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Extremely grainy picture

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Extremely grainy picture

What would be the causes of an extremely grainy picture. Is on all channels and recently is almost unwatchable. Happened as we were leaving our condo with an elderly renter. I anticipate that she will be unable to troubleshoot or even call Comcast for help.
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Silver Problem Solver

Re: Extremely grainy picture

The most likely reason would be a poor cable connection. Check everything for clean and tight.