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He believes the problem is not related to the A17 Pro chip itself, but instead "likely the compromises made in the thermal system design to achieve a lighter weight," which resulted in a "reduced heat dissipation area" and "the use of a titanium frame," all of which combine to "negatively [impact] thermal efficiency."
OK, that's the problem, but what about the fix?
The fix may very well be hard for some to swallow.
Kuo believes that Apple will patch this using software updates, but "improvements may be limited unless Apple lowers processor performance."
In other words, Apple will need to make the iPhone 15 Pro slower.
Kuo also has a stark warning to Apple that if this issue is not addressed, it could "negatively impact shipments over the product life cycle of the iPhone 15 Pro series."
OK, let's take a step back here.
Apple, just as every other reputable company launching a new product, will have extensively tested the new iPhone under a great many conditions, and one of those will have been high load. Apple will have designed and tested the thermal dissipation mechanisms (the way it dissipates heat) long before iPhones started rolling off the production line and into the hands of users.
This means one of two things.
First, Apple knew about this problem and let it slide.
Considering the iPhone's prominence as Apple's flagship product and how even minor negative feedback would quickly become widespread, I find it hard to believe that Apple would play a "ship it and see what happens" game.
If Kuo is right and this is indeed a thermal issue based on design, then I find it unlikely that Apple didn't know about this already. And the solution will likely be that Apple will have to throttle down performance to mitigate this excessive heating issue.
The same logic applies to charging. Apple will have tested fast charging extensively before users started needing to charge them. I don't think that this is an inherent issue with charging. Charging and battery management tech are pretty well established, and while battery problems can happen, they're incredibly rare.
The other possibility (I think it's the more plausible one) is that something changed between testing and shipping.
Maybe it's a bug. Some developers could have thought they could squeeze more power from the processor by shifting more work to the high-performance cores. Or, maybe some deep tweak in iOS code is causing the GPU or machine learning chip to run amok. There could also be something unexpected happening when the handset is fast charging.
It could also be a hardware bug.
Perhaps a last-minute change was made to a component. Given that Apple sometimes sources identical components from multiple suppliers, discrepancies between these components might be causing the issue.
It could also be a manufacturing or component defect.
The likely solution to many of these problems will come in the form of a software patch. As has been demonstrated by the iPhone 12 radiation story, software patches can fix a lot of things.
In the worst-case scenario, where a hardware defect is identified, the faulty hardware might need replacement. Instead of a recall, Apple would probably treat this as a support issue, offering affected customers an exchange opportunity.
For now, we're speculating in the dark, and we'll have to await Apple's response.