guess it depends on what went wrong and how much they went through to fix it.
Could have a customer returned it saying it has no sound, i've tried everything, etc and it turns out they didn't have hdmi passthrough on
or
Could have a customer that dumped pop in the back of the tv, shorted some stuff, they replace the PSU and it worked but never did much to clean the pop from the screen or mainboard and that may be an issue 6 months down the road.
or
Could be a problem where a lot of the TV's die in 6 months from crappy caps on the board and they replace it with the same board, same caps and you might get another 6 months of out it before the same problem happens again, except this time you only have like a 90 warranty cause it's refurb instead of the standard 1 or 2 or 4 years warranty the person had that returned it.
Comes down to you never know what the exact issue is that brought the tv back for repair. Customer error, bad design flaw that they repeat cause that's cheaper than fixing, or bad damage that get's minimally fixed to get it working again.
For a TV, I'd go new. We just bought a 70", 50", and 5 32"'s on black friday, and got extended warranties on all of them. For the money we paid for the 70" and the 50", I want new, I want it fully replaceable, etc. The 70" was like 2500. I wouldn't have taken a refurb for 2430. Now the 32"s, they were $170. A refurb for $100, maybe.