Most of the components that go into t.v's now come from the one place and are just shipped to the relevant companies for the fancy exterior assembly. There are a one or two i'ld steer clear of, but on the whole they are all the same. Watch out for Tesco offers they are pretty good.
If by 'one place' you mean the Far East, then maybe. There are quite a few manufacturers making LCD panels now, and there are significant differences in the quality of image these can display.
Leo