Hi Zach! Sorry for the long time reply. I simply forgot to add some news about this repair. So last year, I ordered a new screen assembly. Replaced it and since it works flawlessly! No more visual glitches! During the disassembly, I noticed some liquid residue on the screen flex cables and some bad wrinkles on it. Here are some pictures of the repair: Thanks again for your help!
Hi, My friend send her iPhone 4 to an Apple Shop to change the phone. Apple replaces it without questions. I think that was a motherboard problem. Thank you for your answers.
Sorry for the response time. I had completely forgotten that I had this question on the forum. The problem was solved long time ago. The LCD was just dead. I replaced by a new and everything works fine. Hope it helps. carlitostyle