Problem with vizio HD50M

Question

Hi and thanks in advance for any help you can give me.

I have a 50" Vizio HD50M. After I turn the unit on the green light will illuminate, but after about 10 seconds it goes into overload(green/yellow flashing). I'm thinking it's the psu but I don't see any signs of a blown capacitor or anything. I've also visually inspected the y & Z boards and didn't find any problems. Heating the board has no effect. Are there any known defects in the psu for these tv's?

Thanks again!
George