I had a similar issue with my MS650. Samsung support did a factory reset on my tv and it worked for a day and the issue came back. Then a rep came out and went into the service menu and turned on and off the EDID option for port 3 (ARC) and then unplugged and replugged the HDMI cable. This fixed the issue and he said it was a common problem on the series 6 (2017) Tv's. If you're TV is out of warranty then get into the service menu and switch EDID off and on. Otherwise get a rep to come out to do it for you. Cheers
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Hey guys, I learnt a few things today from the Samsung tech support which were trying to fix my HDMI ARC dissapearing issues. What they essentially did was login to the tv remotely and do a factory reset and also did a reset on the soundbar by pressing + and - . This fixed the issue I have the UA55MU6100 tv which has the smart remote (no numbers on it) therefore I can't get into the menu my self without having one of the old school remotes . i.e. https://www.google.com.au/search?q=samsung+remote&rlz=1C1CHBF_en-GBAU796AU796&source=lnms&tbm=isch&s...: If you decide to purchase this remote to access the service menu here are the instructions (8 methods please try each one till it works) First power off your TV using the remote, then press following buttons quickly on the remote: Info + Settings + Mute + Power Mute + 1 + 8 + 2 + Power Mute + 1 + 1 + 9 + Power Display/Info + Menu + Mute + Power Display/Info + P.STD + Mute + Power P.STD + Help + Sleep + Power P.STD + Menu + Sleep + Power Sleep + P.STD + Mute + Power If you dont want to purchase the remote then this can also be accessed by using a mobile with infrared (i.e. Samsung galaxy S5) Once your in the menu disconnect all HDMI cables from the TV and then click Option, Factory Reset. Once the TV is reset and you've entered in your wifi passwords and samsung account, proceed to resetting the soundbar ( + and - volume keys) Then proceed to connect all HDMI cables in and hopefully this should fix it. The reason why HDMI arc issues exist is because doing a soft reset doesnt actually clear the RAM or error logs in the tv and may scramble some part of a code when upgrading the firmware. So it's pointless doing a reset by the normal tv menu. It's needs to be Hard reset by the Service Menu. Make sure you don't touch any other options in the service menu as it may cause more issues. I hope i've helped out at least a few people.
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