You should always test the screen before transferring over all the small parts. It won’t cause any damage to the phone. However, without the Home Button, the boot time may be longer. If the screen works fine, then transfer over the FCAM/HB and then test again before sealing the device.
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Be very careful with the flex cables as they can tear quite easily.
You should always test the screen before transferring over all the small parts. It won’t cause any damage to the phone. However, without the Home Button, the boot time may be longer. If the screen works fine, then transfer over the FCAM/HB and then test again before sealing the device.