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Hello, I'm Shahid and will be happy to assist you. I need additional info to troubleshoot the issue. - 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?
- Can you provide picture of TV screen so I can view those horizontal lines which will help to diagnose the issue.
Thanks for the info, have you tried to unplug TV and cable box power cords from wall outlet for 10 minutes to reset, replug back in and check?If not yet, can you try it now and reply back with the result?
Sorry to hear that, it seems LCD panel related issue and I really need to view a picture of TV screen to determine it.