Sounds like a broken display assembly
If you're feeling savvy
Here's parts
http://www.googleadservices.com/pagead/aclk?sa=L&ai=Cpp6BVqCWVvqDCImxfJPxhdAClMjuggjcitSJuALc6LOIrQMIBBAHIPiZixIoCmDJtuCJlKSYE6AB76nS0QPIAQeqBCdP0KlflhVsN3L7L_Gg20KZ_CGLmRGBELKdbubTImcgCMwmhsMUAZKABZfgvAvABQWIBgGgBibYBgKAB66Z_g6QBwOoB6a-G9gHAeASjtvB6JCVk_eyAQ&ohost=www.google.com&cid=CAASIuRoeZmRiu5662b49Q7KLIFH5f2R_nzCuMPCJIt2FGyMe9I&sig=AOD64_2xHEeuVEU_l-xYyK9KVMPjl25NbQ&ctype=5&clui=13&q=&ved=0ahUKEwi3naaAvqfKAhXJFx4KHcfCCAgQwg8IKQ&adurl=http://www.dhgate.com/product/for-samsung-galaxy-grand-prime-g530-g530f/236850092.html%3Futm_source%3Dpla%26utm_medium%3DGMC%26utm_campaign%3Dtanglinasa%26utm_term%3D236850092%26f%3Dbm%257c236850092%257c105004-CellPhoneParts%257cGMC%257cAdwords%257cpla%257ctanglinasa%257cUS%257c105004001-CellPhoneLCDTouchPanels%257cm%257c%257c0LWF%257c
Here's labor
http://m.youtube.com/watch?v=hHDBYRmepdI
If you don't feel comfortable, and /or don't have much experience, you can find a local repair shop, that can do this for you