Understanding the Green Line Issue on Phone Screens

Have you ever noticed an irksome thin green line marring your smartphone screen? If so, you’re not alone. Many smartphone users, especially those with AMOLED displays, have encountered this frustrating problem. In this article, we delve into the green line issue: what it is, what triggers it, how to prevent it, how to potentially resolve it, and whether warranty coverage applies.

What is the Green Line Issue?

The green line issue manifests as a display defect, causing either a vertical or horizontal green line to snake across your smartphone screen. This line may be persistent or intermittent, affecting a section or the entirety of the screen. Its position, width, or brightness can fluctuate, contingent upon screen content or device orientation.

Green Line issue

The green line problem was initially observed in 2017 when users of devices like the Samsung Galaxy S7 Edge and iPhone X reported the presence of a green line. Since then, it has plagued numerous smartphones equipped with AMOLED displays, including the Samsung Galaxy S8, S9, S10, Note 8, Note 9, Note 10, OnePlus 6T, OnePlus 7 Pro, OnePlue 8, OnePlus 8 Pro, Google Pixel 3 XL, Huawei Mate 20 Pro, and Xiaomi Mi 9.

Causes of the Green Line Issue

The green line issue stems from hardware glitches within the smartphone’s display assembly. This assembly comprises multiple layers: the glass panel, touch screen, OLED panel, and display connector. The OLED panel, consisting of millions of pixels that emit different colors, has three subpixels: red, green, and blue. The display connector’s role is to transmit signals from the motherboard to the OLED panel.

The green line issue surfaces due to one or more of the following issues:

Loose or Damaged Display Connector

Physical stress, such as drops or bending, can loosen or damage the display connector, disrupting signal transmission between the motherboard and the OLED panel.

OLED Panel Damage

Water damage or overheating can cause certain subpixels to malfunction or fail, with green subpixels being more susceptible.

Software Updates

Alterations in voltage or frequency settings of the OLED panel, possibly induced by software updates, may lead to overactive or underactive subpixels.

AMOLED displays are particularly susceptible due to pixel degradation, a challenge not as prevalent in LCD displays. AMOLED screens contain organic materials that degrade over time, while LCD screens feature more resilient liquid crystals. Nonetheless, AMOLED displays offer several advantages, including higher contrast ratios, lower power consumption, slimmer profiles, and superior viewing angles.

How to Prevent the Green Line Issue

Shielding your smartphone from physical harm and exposure to water is the most effective way to stave off the green line issue. Here are some tips for safeguarding your device:

Green Line issue
  • Use a Protective Case and Screen Protector: Employing both safeguards helps mitigate the impact of accidental drops and bumps.
  • Avoid Storing with Hard Objects: Keep your phone separate from hard objects like keys or coins to prevent scratches and dents.
  • Temperature and Humidity: Shield your phone from extreme temperatures and humidity to prevent overheating or condensation.
  • Use While Charging: Avoid using your phone while it’s charging to prevent overheating and overcharging.
  • Compatible Chargers and Cables: Stick to compatible chargers and cables to steer clear of voltage fluctuations and short circuits.

Regularly updating your phone’s software is another way to deter the green line issue. This ensures optimal display settings and performance. Check for software updates via Settings > System > System update on your phone.

The Impact of Software Updates

Some OnePlus 8 users have reported that the green line issue appeared immediately after updating their phone to OxygenOS 13 based on Android 13. This raises the question of why a software update can cause a display defect.

While the answers aren’t crystal clear, a few plausible explanations emerge:

Voltage and Frequency Tweaks

It’s conceivable that the software update tweaked the voltage or frequency settings of the OLED panel, causing some subpixels to act erratically. Green subpixels, being more susceptible, might manifest as a green line on the screen.

Bugs or Compatibility Quirks

Another theory is that the software update introduced a glitch or compatibility hiccup affecting the display driver or connector. This disruption could impede the signal flow between the motherboard and the OLED panel, giving rise to the green line issue.

However, these hypotheses lack conclusive evidence, and additional variables may be at play. The manifestation of the green line problem might hinge on individual devices. Notably, not all OnePlus 8 users encountered this issue following the OxygenOS 13 update. Some users reported resolving it by reverting to OxygenOS 12.1, based on Android 12, while others found the problem persisted even after downgrading or factory resetting their phones.

Therefore, pinpointing the precise cause of the green line problem and its relationship with software updates remains elusive. To rectify the issue, the most advisable course of action is to reach out to OnePlus customer support and request a professional repair service. Their experts will scrutinize your phone, assessing the nature and extent of the damage, and subsequently either repair or replace your device.

How to Fix the Green Line Issue

For those already grappling with the green line issue, several possible remedies exist. However, these solutions are not universal, and they may only provide temporary relief. A definitive and permanent fix necessitates the replacement of the display assembly and potentially the motherboard of your device.

Temporary Fixes

  • Restart Your Phone: Initiate a restart to potentially resolve temporary software issues. Press and hold the power button, select Restart, and await your phone’s reboot.
  • Remove Recently Used Applications: If you’ve recently installed or used certain applications before encountering the green line, consider uninstalling or closing them. These apps might be incompatible or malfunctioning, contributing to the green line.
Green Line issue

Permanent Fixes

  • Contact Customer Support for Repair: If your device remains under warranty, reach out to the manufacturer or seller to request a repair service. Professionals will diagnose the issue and determine the necessary remediation. They may repair or replace your device.
  • Replace Display Assembly and Possibly Motherboard: For those outside warranty coverage or inclined to self-repair, procuring a new display assembly and potentially a motherboard is an option. The process, however, requires specific tools (e.g., screwdriver, spudger, suction cup, heat gun) and adherence to a step-by-step guide for disassembly and reassembly. Note that this approach carries risks and complexities, potentially voiding your warranty or exacerbating device damage. It’s advisable only if you possess confidence and experience in smartphone repairs.

Is the Green Line Issue Covered Under Warranty?

Warranty coverage for the green line issue hinges on the manufacturer’s or seller’s specific warranty policies. Coverage may or may not apply, dependent on various factors, including the cause and extent of the damage, as well as the terms and duration of the warranty.

Generally, most manufacturers or sellers extend warranty coverage for the green line issue if it arises from manufacturing defects or software updates. However, they typically do not cover damage attributable to physical or water damage. Additionally, diagnostic fees, shipping fees, or replacement part charges may apply.

To ascertain warranty coverage for your device, consult the warranty card or receipt provided with your purchase. Alternatively, visit the manufacturer’s or seller’s website and input your phone’s serial number or IMEI number to access information on warranty status, eligibility, and expiration.


The green line issue afflicting smartphone screens is a frustrating display defect encountered in many devices featuring AMOLED displays. It results from hardware defects within the display assembly or motherboard of your smartphone. Prevention involves responsible smartphone care and up-to-date software. When the green line issue does occur, it may necessitate a range of remedies, from customer support assistance to advanced self-repair options. Warranty coverage’s applicability varies based on the manufacturer’s or seller’s policies.

We trust this article has provided you with a comprehensive understanding of the smartphone green line issue. For further questions or insights regarding this problem, please don’t hesitate to share them below. Thank you for reading!

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