Re-read post 23.
I would assume if it were the TV's DAC, I would think all audio would be kerfutzed but that post seems to say that ain't so. It seems the internal speakers are fine.
I'm pretty sure it is the TV. The problem is likely on the HDMI board or HDMI DAC interface. With what he has posted there is a problem decoding audio from an HDMI source when a device is connected via HDMI. Since the noise occurs when I device is connected to an HDMI connector, I suspect something has happened to one of the grounds.
On researching this I find that there are a number of grounds in an HDMI cable and plug.
Audio is carried on TMDS channels 1 and 2, and video on channel zero. Now these are carried as twisted balanced pairs in the cable.
As you can see all three TMDS channels have their own grounds, as to DDC/CEC and the TMDS clock.
I have further found that anything that unbalances these twisted pairs is likely to result in static.
I suspect that most likely TMDS channel 1 or 2 grounds are interrupted somewhere, most likely on the HDMI board itself.
So I would like to know how many HDMI ports this TV has and if more than one, if they all have the problem. If there is only one HDMI port on the TV, then the ground interruption is most likely where the port attaches to the board. If there are multiple ports and they all do it, then the interruption is somewhere on the board.