Sony SupportKDL-40BX420

Article ID : 00023612 / Last Modified : 10/16/2019

No picture or TV displays a NO SIGNAL message

    There are a variety of reasons your TV doesn't display a picture or receive a signal. The most common reasons are listed below:

    IMPORTANT: Check if your TV operates normally after completing each step. Refer to the supplied manual for model-specific information.

    1. Your TV may not display a picture if the indicator LED is blinking. 
    2. An Audio/Video source device may not be connected properly:
    3. Rescan the active channels if your TV is using direct cable or an over-the-air antenna.
      • During the TV service initial setup step, select the built-in tuner.
      • Skip this step if you are using a cable box or satellite receiver.
    4. Make sure your TV input is set to a connected device. Refer to the following:
    5. If you are using a satellite receiver, or other set-top box, your TV must be set to the base channel, which is Channel 3 or 4. After your TV displays a signal, use the remote control of the connected device to change the programs.
    6. The connected device may be turned off or in standby mode. Turn the device on.
    7. The selected channel may not be live or the media playing may be blank. Change the channel or try a different input device or movie.
    8. The received signal may be weak.
      • If your TV uses an over-the-air antenna, you may need to adjust the antenna to improve the signal quality.
      • If your TV uses a cable or satellite box, you may need to contact your service provider for further assistance in improving the signal strength.
      • An optional distribution amplifier may help improve a weak signal. Visit your local electronics retailer for more information or to purchase a distribution amplifier.

    The steps above should resolve the issue. If the problems persist, repair may be required. Go to Product Repair.