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Hello, The plug is not likely bad, no.
Can you tell me if there are ANY signs of life on the TV at all (power light lit or blinking, etc.)?
Okay so no signs of the power light, any click at all when power cord is plugged into the outlet?
Do you have a multi-meter and do you know how to use it?
So that would point towards your Mainboard. If you have the standby voltages, I'm not sure why you'd ask about the power cord. If there's any voltage at all the power cord is good.
Where did you test power Input?
Did you change your meter over to AC?