ContentsAbout this manual . . . . . . . . . . . . iiiChapter 1. Safety information . . . . . . 1General safety . . . . . . . . . . . . . . . . 1Electrical safety . . . . . . . . . . . . . . . . 1Safety inspection guide . . . . . . . . . . . . . 3Handling devices that are sensitive to electrostaticdischarge . . . . . . . . . . . . . . . . . . 3Grounding requirements . . . . . . . . . . . . 4Safety notices (multilingual translations) . . . . . . 4Chapter 2. General checkout . . . . . 21What to do first . . . . . . . . . . . . . . . 21Checking the ac power adapter . . . . . . . . 22Checking the battery and operational charging . . 22Chapter 3. Locations . . . . . . . . . 25Locating computer controls and connectors . . . 25Overview . . . . . . . . . . . . . . . 25Lenovo 10w Detachable Keyboard (forselected models) . . . . . . . . . . . . 26Locating FRUs and CRUs . . . . . . . . . . . 28Major FRUs and CRUs . . . . . . . . . . 29Miscellaneous parts . . . . . . . . . . . 31Looking up FRU information . . . . . . . . . . 31Chapter 4. FRU replacementnotices . . . . . . . . . . . . . . . . . 33Service tool kit . . . . . . . . . . . . . . . 33Screw notices . . . . . . . . . . . . . . . 33Chapter 5. Removing or replacing aFRU. . . . . . . . . . . . . . . . . . . 35General guidelines. . . . . . . . . . . . . . 35Before servicing the computer . . . . . . . . . 35Disable Fast Startup and the built-in battery . . 351010 Lenovo Integrated Pen (for selectedmodels) . . . . . . . . . . . . . . . . . . 361020 Pen dummy (for selected models) . . . . . 361030 LCD unit and LCD cable . . . . . . . . . 361040 I/O board cable. . . . . . . . . . . . . 381050 Built-in battery . . . . . . . . . . . . . 391060 Charger cable bracket . . . . . . . . . . 401070 I/O board bracket . . . . . . . . . . . . 411080 Rear camera and rear camera bracket . . . . 411090 Pen charger cable. . . . . . . . . . . . 421100 Microphone board cable . . . . . . . . . 421110 I/O board and function board cable . . . . . 431120 Pogo pin cable . . . . . . . . . . . . . 441130 Speaker assembly . . . . . . . . . . . 441140 Front camera with cable . . . . . . . . . 451150 Microphone board, microphone rubber andrear LED rubber . . . . . . . . . . . . . . . 451160 Wireless LAN antennas. . . . . . . . . . 461170 Heatsink . . . . . . . . . . . . . . . 471180 System board . . . . . . . . . . . . . 481190 Base cover assembly . . . . . . . . . . 49Appendix A. Notices . . . . . . . . . . 51Appendix B. Abbreviation table . . . . 53© Copyright Lenovo 2022 i