Help - US LCD TV will not display UK Sky

If the JVC TV is a US model, the chances are it won't support European 50Hz sources. It isn't the resolution that's the issue - its the frame rate. (Historically countries selected frame rates that matched their mains electrical power frequencies)

The US uses 60Hz for TV broadcasts (or more accurately 59.94Hz), whereas Europe (and lots of other bits of the world) use 50Hz.

Whilst European TVs (with the HD Ready and similar European licensing logos) have to support both US and European frame/field rates and will accept US 60Hz HDMI/Component sources as well as 50Hz sources, the reverse is not universally true. (Cheap non-branded US models are often more compatible with 50Hz sources than mainstream manufacturers models which are often 60Hz only)

This is a regular problem experienced by people moving from the US/Canada to Europe - and the usual advice is not to bother bringing a displa over (or only use the imported display with 60Hz sources like games consoles, US DVD players, Blu-ray players playing 24/60Hz but not 50Hz content etc.)

European satellite, cable and terrestrial set top boxes (Sky, Freeview and Virgin in the UK) won't convert 50Hz broadcasts to 60Hz - they'll only output 50Hz at 50Hz - so won't work as sources if your TV is only capable of displaying 60Hz inputs.

There ARE 50/60Hz standards converters out there - which will convert an SD PAL composite 50Hz signal to an SD NTSC composite 60Hz signal - but the quality is low. There may be HDMI models as well (not sure how HDCP would be supported) - but low cost frame rate conversion is usually junk.