Fix Black Horizontal Lines on Smartphone Screen | Vijay Sales

Here are ways to fix black horizontal lines on your smartphone screen, including touch screen calibration methods, and highlights current models renowned for their display quality, so you know what optimal screen health looks like.

Common Causes of Black Horizontal Lines on Smartphone Screens

Some of the reasons the black horizontal lines appear on the smartphone screens are:

• Screen Hardware Issue: Faulty display panel or internal cracks

   

• Loose or Damaged Flex Cable or Connection: This happens between the motherboard and screen

   

• Software Glitches or Pixel Mapping Errors: This usually leads to horizontal artefacts

   

• Dead Pixels: This forms lines when clusters fail

   

• Touchscreen Malfunction: It is caused by moisture, pressure damage, or a faulty digitiser

Quick Checks to do Before You Start Fixing

Before you get into fixing the horizontal lines on the mobile screen, here is what you should do:

• Restart The Phone: A quick reboot can clear software weirdness.

   

• Safe Mode Boot: Holds off third-party apps. If the line disappears, suspect an app.

   

• Take A Screenshot: If the line is not in the screenshot, it indicates a display hardware issue.

   

• Gently Press the Edges: If the line shifts or flickers, it might be a loose connector or damage.

Software Fixes: Reset, Update, and Calibration:

Perform a Soft Reset: Force restart your phone. Mobile phones like the Samsung Galaxy S25 Ultra and Vivo V50 support long-pressing power + volume down until you see the logo. This can clear minor glitches.

Update Your Software: Go to Settings-System-Software update and install any available patches. Pixel drivers or display tweaks in updates could fix horizontal line issues.

Screen Calibration Apps: Though modern Android OEMs do not offer built-in calibration, third-party apps like “Display Test” or “Screen Colour Calibration” from the Play Store can help align pixel output and occasionally restore proper line display, especially useful for minor pixel row misalignments.

Calibrating via Developers

- Go to Settings-About Phone

- Tap Build Number seven times to unlock Developer options.

- In Developer options, toggle “Simulate colour space” or “Force GPU rendering” on and off. These changes can reset the rendering pipeline and sometimes remove ghost lines, although they are only a temporary solution for minor software alignment issues

When the Problem is the Hardware: Physical Damage and Loose Connections:

• Check for Physical Damage: Examine the screen under good lighting. Fine hairline cracks or bending may not be obvious, but can impact the internal layers.

   

• Reset Display Connectors: If you are tech-savvy, power off the phone. Remove the back panel (if it is not made of glass) and unscrew the components. Check the display flex cable. Ensure it is firmly in place. Be extremely careful, as it is not recommended unless you are experienced in this area.

   

• Temperature Treatment: For older LCDs, extremely brief exposure to a warm (not hot) environment, like inside a softly heated room, can sometimes realign stubborn pixels. Note: overheating risks further damage.

Replace the Display

If the damaged screen symptoms persist, check:

• Genuine Screen Replacement: Always insist on OEM panels. For devices like Samsung Galaxy S25 Ultra, Vivo V50 replacements through service centres ensure compatibility and warranty integrity.

   

• Cost Factors: High-end AMOLED screens (e.g., on Galaxy S25 Ultra) can be pricey. Mid-range LCD panels (like Vivo) are more affordable.

   

   

When to Seek Professional Help or Consider Screen Replacement

In the following scenarios, consider screen replacement or professional help:

- The line appears after a drop, bend, or water exposure.

- Restarting or factory resetting does not help.

- Safe mode does not remove the artefact.

- You are uncomfortable opening the device yourself.

In such cases, book an appointment with a certified service centre, like Vijay Sales. They provide walk-in support or arrange for OEM screen replacement.

Conclusion:

Black horizontal lines on your mobile screen can be unsettling, but there's no need to panic. Start with easy DIY screen fixes, such as restarting, updating, and testing screenshots, then escalate to calibration, hardware inspection, and ultimately, professional screen replacement if necessary. Knowing current top-tier models helps guide you in setting realistic screen performance expectations and determining replacement costs.

If the visual clarity you expect is no longer present, your next step is to undergo a quality repair to restore full-screen functionality.