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Hello, Without knowing the Model Number of the TV we're dealing with here, or the Source you're viewing from OR how it's connected- I can only offer general information.
In most cases when this happens you simply hit the Input button by mistake and changed from Video to COMP. To fix it find the Input or TV/Video button on the ORIGINAL TV REMOTE, or the TV itself and select "Video" or "AV".
If you need more assistance then I need to know the model number off of the back of the TV and specifically what sources are connected to it.
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.
Were you able to fix the problem?