Hi. If the screen is completely white and does not have any sign of a crack or black LCD ink, then there is a good chance that the connecter inside simply got dislodge - requiring that you should open that tablet up and try to reseat it. If reseating does not help, then the LCD will most likely be damaged and requiring that you should have it replaced. Otherwise, you can order the LDC or scree thereof from here
http://www.ittechsa.co.za/product/mobicel-cherry-tab-replacement-lcd-or-screen/