I have the same tv, and found that you had the identical problem. I went into CC closed caption and did find that it was off. I scrolled through to make sure it was Off, then hit exit. I next went to Hyper Surround, which at this moment I have no idea what IT DOES.. however, after hitting that key, the tv was suddenly found on channel 3, snowy picture, however.. had sound! I switched to channel 4 for my input and WORKS~! Hope this helps you, cause I have no idea what I just did. Kids were obviously hitting a million keys.. again.

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