TV plasma Panasonic won't turn on, no blinking leds, power supply OK

Hi everyone,

I have a Panasonic Plasma TH-42PY80P, and since 1 week, it doesn't turn on, no red led, no blinking red, nothing at all !!

I tested the power supply on an another TV, it works fine, I changed the 2 other motherboard, the one on the left, named TNPA4410 1SC and the one of the right of the power supply, named TNPA4411 1SS.

And still nothing !! No LEDs, no blinking, nothing !

Can anyone suggested me any idea, could it be the logic board TNPA4439 1D that would cause the whole TV to not have any power ??

Thanks a lot for your precious help