I disagree - insofar as it depends on the credit card and the issuing company. It's entirely possible that the credit card issued a chargeback after having taken hardly a look at the matter. I don't think there is any risk to a small claims case by the seller against the buyer (well, except that the seller may lose). The credit card company is not the legal arbiter of the matter.
Zig, I have been a business owner accepting charge cards, a business manager accepting charge cards, and been an employee working for a company accepting charge cards (as an accountant). I can assure you that the credit card companies do NOT issue chargebacks without some basis to do so. Now yes, it is possible that the customer could lie convincingly enough to cause them to feel that they had a basis to issue the chargeback, but if that is the case, the seller can very easily dispute that and get the chargeback reversed. I have gotten many a charge back reversed when it was valid to do so. A good example of a lie that would work at first would be "product never received". An easy rebuttal of that it is simply proof of delivery. It is not a difficult process.
To some extent you are wrong that the credit card company is not a legal arbitor of the matter. The contract that the sellers sign with the credit card companies and the contracts that the consumers sign with the credit card companies give them the right to make those sorts of decisions, contractually. A consumer or seller who breaches the contract could find themselves either without a credit card or without the ability to accept credit cards.
Therefore yes, a seller could sue in small claims over a chargeback, but also yes, the seller takes a risk in doing so. As a seller, I would not have done so unless it was a seriously important situation.
In this particular scenario I tend to side with the consumer. The seller was given multiple opportunities to repair the item in question and failed to do so. Unfortunately for the consumer, the chargeback only netted him 1/3 of the purchase price, but that might possibly provide the funds to have the item fixed by someone actually competent to do so.