System Board - Lenovo 12B800DDGE Hardware Maintenance Manual

Before you open the computer cover, turn off the computer and wait several minutes until the computer is
cool.
For access, do the following:
1. Turn off the computer and remove all connected devices and cables.
2. Unlock any locking device that secures the computer cover.
3. Place a soft, clean towel or cloth on the desk or surface. Hold the sides of your computer and gently lay
it down so that the screen is against the surface and the computer cover is facing up.
4. Remove the computer stand. See "Computer stand" on page 49.
5. Remove the rear cover. See "Rear cover" on page 52.
6. Remove the system board shielding. See "System board shielding" on page 54.
7. Remove the power supply unit. See "Power supply unit" on page 61.
Removal steps

System board

Prerequisite
Before you start, read Generic Safety and Compliance Notices, and print the following instructions.
Avoid contact with hot components inside the computer. During operation, some components become hot
enough to burn the skin. Before you open the computer cover, turn off the computer, disconnect power, and
wait approximately 10 minutes for the components to cool.
The heat-sink-and-fan assembly and microprocessor might be very hot. Before you open the computer
cover, turn off the computer and wait several minutes until the computer is cool.
For access, do the following:
1. Remove these parts in order, if any:
• Remove the computer stand. See "Computer stand" on page 49.
• Remove the rear cover. See "Rear cover" on page 52.
• Remove the system board shielding. See "System board shielding" on page 54.
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Chapter 6 Hardware removal and installation
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