Lenovo N21 Chromebook Hardware Maintenance Manual page 42

"Remove the I/O board" on page 32
"Remove the WLAN & Bluetooth combo module" on page 33
"Remove the LCD module" on page 34
Step 1. Unplug the DC-in cable
a
Figure 19. Unplug the DC-in cable
Step 2. Loosen the two screws
Figure 20. Remove the thermal module
Step 3. Remove the five screws
Figure 21. Remove the system board
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Hardware Maintenance Manual
1 .
2 and then remove the thermal module.
3 and then remove the system board.