Need to replace your keyboard of Toshiba NB520 netbook,
below are the steps:
1. Slide two locks then take the battery out
3. Then open the top cover of keyboard, slowly not to damage the surface of the cover.
4. Now you can take out the keyboard
5. Remove the keyboard data cable by pushing the latch (see red arrow sign) then pull the data cable.
6. Install the new keyboard.