28. Place the computer in an upright position.
29. If a locking device is available, use it to lock the computer.
30. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Wi-Fi antennas
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Replacement procedure
1. Remove the computer stand. See “Computer stand” on page 61.
2. Remove the rear cover. See “Rear cover” on page 65.
3. Remove the optical drive. See “Optical drive” on page 66.
4. Remove the optical drive holder. See “Optical drive holder” on page 69.
5. Remove the system board shield. See “System board shield” on page 71.
6. Remove the VESA mount bracket cover. See “VESA mount bracket cover” on page 74.
7. Remove the VESA mount bracket. See “VESA mount bracket” on page 76.
8. Remove the storage drive. See “Storage drive and storage drive bracket” on page 78.
9. Remove the system fan. See “System fan” on page 83.
10. Remove the heat sink. See “Heat sink” on page 85.
11. Remove the bump cover. See “Bump cover” on page 88.
12. Remove the M.2 solid-state drive. See “M.2 solid-state drive” on page 90.
13. Remove the microprocessor. See “Microprocessor” on page 94.
14. Remove the serial connector module. See “Serial connector module” on page 100.
15. Remove cable cover. See “Cable cover” on page 102.
16. Remove all memory modules. See “Memory module” on page 104.
17. Remove the Wi-Fi card. See “Wi-Fi card” on page 107.
18. Remove the cover presence switch (intrusion switch). See “Cover presence switch (intrusion switch)” on
page 113.
19. Remove the M90a e-Privacy button board. See “E-Privacy button board (M90a)” on page 115.
20. Remove the card reader. See “Card reader” on page 116.
21. Remove the system board. See “System board” on page 119.
22. Remove the internal speakers. See “Internal speakers” on page 122.
23. Remove the M90a I/O brackets. See “I/O brackets (M90a)” on page 124.
24. Remove the integrated camera and microphone module. See “Integrated camera and microphone
module” on page 127.
25. Remove the main frame. See “Main frame” on page 130.
26. Depending on your computer model, refer to one of the following to replace the Wi-Fi antennas.
• M70a
136
M70a and M90a Hardware Maintenance Manual
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