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I have a LG OLED55CSPUA 4K Smart TV. Not sure what happened but I can't get the MUTE off the tv. There is a bar on the top right corner that shows the speaker symbol with a line through it. In the Middle of the bar is the word MUTE. On the right side of the bar is a O. I don't know how to get the sound back on. What can I do?
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