“I hooked up the HDMI out from my cable box to HDMI1 in, but no picture or sound was passed to the TV. The minute I moved the cable to the HDMI3 input, it was fine. Why? The HDMI 1 input is marked (ARC). What does that mean?”
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Hi Gilthoniel4 The Audio Return Channel (ARC) for your Insignia™ - 24" Class F20 Series LED Full HD Smart Fire TV, it connects your TV and audio system with a single High Speed HDMI® cable and eliminates the need for an additional composite audio or optical cable. Insignia Products Lisa https://insigniaproducts.com
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