I remember reading somewhere that Topping tightens the connection conditions of S/PDIF(COAX/OPT) in order to improve the sound quality.Yes, it's LG 65NANO796NF TV (I am from Russia)
And work perfectly with Rotel and Marantz via OPT (TOSlink). So... It's problem with LG?)
As a result, it seems that there is a problem that it cannot be connected to a device that operates according to a loose standard.
This is just a guess from the information I have obtained so far.
I'm persistent, but make sure the LG 65NANO796NF TV's OPT output is set to PCM-2.0 ch.
Make sure dolby and other Surround settings are turned off.
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