55G300U flickers on then off

I've been have a problem for 3 months where the TV ignored the "auto on" setting and started turning the TV on for no reason. Nothing connected to it would be on either.
Today it decided to quit working. When you turn it on the lcd display and word toshiba quick flashes and then goes out. The green power light goes on and stays on. Holding power in for 10 seconds eventually turns the green light off.
If I unplug the cable from what I would call the main board (center back of TV with the transformers on it for 5,12 and 24v) that is the 5v,12v and 24v cable that runs to the input board (has hdmi ports ect ect) I get no volts a on any of the rails. But as soon as I plug that cable back in the lcd display flickers on then off. So do I need to check power on this connector with the cable connected? My meter leads are to big to fit in the connector so I need to get some wire from work thin enough to get in there (I'm an industrial electrician and do this alot for other boards).
Based on what I said which board is most likely the problem? Feel free to ask other pertinent questions cause I'm sure I forgot something.

Apparently no one has had this issue? I find that hard to believe.

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