“Just purchased 55" Toshiba 55L711U18 yesterday. Sound works except through HDMI cable box. Also can you set up Chromecast thru two different mobile apps, one android, one apple?”
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I was practically pulling my hair out on the exact same issue. I was getting no audio with my Roku via HDMI. If I used composite connections the Roku audio was fine. The HDMI on the Roku was good because I tested it on another TV. The cable was good because I tested it on another TV. The HDMI port on the TV was good because I got audio when I attached the XBox360 to that input. I finally found a setting on the TV that allowed me to change it from HDMI 2.0 to 1.4. Once I changed it to 1.4 the Roku worked fine via HDMI. Doing some reading it seems that I may have some issues with 4k content if I leave it on HDMI 1.4. HDMI 1.4 seems to support 4k, but only at lower refresh rates, I guess time will tell once I get some 4k devices.
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