Many Xiaomi device owners face a situation where the smartphone body becomes unpleasantly hot during active use.The Redmi Note 4, despite its popularity and time-tested platform, is not immune to this problem.Heat can be caused by both natural components processes and serious failures in software or hardware.
In this article, we will discuss in detail the physics of the process and the software aspects that lead to an increase in temperature in your gadget. Understanding the heat source is the first step to extending the battery life and preventing sudden shutdowns of the device.
Users often confuse normal heat generation when charging or playing with critical overheating, which requires intervention, and it is important to learn to distinguish between these conditions so that you don’t panic in vain, but also to not miss the moment when the smartphone really needs help.
Snapdragon 625 processor: architectural features and heat generation
At the heart of the model in question is Qualcomm’s Snapdragon 625 chipset, the first processor to be built with a 14nm process, which was considered a breakthrough in energy efficiency at the time of its release, but even today’s technology can’t completely eliminate heat at high loads.
The architecture of this chip is built on eight Cortex-A53 cores operating at frequencies up to 2.0 GHz. Unlike big.LITTLE circuits, where there are powerful and economical cores, all cores are the same, which means that when the load jumps sharply, the system uses all available resources, which instantly affects the temperature of the case.
⚠️ Warning: Prolonged operation of the processor at maximum frequencies in a poorly ventilated case can lead to degradation of the thermal paste inside the device and detachment of the plumes.
The normal operating temperature for cores of this processor is considered to be a range of 35 to 45 degrees Celsius in standby mode and easy tasks. When you start heavy applications or games, the temperature can naturally rise to 50-55 degrees, which is the standard mode of operation for mobile platforms of this class.
However, if you see values above 60 degrees on simple tasks, such as browsing the web or reading books, it is a signal of a violation of the heat sink. In such cases, the heat does not have time to dissipate through the metal case, and the device begins to artificially lower the frequencies (trottle) so as not to burn out.
Programmatic reasons: MIUI optimization and background processes
Often the source of the problem is not hardware, but the software shell of MIUI. Aggressive battery optimization and a host of pre-installed services can create a constant background load. The system constantly polls update servers, synchronizes the cloud and checks geolocation, which keeps the processor in good shape.
One common reason is that apps are overclocked in the background, and some programs, especially social networks and instant messengers, are not working properly with Android power management, and they can run processes that don't fall asleep after the screen is closed, and they can continue to consume resources.
- 📱 Continuing work GPS GLONASS, even with closed cards.
- 🔄 Synchronize large amounts of data in the cloud Mi Cloud or Google Photos.
- 📡 Network search in the zone of unstable signal reception (3G/4G).
- 🎮 Background processes of gaming launchers.
To identify the culprit, go to Settings → Battery → Consumption, and here you will see a list of the applications that use up the most power, and if you have a program that you haven’t used in a long time at the top of the list, you should delete or limit it.
Also worth checking for system updates: Xiaomi developers periodically release patches that correct code errors that cause cyclical reboots of services. The lack of an up-to-date firmware version can cause unstable work.
☑️ Software diagnostics
Environmental factors and operating conditions
The external environment plays a huge role in thermoregulation of the smartphone. The Redmi Note 4 has a metal body that acts as a radiator. If you hold the device in a tight silicone or leather case, the heat cannot physically escape, creating a thermos effect.
Using a gadget in direct sunlight is another critical factor: solar radiation heats the screen and internal components faster than they can cool down, and in such conditions, the lithium-polymer battery is subjected to double stress from a chemical reaction and from external temperature.
Humidity and dust also affect heat transfer, and the dust that gets into the jacks and slits of the speaker creates an insulating layer, which over time causes the phone to warm up significantly even at medium load.
Effect of covers on temperature
There's a myth that cold weather is good for electronics. In fact, sharp cooling, like overheating, is bad. Condensation produced by putting a cold phone in a warm room can cause a short circuit that will cause the board to overheat locally.
Problems with the battery and charger
Battery health is a key aspect of smartphone health. Li-Po batteries degrade over time, their internal resistance increases, when charging and discharging, a worn-out battery releases more heat than a new one, a physical law that cannot be circumvented by software.
Using unoriginal or damaged chargers is a common cause of overheating. Cheap power supplies cannot provide stable current and voltage by giving out pulsed jumps. The power controller in the phone has to constantly adjust parameters, which causes the zone near the charging connector to heat up.
| Symptoms. | Probable cause | Risk |
|---|---|---|
| The upper part (camera) is warming | Communication processor or module | Medium (trottling) |
| The bottom is warming (connector) | Charger or controller | High (fire) |
| Uniform heating | Background processes or games | Low (discharge) |
| Bloating back cover | Battery degradation | critical |
⚠️ Warning: If the battery is swollen and pushes the screen or back cover, immediately stop charging and replace the battery!
You can use an engineering menu or special applications to diagnose the battery status ##6485## It's in the phone app. MB_06 The health of the battery will show (Good/Bad), MF_05 — number of full charge cycles.
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Try not to play heavy games while charging.This puts a peak strain on the power controller, as it charges the battery and power the processor at the same time, causing maximum heat.
Hardware malfunctions and wear of components
If software methods don't work, the reason may be "hardware." The dried-up thermal paste between the processor and the screen (which in Redmi Note 4 serves as a radiator) is a common problem for devices older than 3-4 years.
You also have to look at the Wi-Fi and cellular module, and if the antenna module is damaged or has poor contact, the phone will increase the signal power as it tries to find the network, and this will cause intense heat generation at the top of the device.
A short circuit in the power supply chain is the most dangerous scenario, and it can occur due to moisture or a fall, in which case the heating will be local and very strong, often accompanied by a rapid discharge of the battery even when it is turned off.
To fix hardware problems, you need to disassemble the device, remove the back cover, turn off the plumes and visually inspect the board for oxides, swollen capacitors or traces of burns. Replacing the heat pads with better ones can reduce the temperature by 5-10 degrees.
Cooling and Optimization Methods
There are a number of things you can do to help bring down the temperature of your device without going to the service center, and the first step is to clean up your boot list, and turn off apps you don't need right after you turn on your phone.
Using Flight mode in uncoated areas will prevent the communications module from constantly trying to find a base station, one of the most effective ways to reduce heat on the road or on the subway.
- 📉 Reduce the brightness of the screen or turn on autobrightness.
- 🚫 Turn off Bluetooth and NFC, unless they are used.
- 🔄 Reboot your phone once in a while. 2-3 trial-day.
- 📵 Avoid using heavy ones. 3D-wallpaper and live widgets.
In extreme cases, you can perform a full reset (Wipe Data), which will return the device to factory status, removing any accumulated errors in the registry system, and remember to back up important data before this procedure.
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The most effective way to combat heating is complex: replacing the thermal interface during wear, refusing to use on charging and controlling background applications.