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9.Before removing the main board entirely, carefully release the white clip securing the Ethernet/USB board flat cable and disconnect the cable from the main board.
Fig. 30 Location of Ethernet/USB flat cable.
10. Lift the main board out of the casing.
Note: Optionally, you can disconnect the other end of the flat cable from the switch board.
CPU and Heat Sink
To remove the CPU and the heat sink, first remove the main board (see Main Board on page 15) and then perform the following steps:
1. Turn the eight screws securing the heat sink halfway loose in designated order.
Fig. 31 Location of CPU heat sink screws.
2.Now turn the screws completely loose, again in designated order, and remove them (see Fig. 31 on page 18).
3.Carefully remove the heat sink.
Packard Bell EasyNote ST Disassembly Manual