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Traduzione in corso passo 1
The large board under everything is the logic board.
Removing this requires unscrewing 6 screws, 2 7.3mm T5 Torx and 4 8.4mm T5 Torx located around the edges of the logic board, which should have already been taken out when removing the fan.
Once all the screws are gone, be careful with the ports on top of the logic board. Gently wiggling helps.