Intermitting on/off cycle, Plug in power cord and green On light comes on without a command and flashes for a few seconds and then goes off and the red stand-by light comes on for a few seconds, then the whole cycle repeats again. Cannot turn off unit during this time, it will turn off automatic in 5 min or so. There is no picture during this time. If I keep trying to get it to work, I may after awhile get a picture and sound which are good. When it is working ok, I read several voltages and they seem to be good. maybe it is getting a false on/off control voltage at power up ? I have no schematics for this tv, but do know how to do repair work.