Find the failing link
Phone arrows and TV-speaker volume work; Check the external-audio setup
Neither phone nor TV remote changes soundbar volume; Check the TV-to-soundbar control path
Physical TV remote works but phone volume does not; Compare the app's supported volume route
Soundbar's own volume control also fails; Troubleshoot the soundbar first
Samsung describes SmartThings volume controls but says the available remote options vary by device. That is support for its official app, not a guarantee for every independent remote. Samsung's SmartThings control guide.
Check the selected sound output
Open the TV's sound settings and read the selected output. On interfaces with a Sound → Sound Output menu, select the connected soundbar or receiver; use the model manual if the path differs. Then check the soundbar's selected input against the cable you actually connected.
If practical, temporarily choose the TV speakers and try phone volume once. Restore the soundbar output afterward. Successful TV-speaker control narrows the problem to the external-audio branch; it does not prove a particular cable or CEC setting is at fault.
Follow the branch for your connection
HDMI ARC/eARC: Check that the cable uses the ports labeled ARC or eARC on the equipment. Verify the HDMI control setting required by both manuals; Samsung calls its HDMI-CEC feature Anynet+. Samsung's soundbar instructions distinguish HDMI ARC setup from optical setup. Samsung: soundbar control with a TV remote.
Optical: Optical carries audio, while remote-volume behavior depends on the equipment's control arrangement. A physical TV remote may also send infrared commands that your phone's network remote does not reproduce. Check the manuals to see whether that is how your equipment is configured. If the soundbar responds only to its own remote, keep that remote as the volume fallback.
Bluetooth: Check volume using the soundbar controls and the TV controls separately. Do not copy an ARC or optical button sequence into a Bluetooth setup. Ask the equipment manufacturer which volume control is supported for this combination.
If the TV remote works but phone volume does not
Try the same small volume change with the TV remote, the soundbar remote and the phone, keeping the selected input unchanged. If only the soundbar remote works, focus on the TV-to-soundbar setup. If the TV remote works too, its command may reach the soundbar differently from the phone's command. That is especially useful to check with optical audio.
If the official app works but another app does not
Keep the TV, soundbar and selected output unchanged while comparing one volume command. If the official controller changes the actual sound level and the other app only displays a TV volume overlay, report those distinct results to the app developer. A changing on-screen number alone is not the success condition: you should hear the soundbar level change.
For broader audio diagnosis, use TV remote volume troubleshooting. For official-app setup, see SmartThings as a TV remote.
Stop changing phone permissions once navigation works reliably. If the soundbar or physical TV remote also fails, use the soundbar's own controller and contact the appropriate manufacturer with both model numbers, cable type, selected input and the comparison results. A factory reset is not a useful first step for one failed volume route.
Sources for these instructions
- samsung.com support guidance — checked 2026-11-07
- samsung.com support guidance — checked 2026-11-07