I just bought the TV and love it. I pair the TV with my exisiting soundbar (JBL SB400) via HMDI 4 (ARC).
It was working fine for couple days until yesterday when I realized volume up/down on the remote does not change the volume on soundbar. Same thing with Mute button.
The soundbar definetely reconignized by TV because it is listed on the source and OSD "receiver (HDMI)" with plus and minus displayed when volume up/down clicked on the remote. CEC also still works because the soundbar turn on/off along with TV.
I have tried to reset remote i.e.: soft restart, self diagnose HDMI4, remove remote battery and re-pair with TV, unplug the TV for 10mins, and factory reset.
I feel this might have something to do with input plus because if i recall it correctly the issue start when I disabled and enabled it back.
Not being able to control the volume is very frustrating. Please help!