I noticed that when I turn off the screen ,yellow horizontal lines flash on the screen. It does that randomly, not every time. Sometimes it’s just 1 line, sometimes it’s multiple. The lines disappeared after 1 second.
iPhone 13 Pro Max, iOS 16
Hello ankon701,
Be sure to try checking for any available iOS updates as that'll ensure the device uses the latest available improvements/fixes. For reference, the current latest version is iOS 16.3.1.
This page can help out with updating if needed: Update your iPhone or iPad - Apple Support
Update your iPhone or iPad wirelessly
1. Back up your device using iCloud or your computer.
2. Plug your device into power and connect to the internet with Wi-Fi.
3. Go to Settings > General, then tap Software Update.
4. If you see more than one software update option available, choose the one that you want to install.
5. Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do.
If you continue to have issues you may use this link to follow-up with Apple Support to help investigate it further: Apple Support
Cheers.
Hey there ankon701,
If the issue is still occurring after updating iOS, reach out to Apple Support at the following link so they can look further into this with you. You can use this link to help you reach out:
Take care.
Thanks for your response.I have installed latest software update which is currently ios 16.3.1 but the lines still appears.
Appearing horizontal lines while turning off the screen
