I have a Bose Cinemate 120 connected to the HDMI ARC on my LG UM7300AUE. Audio cuts out intermittently and sometimes it switches back and forth between HDMI ARC and Internal TV Speakers. I've tried this with a couple of HDMI cables. Tv already has newest software
Thank you for your post and welcome to the Bose Community.
I'm sorry that you are experiencing some audio issues between your LG TV and your CineMate 120 system.
Has this issue always been present or just started to happen recently?
Do you see any messages on the control console when this happens? Additionally, does the system seem that it is powered down at the times your audio switches to your TV speakers?
Do you have your devices connected to your TV or through the control console?
Charlotte G - Community Support
This is a new TV (LG 65UM7300AUE) and has been happening ever since install last week.
No error messages on the console, nor does it power off. Cinemate is the only device connected to the TV other than a coax cable for antenna.
I noticed that this issue only happens when it's on "TV" input. I was using the "HDMI ARC" input and the sound was perfect coming from the soundbar.
Thank you for getting back to me with this information.
Before you had this TV, did your previous setup work without any issues? Do you have another TV that you could possibly test your console with?
What do you mean by the HDMI ARC input? As there is not an option for this on the remote control.
I would first recommend a power reset of the system. This can be done by following these steps:
Also, disconnect your TV from power for 30 seconds and then reconnect.
Additionally, please perform a factory reset on the system.
Note: This reset erases all settings and returns your product to its default out-of-box state. If a SoundTouch adapter is connected, it must be reset separately.
I look forward to hearing back from you with the results of these steps.