Digital TV set makers face big challenge: marketing.

Great, the DTV sets are here. Now what? That was the question being asked at last week's CEMA-sponsored Digital Engineering Conference, held in Las Vegas immediately after the Consumer Electronics Show.

The answer, according to major TV set manufacturers, is proper marketing -- with a little help from broadcasters and cable networks.

While consumer electronics manufacturers will certainly roll out DTV product to retail shelves this fall, most agree that 1998 will mainly be a year to look at HDTV, not to buy, with no significant sales until 1999. So consum