Lenovo 21DK0047IX Hardware Maintenance Manual page 54

"Remove the I/O bracket (right)" on page 45
"Remove the I/O board with cable" on page 46
Step 1. Disconnect the power board cable from the power board.
Figure 29. Disconnect the power board cable from the power board
Step 2. Peel off the tape carefully.
Figure 30. Peel off the tape carefully
Step 3. Remove two screws and then remove the power board.
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Hardware Maintenance Manual