When playing videos using the Roku Media player (local or DLNA) or via Plex on TCL 55R635 connected to Samsung Q700A soundbar via HDMI EARC, I regularly get a high pitched and startling tone\beep\squelch when the playback starts on some files.
This only happens when Passthrough audio is set on the Roku. If I have Custom or Auto it doesn’t do the tone\beep but I get a second of silence instead.
I also noticed the silence issue with YouTube whenever an Ad would kick in or original video playback resumed.
If I set passthrough which avoids the silent audio gap I get the obnoxious beep\tone at the start of local file playback on some files.
I don't seem to have a good option.
I haven’t found a trend for consistency as it’ll do this beep\tone on the same two files while testing and then next day it’ll be fine … and then it’ll come back. It’s not all files and it’s not specific audio codecs (DTS and DD or DD+ all do it).
I’ve swapped HDMI cables, returned\replaced the soundbar, factory reset devices multiple times, tried wireless\wired network, pulled power in various combinations. I had no problem with an older TCL Roku TV with older Samsung soundbar (what this new setup replaced). I have no problem with another Roku device hooked up to another TV (not the same setup though); and no problem with iOS devices.
Occasionally ... the problem goes away and it'll be fine for awhile with no "beep" - but eventually it comes back again. I have no idea what is different between when it works and when it doesn't. I would prefer to use the passthrough option and not have to worry about the BEEP.