Removing The Motherboard Frame - Lenovo ideacentre All-In-One 520 Hardware Maintenance Manual

Step 12. To reattach the rear cover:
a. Reconnect the cable to the motherboard.
b. Line up the motherboard frame with the chassis.
c. Align the rear cover with the chassis.
d. Press the rear cover until it snaps into position.

Removing the motherboard frame

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 remove the middle cover:
Step 1. Remove any media 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 Locating connectors,
controls and components to locate the various connectors.
Step 4. Remove the stand base. Refer to Removing the stand base.
Step 5. Remove the rear cover. Refer to Removing the rear cover.
Step 6. Remove the eight screws that secure the motherboard frame to the chassis.
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Chapter 8 Replacing hardware
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