System Board - Lenovo ThinkCentre M90a Pro Gen4 Hardware Maintenance Manual

• "Computer stand" on page 51.
• "Rear I/O cover" on page 54.
• "VESA mount bracket" on page 57.
• "Heat sink" on page 67.
Removal steps
Notes:
• Your microprocessor and socket might look different from the one illustrated.
• Touch only the edges of the microprocessor. Do not touch the gold contacts on the bottom.
• Do not drop anything onto the microprocessor socket while it is exposed. The socket pins must be kept
as clean as possible.

System board

Prerequisite
Before you start, read Generic Safety and Compliance Notices, and print the following instructions.
For access, do the following:
1. Remove the following parts in order, if any:
• "Computer stand" on page 51.
• "Rear I/O cover" on page 54.
• "System board shield" on page 55.
• "VESA mount bracket" on page 57.
• "Cover presence switch (intrusion switch)" on page 58.
• "Hard disk drive" on page 59.
• "Optical drive" on page 59.
• "M.2 solid-state drive" on page 61.
• "Thunderbolt card" on page 62
.
Chapter 6 Hardware removal and installation
69