The high temperature alarm of a mobile phone is usually triggered by the motherboard CPU.

Most components of iPhone products have temperature sensors, and the motherboard CPU will detect the temperature of each component in real time. If it exceeds the threshold set by the system, it will prompt a high temperature warning to stop the phone from working and ensure its safety.

Hih temperature alarm threshold: 

refers to the temperature at which the phone emits an alarm message. It determines the maximum operating temperature of an iPhone, which is generally fixed at around 60 ℃. This is because the highest and lowest temperatures that the device can withstand are relatively fixed.

Mobile phone temperature rise: 

refers to the temperature at which various components in a mobile phone are higher than the ambient air temperature (ambient temperature) during operation. The power consumption and heat generation vary in different situations. The higher the power consumption, the greater the current passing through and the more heat gen.

The main heating components of a mobile phone are:

1. 5GRF module: When the phone signal is weak, it consumes a lot of power, while when the signal is strong, it consumes very little power.

2. CPU: It consumes a lot of power in large 3D games, but it is very low during sleep.

3. Battery charging module: When the battery volume is low, fast charging of the phone consumes a lot of power, and when the battery level is greater than 80% or when it is not charged, the power consumption is low.

4. Camera: It consumes a lot of power when recording and taking photos, and it consumes very little power when exiting.

5. Screen: When the LCD brightness is set to its maximum, or when the OLED screen has a completely white image and is set to its brightest, it consumes a lot of power,

6. GPS module: It requires real-time calling during navigation, which is very power consuming, both in the front-end and back-end.

7. Other devices such as WiFi Bluetooth speakers. Relatively high power consumption during work.

erated. This heat generation is generated by the operation of the device itself and is independent of the ambient temperature. Usually, this temperature is superimposed on top of the ambient temperature.

Mobile phones generally have good heat dissipation design, where the heat from one component is quickly dispersed throughout the entire phone, resulting in a better user experience. However, in some cases, high temperature alarms are more likely to occur, such as:

1. When a mobile phone is using 5G signal to play large-scale 3D games online, and the battery is low, it needs to be quickly charged. At this time, high-power devices are working at high loads. The cumulative temperature rise reaches its highest point, and we assume that the temperature rise reaches 35 ℃.

2. If the ambient temperature is lower than 25 ℃, then the total temperature is less than 60 ℃, and the phone can work normally.

3. If the ambient temperature is higher than 25 ℃, and the total temperature is greater than 60 ℃, the phone will enter an alarm state.

4. If the battery protection board is not designed properly, it is easy to experience ultra-high temperatures and high temperature alarms during fast charging.

Overall:

1. The higher the ambient temperature of the mobile phone, the more likely it is to generate a high temperature alarm.

2. The more heating components are working at the same time, the more likely a high temperature alarm is to occur.

3. Poorly designed batteries are also one of the heating components, which can cause high temperature alarms.

Battery quality judgment method:

1. Turn off the power consuming app, turn off the screen, and put the phone in airplane mode in an environment with a temperature below 25 ℃. Charge the phone. If the phone enters a high temperature alarm, it indicates that there may be a problem with the battery. (It is also possible that there is a problem with the charging circuit of the motherboard.)

Another simple method is to replace the original battery with a battery level lower than 30% and test it under the same conditions to see if there is a high temperature alarm.