Owners of the popular Redmi Note 5 (Pro) often face a situation where the case of a smartphone becomes noticeably warm or even hot during active operation. This is especially true for a device released several years ago, as over time, the wear and tear of the thermal interface and software accumulation lead to a decrease in the efficiency of heat sink. The Snapdragon 636 processor, although considered energy efficient, is able to generate a significant amount of heat at prolonged loads, requiring timely dissipation.
Overheating is not just a discomfort when touching, but also a signal that the system is operating in a stressful mode. If the temperature of the processor rises above the permissible values, the operating system forcibly reduces the clock frequency, which leads to lags and brakes of the interface. In the long run, constant heating negatively affects the chemical composition of the battery, reducing its life and capacity.
In this article, we will discuss in detail the software and hardware methods of solving the problem, you will learn how to conduct a deep cleaning of the system, what settings of the MIUI interface should be changed first and how to correctly diagnose iron malfunctions. A competent approach to maintenance will prolong the life of your gadget and return it to its former performance.
Diagnosis of temperature and identification of culprits
Before taking active cooling action, it is necessary to pinpoint the source of the problem. Often users mistakenly believe that the processor is causing the heating, when in reality the culprit may be a communication module or a faulty battery. For accurate diagnosis, it is recommended to use specialized utilities such as CPU-Z or AIDA64, which output data from internal sensors in real time.
Note the sensor readings at rest and under load. The normal temperature for the Redmi Note 5 in standby mode is between 30 and 35 degrees Celsius. If the simple readings are above 40 degrees, this indicates background processes or a hardware defect.
⚠️ Warning: The critical threshold for lithium polymer batteries is heating above 45-50 If your phone reaches these levels without heavy gaming, stop using it immediately to avoid battery bloating.
By analyzing usage statistics, parasitic applications can be identified. Often, social networks with poor optimization or suspended background processes are the culprits. Built-in battery monitoring in Android settings allows you to see which application consumes the most power, which indirectly indicates the source of heating.
Software optimization of the MIUI system
MIUI is known for its aggressive energy management practices, which, however, don't always work correctly on older devices. The first step to cooling is to turn off unnecessary visuals and background activity. Go to Settings → Advanced Settings → For developers and find points related to scaling animations. Reducing these values will not only speed up the interface, but also reduce the load on the graphics accelerator.
Special attention should be paid to the functions of “Memory Extension” (if available in your firmware version) or similar virtualization services. Using internal flash memory as a RAM puts additional strain on the memory controller, which leads to heating the lower part of the case. For the Redmi Note 5 with its RAM capacity, this is often redundant.
- 📉 Turn off auto-update apps in Play Market and GetApps, leaving this feature only for Wi-Fi networks to avoid background loading.
- 🔒 Limit background activity for rarely used apps through the Battery and Performance menu».
- 📡 Turn it off. GPS, Bluetooth and NFC, when not in use, as constant signal search warms communication modules.
While support for the Redmi Note 5 has officially been discontinued, some users are installing custom firmware where heat optimization can be improved by enthusiasts. However, stock MIUI in the last available state also contains important security and power management patches.
Management of Background Processes and Applications
The accumulation of cache and junk files is one of the main reasons why Xiaomi Redmi Note 5 starts to warm up after a year or two of active use. Apps are overgrown with temporary data, which the system has to constantly index. Regular cleaning of the cache through the built-in Security app helps reduce the load on the disk subsystem.
Particularly dangerous are the heavy apps that continue to work in the background even after closing. Messengers, email clients and navigators often use geolocation and network connection all the time. Set restrictions for such programs can significantly reduce heat generation. Go to Settings → Applications → All applications, select the desired one and find the item “Activity Control”.
☑️ Checklist for cleaning the system
Revising installed desktop widgets is recommended, and live wallpapers and widgets that constantly update content (news, weather, currency rates) keep the processor active, preventing it from going into energy-saving mode, replacing them with static images is an easy way to reduce the load on the GPU and CPU.
Hardware factors and hull maintenance
With years of use, the thermal interface between the processor and the copper heat sink plate dries and loses its properties. In the Redmi Note 5, the cooling system is built on the removal of heat to the metal frame of the case, so the contact should be perfect. If the phone is over 3 years old, replacing the thermal paste with a quality one (for example, based on silver or ceramics) can reduce the temperature by 5-10 degrees.
Also worth noting is the state of the battery: a degraded battery has high internal resistance, which causes it to warm itself even when it is under little load or charging. Battery bloating is not only the cause of heating, but also a direct safety threat, requiring immediate replacement of the battery.
| Component | Cause of heating | Method of decision | Difficulty |
|---|---|---|---|
| Battery | Wear, high internal resistance | Battery replacement | Medium |
| Thermal interface | Thermopaste drying | Disassembly and pasta replacement | Tall. |
| Cover | Poor thermal conductivity of the material | Removal of load cover | Low. |
| Dust inside | Disturbance of air convection | Ultrasound/purging | Medium |
Don't forget the environment, too: Dense silicone or leather covers create a thermos effect, preventing the body from cooling naturally, and it's best to remove the protective accessory when playing or charging, especially if you're in a room with a temperature above 25 degrees.
Charging rules to minimize heating
The process of charging a lithium-ion battery is always accompanied by an exothermic reaction, that is, the release of heat. The Redmi Note 5 uses Quick Charge fast charging technology, which in the final stages (after 80%) can cause noticeable heating of the bottom of the smartphone. This is normal, but it can be minimized.
Don’t use your phone while charging, especially for resource-intensive tasks. Simultaneous processor operation and battery charging create a double heat load that Xiaomi’s cooling system may not have time to compensate for, leading to trottling and slowing charging.
The myth of freezing charging
Use original or certified cables and power supplies. Cheap analogues often don't have a proper power controller, which causes the current to flow unstable, causing the power controller to overheat the phone. If the phone is warming even when it's off while charging, it's a sign of a faulty charge controller or battery itself.
Radical measures: Resetting and reflashing
If software and cleaning methods don’t work, you may have some critical errors or conflicts in the system after a lot of updates, in which case a full reset to the factory settings (Wipe Data) becomes an effective solution.Be sure to back up important data before this procedure, as all information will be deleted.
For advanced users whose Redmi Note 5 is no longer getting official updates, installing custom firmware (LineageOS, Pixel Experience) is important, because they lack heavy MIUI software and often work faster and colder than runoff. However, unlocking the bootloader and flashing the firmware carries risks and requires careful study of instructions.
⚠️ Warning: When resetting or flashing, make sure the battery level is at least 60%.Stop writing system files because of the discharge can turn the phone into a "brick».
Clean installation of the system allows you to eliminate the influence of third-party software that could have infiltrated the system and mined cryptocurrency or perform other hidden heavy operations. After resetting, the phone can warm up more than usual in the first hours - this is the indexation of files and optimization of applications, the process will take up to 24 hours.
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Useful tip: After resetting, do not install all the applications at once. Give the system an hour or two to work normally so that the background indexing processes are completed without additional load from the installed software.
FAQ: Frequently Asked Questions
Is it normal for Redmi Note 5 to warm up in games?
Does the Cooler Master app help or analogues?
The phone is still warm even in standby mode, what to do?
Can I use a fan for cooling?
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The main reason for the overheating of Redmi Note 5 in 90% of cases is software conflicts of background applications and dried thermopaste. + maintenance solves the problem.
To sum up, the Xiaomi Redmi Note 5 remains a reliable device that requires only proper maintenance. Timely memory cleaning, battery monitoring and reasonable charging use will allow you to avoid overheating problems and prolong the enjoyment of using your smartphone.