Acer ASPIRE 5251 Service Manual page 88

6. Lift the inner edge of the mainboard up and out to free it from the lower case, without removing the mainboard
completely from the chassis.
CAUTION: Do not remove the mainboard completely. The mainboard is still connected to the chassis.
7. Carefully turn the mainboard over and place it on the protective mat.
CAUTION: Do not use excessive force when turning the mainboard over as it is still connected to the chassis
by the power cable.
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