It's really interesting that in this and other threads, the root problem is completely ignored.
Is it too inconvenient that the TV manufacturers (and also newer players of all kinds) cause the problem because they don't adhere to the SPDIF standard?
I have a Sony DSC-88 here, no, not a camera but a "Digital Signal Checker". The comes from the Sony Professional series and for over 20 years it was the standard for repairing and checking DAT, MD and CD players as well as professional studio equipment on the digital side.
In my circle of friends I had 2 x E30, 1 x Gustard and 2 other DACs that did not work on TVs via the optical connection.
On the DSC-88 all DACs worked without any problems. I connected the DSC-88 to two of the TVs and it couldn't do anything with the signal.
With an AK4118 board that converts SPDIF/Toslink to i2s and from i2s back to SPDIF/Toslink, both the DSC-88 and the DACs on the two TVs worked.
So if someone has a Topping E70 that doesn't work on their TV, they can send it to me for testing on the Sony DSC-88.