if u have smart phone or anything that have a camera on it use that for back up, not for something else.... OMG
take a picture all component original location before u go to work
example:
turn off the notebook and plug out the power cable
press all buttons one by one 5 times (not press and hold but fast press 5 times)----> all button from Esc to ...
turn on the notebook and try it
if that not work use another trick
1) take a picture of keyboard (for button location)
2) put out keyboard from notebook
3) release all button (careful cause some keyboard have legs on the button)
4) wash it with warm water, use towel or kanebo (don't use to much water) ----> put the water on towel and gently rub it ----> go to point 6
5) clean the button too----> go to point 6
6) burn smoke with tea in other hand -----> feel a live until all dry
7) use picture and put all button back to its place (selfie pic i suggest)