Question Do I need a new main board?

[rvnclw37]

For $20, I recently got my hands on an Element 55" TV (E4SW5118) that turns on but doesn't make it to the smart menu. It freezes on the blue "Element" screen for about 30 seconds-1 minute and then powers down. I'm asking in as many places as I can - I'm very comfortable doing electronics repairs myself, and the main board seems to be plug and play, making it even easier. Is the main board the most likely culprit here, or will dropping $40 on a new one more likely be a waste of money?

 

[hang-the-9]

It's a guess, may fix it, may not. Find out how much a working model of that thing is and you can then decide based on your feelings about the risk of it not working vs money you spend on it.