Hello, and sorry you're having problems. We are now connected on this website- which saves you money over having a Tech come to your home, and in many cases we can fix the problem you're having. In other cases, these things do require additional parts to fix. But I can help you with that as well.
When the TV was operating fine before and then moves to Channel Scan, this means the TV's Input was changed, and needs to be put back onto the one that you receive cable broadcasts from. So using the original TV remote, or the button on the TV itself, find the "Input" or "TV/Video" button and use that to select the Input you normally view from (HDMI 1, HDMI 2, etc.).
If you're unsure how to do this, then please get me the model number off of the back of the TV, and let me now if you have the original TV remote nearby.
Feel free to reply back if you need more help, or want to reply back with more details. It does not cost you anything more to reply back once you've rated. Please do rate me positively (at least 3 STARS) and I will continue with you until this is sorted. The positive rating ensures I am credited for my work.