If your Comcast service doesn’t work properly, you might want to consider calling Comcast technical support for help. They can assist you in troubleshooting cable signal problems, as well as help you fix the problem. Here are some simple ways to troubleshoot signal cable problems. First, remove the power cord from the cable box. Hold it for at least 30 seconds before plugging it back in. Reboot your computer if the problem persists. Check your picture quality.
Second, check the quality of your signal. A bad signal cable could cause a blank secondary TV. If the cable box has the same connection problem as your primary TV, it will read the check signal cable. If you think that the cable cables are secure and tight, they are. If you experience packet loss, it is likely that the problem is somewhere along the IP path. In that case, you’ll need to call Comcast tech support again.
Third, try rebooting your cable box. This is an easy but effective solution to the “no signal” problem. Most cable boxes have indicators lights on the sides. A green light means the device is ON, while a red light indicates an outage. If rebooting doesn’t work, you can also try disconnecting the box and reconnecting it to the wall with a circuit breaker. This will restart the device and hopefully fix the signal.