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It is for an external Audio connection: If you connect an external audio device using an optical cable, the Sound Output setting is automatically changed to the connected device. However, to make this happen, you must turn on the external audio device before connecting the optical cable. To manually change the Sound Output setting, do one of the following:
Sorry, there was a problem. Please try again later.It has one cable connection from the TV to the power box but I don’t know if it is fiber.
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