I would be very surprised if the HDTV didn't have a switch-mode power supply (rather like computers these days), and quite surprised if it weren't capable of handing anything from 105 to 250 volts, 50 or 60 Hertz.
If it insists on 230 volts 50 Hertz, then you could get round that quite easily: all you need is a 110v AC to 12v DC converter (readily available in the USA) and a 12v DC to 230v AC converter (ditto in the UK). Just make sure the power ratings of both are adequate.
Unless the television set itself is dual-standard, the PAL vs NTSC thing will stop you.
I remember, years ago, earning a very nice bottle of wine for converting a very expensive German-bought television set to receive in the UK. The intercarrier sound frequencies are different - one's 5.5 MHz, the other's 6.0 (I forget which is which). It takes a couple of minutes if you know what to do.
I'm sure NTSC <-> PAL is much more difficult.