Many owners face a situation where their Xiaomi Redmi Note 4 starts to noticeably heat up while in use.This device, released a few years ago, is still popular, but time takes its toll, and the physical wear of components becomes noticeable. Most often the heat comes from the processor at the top of the case or from the battery in the bottom.
Overheating can be caused by software errors and hardware malfunctions. Understanding the nature of heat is the first step to solving the problem. If the case gets hot when you start heavy games or video calls, this may be a normal option, but if the phone gets hot while you're on standby, it's an alarm.
In this article, we will discuss in detail all possible causes of overheating for the Redmi Note 4 model, taking into account the features of its Snapdragon 625 and Helio X20 processors. You will learn how to diagnose, whether to worry about the state of the battery and what actions will help prolong the life of the smartphone.
Programmatic failures and background processes
The most common cause of heat is software. MIUI is famous for its functionality, but sometimes optimization leaves much to be desired. In the background, dozens of applications can run that consume CPU resources, even if you are not using them right now.
Often the culprits are heavy applications or miner viruses that covertly use the computing power of the device, the processor starts to run at its limits, which inevitably leads to a rise in temperature, and heating can be observed immediately after a system update, when files are re-indexed and applications are optimized.
⚠️ Warning: If the phone is warming off while charging to an unbearable temperature, immediately stop charging.This may indicate a short circuit in the power chain.
To identify a problem program, you need to go to the battery consumption statistics, and you'll see a list of the applications that have been most powered in the last day, and if you have an application that you rarely use, you should delete it or limit its background activity.
Features of the hardware of the Redmi Note 4
The Redmi Note 4 came in two major versions: the Snapdragon 625 processor and the MediaTek Helio X20. The chip version from MediaTek has historically been prone to higher heat under load due to process and core architecture.
And over the years, the thermal interface between the processor and the metal frame of the case, which acts as a radiator, dries up, the heat sink deteriorates, and the internal heat does not have time to dissipate into the environment, and owners often notice that in the summer the phone warms more than in the winter.
The table below shows typical temperature conditions for different use cases of a serviceable device:
| Use case scenario | Normal temperature (°C) | Critical temperature (°C) |
|---|---|---|
| Standby regime | 25 - 32 | Above 40. |
| Social Networking / Browser | 32 - 38 | Above 45. |
| Games/Navigation | 38 - 45 | Above 50. |
| Fast charging. | 35 - 42 | Above 48. |
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Using a transparent silicone case can degrade the heat sink by 15-20%. If the phone is warming, remove the case for heavy use.
Problems with the battery and charger
Lithium-polymer batteries degrade over time.The internal resistance of the battery increases, which leads to more heat being released when charged and discharged. 4 more 3-4 In the past, the battery could have run out of life.
The quality of the charger used is also important. Cheap Chinese power supplies often fall short of the declared performance and give off unstable voltage. This causes chaotic heating of the power controller and the battery itself. The original cable also plays a role: thin wires create resistance.
- 🔋 Battery bloating is the most dangerous sign requiring immediate replacement of the power supply.
- ⚡ Heating only in the lower part of the body indicates problems with the battery or plume.
- 🔌 Using a low-quality Power Bank can cause current surges and overheating.
You can check the battery status using an engineering menu or special diagnostic applications, although they only show approximate data, the real capacity will only show a connection to a PC and the use of utilities like AIDA64 or Battery Info.
☑️ Diagnostics of the battery
Impact of communication network and modules
Networking is one of the most energy-intensive processes for a smartphone. If you're in a sensitive area, the Redmi Note 4 is constantly increasing the power of the transmitter. The communication module is running in extreme mode, which causes a lot of heat to the top of the device where the antenna is located.
A similar situation is observed when using 4G/LTE mobile Internet instead of Wi-Fi. Transmitting large amounts of data over the cellular network requires significant energy costs. If the phone warms up during a conversation, this can also be due to the operation of the radio module.
⚠️ Warning: Do not attempt to disassemble the phone to "enhance antenna" or isolate modules, this will cause complete signal loss and disrupt the screening of the device.
To save energy and reduce heat in areas of poor coverage, it is recommended to temporarily turn on Air Mode or switch to 2G/3G Only mode. This will reduce speed, but will save charge and reduce heat generation.
Methods of software optimization of the system
If the hardware is working, a good setup will help to lower the temperature, first of all, you should turn off unnecessary visuals and animations. Going to "Energy Saving" mode limits background activity and processor frequency.
Cleaning the cache and removing unused applications also have a positive effect. MIUI system has a built-in optimizer, but sometimes manual cleaning through the Settings → Memory menu works more efficiently. It is also worth checking for system updates, as newer versions of firmware often fix power errors.
Hidden MIUI settings to reduce heating
Turn off automatic app updates in the Play Market, leaving this feature only for Wi-Fi. Background download and install updates put a strain on the processor and Wi-Fi module, causing additional heat.
Radical measures and resetting settings
When software methods fail, the last resort is a factory reset, which removes all data, applications and settings, bringing the phone back out of the box. Often, it's the accumulated software debris that causes it to lag and heat.
Before the procedure, make sure to back up important contacts and photos. Reset can be done through the settings menu or through Recovery mode. After the reset, do not install all applications at once, but observe the behavior of the system in a “clean” form.
- 🔄 Reset eliminates system file conflicts that have arisen after failed updates.
- 📉 The temperature of the processor after reset usually returns to factory values.
- ⚙️ Do not restore the backup of the system completely, it is better to set up the phone as new.
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Hard Reset is a way to eliminate the software cause of overheating, and if the phone warms up after reset and without third-party apps installed, the hardware is the problem.
When repairs are needed in the service center
There are situations where self-treatment is useless. If the Redmi Note 4 is warming even when it is turned off when connecting to a charge, or if the heating is accompanied by spontaneous reboots and shutdowns, a specialist will need to be diagnosed.
A common hardware problem is the processor or memory dump due to constant thermal expansion and compression of the board (especially for versions on Snapdragon), and the power controller may have failed, in which cases, resolding of components or replacing the motherboard is required.
Don't try to change your battery yourself if you don't have the experience and tools. Installation of a new battery or damage to the plume can lead to fire.