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Sep 27, 2016 7:15 PM in response to zigginlby chris_g1,Hi there, zigginl!
Thanks for using the Apple Support Communities. After reading your post, I am understanding that you see a flicker at the lower part of your iPhone 6 display when the brightness is turned up. I definitely want to help make sure that everything is working as expected!
I've got some troubleshooting I can suggest. Before you begin, please create a backup as detailed here: How to back up your iPhone, iPad, or iPod touch
Once you have your backup, try the following steps, in order. Test the display after each step, stopping when the issue is resolved.
- Restart your iPhone by following the steps here: Restart your iPhone, iPad, or iPod touch
- Reset your iPhone settings by going into Settings > General > Reset > Reset All Settings. This will not remove any of your personal information (contacts, pictures, Calendar events, etc) but will revert customizable settings (wallpaper/screen brightness, alert sounds/ringtones, Date & Time settings, etc) back to their factory defaults. It will also remove any saved Wi-Fi networks and passwords, as well as previously used APN or VPN settings.
- Restore your iPhone to factory settings, following the steps in this article: Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod touch to factory settings
After the restore is finished, set your iPhone up as a new device (without using the backup you created earlier, at least temporarily). Test the display; if it works as expected with full brightness, restore your backup using the steps here: Restore your iPhone, iPad, or iPod touch from a backup
- Restart your iPhone by following the steps here: Restart your iPhone, iPad, or iPod touch
