OK,

Finally found some time to do some testing.

The CX520 does not like YCbCr 4:4:4 as suggested by f77 nor does it like Progressive JPEGS as suggested by Dennis.

As noted above, converting the .NEFs with ViewNX2 produces JPEGs which do not display. However, ufraw-batch does produce JPEGs which are acceptable to the TV from USB. I also connected it to Mezzmo and it is also happy with the same images via DLNA.

So, all good here.

Cheers,
Paul.