Recently, the news that the iPhone 6S automatically shuts down has attracted attention. Many users have reported that the iPhone 6S will automatically shut down when the battery has not been used up. On November 15th, China Consumers Association sent an investigation letter on Apple iPhone 6 and iPhone 6S abnormal shutdown on November 15th, asking for the reason and processing result within ten days.
On November 21st, Apple officially responded that the iPhone 6S, which meets certain conditions, can replace the battery for free, but Apple did not give the specific reason why the 6S will automatically shut down.
So, what is the reason for the large-scale automatic shutdown of the iPhone 6S? Why do smartphones inexplicably "strike"?
Are the weather plagued?In fact, the iPhone 6S has automatically shut down. As early as last winter, users have already reflected on Weibo, but this problem was not common at the time and did not attract attention.
Apple's official website screenshot
The official response from Apple at the time was that "the weather is too cold." Apple's official website announced that users should use iOS devices in the environment of 0 ° C ~ 35 ° C.
We know that the current battery of smart phones is a lithium polymer that generates electrons through chemical reactions.
When the temperature is too low, the chemical reaction rate of the battery will be slower, and the amount of electricity supplied per unit time will be reduced. What we can see in appearance is that the battery's power consumption is faster, causing the phone to shut down.
What is puzzling is that many users in the southern region have also encountered the problem of automatic shutdown of the iPhone 6S. It can be seen from the feedback from the netizens that in a dozen degrees or even a dozen degrees, the iPhone 6S will also be turned off, even when the battery is still halfway through.
This shows that the iPhone 6S automatic shutdown problem is not directly related to the temperature, this "black pot" can not give the weather.
Who is the "black hand" of shutdown?Since it has nothing to do with the weather, it is more likely to be a problem with the phone itself. The outside world's reason for the iPhone's automatic shutdown is basically concentrated on iOS system problems, battery problems, motherboard defects and other three aspects.
System problems can be solved by restoring the system. The problem is that some phones will still automatically shut down after upgrading the system to iOS 10. What's more, all iPhones run the same iOS system, but only some users have automatic shutdown.
The cause of the problem is more likely to be on the battery and motherboard.
LowBatteryLog is a log record when Apple's battery is low and automatically shuts down. There are 10 in total, and the voltage of each record shows that the voltage is automatically between 3.4 and 3.5 V. In other words, Apple's normal operating voltage should be above 3.5V. If the battery voltage is as low as 3.4 V, it will automatically shut down even if the battery is sufficient.
The battery voltage of the mobile phone is monitored by the metering circuit of the battery management system and then transmitted to the power management chip. When the voltage is as low as 3.4 V, the power management chip will send a signal to the CPU, and the CPU will judge whether to shut down.
If there is a problem with the code of the power management chip or the driver power management chip, an error or a false signal is sent to the CPU, causing the battery to be fully charged but automatically shutting down. For this kind of problem, you can solve the problem by upgrading the software to correct the code.
However, this time Apple officially proposed to "change the battery for the faulty machine" measures, which means that the equipment that has automatic shutdown, the cause of the failure is not the code, but the hardware problem.
After long-term use of the lithium battery, as the number of charge and discharge increases, the battery capacity will shrink. Both the iPhone 6 and the iPhone 6S are models that have been released for more than one year. According to the theory, the battery capacity is at least 80%. It is very likely that this batch of iPhone6S phones that are required to "change the battery" has problems in battery cycle life.
Metering circuit for iPhone battery
The above is the theoretical analysis of the iPhone 6s will automatically shut down, from the fault record of the phone itself, it is caused by insufficient voltage. From the official statement of Apple, it has been possible to determine the serial number of the mobile phone in question. It can be seen that Apple already knows where the problem is from, but there is no explanation.
How does the mobile phone go through the winter?It should be noted that although the automatic shutdown problem of the iPhone is not directly related to the weather, it should be paid more attention when using the mobile phone in winter.
The optimal operating temperature of a lithium battery is 0~45°C. At this temperature, the mobile phone battery can be regarded as normal operation. The closer the temperature is to 0 ° C, the lower its performance.
When the mobile phone lithium battery is at 0 °C, its capacity will be reduced by 20%. When it reaches -10 °C, the capacity will be reduced by about half.
When the battery temperature is too low, the power will not be released, and the mobile phone will easily crash, but when the battery temperature rises, the mobile phone will return to normal.
In winter, due to the large temperature difference between indoor and outdoor, many mobile phone users use the mobile phone to go indoors, making the water vapor condense on the mobile phone and enter the main board of the mobile phone. It is also easy to cause the mobile phone to suddenly crash or not boot.
Some mobile phone technology experts suggest that the weather is getting cold, the temperature difference between indoor and outdoor is large, and mobile phone users should try not to call indoors from outside. In addition, the time for the public to answer the phone outside should not be too long, and it is best to use the headset to talk to prevent the battery from being frozen.
Of course, you can also put your phone in the inner pocket of your clothes and heat it with your body temperature to let your phone pass a "warm winter".
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