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My front and back screen have cracks in them and im not sure where I can buy the parts to fix it
You can find these on Ebay if you don’t want to go through a supplier. A few good states suppliers are etechsupply, fixez (although their other parts aren’t as reliable). Make sure to buy the glass/lcd with frame. Do not buy just the glass. Unfortunately the screen assembly is very pricey for this model usually around $200. The back can be purchased for around $20-$40 I believe. Honestly if you don’t have experience replacing screens or opening newer samsungs I would strongly recommend letting a professional do this. It’s definitely a more difficult screen replacement job considering other models. Obviously use the iFixit guides on here if you chose to repair it..they couldn’t be more helpful!