iPhone Screen Test

What is an iPhone Screen Test?

An iPhone screen test is a diagnostic procedure that displays solid colors on your iPhone display to reveal defective pixels. A dead pixel appears as a tiny black dot that never lights up, while a stuck pixel stays on a single color. On OLED iPhones (X and later), the test also reveals burn-in — permanent ghost images caused by uneven pixel aging.

Our free online iPhone screen test cycles through pure white, black, red, green, and blue screens in fullscreen mode. It works on iPhone 15, 14, 13, 12, SE, and older models — in Safari or Chrome, with no downloads or signups.

Why iPhone Screen Testing Matters

iPhone displays are among the best in the industry — but they're not immune to defects. Here's why testing matters:

• Expensive to replace — iPhone screen repairs cost $200–$400+
• AppleCare limits — Apple won't replace a screen for 1–2 dead pixels
• OLED burn-in risk — iPhone X and later use OLED, which can develop burn-in
• Used iPhone purchases — Always test a used iPhone before buying
• Documentation — Test results help with warranty claims

How the iPhone Screen Test Works

Our test uses the same industry-standard test patterns trusted by display manufacturers and calibration professionals. It cycles through:

• Pure white — Reveals dead pixels (black dots) and dust
• Pure black — Reveals stuck pixels (bright dots) and backlight bleed
• Red, green, blue — Reveals sub-pixel defects and color anomalies
• Grey (50%) — Reveals burn-in and image retention on OLED

💡 Pro tip: Before testing, set your iPhone brightness to maximum (Control Center → Brightness slider) and disable True Tone and Night Shift for the most accurate results.

What Does This Test Detect?

Our iPhone screen test is designed to detect six distinct types of screen defects. Here is exactly what you should look for:

1. Dead Pixels (Black Dots)

A dead pixel is a pixel that has completely stopped working. It appears as a tiny black dot that stays black on every background — including a full white screen. Dead pixels are permanent hardware failures and cannot be fixed.

2. Stuck Pixels (Bright Colored Dots)

A stuck pixel remains on a single color — red, green, blue, or white. Unlike dead pixels, stuck pixels still receive power, which means they can often be fixed using rapid color cycling or gentle pressure.

3. Partially Stuck Sub-Pixels

Each pixel contains three sub-pixels (red, green, blue). Sometimes only one or two sub-pixels fail, creating colors like cyan, magenta, yellow, or dimly colored dots. These are harder to spot but still detectable with our test.

4. OLED Burn-In (iPhone X and Later)

iPhones with OLED displays (X, 11 Pro, 12, 13, 14, 15 series) can develop burn-in — permanent ghost images from static content like the status bar, keyboard, or navigation elements. Our grey test pattern reveals burn-in clearly.

5. Image Retention (Temporary Ghosting)

Unlike true burn-in, image retention is temporary. It fades after a few minutes or hours of normal use. Our test helps distinguish between the two — a critical difference for warranty claims.

6. Uniformity Issues (Clouding & Color Shift)

Our solid-color screens reveal clouding (blotchy patches) and color tinting (yellow, blue, or pink areas). These issues are common on older iPhones or after drops.

💡 Pro tip: Test in a dark room with your iPhone at maximum brightness and True Tone disabled. This makes subtle defects much easier to spot.

What the Results Mean: A Complete Interpretation Guide

You've run the test. Now you see something on your iPhone screen. But what exactly is it, and how serious is it? Here's how to interpret what you found:

How to Confirm What You Have

The easiest way to confirm the nature of the defect is to check the dot on every color:

• Stays black on ALL colors → Dead pixel
• Disappears on ONE specific color → Stuck pixel (that color's sub-pixel is stuck ON)
• Bright on dark backgrounds only → Likely a stuck white pixel
• Ghost image fades after 1 hour off → Image retention, not burn-in
• Ghost image persists after 1 hour off → True burn-in (OLED)

What to Do Next Based on Your Result

• Dead pixel → Return within return window (14 days) or contact Apple
• Stuck pixel → Try our 5 proven fix methods
• Burn-in → Check Apple warranty — OLED burn-in is covered on newer models
• Clouding or color shift → Return within window if severe
• Ghosting → Not fixable — inherent to the display technology

💡 Important: If you see multiple defects, take clear photos of each one. Apple usually requires documented evidence for warranty claims — especially for burn-in.

