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I know that hobbyists do this on vintage equipment, repairing '80s home computers and such. But is it at all common at scale with recent motherboards? I find it hard to believe that any substantial percentage of 2010s motherboards that fail are being diagnosed, repaired, and put back into service.

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What do you think happens to electronics that are sent back during warranty due to being defective?

They are mostly "refurbished" (=repaired and cleaned), and then sold again. If possible, even as new. Or, of course, sent back fixed.

I'd be open to any contrary numbers on this, but my expectation has been that most mobos pulled out of service, especially by high-volume operators like the AWS datacenters, are just junked, not repaired or refurbished.

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