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Fix a Chromebook display that has lines

We'll rule out software and cable, then isolate the cause—loose cable, panel damage, or display hardware—or tell you when to call a pro.

Troubleshooting · Home maintenance
10–30 min
What you'll need
  • External monitor and cable (to test)
  • Screwdriver set (if reseating cable)
Step 1 of 5

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Steps

Goal: Rule out software and cable, then isolate panel or display hardware.

  • Connect an external monitor. If it has no lines, the internal display or cable is the issue.
  • Good: You have isolated the cause. Proceed to Try external monitor.
  • Bad: If both have lines, update ChromeOS and try Powerwash.

Try external monitor

Goal: Determine whether the Chromebook outputs a clean image.

  • Connect an external monitor via HDMI or USB-C. Check if it has lines.
  • If the external is clean, the internal display cable or panel has failed. If the lines change with lid angle, the cable is likely loose.
  • Good: Cause isolated. Reseat the cable if comfortable, or call a technician.
  • Bad: Both have lines—update ChromeOS and Powerwash.

Update ChromeOS

Goal: Rule out software-related artifacts.

  • Settings > About Chrome OS > Check for updates. Install and restart. Try Powerwash (Settings > Advanced > Reset settings) if updates do not help. Boot in Guest mode to test without extensions.
  • Good: Lines gone after update or Powerwash—software or extension conflict. Remove extensions or keep the update.
  • Bad: Lines persist—display hardware may have failed. Call a technician.

When to get help

Call a technician if:

  • The external monitor is clean but the internal has lines.
  • You are not comfortable opening the Chromebook to reseat the cable.
  • The panel has physical damage—replacement needed.

Verification

  • The screen displays without lines.
  • External monitor test confirms whether the internal display or cable is at fault.
  • Cable reseated or panel replaced if that was the fix.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. External monitor test Connect external—if clean, internal cable or panel failed.
  2. Update ChromeOS Check for updates; Powerwash if needed.
  3. Reseat cable (if comfortable) Open Chromebook and reseat display cable at both ends.
  4. Call a pro Panel damage or cable reseat failed—technician needed.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Whether external monitor has lines
  • Whether lines change with lid angle
  • Chromebook model
  • Steps already tried

Does the external monitor have lines?

If external is clean, the internal display or cable is the issue.

Connect external monitor via HDMI or USB-C. External clean: internal cable or panel—reseat cable or call technician. External has lines: ChromeOS glitch—update or Powerwash.

Yes No

You can change your answer later.

Do the lines change when you move the lid or apply light pressure?

Changing lines often indicate a loose cable.

Gently flex the lid. Lines change: loose cable—reseat if comfortable, or call technician. Lines fixed: panel damage—call technician for replacement.

Yes No

You can change your answer later.

Update ChromeOS and Powerwash

Settings > About Chrome OS > Check for updates. Powerwash from Settings > Advanced > Reset settings. If lines disappear after Powerwash, software conflict. If lines persist, display hardware may have failed—call a technician.

Done

Reseat display cable

Open Chromebook per model guide. Unplug and replug display cable at motherboard and panel. Only if comfortable with disassembly. If not, call a technician.

Done

Call a technician

Internal display has lines, external is clean. Cable reseat or panel replacement needed. Opening the Chromebook requires a professional.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a Chromebook display have lines?
Loose display cable, damaged panel, or ChromeOS glitch. Test with external monitor first. Lines that change with lid angle often mean a loose cable.
Can I fix Chromebook display lines myself?
You can try updating ChromeOS and Powerwash. Reseating the display cable requires opening the Chromebook—only if comfortable. Panel damage needs replacement—call a technician.
When should I call a technician for display lines?
If the external monitor has no lines but the internal does—the cable or panel is at fault. Reseating the cable or replacing the panel requires opening the Chromebook.

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