Is your friend running the latest version of iOS? I believe a while back Apple released an update so that third-party displays would not work with an iPhone. However, newer iOS updates allow one to use a third-party display. If the phone is not running iOS 11.4, try to update it and see what happens.
I believe it would be best if you 3D print a new logo. There is one on the Thingiverse. https://www.thingiverse.com/thing:280232... You will probably have to edit the file a little bit before you can print it. Do you have any experience with 3D modeling software?
Try to reinstall OS X again. Shut down the computer, then press the power button. Immediately hold the Command and R keys. Continue holding them until you see an Apple logo or a spinning globe. Click on "Reinstall macOS". An installer should display itself. Follow the steps it guides you through. Keep in mind that this will erase all of your data on the drive you are installing macOS on.
Hello, My iPhone 7 was doing the same thing. What is your model number? If you are unsure of how to identify your model number or if your iPhone 7 has the model number A1660, visit this site. Also, if your iPhone 7 has the model number A1660, try to take it in to Apple to get it replaced. However, if they will not replace it, contact your carrier. My carrier replaced my phone under warranty free of charge.
Es el interior que es diferente. El iPhone 8 tiene un sensor de cámara más grande. También presenta carga inalámbrica. Edit: Olvidé mencionar que el iPhone 8 tiene espalda de vidrio, mientras que el iPhone 7 tiene una espalda de aluminio.