Potential problem with sale.

If it is a compatible issue, you have no obligation to do anything.

Anyone who buys something to be shipped should realize there is the possibility that it could be damaged in transit. If this unit doesn't function correctly with his next TV, I think it would then be safe to assume something could well be wrong inside the case. It's a bummer, but the buyer should take it to the shop to find out, and make a claim with the shipper if need be. It's hard to get satisfaction that way though in the absence of obvious box damage, so if I were the seller, I'd probably offer to split the repair cost, but I see no reason for you to have to take the piece back and pick up the repair tab by yourself (unless you did a lousy packing job). Best of luck!

I agree with Dtsag completely. It's the responsibility of the buyer to know if what you are selling is compatible. Your responsibility is to accurately represent what it is you are selling. If you do that, and it doesn't work for the buyer, then that may be a problem but it is not yours unless you CHOOSE to take it back upon yourself.
The result is: that now YOU have the problem and HE/SHE no longer does.
I don't know about you but one of my cardinal rules is that: Whenever someone brings me a problem, and tries to give it to ME, I make it very clear that they will LEAVE with the problem. Because if they give it to ME, then I now have the problem, and THEY no longer do.
A lot of folks will try to do that to you...don't let'em.

Here's a slightly different scenario but nonetheless on the same subject.
I recently sold my Rel Sub here on Audiogon, I was paid rather quickly so I took the sub off my system, packed it well and sent it out to buyer.
The next day after he received the sub I received an email from him saying that the sub was DOA and it did not work right off the bat, he went on to tell me that he opened the sub and found that some of the wirings are burned including some caps and switches, he also added he's got two more REL subs and he builds his own amplifier. Naturally I was shocked as I know for a fact that the sub was in excelent condition before I shipped it out.
His next email he mentioned that he could repair the sub but he needs some parts namely the fine and coarse switches for the crossover. He then proceeded to ask me if I could help with it, I of course said yes and suggested that I will contact Sumico and see if they have the part that he needs, the buyer also told me that Sumico may have the switches but it sells only as a whole circuit board, he went on to say that once I get the price of the parts we can talk about how to deal with the situation.
The whole time I'm still trying to figure out what the hell is going on? Is this buyers complain legit or not. I'm thinking to myself we would probably share the cost or maybe I would pay more.
The whole weekend passed and the following Tuesday I received another email from the buyer saying that he figured out how to make the sub work and their's no problem anymore.
What do you guys think of this situation?
The buyer has a few positive feedback and I hate to speculate,,, I ended up shaking my head and just tried to forget the whole thing even happened.

Caveat Emptor...it's not like the unit was misrepresented or damaged. You are not obligated to buy back. Anyway, having 1 or even 2 negative feedbacks will do little or no damage, especially if you were not at fault.

my 2 cents