I'd say good materials and QA. Naturally some batches of parts (like LCD screens) might have a higher chance of failure than other batches, which is usually kno

I'd say good materials and QA. Naturally some batches of parts (like LCD screens) might have a higher chance of failure than other batches, which is usually known at manufacture time. Then QA, where "bad" products don't make it to consumers hands. Counterfeits would probably use more of these defective materials and go through less QA.