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The LCD testing process has changed since iOS11 was released for aftermarket iPhone 7 and 7+ screens.
Please follow the procedure below to properly test your screens while performing screen replacements.
For testing a single screen:
You will need to install all components to the screen before turning the device on. This includes:
• Home Button
For testing more than one screen at a time:
Do not connect the 3D Touch flex cable! 3D touch will not being able to be tested until a full install of all components has been installed.