Common iPhone Screen Problems (And How to Fix Them)

After testing thousands of iPhones, we've identified the most common issues users face. Here are the top 6 problems — and exactly how to solve them:

Problem 1: One or More Dead Pixels

Symptom: Black dots that never light up, visible on every color.

Cause: Hardware failure (transistor burned out).

Solution: Dead pixels cannot be fixed. Return the iPhone within the 14-day window, or file an AppleCare claim if you have coverage.

Problem 2: Stuck Pixels (Bright Colored Dots)

Symptom: Bright red, green, blue, or white dots that stay on one color.

Cause: Liquid crystals frozen in one position.

Solution: Try our 5 proven fix methods — software cycling, gentle pressure, tapping, heat, or waiting it out.

Problem 3: OLED Burn-In (iPhone X and Later)

Symptom: Ghost image of the status bar, keyboard, or navigation elements visible on grey backgrounds.

Cause: OLED pixels age unevenly when static content is displayed for long periods.

Solution: Reduce brightness, enable auto-brightness, use dark mode, and avoid long periods of static content. Apple covers burn-in under warranty on newer models — check your coverage.

Problem 4: Image Retention (Temporary Ghosting)

Symptom: Faint ghost image that fades after a few minutes or hours.

Cause: Temporary pixel fatigue, not permanent damage.

Solution: Turn off your iPhone for an hour and check again. If it fades, it's image retention — no action needed.

Problem 5: Color Tinting

Symptom: Yellow, blue, or pink tint visible across the screen.

Cause: True Tone, Night Shift, or panel damage.

Solution: First, disable True Tone and Night Shift in Settings → Display & Brightness. If the tint persists, it's a panel issue — contact Apple.

Problem 6: Ghosting & Motion Blur

Symptom: Trailing blur behind moving objects.

Cause: Slow OLED response time (rare on iPhone).

Solution: This is inherent to the panel technology — not fixable. Contact Apple if it's severe and under warranty.

💡 Pro tip: Before contacting Apple for a screen issue, test twice — once in a dark room, once in ambient light. Take screenshots of each defect.

How to Test Your iPhone Screen

1. Clean your screen — Remove dust and fingerprints with a microfiber cloth.
2. Set brightness to maximum — In Control Center, drag the brightness slider to max.
3. Disable True Tone and Night Shift — Settings → Display & Brightness.
4. Open this page on your iPhone — The test works in Safari or Chrome.
5. Tap "Start Full Diagnosis" — The test runs in fullscreen mode.
6. Inspect each color — White, black, red, green, and blue.
7. Document any defects — Take screenshots for AppleCare claims.

Compatible iPhone Models

Our iPhone screen test works on every iPhone with a modern browser — from the original SE to the latest iPhone 15 Pro Max.

Fully Supported Models

Browser Compatibility

Our iPhone screen test runs on:

• Safari — iOS 15 and later
• Chrome — iOS 15 and later
• Firefox — iOS 15 and later
• Edge — iOS 15 and later

💡 Pro tip: For the most accurate test on your iPhone, disable auto-brightness in Settings → Accessibility → Display & Text Size, and set your brightness to 100% before running the test.

When Should You Run an iPhone Screen Test?

Timing matters. The best moment to test your iPhone screen is before it's too late — meaning before the return window closes or the warranty expires.

