If you own a Samsung Galaxy S23 and recently updated to One UI 8.5, you may want to check your screen right now. Reports are flooding in from users across multiple platforms including Reddit, X, and Samsung's own community forums describing the appearance of permanent vertical green or pink lines on their displays shortly after installing the latest software update. The issue is not affecting a handful of people. The volume of complaints suggests something systemic is happening and Samsung has not yet made an official statement about it.

What Is Actually Happening

The green line issue is not new territory for Samsung. The company has dealt with variations of this display defect across multiple Galaxy S series devices over the past few years, typically linked to OLED panel degradation. What makes this wave unusual is the timing. Users are reporting that the lines appeared directly after installing One UI 8.5, which began rolling out in May 2026, even on devices that show no signs of physical damage. One user on X posted that their Galaxy S23 Ultra developed a vertical green line immediately after the update installed, with the phone having never been dropped or cracked.

The suspected mechanism is overheating. Installing a major software update is one of the most thermally intensive tasks a smartphone performs, generating significant heat while rewriting system files and recalibrating processes. For OLED displays that are already ageing or have marginal panel tolerances, that thermal stress during installation appears to be enough to trigger permanent display damage. Some users have reported their device becoming unusually hot during the update process, followed almost immediately by the appearance of the lines.


What Samsung Has and Has Not Done

Samsung has previously offered a one-time free display replacement for Galaxy S23 units affected by green line issues, but the policy comes with conditions. The phone must be within three years of purchase and must show no signs of physical damage. If the device qualifies, Samsung covers the screen itself but charges a labour fee. If the device is out of the eligibility window, users are being quoted screen replacement costs of around 19,500 Indian rupees, which translates to roughly 200 US dollars, an amount that stings particularly hard given that a software update appears to be the trigger.

Samsung has not officially commented on the One UI 8.5 connection or announced any specific remediation for this wave of complaints. Until they do, the practical advice for Galaxy S23 owners who have not yet installed the update is to hold off. If you have already updated and are not seeing any display issues, the risk has likely passed for your unit.

The Nigeria Angle

The Samsung Galaxy S23 series has been widely available in Nigeria through authorised distributors and grey market importers and remains a popular choice at its current resale price point. Nigerian users who bought the device within the past two years and are seeing green line issues should contact Samsung's authorised service centres and specifically reference the One UI 8.5 update as the trigger when making their complaint. Documenting the timeline clearly, showing that the lines appeared after the update rather than after physical damage, is the most important thing you can do to support a warranty or goodwill replacement claim.