21 removing the coin-cell battery, 22 replacing the coin-cell battery, 23 removing the heat-sink – Dell Inspiron 15 (3521, Late 2012) User Manual

Page 5: 24 replacing the heat-sink, 25 removing the fan, 26 replacing the fan, 27 removing the speakers, 28 replacing the speakers, 29 removing the display assembly, 30 replacing the display assembly