I ordered a tablet online my grandson had it for two weeks now and he was playing with it last night and the screen went all white with black lines can I return it at the store I have no receipt and get another one

Walmart regularly sell the same apparent model as you find at other stores, but there will be a W or WM in the model number that product is make by the manufacturer to look like the real thing,but is made cheaper so the Walton family can get richer.

Yes.. you can.. they will need to give store credit w/o a receipt and it needs to be something they actually carry at that particular stores inventory.... you can get another one with the store credit they give you.