I spent some time with online Chat and this worked for me:
Press setup button - LED turns red to green
press the channel up arrow until the TV turns off
press setup button once
Press TV power - it should turn on
This worked for me, but then I was having issues with the Xfinity remote OK button not working when I tried to click on the "cable box" icon on the ROKU main menu, so I also had to go to the tv settings and default to the cable box. Now when I turn the TV on with the Xfinity remote, it goes straight to tv (cable box) instead of the ROKU menu.
Another forum said Sharp is made by Hisense and to use those codes instead of the Sharp codes. Might depend on the model of Sharp you have.
Others to try
10178, 11660, 12098, 11314, 10748, 13382, 13118
Hope this helps!
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