I have replaced the housing of my iPhone 8 plus. When I start it up it shows the apple logo and after a few seconds it turns off. After a few seconds it turns on again and this goes on and on. Does anyone have any idea why this is happening and how can I fix it?
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When doing a housing replacement, a lot of things can go wrong and it can be hard to figure out what is causing the issue. You need to reduce the number of variables.
I would start by testing a bare-bones setup. Start by disconnecting the battery first (always!). Then disconnect the digitizer, LCD, charging coil, front camera, rear camera and home button extension flex. Now re-connect the battery; you should only have the battery and Lightning Dock flex connected. Connect a known-good, preferably Apple-original Lightning cable to an iTunes enabled computer.
Does iTunes recognize your phone? If so, then you should re-connect one flex at a time until the phone stops working. I would start with the charging coil, then the Home button flex, then add the rear camera, LCD & Digitizer.
If the bare-bones setup does not get recognized by iTunes, then you most likely have a logic board issue. You could send it (or find a local) to a repair shop that specializes in micro-soldering repair.
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I have tried it like you said, iTunes recognizes my iPhone. But when I connect the flex for the lcd it stops working.
Now when I plug it in my pc iTunes comes up and says that it has to set the phone to factory settings. After the phone has been installed to factory settings iTunes wants to do the same thing again. I also tried other LCD’s but and that also doesn’t work.
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