First, press INFO on your remote control. You may be able to quickly resolve some signal issues. If you see a banner showing a program title and description at the top of the screen:
If your TV picture is frozen or displays wavy lines or overlapping images, check your receiver connections.
If you're seeing a black, blue, or gray screen, or a No Signal message without the DIRECTV logo, try these quick fixes.
Check your TV Input
Check cables between receiver and TV
Over time cables may become unplugged or changed when someone in the household switches to a gaming system or other device.
Make sure the cable connecting your TV to the satellite receiver isn’t unplugged.
Tip: HDMI is the most common cable type but there are other types depending on your setup.
Reset your receiver
Press the red reset button which is located on the side of most DIRECTV receivers or inside the access card door on the front panel. Wait for your receiver to reboot.
If your receiver doesn’t have a red reset button: