Samsung · Q9FN Series TV
The TV displays no content, distorted picture/sound, or a 'Weak or No Signal' message from an external device. Alternatively, the TV might not be able to find any broadcast channels.
Click steps to track your progress.
Ensure that all cables connecting to the external device are correctly and fully inserted.
Remove and reconnect all cables connected to both the TV and external devices. Try using new cables if possible.
Confirm that the correct input source has been selected on the TV (Settings > Source).
Perform a TV self-diagnosis (Settings > Support > Self Diagnosis > Start Picture Test or Start Sound Test) to check if the TV or the external device is causing the problem.
If the self-diagnosis tests are normal, reboot connected devices by unplugging each device's power cord and then plugging it in again.
If you are using an antenna or cable wall connector for TV signals, run Auto Program to search for channels (Settings > Broadcasting > Auto Program).