iPhone Screen Flashing? Causes & Fixes

Updated 6 November 2026 · Standard formula, shown below

If your iPhone screen is flashing, flickering, or blinking, the cause is usually a software glitch, an auto-brightness issue, or a hardware problem with the display or its connection. Start by restarting your iPhone and checking the brightness settings; if the flashing persists, you’ll need to work through the troubleshooting steps below to isolate the issue.

Common Causes of iPhone Screen Flashing

Screen flashing on an iPhone can stem from several different sources. Understanding the likely culprits helps you choose the right fix.

Software bugs: A temporary glitch in iOS or a specific app can cause the display to refresh incorrectly, leading to flicker.
Auto-brightness and True Tone: The ambient light sensor and True Tone feature adjust the screen based on lighting. If they malfunction, you may see brightness fluctuations that look like flashing.
Hardware damage: A drop, impact, or liquid exposure can damage the display panel, the flex cable connecting it to the logic board, or the logic board itself.
Overheating: When the iPhone gets too hot, it may dim the screen or cause display anomalies as a protective measure.
Faulty app: An app that isn’t optimized for your iOS version can cause display rendering issues.

Quick Fixes to Try First

Before diving into more complex solutions, try these simple steps. They resolve a surprising number of flashing issues.

Force restart your iPhone. The method varies by model. For iPhone 8 and later, press and quickly release Volume Up, then Volume Down, then press and hold the Side button until the Apple logo appears. For iPhone 7, hold the Side and Volume Down buttons. For iPhone 6s and earlier, hold the Home and Top (or Side) buttons.
Turn off True Tone and Auto-Brightness. Go to Settings > Display & Brightness and toggle off True Tone. Then go to Settings > Accessibility > Display & Text Size and toggle off Auto-Brightness. See if the flashing stops.
Check for a stuck app. If the flashing only happens when a specific app is open, close it by swiping up from the bottom of the screen and then swiping the app card away. If the issue persists, try uninstalling and reinstalling the app.
Update iOS. Go to Settings > General > Software Update and install any available updates. Apple frequently fixes display-related bugs in iOS updates.

When the Issue Is Hardware Related

If the software fixes don’t work, the flashing likely points to a hardware problem. The most common hardware causes are:

Damaged display panel: Physical damage, even if not visible, can cause the screen to flicker or flash.
Loose or damaged display cable: Inside the iPhone, a thin cable connects the screen to the motherboard. A drop can loosen this cable, causing intermittent flashing.
Logic board issues: Less commonly, a fault on the logic board itself can cause display problems.
Battery issues: A weak or failing battery can cause voltage fluctuations, which may manifest as screen flickering, especially under load.

If you suspect a hardware problem, the safest course is to contact Apple Support or visit an Apple Store or an Apple Authorized Service Provider. They have the diagnostic tools to pinpoint the issue. Attempting to open the iPhone yourself can cause further damage and void any warranty.

Why Does the Screen Flash When Unlocking or in Low Light?

A common scenario is flashing when using Face ID or when the phone is in a dark room. This is often related to the display’s refresh rate and the ambient light sensor.

ProMotion displays: iPhones with ProMotion (iPhone 13 Pro and later) have a variable refresh rate from 10Hz to 120Hz. A bug in the software that controls this refresh rate can cause a visible flash when the rate changes abruptly.
True Tone and Night Shift: These features continuously adjust the white balance and brightness. In a dark room, the sensor might be reading light changes from the screen itself, creating a feedback loop that appears as flashing.
Face ID: The infrared projector used by Face ID is invisible, but the screen may briefly flash to adjust for the sensor. If this happens repeatedly, it’s a sign of a software or hardware issue.

iPhone Screen Flashing vs. Other Display Problems

It’s helpful to distinguish flashing from other display issues, as the fixes differ.

Flickering (dimming and brightening): Often caused by auto-brightness or True Tone. Try disabling them.
White or black screen: Usually a more serious hardware failure or a complete software crash. A force restart is the first step.
Lines on the screen: Typically indicates physical damage to the display or its cable.
Dead pixels: Small, permanent dots that don’t change. This is a hardware defect.
Static or distortion: Can be a GPU or logic board issue, especially if it happens during graphically intensive tasks.

What to Do If the Screen Keeps Flashing After a Drop

If the flashing started after your iPhone was dropped or hit, it’s almost certainly hardware damage. The internal display cable may have come loose, or the screen itself may be cracked internally.

Back up your iPhone immediately. Connect to a computer or iCloud and make sure your data is safe.
Stop using the device. Continued use could cause further damage, especially if there’s a loose component.
Check your warranty. If the iPhone is under AppleCare+ or the standard one-year warranty, and the damage isn’t from accidental damage, it may be covered. Accidental damage is covered under AppleCare+ with a service fee.
Get a professional diagnostic. Even if the screen looks fine, the internal connection could be damaged. A technician can open it and reseat the cable, which might be a cheap fix. If the screen is damaged, it will need replacement.

Frequently Asked Questions

Why is my iPhone screen flashing on and off?

This is most commonly a software glitch or a problem with the auto-brightness sensor. Try a force restart and disable True Tone and Auto-Brightness. If that doesn’t work, it’s likely a hardware issue, especially if the phone was recently dropped.

Can a failing battery cause screen flashing?

Yes, a weak battery can cause voltage drops that lead to unexpected shutdowns and display flickering. If your iPhone also shuts down randomly or the battery health is below 80%, a battery replacement might fix the flashing.

Will a screen protector cause flashing?

No, a screen protector won’t cause flashing. It’s a passive layer of glass or plastic. However, a poorly installed protector might interfere with the proximity sensor, causing the screen to turn off unexpectedly during calls, but not flash.

How much does it cost to fix a flashing iPhone screen?

It depends on the cause. If it’s a software issue, it’s free to fix. If it’s a hardware issue, the cost varies by iPhone model and whether you have AppleCare+. Screen repair costs can range from about $129 to $329 for newer Pro models without AppleCare+. A loose cable repair might be cheaper at a third-party shop, but Apple doesn’t offer that as a standalone service.

Is it safe to keep using my iPhone if the screen is flashing?

It’s generally safe in the short term, but if the flashing is caused by a hardware failure, it could worsen. If the phone is overheating or the screen becomes unresponsive, stop using it. Back up your data and get it checked.

My iPhone screen flashes when I plug it in to charge. Why?

This could indicate a problem with the charging port or the battery. The flash might be the screen briefly losing power due to an unstable connection. Try a different cable and charger. If it persists, have the charging port inspected.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.