Set power supplies appear prone to fail By Mark Huffman, ConsumerAffairs.com Millions of consumers went out and purchased a flat screen television set 12 to 24 months ago, hoping for years of trouble-free viewing. Increasingly, some of these consumers are encountering the same frustrating - and expensive - problem. "My children were sitting and watching TV and it all of sudden went black," Angela, of Anaheim, California, told ConsumerAffairs.com. "The sound was still on so I thought maybe the video cord was loose or something. I tried everything and realized that nothing was going to work to fix this problem. Got the same run around as everyone else. The TV costs more to fix than I paid for it." Angela's lament is one of 61 complaints about Vizio flat screen TVs received at ConsumerAffairs.com in the last 12 months. Many of the complaints describe the same problem; suddenly the picture disappears, leaving a blank screen - "the black screen of death,...