It is FAR more efficient to utilize the former business model. The latter model means a much lower rate of customers receiving defective parts: but requires a trained technician, time, and known good parts inventory for testing. Other businesses part out broken devices, figure out why the device failed, sets that defective part aside, and sells all the other working parts. Some businesses part out broken devices, list each part separately, and refund whoever complains.
Most of these boards are taken from recycled machines, and many vendors do not test machines before listing parts on eBay.
Expect turnaround time to be longer with this option: the first board you receive will often be faulty.
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