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Hi, I'm Nathan.Sorry to hear that you're having trouble, but I'll do my best to help you. Please give me a few moments to review your details here.
Does it not turn on at all, or does it turn on briefly and shut back off?What prompted the main board change initially?
Thank you for confirming, Tony.
That would not be a main board issue, that is a power supply issue and that is the board that should be replaced: http://www.ftvparts.com/products/toshiba-75033153-power-supply-pk101w0050i-fsp156-3fs01.html
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