Thermal imaging reveals before and after


The iPhone 15 overheating issue was both confirmed and visualized using thermal imaging, and now the same technology has been used to show the impact of Apple’s software fix.

In our own survey, a full 57% 9to5Mac Readers with iPhone 15 models had experienced overheating issues…

iPhone 15 overheating

We first started seeing widespread reports of this issue shortly after people received their new iPhones. Some users, including our own Ian Zelbo, found that their phones were almost too hot to hold under similar conditions.

My iPhone 15 Pro Max is almost too hot to touch right now while fast charging. I thought people were exaggerating, but no, it’s not a very good thing.

In our own survey, a total of 57% of readers with iPhone 15 models had experienced this issue:

  • During charging: 19%
  • During demanding usage: 11%
  • During normal use: 27%

Apple’s solution

Apple confirmed the problem, but denied reports that it had anything to do with the Pro model chassis being changed from stainless steel to titanium. In fact, the company said, the latest models are actually better Heat dissipation compared to previous iPhones.

The iPhone maker told us it was a combination of bugs in iOS 17 and problems with apps like Instagram and Uber that were getting bad enough to cause the phone’s temperature to spike.

Apple released a fix in iOS 17.0.3.

This update provides important bug fixes, security updates, and resolves an issue that could cause iPhone to run hotter than expected

Some were concerned that the company had reduced the performance of the A17 Pro chip to achieve this, but there was no indication of this in the benchtest results.

Before and after thermal photos

Objective data for this issue was provided using forward-looking infrared (FLIR) cameras, also known as thermal imaging cameras. It not only provided a visual representation of the heat, but also showed the specific temperature measured – which was significantly higher than those measured from competing phones.

ZDNet The same kit was used to take temperature readings before and after installing iOS 17.0.3. This confirmed that the update has indeed resolved the issue.

First:

I used a thermal camera to measure heat and found that the iPhone 15 Pro Max heated up to 107.1 degrees Fahrenheit. It ran much hotter than other iPhones and Android phones, which typically maxed out at 85 to 95 degrees when fast charging in my tests. The hottest of any other phone when tested under the same conditions was the Samsung Galaxy Fold 5, which reached 98.7 degrees Fahrenheit.

Later:

I downloaded the iOS 17.0.3 update and allowed my iPhone 15 Pro and iPhone 15 Pro Max test units to drain their power and then connected them to fast-charging using the same parameters and the same equipment in the same location as my previous tests. Plugged in for. , This time they never got more than a little hot to the touch, and they never reached above 93.8 degrees Fahrenheit. They stayed between the high 80s and low 90s — a big improvement from before iOS 17.0.3 when the two iPhone 15 Pro models were consistently above 100 degrees Fahrenheit when fast charging with a 35W charger.

You can see the visual results in the photos above.

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