Yes, an interesting question if not somewhat arrogant...
Firstly this is a casual conversation. I am in no way instructing you or any other member of this forum about the "law". I am merely pointing out legal issues that are important in the case of the faulty logic board situation(s) - this could include existing or future situations. All l am explaining here is Apple's duty to its consumers is not one dimensional - it is not merely related to the consumer contract or the SLA etcetera. It is, as l understand your "question" a question about thinking about the problem of faulty product liability in a multi-dimensional way.
The consumer contract tends to contain exclusion clauses, which will limit damages.
However, extrapolating from a legal principal, and objectively looking at Apple's chain of production, you may see that there are multiple quality control problems in the way Apple has outsourced its production. This way, Apple is far more liable / culpable for faulty manufacturing than a straight forward charged attack that merely concentrates on Apple's failure to implement good quality and supply a sub-par product. Most other Apple products are well made, l am a "fan" of sorts. The legal principal is there, but it is not easy to attack a multi-national.
As you are from Ireland, you can forget it, we in Europe can't bring class action suites readily, and would face many many administrative and procedural stubbing blocks - especially in many civil law jurisdictions. Although class action suites are becoming more common they are still quite rare in Europe, especially before the European Court of Justice.
We would have to subpoena all the various contracts with subcontractors and documents related to its multi-national manufacturing operations - these tend to amount in the 100,000's - and it would take a team of lawyers and technical specialists about 9-12 months just to prepare a case ( a lot can happen in the mean time and the case may fall through). I do not have time for that. That is just one challenge. You would need a massive team, l would say about 30 to 40 assistants and another 12 specialist lawyers and 20 engineers and maybe 5-7 managers. With the tiny amount of damages civil jurisdictions pay out for product liability cases, that means that all these workers would have to work pro-bono. Lawyers don't work pro-bono, they want $.
Also you may face problems in the process of acquiring the documentation - multinationals are very good at trying to hide themselves behind stacks and stacks of papers. As Apple has (strong) links to the US establishment, you are likely to face other US governmental restrictions and road blocks in analysing Apple's production practices. The US economic system is inherently political, and multi-nationals are able to protect themselves through political connections and lobbying to avoid liability abroad. I don't want to sound anti-Western, but the US is not such a good democracy or a transparent system of Government it claims itself to be. The US government has protected multi-nationals for many years, by making sure they can't be sued. Also the US government engages in large scale covert targeting of groups that have issues with multi-nationals - as was the case with Central Asian banana republics when they tried to bring cases in the 1990s.
In that context, Apple's human resource problems at its sub-contractors and off-shored production facilities may be a more efficious approach; - in that Chinese courts may be far more willing to provide documentation and cases against Apple's sub-contractors, which Apple can't really protect itself against, as many Civil law jurisdictions' unlike the US, are not so prone to powerful lobby groups. Also it would avoid a direct confrontation with Apple. This is all legal stuff. My advise would not be to sue, if you aren't happy go elsewhere. My 2008 Macbook is still wizzing along just fine, so its not all of their products.
The best solution of Apple is to better integrate its off shored plants with the right set of KPI's or metrics to measure quality production and that Apple management must establish high quality control criteria through-out the company. However the key thing for Apple is to integrate into all their subcontractors production lines - sensors and systems that measure product manufacturing quality and the maintenance of standards. You have built to order Computer Integrated Manufacturing stations which cost less than 40,000 EUR to test a circuit board and collate all the info of that product down to the milli-ampere. Bad sold has generally different electrical properties and it would have been easy to see that there was something wrong with a batch of products this way - we have the internet, this would have been brought to Apple's management team's immediate attention. Apple like many multi-nationals does not maintain good quality standards in its production, because there is a tendency to outsource the productions and problems elsewhere. The
I hope you get the jist of what l am getting at.
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