Re: insignia NS-40D40SNA14 power issue

I am having a power issue with the same exact tv model. The initial problem was a possible lightning strike. The TV would power on for a short time and then shut off. So I ordered a power supply board and swapped it. Now the tv does not power on at all. What have I done? The board is the exact same. Are there any things that I can look for that I may have missed?