I’m having the exact same issue with my View 51 Case. I have the same issue with my fan controller on a View 51 Case. I got it working for almost a full day but it stopped after a reboot. That being said... I called TT support and they are suppose to send me a new control board but I’m not too confident based on the comments in this thread. I’m close to just cutting my losses and returning this case picking up something else instead.
It’s a shame too as I was looking to add some more LED fans to this system and even order a TT Premium Control board only to find out the pins on the fans are different than anything else TT makes. Thus making it even hard to add more LED fans to this system without replacing the originals...