I've spent several hours with this code issue with a Sceptre TV. None of the codes worked to turn my tv on and off, adjust volumn and change channels. I tried all the resets and even spend some time with customer service chat where I was told to replace the batteries in the remote. They were new batteries so I ended that call.
I finally got everything to work by using:
SetUp - 986 (to clear)
SetUp - 991 then hold down CH Up key until TV turned off.
I had tried this method several times, but I finally tried it with the cable box turned off and guess what...This finally worked with the TV and I have full function, on/off, volumn, channels, mute.... Finally everything works with one remote.
I saw a couple of posts saying y'all got codes to work with cable box off? Are you still using the Comcast remote or the Sceptre tv remote? I'm a little confused... please help!