Try the following

Check other sources or perform picture test to confirm picture quality

How to perform picture test

• Android TV™ or Google TV™ models: Refer to the How can I test the picture and sound quality of my Television? article.

• Other than Android TVs or Google TVs: Follow these steps. If the steps are not applicable, refer to your product Manual for instructions.
  1. On the remote control, press the HOME button.
  2. Select Customer Support under System Settings.
  3. Select View Test Picture under Picture Check.

If the image quality is good

There is no issue with the TV. The issue is occurring most likely because of the quality of the content or connectivity.
You may try to improve the image quality by adjusting the Picture mode, Sharpness, and Resolution settings. 

Notes on content quality or connectivity
If your TV is high definition, request a high-definition cable or satellite set-top box from your service provider. For best picture quality, set your cable or satellite set-top box to 1080i fixed. The type of connection from your set-top box determines the quality of the picture. For best picture quality, request a set-top box with an HDMI connection. The second best choice is Component video.

The broadcaster controls the quality of the program. Some programs are broadcast in high definition (HD), while other programs are broadcast in standard definition (SD), even on HD stations. SD content on HD channels does not create an HD picture. The quality of the picture also depends on the type of camera used when the original recording was made.

If the image quality is NOT good

Adjust the picture settings such as Picture mode, Sharpness and Resolution to see if situation improves.

Is the issue resolved?

No, take me to the next step.

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