OK, there is a yes and no coming.
The power supply is no problem. LCD TVs use a dc power supply inside the device. So, if the power supply is an external "brick", you can just buy a 230V version. If you want to use the supplied power supply, use a UK to USA mains adaptor.
You will not be able to watch TV from the inbuilt tuner.
Read the manual to see if the TV has a "PAL playback mode". If it does, then you can connect a VCR, DVD, freeview box or whatever to the video inputs (either composite c-video, or s-vhs).
If it does not have a PAL mode, you may be able to use certain DVD players switched to "NTSC mode", but I couldn't tell you of any.
The SCART lead suggestion won't work because another name for a SCART is a "Euroconnector", and seeing as the US insisted on developing their own mobile phone networks because they didn't trust the "foreign" GSM technology, they certainly wouldn't trust our superior RGB video technology over their S-VHS jack.
In case anyone is in Japan and decides to buy a TV, beware. Japan also use the NTSC standard. However they also have a connection standard that uses the same style connector as the SCART. But it isn't the same!