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A television showing a blue, green, or black screen is most likely caused by a lack of signal. Make sure that your satellite or cable box is powered on and the television is set to the correct output by pressing ‘Input’ —> ‘Source’ —> ‘TV/Video’ on your remote control. Press the button to cycle through the input options until your TV gets a picture back. Also, be sure to check behind the TV for loose connections, and re-plug anything that is not connected properly. If your television is still not receiving a signal, reset the cable box by unplugging it and plugging it back in. There may be an issue with your signal or the box itself, so try switching the connections to another device. If the picture works with another device, contact your provider for service for the box itself.
If you are seeing an actor’s mouth move but are not hearing the audio in sync, go into your television’s or cable box’s audio settings and adjust the “audio delay” to get the video and audio back in sync.
If you are hearing an echo with your television’s audio system, you most likely have a separate sound system like a soundbar or surround sound system and the volume is playing through both the external sound system and your TV’s speakers. Disable or mute the audio for your TV speakers and use only your external sound system, which is likely much higher quality than the TV’s built-in speakers.
If your television picture is cutting out, breaking up, or pixelating (looks like the picture is made up of many squares), the television is probably experiencing a weak signal. Ensure that all connections are tight by checking all of the connections from the wall to your cable box and from the cable box to the television. If you continue to experience pixelation problems, you may need to contact your cable or satellite provider.