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If the keys of your keyboard are unresponsive or damaged, replacing the individual keys or the entire keyboard might be necessary.
This guide will lead you through replacing the keyboard of a Dell Latitude 7420.
Before starting, please ensure the device is turned off and disconnected from any adaptors or charging cables.
Likewise, use an anti-static band or mat when opening computers or handling components.
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Remove the eight, 7 mm screws from the back case using a Phillips #0 screwdriver.
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Use an opening pick or opening tool and work your way around the periphery of the base cover to separate it from the chassis.
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Using the Phillips #1 screwdriver, remove the five 5 mm screws securing the battery to the motherboard.
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Use a spudger to pry up each side of the battery connector. Then, lift the connector straight up from its socket.
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Unplug the speaker cable by pulling it down, then carefully unthread the cable from the battery
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Gently remove the battery from its housing.
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Use a Phillips #00 screwdriver to remove the two 2.0 mm screws holding down the SSD cover.
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Remove the SSD cover.
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Pull the SSD card by its left edge to slide it out of the socket.
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Use a cloth and dust blower to clean the vents.
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Use a Phillips #00 screwdriver to remove the six 2.5 mm screws securing the fan assembly.
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Use the pointed tip of a spudger to carefully push on each side of the connector and remove it from the socket.
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Remove the fan assembly.
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Use a Phillips #00 screwdriver to remove the single 2.5 mm screw from the audio board.
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Use a spudger or your fingernail to flip the black cover open.
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Slide the ribbon cable out from the ZIF connector.
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Remove the audio board.
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Use a Phillips #00 screwdriver to remove the screws securing the motherboard to the device.
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Remove the connectors to the system board.
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Place the tip of your opening tool under the edge of the connector, and pry the connector straight up from its socket.
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Use the tip of a spudger or your fingernail to flip up the small locking flaps from these ZIF connectors. Then, you can safely pull the cables out.
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Slide a thin, ESD-safe pry tool or tweezers under the wire until it's snug against the connector, and pry straight up from the board to disconnect these coaxial cables.
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To remove the blue connector, pull the cable away from the connector in the same direction that the individual wires are running.
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Lift the final connector up from the socket.
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Use a Phillips #00 screwdriver to remove two 4.0 mm screws from the I/O board.
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Remove the I/O board from the device.
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Use a Phillips #00 screwdriver to remove the twenty 1.7 mm screws securing the keyboard.
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Use the tip of a spudger or your fingernail to flip up the small locking flap on the remaining cables. Then, you can safely pull them out.
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Pull the keyboard out from the chassis.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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