System Board - Lenovo ThinkCentre M70s Hardware Maintenance Manual

3. Remove the cover presence switch.
4. Install the cover presence switch.
5. Connect the new cover presence switch cable to the system board.
6. Reinstall all removed parts. Then, reconnect all disconnected cables to the computer and reconnect the
power cord to the electrical outlet.

System board

Prerequisite
Before you start, read Chapter 1 "Important safety information" on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer cover. See "Computer cover" on page 61.
2. Remove the front bezel. See "Front bezel" on page 62.
3. Remove the drive bay assembly. See "Drive bay assembly" on page 65.
4. Remove all the memory modules. See "Memory module" on page 82.
5. Remove the front I/O bracket. See "Front I/O bracket and power button" on page 93.
6. Remove the heat sink and fan assembly. See "Heat sink and fan assembly" on page 96.
7. Remove the microprocessor. See "Microprocessor" on page 98.
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Chapter 6 Hardware removal and installation
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