Replacing The Cpu - Lenovo ideacentre AIO 520 Hardware Maintenance Manual

Attention: Place the heat-sink upside down on a flat surface to prevent thermal grease from contaminating
other components.
Attention: Use an alcohol pad to wipe the thermal grease off the CPU.
Step 8. To install the new heat-sink:
a. Position the new heat-sink on the motherboard so that the nine screws are aligned with the
holes in the motherboard and wind shielding.
b. Tighten the screws in numeric order to secure the new heat-sink to the motherboard.
Step 9. Reattach the camera module, rear cover and stand base.

Replacing the CPU

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 CPU
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 heat-sink. Refer to "Replacing the heat sink".
Step 5. Lift the small handle and open the retainer.
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ideacentre All-In-One 520 (22 & 24 inch) Computer Hardware Maintenance Manual