For Computers Shipped Without Optical Drive - Dell Inspiron 5570 Service Manual

7 Disconnect the battery cable from the system board.
8 Press and hold the power button for 5 seconds to ground the computer and
drain the flee power.

For computers shipped without optical drive

1 Loosen the three captive screws on the base cover.
2 Remove the screw (M2x4) that secures the base cover to the palm rest and
keyboard assembly.
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