Quick overview: Seeing vertical or horizontal lines on your Samsung Galaxy screen is alarming, especially when it affects touch and display quality. I recently encountered this issue on my Galaxy S21 in the UK and went through the full diagnostic and repair process. This guide explains the causes, possible fixes, and practical tips to get your screen looking normal again.

Primary keyword

Primary keyword: Samsung lines on screen UK

Step 1: Identify the type of lines

First, check whether the lines are vertical or horizontal:

  • Vertical lines: Often linked to hardware issues like a loose display connector or faulty digitizer.
  • Horizontal lines: Can be caused by software glitches, graphics driver issues, or partial hardware damage.

Human note: On my S21, vertical lines appeared after a minor drop — a clear sign of hardware stress rather than software.

Step 2: Restart the device

Software glitches sometimes create temporary lines:

  1. Press and hold Power + Volume Down for 10–15 seconds.
  2. Release when the Samsung logo appears.
  3. Observe if the lines persist.

Step 3: Boot into Safe Mode

Third-party apps may interfere with graphics rendering:

  1. Power off the phone.
  2. Hold Volume Down while powering on until “Safe Mode” appears.
  3. If lines disappear in Safe Mode, uninstall recently installed apps to identify the cause.

Step 4: Check for software updates

Samsung occasionally releases patches to fix display-related glitches:

  • Navigate: Settings → Software Update → Download and Install.
  • Restart the device after updating.

Step 5: Inspect hardware and screen connectors

Persistent lines often indicate hardware issues:

  • Loose or damaged display connectors can create vertical or horizontal lines.
  • Minor drops, bends, or pressure points can damage the OLED panel.
  • If your screen is cracked or has water damage, lines are more likely hardware-related.

Step 6: Professional repair options

  • Official Samsung service centres: OEM parts, warranty, and proper resealing for water resistance.
  • Independent repair shops: Often faster, sometimes cheaper; ensure OEM-quality screens to avoid colour or touch issues.
  • Mail-in services: Convenient if local options are unavailable; longer turnaround time.

Step 7: Tips & experience

  • Vertical lines usually indicate hardware faults; acting quickly can prevent further damage.
  • Horizontal lines occasionally disappear after soft resets or Safe Mode, so test software fixes before repairing.
  • Backup your device before any hardware intervention — technicians may replace the entire screen assembly.
  • Check reviews and ask if the repair shop uses OEM parts, especially for S-Series curved screens.

Internal links — AvNexo hubs for related guidance

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