Remove The System Board - Lenovo IdeaPad Duet 3i Hardware Maintenance Manual

"Remove the LCD module" on page 28
"Remove the battery pack" on page 32
Step 1. Peel off the three pieces of tape.
Figure 25. Peel off the three pieces of tape
Step 2. Remove seven screws and then remove the heat sink.
Figure 26. Remove seven screws and then remove the heat sink
Screw specifications
M2.0 x L2.5
Go to https://support.lenovo.com/partslookup
part:
Heat sink

Remove the system board

Make sure the following FRUs (or CRUs) have been removed.
"Remove the card tray" on page 28
"Remove the LCD module" on page 28
"Remove the battery pack" on page 32
"Remove the front camera and rear camera" on page 34
"Remove the Wi-Fi module" on page 35
Number of screws
7
to look up the Lenovo part number of the following replacement
.
Chapter 4 Removing a FRU or CRU
41