Siemens SIMATIC HMI IPC677C Operating Instructions Manual page 144

Service and maintenance
11.8 Removing and installing hardware components
How to remove the motherboard
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Remove the power supply cover.
Remove the power supply.
Remove the bus board.
Disconnect all cables from the motherboard, noting down their positions while doing so.
①
Remove the screws (6 pieces) and then the screws
heat sink.
Remove the hexagon bolts (6 pieces) from the ports.
Remove the motherboard.
②
(4 pieces). Remove the processor
SIMATIC HMI IPC677C
Operating Instructions, 04/2013, A5E02722710-04