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How to Fix Lines or Dots on Your LG TV Screen: Causes, Checks &

Lines, dots, or marks on your LG TV screen may be caused by the broadcast signal or a connected cable. Set the aspect ratio to 16:9, and check the HDMI cable connection. You can also run Screen Self-Diagnosis to check whether the issue may be related to the TV.

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TroubleshootingTVs

What to Check First

  1. 1. Press the Settings button (gear icon) on the remote control.
  2. 2. Select All Settings from the quick menu.
  3. 3. Select Picture , then Aspect Ratio .
  4. 4. Select User Selection , then 16:9 .
  5. 1. Make sure the antenna cable is securely connected to the back of the TV.
  6. 2. Disconnect and securely reconnect the HDMI cable between the TV and the set-top box.
  7. 3. Try using a different HDMI cable to see if the original cable is faulty.
  8. 1. Press the Settings button on the remote control.
  9. 2. Select All Settings .
  10. 3. Select Support , then Screen Self-Diagnosis .

Why This Can Happen

Symptoms can have more than one cause, and the correct steps depend on the exact model, installation and operating conditions. Use the checks above to narrow the issue before service.

Safety and Model-Specific Guidance

Stop troubleshooting if you notice burning, electrical damage, unsafe heat, gas odor, refrigerant concerns, or water near electrical components. Follow the official LG USA instructions for your exact model.

Frequently Asked Questions

What should I check first for How to Fix Lines or Dots on Your LG TV Screen?

1. Press the Settings button (gear icon) on the remote control.

When should I stop troubleshooting and contact LG?

Stop if the product shows signs of electrical damage, burning, leaking near electrical components, or if the recommended checks do not resolve the issue. Use LG USA support for model-specific service guidance.

Does this guidance apply to every LG model?

Not always. Controls, error codes and service steps can differ by model. Confirm the exact model number and follow the linked LG USA article for model-specific instructions.

Related LG Products

These model pages are linked because the stored category or exact model matches this Help Library topic.

Buying Guides for This Product Type

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Read the Official LG Guide