Hello my name is Eric,
Welcome to Just Answer
Please tell me more about the cable box
What make/model box is it?
What resolutions are checked in the output resolution display menu?
Have you tried replacing the box yet?
If you need more assistance please tell me
What number best describes you?
1. I just want to know what to expect a repairman to charge me,
2.I want to try pushing buttons and checking connections
3. I will open the TV if needed, but have limited tools and skills
4. I have technical skills and have a soldering iron and or voltmeter
If I have helped you with your issue please click accept.
If you have more questions you can still respond until this post expires,
I will reply asap
Thanks
Eric