Introduction
To replace the Satellite L755 motherboard you will need a Phillips (PH0) screwdriver. The motherboard is fragile and should not be bent or pried away from other parts or forced into place since it may break.
Tools
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            Begin by unscrewing the screw located underneath the battery. 
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            Then, unsnap and remove the bar above the keyboard. 
 
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            Next, unscrew the RAM cover and carefully remove it. Then, locate and unscrew the optical drive screw. 
 
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            Finally, detach the mounting bracket from the optical drive in order to attach it to the new optical drive then follow the steps in reverse to reassemble it. 
 
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            Remove the 5mm Phillips #0 screw in the middle of the motherboard, and the 4mm Phillips #0 screw on the upper left near the fan. 
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            Remove the four 4mm Phillips #0 screws under the edge covering flaps. 
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            Carefully lift out the motherboard and fan. 
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            To detach the fan, remove the two 2mm Phillips #0 screws. 
 
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To reassemble your device, follow these instructions in reverse order.