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so my phone fell and the top layer is fine but cracks are below it and the lcd is obviously busted but im not sure what to buy and how much it will cost ive replaced other electronics screens before so i know i can if i get the right part

Sadly, you will have to replace both the glass screen and the LCD as they are one assembly. You can buy the part below. I also included a guide on how to do this repair too. Galaxy S5 Screen Samsung Galaxy S5 Display Assembly Replacement

Check out www.mobiledefenders.com they have all of the parts you need for a good price.