In the past the panels for TV had only one refresh rate, and all rates have been interpolated in the built-in DSP. Most people think that if a TV accepts all kind of formats, it will also display them "natively". Multiple fs makes a TV more expensive, and this is why true multisynch PC monitors are more expensive than a TV.
The only way to know for sure your TV has a native refresh rate, whatever it that (common 60Hz), is to use test BDs and check for artefacts. Or know somebody in the R&D of the manufacturer
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