WCVB-TV (Channel 5) topped the ratings in the most newscasts during the February sweeps, but there were other winners. WFXT-TV (Channel 25) won at 10 p.m. And the 2010 Winter Olympics, which aired on WHDH-TV (Channel 7), delivered huge local audiences for the NBC affiliate, whose late newscast shifted to 11:30 p.m.