A black dot or line on your iPhone screen almost always means physical damage to the display, not a software glitch. If it showed up after a drop, a squeeze in your pocket or a splash of water, the screen layers underneath are damaged and a screen replacement is usually the fix. There are a few exceptions, like a speck of dust under your screen protector or a swollen battery, and we’ll cover those below so you know what you’re dealing with before you spend a cent.
Here’s a 10 second test to start. Take a screenshot. If the dot or line doesn’t appear in the screenshot, the problem is in the screen hardware, not in iOS. If it does appear in the screenshot, restart the phone and update iOS first, because that points to software.
Black Dot vs Dead Pixel: Not the Same Thing
People search “black dot on screen” and “black dot on iPhone screen” and usually land on dead pixel advice. Sometimes that’s right. Often it isn’t.
A dead pixel is tiny. It’s one single point of light that has stopped working, and it stays exactly the same size. It’s usually there from day one or shows up slowly with age.
A black spot is different. It’s bigger, often has soft or uneven edges, and tends to grow over a few days or weeks. This usually happens when something presses hard on the screen, like a phone in a tight back pocket or a heavy bag, or when the phone takes a knock. The pressure damages the liquid crystal layer inside an LCD screen, and the dark patch spreads from there.
A quick way to tell them apart: open a plain white screen and look closely.
- Same size every time you check: probably a dead or stuck pixel.
- Fuzzy edges or getting bigger: damage inside the screen, and it won’t heal on its own.
- Looks like a speck that you can see sitting on top of the glass: wipe the screen, then peel back the screen protector. Dust and tiny bubbles trapped underneath fool a lot of people.
What Causes Lines Across the Screen
If you have iPhone 11 black lines on the screen, or lines on any phone, the pattern tells you a lot. Thin horizontal or vertical lines, thick black bars, or a flickering band across the display are almost always one of these:
- Impact damage. A drop can crack the layers inside the display without leaving a mark on the glass. The screen looks perfect from the outside and still shows lines.
- A loose or damaged display cable. The screen connects to the logic board through a thin flex cable. If it gets knocked loose or bent, you’ll often see lines that come and go, or change when you press near the edge of the screen.
- Liquid damage. Moisture can corrode connections inside the phone. Lines sometimes show up days after the phone got wet, once the corrosion has set in.
- A failing display driver or board issue. Less common, but it happens, especially on phones that have been repaired before or have had heat or water exposure.
Colour matters too. Black lines usually point to the display itself. Green, pink or purple lines point more toward a cable or board problem. Either way, lines that appear after a drop and don’t go away after a restart are almost never software.
Can This Be Fixed, or Does the Whole Screen Need Replacing?
It depends on the cause, and here’s the honest breakdown:
- Dust or a bad screen protector: Free fix. Clean the screen and swap the protector.
- A software glitch: Force restart the phone and update iOS. If the line is gone, you’re done.
- A growing black spot or permanent lines: The screen needs replacing. There’s no way to repair a damaged LCD layer, so a new display is the fix.
- A loose cable: Sometimes a technician can reseat or replace the cable without changing the whole screen. This needs a proper diagnosis.
Before any repair, back up your phone to iCloud or your computer. Screen replacements don’t normally touch your data, but a backup takes the worry out of it.
If it does need a new screen, The Mobile Hub uses genuine parts, covers every repair with a 3 month warranty, and takes walk-ins at all four locations (Annerley, West End, Kelvin Grove and Gladstone). Check the Prices List for current screen replacement pricing, see our iPhone repair page, or book an appointment and we’ll diagnose it before you commit to anything.
When It’s a Battery-Swelling Warning Sign, Not a Screen Issue
This one catches people out. A swollen battery can push the display up from underneath, and that pressure can cause dark patches or lines that look exactly like screen damage. Replacing the screen won’t fix it, and it’s a safety problem, not just a cosmetic one.
Check for these signs:
- A small gap between the screen and the phone’s frame, especially along the edges
- The screen looking slightly raised or lifting at a corner
- The back of the phone bulging, or the phone rocking when you put it flat on a table
- The phone running hotter than usual or the battery draining unusually fast
If any of that sounds familiar, stop charging the phone, don’t press on the screen, and keep it away from heat. Get it checked as soon as you can. A swollen battery needs replacing, and it shouldn’t be left in a bag or on a charger overnight.
FAQs
Is a black dot on my iPhone screen the same as a dead pixel?
Not usually. A dead pixel is a tiny, fixed point that never changes size. A black dot or spot is larger, often has blurry edges, and tends to spread. The spot comes from pressure or impact damage inside the screen, so it’s a different defect with a different fix.
Will a black dot on my screen go away by itself?
A stuck pixel sometimes recovers. A black spot caused by pressure or impact damage will not, and it often grows. If yours is spreading, book a diagnosis sooner rather than later.
Can iPhone 11 black lines on the screen be a software problem?
Rarely. Do the screenshot test first. If the lines appear in the screenshot, restart your phone and update iOS. If they don’t appear in the screenshot, it’s a hardware fault in the screen or its connection.
Can I keep using my phone with lines or black spots on the screen?
You can, but the damage often gets worse over time, and lines can eventually take over a larger part of the display. The exception is a swollen battery. If you see any signs of swelling, stop using and charging the phone and get it checked.
Does phone insurance cover black lines or spots on the screen?
It depends on your policy and on how the damage happened. Accidental damage is often covered, but check your policy before you book a repair. The Mobile Hub also offers insurance reporting if you need a damage report for a claim.
How is this different from a dead pixel?
Size and behaviour. A dead pixel is a single, tiny point that stays the same. A black dot or spot is bigger and can spread, and lines run across the screen.
The quick version:
- A screenshot test tells you fast whether the problem is software or hardware.
- A small, fixed dot is likely a dead pixel. A bigger spot that grows is internal screen damage.
- Lines after a drop, a squeeze or water exposure almost always mean the display needs replacing.
- Dust under a screen protector and a swollen battery are the two look-alikes worth ruling out.
- Not sure which one you have? Bring it in or book an appointment and we’ll tell you before you pay for anything.