LCD screen is totally white and absent of color

Sounds like a loose ribbon cable -- the one that connects the screen to the circuitry inside the camera.

Try squeezing the body of the camera near the bottom 'Samsung' logo, to try to snug-up the connection. Brace the front (under the lens) with your index fingers, and press firmly with your thumbs on the back over the logo just under the screen.

You might try squeezing around the other edges of the screen for good measure in case something else came loose.

-Fionn