Fabulos47

Here is an update.

Completed wiring for home theater and permanently mounted TV.

For some reason I set the TV to the HDMI 2 input that the eArc HDMI cable is connected to. When I turn on the TV it displays HDMI 2 then shows AV Receiver. From there the no input is displayed since I have not connected any external devices (i.e. firestick) to the receiver HDMI input.

I can go to the apps that I use to stream TV and the sound works. So either LG applied an update or when connecting to eARC set home to HDMI 2 so that the handshake can be completed.

There have been 1-2 times that when I lowered the volume that something goes wrong and the audio gets disconnected. It has happened so infrequently that it is no issue. Either way, I can confirm that the LG C2 is know working with Onkyo receiver.

11 hours ago, BlackEye said:

Not being able to examine your set-up directly,  I can't answer with any specifics. I did read the manual for your Onkyo model. It is a bit iffy regarding ARC and eARC. My experience is that using ARC can be flaky. When I had ARC equipment, I used the digital/optical output of the TV to the optical input on the receiver. The limitation is 5.1 audio out., but it always worked correctly. I have had zero problems using Denon receivers equipped with eARC and your model of LG TV (I just did an install in Oregon last month featuring a 77" C2). With eARC, I always use an ultra hi-speed, 48Gbps cable. I mostly install full 7.2.4 Atmos systems, but this method should work fine for 7.1 and 5.1 applications, as well.

In your case, I can only suggest checking the use of CEC (possibly by default) on either your TV or receiver and making sure that you have a hi-speed cable from eARC to eARC HDMI ports and that the LG is set to eARC. If you double check everything I mention and you still have a problem, you might contact Onkyo to see if there is a compatibility issue with LG TVs (there shouldn't be ... you purchased the best value in TV ...Samsung is behind LG in the food chain). I have a C1 and C2 77" OLEDs and experience zero problems with sound, or vision and I have 5 devices using up all the available HDMI ports on my Denon. Full Atmos in and out.

Finally, make sure your firmware is up-to-date on both your receiver and TV.

I know this stuff can be VERY frustrating when it doesn't perform as expected. Keep plugging. I hope you find that it is a simple fix. Best of luck!

Mr. Black

Thank you for taking the time to write out a detailed response. I think the issue is with LG and not Onkyo. Only because turning the Onkyo on/off does not resolve but when I turn LG on/off then the data is sent.  My resolution was to use a logitech Harmony Hub. The hub has been programmed to turn on all devices (TV, receiver, and sub) at the same time. The hub sits in the closet with the equipment and has a remote that possible operates on Bluetooth. An external IR device is used to send signal to the TV.

My main concern was how to make the system easy for my wife to use. The option was either turn on LG then turn off and then turn back on  or use the Harmony remote to turn all on then use LG remote for all other functions.

On a side note: I only use the apps on the LG. I do not use cable or an antennae.  Is there any way for the LG to be set that when it turns on the home (app) screen is shown? The one option to set only shows cable, antennae, or LG channels. I programmed the shortcuts in the remote (i.e. 1=Peacock) but it is still annoying that every time I turn on the TV I have to hit home.

8 hours ago, BlackEye said:

My advice, with decades of experience: Do not let any device control another device. NEVER turn off your receiver or any other device attached to the receiver (AppleTV, disc player, whatever). ONLY turn the LG TV on and off. 

If it was only that easy. As soon as I turn off the LG TV then the receiver goes into stand-by.  The problem is that when I turn the LG TV back on there is an issue in providing audio data.

I am using the HDMI eARC output from the TV to the receiver for sound. This is not an unusual for a home theater setup. I am really regretting not getting the Samsung version.  I thought paying close to $3K for a tv that offers a specific feature would work. Since I ma nto the only one that has this issue it seems like a class action lawsuit is waiting to happen since they are advertising a feature that is faulty.

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?

Hooking up a new Onkyo receiver to LG C2 77” tv using HDMI 2 port. 
 

LG tv has no problem bringing receiver out of stand by mode. Volume control works, jus has no sound. The Onkyo app shows no data connection. Turn tv on/off and data connection shows and sound works.
 

seems like a timing issue from the tv turns on to the connection with the receiver. The receiver needs to be out of stand by before powering up the tv.