I have the same problem with my 58 in. UN58MU6070 TV. I can use my Sennheiser Headsets when watching programs coming from DirecTV through HDMI 1 but when I stream from Amazon Prime, the TV speakers work fine but no sound from the Sennheiser that normal get sound through a Digital to analog adopter plugged in to the Optical Audio Out socket. This is a major problem that may be related to the WiFi adapter in the TV.
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