I have a Hitachi 46W500 television and when you try to turn it on no picture comes up and the red "on" button blinks intermittantly with a corresponding sound that sounds like a winshield wiper, What do Ineed to do to repair?

Possible there is a shorting due to a component failure which triggers the current protection to trip off power. So what is needed is to remove the back panel and check if there a heating issue with any component, check the output drivers. Also check the +B on the board and if there is drop in the +B as the shunting trip comes on. If so identify and trace for the output drive-EHT/driver/ to be isolated. if the +B build up the fault is relative and so a continuity test will confirm.
Also make sure that there is no sign of dry soldering joints and if so you must check if such oscillations are caused by poor joints.