I have the problem with correct connection and working NEO box (LED strips) and OLED LG C1 where there are 4 HDMI IN (inputs) but all of them have 4K 120 Hz.
May be the problem is that LG has HDMI IN (all 4 intputs) with 4K 120Hz (instead of 60 Hz)?
According to the specification inputs have 2.1 version.
I tried to connect NEO with all HDMI inputs but the problem's result is the same - strips do not work when I choose Screen in the APP
Sorry for my English in video . It was usual picture on TV (even not HD)
Is it correct strip's working in Music Spectrum mode ?
Then I tried to watch video 4K from Youtube
and 4K film from USB
and the problem's result was the same - LED strips did not work