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Hello, I'm Shahid.Sorry to hear that you're having trouble with this but I'll do my best to help.
1- Could you please get me the model number written on back of TV?2- What video devices/ sources (such as cable box DVD player etc) are connected to TV and does the problem occur on all video input sources?Thank you.
I still need above requested info to assist you.
OK, have you tried to press Input or Source button located on side control panel a few times to get connect video input in TV that might help to get cable box picture on TV?