Lcd is not lighting up

my son connected the laptop's power cable to the metal part of the monitor cable, and since the tv doesn't want to work. I think two things could have gone wrong, the main board and the power board. i don't want to replace both, if only 1 is gone.
I opened the back and checked the fuse, it is good, but the green light doesn;t come up, after pressing the power button a few times.
Any idea which one should I change, main board, the power, or both?
it is a Toshiba 32AV502RZ.
Thanks for any feedback.
Tamas

There is one company that will do it for $139 http://www.ebay.com/itm/13-APPLE-MacBook-LCD-Screen-Repair-Replacement-Service-/ 270597769033?pt=LH_DefaultDomain_0&hash=item3f00e24749

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