Secret Code for Display Test
can anyone help me?? Dis Apple had a secret code like Samsung (*#0*#) ??
完整的更换指南，从初代iPhone、iPhone 3G、iPhone 3GS、iPhone 4、iPhone 4s、iPhone 5、iPhone 5c，iPhone 5S，iPhone 6、iPhone 6 Plus，iPhone 6S，iPhone 6S plus，iPhone 7，iPhone 7 plus，iPhone 8, iPhone 8 Plus, 和 iPhone X.
Hello: No secret code. However, the link to the APP for a screen test is in the iTunes store. As of August 23rd, 2017 you have Version 4.0.
You can test the pixels, touch, pinch, move, multi-touch on 6s and beyond.
Remember, aftermarket replacement screens DO NOT provide the moisture seals, response, and drop performance so please use Apple Care or a Certified replacement brand such as eVero. Your iPhone is worth it.
Enjoy, have fun.