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I also purchased this TV and the ARC does not work for me, I have followed the Manual, the HDMI CEC is turned on and I am connecting this to an LG Soundbar (SH5B) HDMI ARC port. I ended up connecting it via Optical cable. I have also changed HDMI cables just to make sure it's not the cable and still no sound.
Sorry, there was a problem. Please try again later.I had the same issue, but after searching online, and messing with it for awhile, I got it to work. This should help: http://tv.manualsonline.com/manuals/mfg/toshiba/65l621u.html?p=65
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