Acer Aspire M3900 - Removing the Mainboard

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Removing the Mainboard
1. Disconnect the power switch, top USB, and top audio cables from the mainboard.
2. Remove the eight screws that secure the mainboard to the chassis.
Note:Circuit boards >10 cm² has been highlighted with the yellow rectangle as above image shows.
Please detach the Circuit boards and follow local regulations for disposal.