onn. 4K Pro built-in speaker stops working when connected to an LG TV (even when the TV is off)
Hey everyone!
I’m having a really frustrating issue with my onn. Google TV 4K Pro, and I’m hoping someone here has experienced something similar or knows how to fix it.
My setup:
Streaming device: onn. Google TV 4K Pro (latest firmware)
TV: LG 60UM6900PUA (latest firmware)
Connection: HDMI
Google Assistant hands-free microphone enabled
Built-in speaker volume set to High (80%)
The problem:
The onn. 4K Pro has a built-in speaker that should allow Google Assistant to respond to voice commands even when the TV is turned off.
However, whenever my LG TV is connected to power, the onn. refuses to play Google Assistant responses through its built-in speaker while the TV is off.
Google Assistant still hears me and executes commands, such as turning my smart lights on and off, but I get absolutely no audible response.
When the TV is on, Google Assistant responds through the TV speakers instead.
Here’s where things get interesting:
I discovered something while troubleshooting:
If I disconnect the HDMI cable from the onn., its built-in speaker works perfectly.
If I leave HDMI connected but unplug the LG TV from the wall, the onn. also responds through its built-in speaker.
If I plug the LG TV back into power, even without turning it on, the onn. immediately stops using its built-in speaker.
I even plugged the LG back into power while Google Assistant was speaking, and the audio stopped immediately!
I tested the same onn. 4K Pro with a Samsung TV, and the built-in speaker worked correctly when that TV was off.
Things I’ve already tried:
Disabling HDMI-CEC/SIMPLINK on both devices
Disabling Auto Power Sync on the LG
Enabling and disabling Quick Start+
Switching between HDMI 1 and HDMI 2 (ARC)
Trying different HDMI cables, including the original cable supplied with the onn. 4K Pro
Disabling surround sound and using stereo/PCM
Checking the built-in speaker volume
Checking the audio output settings
Confirming both devices are running the latest firmware
Reviewing Android TV developer options
None of these fixed the issue.
My suspicion:
It seems like the LG TV maintains some sort of HDMI connection or detection signal while in standby, causing the onn. 4K Pro to keep routing Google Assistant audio through HDMI instead of switching to its built-in speaker.
I don’t think this is an HDMI-CEC issue, since disabling CEC on both devices made no difference.
Has anyone experienced this with an LG TV and the onn. 4K Pro?
Is there a hidden setting, Android TV workaround, or HDMI-related fix that could force Google Assistant to use the built-in speaker whenever the TV is off?
I’d really appreciate any suggestions. I’ve spent hours troubleshooting this and I’m running out of ideas!
Thanks in advance!