Was it an actual "TaoTronics" branded panel, or one of the knock-offs? I don't know if there's a difference, but when it comes to servicing, it might be easier if was a "genuine" Tao. How was it mounted, how high above the water, any salt creep or splash getting into it?
Re: Warranty...Depends on where you bought them. Some have one, some have two. Either way, it should be covered. The logistics of getting it back and repaired could be a nightmare if it has to be shipped to China, and how do you handle lighting the tank in the interim?
This is my #1 concern with these units, as I have a small tank and will only need one set, if it dies, I'm "attached to another object by an inclined plane wrapped helically around an axis".* Buying a spare set is an option, but then I might as well plunk down the cash on a name-brand set....decisions, decisions.
The lighting decision is the only thing keeping me from going FOWLR
to reef on my nano.