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A white line on an iPhone screen is a symptom, not a diagnosis. It may be caused by an app or iOS issue, a display connection or cable, a faulty screen, or a logic-board problem. Restart the iPhone and check whether the line appears in more than one app; if it remains on the Home Screen or across apps, arrange a professional inspection rather than relying on a reset to repair possible hardware damage.

What a white line can mean

The appearance of the line alone cannot identify the failed component. Possible causes include a temporary app or iOS problem, a loose or damaged display connection or cable, a faulty display, or a logic-board fault. A hardware problem can exist even when the glass has no obvious crack. iFixit’s troubleshooting guidance describes these possibilities, but determining which one applies requires diagnosis.

Note whether the line is vertical or horizontal, when it appears, and whether it started after an update, drop, liquid exposure, or repair. These details can help a technician, but they do not establish the cause.

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What to check before arranging service

  1. Check where the line appears. See whether it is confined to one app or also visible in other apps and on the Home Screen. A symptom limited to one app points to a different first check than a line visible throughout iOS.
  2. Restart the iPhone. A restart is a reasonable initial check for a temporary software issue.
  3. If it is app-specific, address the app. Close and update that app, then check again.
  4. If it appears in multiple apps or on the Home Screen, check for an iOS update. An update may help with a software issue, but it cannot be relied on to repair a damaged display or connection.
  5. Consider a recently installed accessory. If the line appeared after fitting a screen protector or adding another accessory, inspect for trapped debris or an optical artifact. iFixit suggests checking whether the line remains visible when the screen is off; this can help assess whether what you see may be an external visual effect.

Do not press, heat, bend, or open the phone to try to remove the line. The available guidance does not establish these as safe fixes.

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When a reset is unlikely to help

A factory reset is not a first-line fix when a line persists across apps or appears on the Home Screen. iFixit notes that resetting is unlikely to resolve the problem, although it may help rule out software as a cause. If you choose that diagnostic step, back up important data first. A reset should not substitute for inspection when the symptom suggests a display, connection, or board fault.

When to seek professional inspection

Arrange an inspection if the line persists after basic checks, began after impact, liquid exposure, or repair, or appears alongside flicker, touch failure, dark areas, or worsening display behavior. A technician can assess whether the problem is in the panel, its connection or cable, or the logic board. Back up important data before service.

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Choosing a repair route

The right option depends on your iPhone model, location, repair coverage, and experience. Apple says display repairs are best handled by trained technicians using genuine Apple parts. Its listed routes include Apple Stores and Apple Authorised Service Providers; depending on region and eligibility, an Apple Repair Centre, an Independent Repair Provider, or Self Service Repair may also be available. See Apple’s guidance on genuine iPhone displays and repair options for current details.

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Route Who it suits Coverage and considerations
Apple Store or Apple Authorised Service Provider People seeking service through Apple or an authorised provider. Apple identifies these as professional repair options using trained technicians. Availability depends on location.
Apple Repair Centre People whose region or service arrangement offers this route. Availability depends on location and the repair service offered.
Independent Repair Provider People considering an independent professional repairer. Availability varies. Apple states that independent-provider work is not covered by Apple’s warranty or AppleCare, though the provider may offer its own repair warranty.
Self Service Repair People experienced with complex electronics repair. Limited to specified models and regions. Apple provides eligible repair manuals and tools; model eligibility and procedure matter.

Do not assume that a procedure or part for one iPhone fits another. Apple’s iPhone 15 Repair Manual is a model-specific example; its troubleshooting, tools, parts, and repair steps should not be generalized to other iPhone models.

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Check display repair status after service

On iPhone 11 and later, except iPhone SE (2nd and 3rd generation), go to Settings > General > About and look for Parts and Service History. On supported models, it can show display repair status. Apple says an iPhone 15 or later running iOS 18 or later may show “Used” for a previously used display; a newly installed Apple display may show “Finish Repair” until Repair Assistant completes its procedure. These labels and features depend on model and software version.

Apple warns that non-genuine displays may affect touch response, color, brightness, sensors, or battery behavior. Ask the repair provider what parts and repair process will be used, and what coverage applies to the work.

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  • [Guide]: Remove the two screws at the bottom edge. Use the triangular pick to open the iphone. Don't insert pick over 3 mm, and don't insert your pick in left edge, as may damage internal components. Remove the screw securing the display connector bracket and disconnect the front sensor cable. Connect the new screen cable and please carefully align and press down on one side until it clicks into place. Do not press down on the middle. If the connector is misaligned, causing permanent damage.

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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