I have a Sony KDL-52W3000 LCD TV that started having issues a couple of months ago. When we go to turn the TV on somtimes it makes a buzzing noise and then just goes to stand by and won't work. The only thing I have found to fix this is to unplug it for a while and then it seems to clear the problem up.
Also in the last few weeks my cable picture has started to ramdomly cut off. At first I thought it was the cable box but it now appears to be a problem with the TV (HMDI input).