This video will demonstrate the removal procedure of the Keyboard in your Latitude 3340.
Welcome to Del Tech support in this video.
We'll go over the steps for performing a part replacement on your Dell PC slide tabs outward to unlock and remove battery using a small flathead screwdriver carefully, pry up the bezel.
Next unscrew the keyboard, then carefully turn the keyboard over and unplug the keyboard cable. Now, remove the keyboard once replaced your PC should be ready to be used again.