. Refer to "Removing the EMI cover".

Step 9.

Disconnect the speaker cables from the connector on the motherboard.

Step 10. Lift up the speaker system to remove it.

Step 11. To install the new speaker system:

Place the new speaker system into position, then secure it with four screws.

Connect the new speaker cables to the connector on the motherboard.

Step 12. Reattach the EMI cover, middle cover, stand holder, foot cover and stand base.