TVs

TV has lines running across the screen

Vertical or horizontal lines almost always point to a damaged panel or loose ribbon cable rather than something fixable in settings. A recent bump or drop is the most common trigger.

Difficulty
Professional only
Time
10–20 minutes to diagnose
DIY cost
$0
Pro cost
$150–$400

Symptoms

  • Thin colored or dark lines run top to bottom or side to side
  • Lines appear on every input and channel
  • Lines shift or multiply over time
  • Started right after moving or bumping the TV

Likely causes

  • CommonDamaged or cracked display panelPhysical stress from a drop or pressure can crack the panel's internal layers, showing as fixed lines.
  • CommonLoose T-con board ribbon cableThe timing controller board connects to the panel with ribbon cables that can shake loose.
  • PossibleFailing T-con board itselfA worn timing board can cause repeating patterns of lines that shift over time.
  • Less commonBad HDMI cable or portOnly relevant if lines appear on just one input; a source-side cable issue can look like noisy lines.

What to do

  1. Check if the lines appear on every input and on the TV's own menu screen, not just one source.
  2. If lines only show on one HDMI input, swap that cable and try a different port.
  3. Gently press along the TV's edges (TV off) to see if a loose internal connection is worth having reseated, without pressing on the screen itself.
  4. Power cycle the TV by unplugging for a full minute.
  5. Take a photo of the line pattern to show a technician; it helps them diagnose panel versus board issues quickly.
  6. If the TV is out of warranty and older than 6–7 years, weigh repair cost against replacement.

Tools and parts

T-con boardSearch: “TV T-con board replacement for model”

When to call a pro

Lines that appear on every input almost always need a TV repair technician; a cracked panel usually isn't worth repairing on an older set.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.