Channel 320, 323 tilling. Cannot correct with reset or restart.

Channel series 300 are tilling. Tried correcting with restart and reset ...

Pixelation (tiling) happens when the signal for the channel you are trying to watch is too weak or has too much noise. This is most likely due to a poor connection between in-home equipment and Comcast's network, usually in or near your home. It might also be because of a bad cable box or a problem at Comcast (check https://www.xfinity.com/support/status, 1-800-Comcast voice response, or the "Xfinity" app) but those possibilities are much less likely.

Troubleshoot by checking all connectors for corrosion and tightness, and by looking for damaged coax cable. Running the cable through a surge protector, a defective splitter, or too many splitters can cause signal problems as well. If there is an amplifier in the line make sure it's getting power. You might also try unplugging the cable box/DVR/digital adapter power cord for a minute or so.

If you can't find the problem or you'd rather have Comcast take care of it and an employee does not respond to your message here, call them at the phone number on your bill or 1-800-Comcast, or use one of the options on https://www.xfinity.com/support/contact-us/. Ask them to check the account setup and send a refresh signal to the box. If they can't fix the problem remotely, insist they send a tech out to identify the cause and correct it.

If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit (approx. $100) unless you have their Service Protection Plan (https://www.xfinity.com/support/articles/service-protection-plan, closed to customers that don't already have it). If the trouble is due to a faulty Comcast cable box/DVR/digital adapter or anything outside your home, you shouldn't be charged.

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Thank you so much for taking the time to reach out to Xfinity Support @user_pirhtw!  We are so glad to hear from you and want to help in any way that we can to ensure that you are having the best experience with your service.  No worries!  You have reached out to the best team to address your service concerns.  Have you been able to replace your HDMI cord?