✅ Run This Test Immediately After Buying

Whether you just bought a new iPhone or a used one, test it within the first 24 hours. Here's why:

• Return windows are short — 14 days for Apple, 30 days for some carriers
• Defects are easier to return than repair — Apple Store exchange is instant
• AppleCare limits — 1–2 dead pixels rarely qualify for a screen replacement
• Used iPhones can hide defects — Sellers don't always disclose them

✅ Run This Test When Buying Used

If you're buying a second-hand iPhone on eBay, Swappa, or Facebook Marketplace, always test it before paying. Open screenmedic.icu/devices/iphone.php on the device and run the test in person.

Common issues on used iPhones:

• Hidden dead pixels
• OLED burn-in (especially on older models)
• Color tint from a replaced screen
• Physical damage to the panel

✅ Run This Test After a Drop or Impact

iPhones are durable, but drops can damage the display. If your iPhone has recently been dropped, run the test immediately. Physical impacts can cause new dead pixels or uniformity issues.

✅ Run This Test Monthly (Preventive)

Even if your iPhone was perfect at purchase, defects can develop over time. Run a quick test once a month to catch any issues early — especially if you use your iPhone heavily or leave the screen on for long periods.

✅ Run This Test Before Selling Your iPhone

If you're selling your iPhone, running the test helps you:

• Document the current condition — Protects you from buyer disputes
• Prove it works — Increases buyer confidence
• Justify your price — Clean test results = higher resale value

💡 Pro tip: Bookmark this page. You'll want to come back every time you buy, sell, or drop your iPhone.

Related Tests You Should Run

If you're testing an iPhone, here are the other tests you should run to get a complete picture of your device's health:

Frequently Asked Questions

Is this iPhone screen test really free?

Yes, absolutely. No hidden fees, no premium tiers, no account required. The test runs entirely in your browser and costs nothing.

Does this test work on iPhone 15 Pro Max?

Yes. Our test works on every iPhone model — from the original SE to the latest iPhone 15 Pro Max. Just open this page in Safari or Chrome on your iPhone.

Will the test damage my iPhone screen?

No. The test simply displays solid colors on your screen. It does not stress your hardware, does not overheat your panel, and does not cause burn-in. It's completely safe.

Can this test fix dead pixels?

No. Dead pixels are permanent hardware failures and cannot be fixed. However, stuck pixels can sometimes be fixed using our rapid color cycling feature. Read our Stuck Pixel Fix Guide for the full method.

How long does the iPhone screen test take?

Under 60 seconds. The full diagnostic cycles through 5 solid colors — white, black, red, green, and blue — in about 45-60 seconds.

Do I need to download an app?

No. The test runs entirely in Safari or Chrome on your iPhone. No downloads, no App Store, no signups.

Does it work on iPads too?

Yes. Our test works on iPhone and iPad. The test runs the same way on any Apple device with a modern browser.

Is my data collected?

No. Everything runs locally in your browser. We do not collect, store, or transmit any personal data, screen contents, or diagnostic results.

What should I do if I find a dead pixel on my iPhone?

If you're within Apple's 14-day return window, return the iPhone to an Apple Store or your carrier. If you're past the return window, contact Apple Support — AppleCare may cover it if you have 3+ dead pixels. Read our Complete Dead Pixel Guide for more details.

Does Apple cover OLED burn-in under warranty?

Yes, on most newer iPhone models. Apple considers OLED burn-in a defect covered by the standard 1-year warranty and AppleCare+. Document the burn-in with photos before contacting support.

Can I test a used iPhone before buying it?

Yes — this is one of the best use cases. Bring the iPhone to a quiet spot, open screenmedic.icu/devices/iphone.php in Safari, and run the test in person. It takes less than a minute and can save you from buying a defective device.

Does the test work on iPhone XR or SE (LCD models)?

Yes. Our test works on both OLED and LCD iPhones. On LCD models (XR, SE, 11), you won't see burn-in — but you can still detect dead pixels, stuck pixels, and uniformity issues.

Related Guides You Should Read

Want to go deeper? These expert guides will help you understand your iPhone screen and solve any issue: