If you can get estimates for free, ask around. But here the repair is my guess of 150 base charge then 200ish for boards and you are north of 350USD fast.
While this model at https://www.walmart.com/ip/Sceptre-50-Class-FHD-1080P-LED-TV-X505BV-FSR/631796609 is not 4K, it is 50 inches and today only $180USD.
Since the minimum repair charge is 150 in my town, I doubt you can get this fixed for less than a new TV.
I am experiencing the screen flickering and I’m not sure how screwed I am at this point. I’ve determined it’s not a port issue and I’ve done a factory reset in hopes that would work. Since I can’t return the item, any idea of how much this would cost to repair? I understand there may be a lot of factors as to what needs repairs but I just want a ballpark range. My decision now is to take another chance and repair the tv or sell it as is. Thanks in advance!