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By Pranay Mokida
Issue
Whenever I start any video—whether it’s streaming apps, HDMI input, or a USB movie—the SC9S plays for a minute or two, then suddenly loses connection. Audio instantly falls back to the TV’s internal speakers, and the TV acts like the soundbar no longer exists on the eARC port. The soundbar display still shows “eARC” (sometimes flips to “OPT/ARC” for a second), but no sound.
Temporary Fix
The only thing that gets audio back is power-cycling the TV (standby isn’t enough; full reboot required). After that, the bar reconnects… until the next random dropout. This can happen multiple times during a single movie, which is a great way to kill the vibe.
What I’ve Tried
New HDMI 2.1-certified cable (same result, so original cable seems fine).
Disabled Quick Start+ and Simplink in the TV settings, then re-enabled.
Factory-reset both TV and soundbar.
Tested ARC instead of eARC—works, but no Atmos and same occasional dropout.
Plugged the soundbar into a different power outlet (in case of power spike).
Observed Patterns
Dropouts happen sooner with Dolby Atmos or DTS content, but even stereo YouTube videos eventually cut out.
No obvious heat buildup; bar is in open air, front facing.
Happens whether soundbar is wall-mounted or on its stand.
Questions for the Hive Mind
Anyone else seeing eARC instability with the SC9S on the UP77 series?
Could this be a handshake timing bug on the TV’s HDMI board?
Any hidden service-menu tweaks or firmware betas worth trying?
Should I just RMA the bar, or is the TV the real diva here?
Appreciate any insight—my couch and I thank you in advance!
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By starwoodtech
I have an optical plugged into a hearing aid box. I also have an LG S95QR sound bar plugged into the eARC.
Works fine in eARC. When I try to select the optical + TV option for output, it switches over ok for about .5 seconds, then automatically switches back to the eARC output without me doing it.
Does anyone know what it might do this? Why can't I change my output if I so choose?
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By Brendank
I had an issue with powering on the tv in which pressing the lg power button on the first ocassion did not turn on my Oled C1 77 inch Tv.
LG replaced the powerboard, however since the replacement I have an issue with intermittent audio dropouts via earc.
EARC has functioned previously on my Tv when connected to an Anthem 710 receiver and for a few months now on an Anthem AVM 70.
The set up has remained the same in terms of audio settings, passthough, match screen and sound set to bypass and I have tried multiple cables, switching the tv off, resetting earc, but I still have the issue.
It is very odd that after a replacement power board I have this issue. It almost seems like a comparability issue between the new board and the existing components or something else is wrong with the TV.
Any ideas?
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By Fabulos47
I have an Onkyo TX-NR6050 connected to a LG OLED77C2PUA using a high speed HDMI cable.
When the TV is tuned on the Onkyo comes out of stand-by mode. The volume control on the LG remote is able to raise and lower volume control on the receiver. The LG has a connection to the Onkyo but the LG is not passing any data.
If the receiver is out of stand by mode (by either turning the receiver on first or turning the TV on --> off --> on) then there is a data connection and sound can be heard.
The issue seems to be in the timing of the handshake between the two devices. The LG has no problem turning on the onkyo but whether the data connection is established is based on the receiver being out of stand by mode first.
I tried everything found on line from changing HDMI connection type form Auto, PCM, and pass through. I have tried disabling the quick start from LG setup.
It is very annoying considering the amount of money invested into a setup that is suppose to be eARC 2.1. I should not have to use the home theater remote.
Any ideas?
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By KNICKNL
TV: LG OLED65C16LA
I have a Sonos ARC Center Speaker connected to the HDMI eARC port, when this happens bluetooth function on TV does not stay activated, is there a solution?
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Question
Andrew Peebles
I recently bought and hooked up a Sony HT A9 to my LG C9 OLED. And that works ... but to my surprise now, when I power on any other connected device (Nintendo Switch, PS5, AppleTV) when my system is off, this powers up the TV, which then powers up the Sony. Perhaps this is the intended behavior, but sometimes it get wonky ... like I'll power up the Switch, but the AppleTV also comes on, and the Sony might be outputting the AppleTV or the Switch. I actually want to go back to the old days where my universal remote powers on the TV, the device I want, changes TV input to device. That is how the system worked before all this Sony HT A9 eARC business. Did exactly what I asked with no randomness. Any ideas?
0 answers to this question
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