Lenovo AIO V540-24IWL Hardware Maintenance Manual page 84

Before you open the computer cover, turn off the computer and wait several minutes until the computer is
cool.
Replacement procedure
1. Remove the computer stand. See "Computer stand" on page 57.
2. Remove the computer cover. See "Computer cover" on page 59.
3. Remove the internal speakers. See "Internal speakers" on page 61.
4. Remove the VESA mount bracket. See "VESA mount bracket" on page 62.
5. Remove the system board shield. See "System board shield and system fan" on page 63.
6. Disconnect the power button cable from the system board.
7. Remove the power button board.
8. Disconnect the power button cable from the power button board.
9. Reconnect the power button cable to the new power button board.
10. Install the new power button board.
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Hardware Maintenance Manual