Disable Fast Startup and the built-in battery. . . . 53
Replace a CRU . . . . . . . . . . . . . . . 54
Base cover assembly (for T490 and P43s
only) . . . . . . . . . . . . . . . . . 54
Base cover assembly (for T590 and P53s
only) . . . . . . . . . . . . . . . . . 56
Memory module (for selected models) . . . . 58
M.2 solid-state drive . . . . . . . . . . . 59
Coin-cell battery. . . . . . . . . . . . . 63
Wireless WAN card (for selected models) . . . 64
Keyboard . . . . . . . . . . . . . . . 67
Speaker assembly . . . . . . . . . . . . 73
Always On USB 3.1 connector Gen 1 board . . 75
Chapter 8. Help and support . . . . . 77
Frequently asked questions . . . . . . . . . . 77
Error messages . . . . . . . . . . . . . . . 78
Beep errors . . . . . . . . . . . . . . . . 79
Self-help resources . . . . . . . . . . . . . 80
Call Lenovo . . . . . . . . . . . . . . . . 81
Before you contact Lenovo . . . . . . . . 81
Lenovo Customer Support Center . . . . . . 82
Purchase additional services. . . . . . . . . . 83
Appendix A. Important safety
information . . . . . . . . . . . . . . . 85
Appendix B. Accessibility and
ergonomic information . . . . . . . . 99
Appendix C. Supplemental
information about the Linux operating
system . . . . . . . . . . . . . . . . . 103
Appendix D. Compliance
information . . . . . . . . . . . . . . . 105
Appendix E. Notices and
trademarks . . . . . . . . . . . . . . . 119
ii T490, T590, P43s, and P53s User Guide
