Dell Latitude E5420 (Early 2011) - Manual (Page 105)

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Installing the System Board
Installing the System Board
1. Align the system board to the port connectors and place the system board in the computer.
2. Engage the connector on the back of the system board to the input/output (I/O panel).
3. Tighten the screws to secure the system board.
4. Connect the following cables to the system board:
– thermal fan cable
– speaker cable
– audio board cable
– bluetooth cable
5. Replace the support brackets .
6. Replace the LED board .
7. Replace the display assembly .
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