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My sister’s LG G3 rear facing camera lens broke and i have purchased a lens with adhesive from e-bay. My question is: how to completely remove the broken lens and what should i look for when i’m applying the adhesive and the new lens.

Wowza. You’re real diy over there. Ok, so you’ll want to use an xacto knife and carefully remove the lens. Go slow. Very slow. Clean the area. Gently scrape the ring around the hole. You could probably skimp on the % of isopropyl alcohol this time. Maybe you have some laying around? Be very careful, dab it on your jeans or something. Don’t have the q tip dripping. Wait for that to dry, ten minutes is more than enough, then apply the new adhesive and lens, leave it back down so the camera lens is on the table, so it can adhere